CN119275582B

CN119275582B - Dual-band antenna and communication device

Info

Publication number: CN119275582B
Application number: CN202310840868.1A
Authority: CN
Inventors: 刘杰; 李孜; 许迎军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2025-11-07
Anticipated expiration: 2043-07-07
Also published as: CN119275582A

Abstract

This application provides a dual-band antenna and a communication device. The dual-band antenna includes: a feed unit, a circuit board, and a first radiating element, a second radiating element, a third radiating element, and a transmission line disposed on a first surface of the circuit board. The first radiating element, the second radiating element, and the third radiating element are arranged sequentially along a first direction on the first surface and connected in series through the transmission line. The first radiating element is also connected to the feed unit through the transmission line. The feed unit is used to transmit or receive signals through the transmission line. The first radiating element includes: a first high-frequency vibrator and a first low-frequency vibrator connected in parallel. The second radiating element includes: a second high-frequency vibrator. The third radiating element includes: a third high-frequency vibrator and a second low-frequency vibrator connected in parallel. The operating frequency band of the first high-frequency vibrator, the second high-frequency vibrator, and the third high-frequency vibrator is a first frequency band, and the operating frequency band of the first low-frequency vibrator and the second low-frequency vibrator is a second frequency band.

Description

Dual-band antenna and communication device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a dual-frequency antenna and communication equipment.

Background

Wireless fidelity (WIRELESS FIDELITY, wi-Fi) technology has inherently low cost advantages over mobile networks as a use of unlicensed radio spectrum. As the signal rate of Wi-Fi increases and becomes popular, the number of applications of Wi-Fi devices is increasing.

With the increasing demand for Wi-Fi signal rate, the transmission rate of the antenna 2.4G frequency band cannot meet the market demand. Therefore, a dual-band antenna combining the 2.4G frequency band and the 5G frequency band is popularized. The dual-frequency antenna comprises a low-frequency oscillator for transmitting 2.4G signals and a high-frequency oscillator for transmitting 5G signals.

On the premise of keeping the whole size unchanged, how to control the number of antennas becomes more and more important, as in the dual-frequency double-fed antenna shown in fig. 1, the high-frequency oscillator 30 and the low-frequency oscillator 20 are respectively located on the front side and the back side of the circuit board 10 and are arranged back to back, and are both series-fed array antennas, and the radiating units are connected through coaxial cables to realize high gain, horizontal coverage, and 2 feed ports are independent. However, the circuit board needs welding cables, has many and dense welding spots, is easy to short, has complex process and higher cost.

Disclosure of Invention

The embodiment of the application provides a dual-frequency antenna and communication equipment, which solve the problems of multiple welding spots, easy short circuit, complex process and high cost of the dual-frequency dual-feed antenna.

In order to achieve the above purpose, the application adopts the following technical scheme:

The dual-frequency antenna comprises a circuit board, a first radiating element, a second radiating element, a third radiating element, a transmission line and a feed unit, wherein the circuit board comprises a first surface and a second surface which are opposite to each other, the first radiating element, the second radiating element and the third radiating element are sequentially arranged on the first surface along a first direction, the first radiating element, the second radiating element and the third radiating element are connected in series through the transmission line, the first radiating element is further connected with the feed unit through the transmission line, the feed unit is used for transmitting or receiving signals through the transmission line, the first radiating element comprises a first high-frequency oscillator and a first low-frequency oscillator which are connected in parallel, the second radiating element comprises a second high-frequency oscillator and a second low-frequency oscillator which are connected in parallel, the working frequency ranges of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are first frequency ranges, and the working frequency ranges of the first low-frequency oscillator and the second low-frequency oscillator are second frequency ranges. Therefore, the plurality of radiating units are arranged on the same surface of the circuit board, and in some radiating units, such as the first radiating unit and the third radiating unit, the high-frequency oscillator and the low-frequency oscillator can be connected in parallel, so that space is saved, only single-sided wire-bonding is needed, wire-bonding difficulty is reduced, manufacturing process is simplified, and production cost is reduced. In addition, only one transmission line is needed, the feeding unit and the plurality of radiating units can be connected in series, welding spots are reduced, and short circuit risks are reduced.

In an alternative implementation, the first radiating element, the second radiating element, and the third radiating element are all in a central symmetrical structure or an axisymmetrical structure. Therefore, the first radiation unit, the second radiation unit and the third radiation unit adopt a central symmetrical structure or an axial symmetrical structure, so that the oscillator arms of each oscillator are symmetrically arranged, the symmetry axis of each oscillator passes through the center between the oscillator arms, the center is the center of the radiation unit, and the oscillator of the dual-frequency antenna can be a dipole oscillator.

In an alternative implementation manner, the first low-frequency oscillator comprises a first low-frequency oscillator arm and a second low-frequency oscillator arm which are arranged along the first direction, the first high-frequency oscillator comprises a first high-frequency oscillator arm and a second high-frequency oscillator arm which are arranged along the first direction, the first low-frequency oscillator arm is connected in parallel with the first high-frequency oscillator arm, the second low-frequency oscillator arm is connected in parallel with the second low-frequency oscillator arm, the second high-frequency oscillator comprises a third high-frequency oscillator arm and a fourth high-frequency oscillator arm which are arranged along the first direction, the second low-frequency oscillator comprises a third low-frequency oscillator arm and a fourth low-frequency oscillator arm which are arranged along the first direction, the third high-frequency oscillator comprises a fifth high-frequency oscillator arm and a sixth high-frequency oscillator arm which are arranged along the first direction, the third low-frequency oscillator arm is connected in parallel with the fifth high-frequency oscillator arm, and the fourth low-frequency oscillator arm is connected in parallel with the sixth high-frequency oscillator arm. Therefore, the first radiation unit, the second radiation unit and the third radiation unit are dipole radiation units, and the first high-frequency oscillator, the second high-frequency oscillator, the third high-frequency oscillator, the first low-frequency oscillator and the second low-frequency oscillator are dipole oscillators.

In an alternative implementation manner, the vibrator arms are of a U-shaped structure, wherein two vibrator arms connected in parallel share the bottom edge of the U-shaped structure, the opening directions of the two vibrator arms connected in parallel are the same, and the opening directions of the two vibrator arms in the same vibrator are opposite. Therefore, the vibrator arms adopt a U-shaped structure, and the two parallel vibrator arms share the bottom edge of the U-shaped structure, so that the space occupied by the parallel vibrator can be reduced, the space is saved, and compared with the wiring of the single-frequency vibrator, the wiring is not required to be additionally increased, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

In an alternative implementation, the length l ₁ of the oscillator arms of the first low-frequency oscillator and the second low-frequency oscillator satisfies: Wherein lambda ₁ is the wavelength of the electromagnetic wave in the first frequency band, A ₁ is the error threshold, and the lengths l ₂ of the oscillator arms of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator satisfy the following conditions: Wherein lambda ₂ is the wavelength of the electromagnetic wave in the first frequency band, and A2 is the error threshold. Therefore, the physical length corresponding to the electrical length of the first low-frequency oscillator and the second low-frequency oscillator is close to one fourth of the wavelength of the first frequency band, and electromagnetic waves with the frequency in the first frequency band can be transmitted or received. The physical lengths of the first high-frequency oscillator, the second high-frequency oscillator and the oscillator arms of the third high-frequency oscillator are close to one fourth of the wavelength of the second frequency band, and electromagnetic waves with the frequency in the second frequency band can be transmitted or received.

In an alternative implementation manner, the distance D between the first low-frequency vibrator and the second low-frequency vibrator satisfies the condition that D-lambda ₁|≤A₃, wherein lambda ₁ is the wavelength of the electromagnetic wave in the first frequency band, A ₃ is an error threshold, the distance between the first high-frequency vibrator and the second high-frequency vibrator, and the distance D between the second high-frequency vibrator and the third high-frequency vibrator satisfies the condition that D-lambda ₂|≤A₄, wherein lambda ₂ is the wavelength of the electromagnetic wave in the second frequency band, and A ₄ is the error threshold. Therefore, the distance between the adjacent low-frequency vibrators is close to the wavelength of the single first frequency band, the distance between the adjacent high-frequency vibrators is close to the wavelength of the single second frequency band, and the gain of the double-frequency series-fed multiple dipole array antennas in the horizontal plane can be improved.

In an alternative implementation, the first radiating element includes a coupling stub, the second radiating element includes a ground point, the third radiating element includes a feed point, the transmission line includes a first sub-transmission line, a second sub-transmission line, and a third sub-transmission line, the coupling stub is coupled to the first sub-transmission line, the feed point is connected to the second sub-transmission line, and the ground point is connected to the third sub-transmission line. The coupling branch of the first radiating element is coupled with the first sub-transmission line, the first sub-transmission line can feed the first radiating element in a coupling mode, the second sub-transmission line can directly feed the third radiating element, the grounding point of the second radiating element is connected with the third sub-transmission line, the feeding point of the second radiating element is connected with the third sub-transmission line, and the second radiating element can be grounded through the third sub-transmission line, so that the first radiating element is coupled and fed through the transmission line, the third radiating element directly feeds signals and the second radiating element feeds through ground current, and the high-frequency gain is improved while the low frequency is considered.

In an alternative implementation, the first low frequency oscillator arm and the first high frequency oscillator arm are coupled to the first sub-transmission line, and the fourth low frequency oscillator arm and the sixth high frequency oscillator arm are connected to the second sub-transmission line. Thus, the first sub-transmission line is coupled to feed the first low-frequency oscillator arm and the first high-frequency oscillator arm in a coupling manner, and the second sub-transmission line is directly fed to the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm.

In an alternative implementation manner, the coupling branch is U-shaped, openings are formed in the bottom edges of the first high-frequency oscillator arm and the first low-frequency oscillator arm, two ends of the coupling branch are respectively connected with two ends of the opening, and the coupling branch is arranged around the first sub-transmission line. Therefore, the coupling size of the coupling branch and the first sub-transmission line is larger, and the coupling effect of the coupling branch and the first sub-transmission line is improved.

In an alternative implementation, the first sub-transmission line and the second sub-transmission line are a first type of transmission line, the first type of transmission line including an inner conductor. Thus, the first type of transmission line may feed the radiating element directly.

In an alternative implementation, the first type of transmission line further includes an insulating layer between the inner conductor and the circuit board. Thus, by providing the insulating layer, the inner conductor and the circuit board can be separated.

In an alternative implementation, the first type of transmission line further includes a conductive sheet disposed on a side of the insulating layer away from the circuit board, the conductive sheet being connected to the inner conductor. Thus, by providing the conductive sheet, the manufacturing process of the cable can be simplified, and the impedance can be adjusted more flexibly.

In an alternative implementation, the third sub-transmission line is a second type transmission line, and the second type transmission line includes an inner conductor, an outer conductor, and a dielectric layer, where the inner conductor and the outer conductor are coaxial, and the dielectric layer is located between the inner conductor and the outer conductor. Thus, the outer conductor of the second type transmission line is in contact with the circuit board, and grounding can be achieved.

In an alternative implementation, the first radiating element, the second radiating element and the third radiating element are connected by the third sub-transmission line.

In an alternative implementation manner, the transmission line further comprises a fourth sub-transmission line, the first radiating element is connected with the feeding unit through the fourth sub-transmission line, and the fourth sub-transmission line is the second type transmission line. Thus, the second type of transmission line may be used to connect the feed element and the plurality of antenna elements.

In an alternative implementation manner, the transmission line further comprises a fifth sub-transmission line, a sixth sub-transmission line and a seventh sub-transmission line, the fourth sub-transmission line is connected with the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line is connected with the third sub-transmission line through the sixth sub-transmission line, the third sub-transmission line is connected with the second sub-transmission line through the seventh sub-transmission line, wherein the fifth sub-transmission line, the sixth sub-transmission line and the seventh sub-transmission line are third type transmission lines, and the third type transmission line comprises an inner conductor and a dielectric layer, the inner conductor and the dielectric layer are coaxial, and the dielectric layer is located outside the inner conductor. Thus, the third type of transmission line may be used to connect the first type of transmission and the second type of transmission line. The cross section sizes of the first type transmission line, the third type transmission line and the second type transmission line are sequentially increased, and the transition between the first type transmission line and the second type transmission line is more gentle and consistent by arranging the third type transmission line, so that the stability of signal transmission is improved.

In an alternative implementation, the first frequency band is a 2.4GHz frequency band, and the second frequency band is a 5GHz frequency band. Therefore, the dual-frequency antenna comprises 2 low-frequency vibrators working in the 2.4GHz frequency band and 3 high-frequency vibrators working in the 5GHz frequency band, and can work in the first frequency band and the second frequency band at the same time, so that the combined gain is improved.

In a second aspect, a communication device is provided, comprising a housing, a control circuit and a dual-frequency antenna as described above, the control circuit and the dual-frequency antenna being arranged in the housing, the control circuit and the dual-frequency antenna being electrically connected. Therefore, the communication equipment adopts the dual-frequency antenna, realizes high gain, saves more space, has low wiring difficulty and reduces production cost.

In an alternative implementation, the communication device is a router. Therefore, the dual-frequency antenna can be used in a router, and the communication effect is improved.

The application provides a dual-frequency antenna and communication equipment, wherein the dual-frequency antenna comprises a feed unit, a circuit board, a first radiation unit, a second radiation unit, a third radiation unit and a transmission line, wherein the first radiation unit, the second radiation unit, the third radiation unit and the transmission line are arranged on the first surface of the circuit board, the first radiation unit, the second radiation unit and the third radiation unit are sequentially arranged on the first surface along a first direction and are connected in series through the transmission line, the first radiation unit is also connected with the feed unit through the transmission line, and the feed unit is used for transmitting or receiving signals through the transmission line. The plurality of radiating units are arranged on the same surface of the circuit board, and only single-sided wiring welding is needed, so that wiring difficulty is reduced, manufacturing process is simplified, and production cost is reduced. The first radiation unit comprises a first high-frequency oscillator and a first low-frequency oscillator which are connected in parallel, the second radiation unit comprises a second high-frequency oscillator, the third radiation unit comprises a third high-frequency oscillator and a second low-frequency oscillator which are connected in parallel, the working frequency ranges of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are first frequency ranges, and the working frequency ranges of the first low-frequency oscillator and the second low-frequency oscillator are second frequency ranges. Therefore, in the first radiation unit and the third radiation unit, the high-frequency oscillator and the low-frequency oscillator are connected in parallel, so that space is saved. In addition, only one transmission line is needed, the feeding unit and the plurality of radiating units can be connected in series, welding spots are reduced, and short circuit risks are reduced.

Drawings

Fig. 1 is a schematic structural diagram of a dual-frequency dual-feed antenna;

Fig. 2 is a schematic structural diagram of a first surface of the dual-frequency dual-feed antenna of fig. 1;

FIG. 3 is a schematic diagram of a second surface of the dual-band dual-feed antenna of FIG. 1;

Fig. 4 is a schematic structural diagram of a side surface of a dual-frequency antenna according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a first surface of a first dual-band antenna according to an embodiment of the present application;

FIG. 6 is a schematic diagram of the first radiating element of FIG. 4;

FIG. 7 is a schematic diagram of the second radiating element of FIG. 4;

FIG. 8 is a schematic diagram of the third radiating element of FIG. 4;

fig. 9 is a schematic structural diagram of a first type of transmission line according to an embodiment of the present application;

Fig. 10 is a schematic structural diagram of a second type transmission line according to an embodiment of the present application;

fig. 11 is a cross-sectional view of a second type of transmission line according to an embodiment of the present application;

Fig. 12 is a schematic structural diagram of a third type of transmission line according to an embodiment of the present application;

Fig. 13 is a cross-sectional view of a third type of transmission line provided by an embodiment of the present application;

fig. 14 is a schematic structural diagram of a first surface of a second dual-band antenna according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a first surface of a third dual-band antenna according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a first surface of a fourth dual-band antenna according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a first surface of a fifth dual-band antenna according to an embodiment of the present application

Fig. 18 is a schematic diagram of a radiation pattern of a dual-band antenna in a first frequency band according to an embodiment of the present application;

fig. 19 is a schematic diagram of a radiation pattern of a dual-band antenna in a second frequency band according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in the present application, directional terms "upper", "lower", etc. are defined with respect to the orientation in which the components are schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for description and clarity with respect thereto, and which may be changed accordingly in accordance with the change in the orientation in which the components are disposed in the drawings.

Hereinafter, terms that may appear in the embodiments of the present application will be explained.

The dipole antenna is composed of a pair of symmetrically placed conductors, and two ends of the conductors, which are close to each other, are respectively connected with a feeder line. When used as a transmitting antenna, the electrical signal is fed into the conductor from the antenna center, and when used as a receiving antenna, the receiving signal is also obtained from the conductor at the antenna center.

A transmission line refers to a connection line between the transceiver of the antenna and the radiator. The transmission line may directly transmit current waves or electromagnetic waves depending on frequency and form. The connection to the transmission line on the radiator is often referred to as the feed point. The transmission line includes a wire transmission line, a coaxial line transmission line, a waveguide, a microstrip line, or the like. The transmission line may include a bracket antenna body, a glass antenna body, or the like, depending on the implementation. The transmission line may be implemented by LCP (Liquid Crystal Polymer, liquid crystal polymer material), FPC (Flexible Printed Circuit, flexible printed circuit board), PCB (Printed Circuit Board ), or the like, depending on the carrier.

Ground/floor "may refer broadly to at least a portion of any ground layer, or ground plate, or ground metal layer, etc., within a communication device, or at least a portion of any combination of any of the above ground layers, or ground plates, or ground components, etc., and may be used to ground components within a communication device. In one embodiment, the circuit board may be a printed circuit board (printed circuit board, PCB), such as an 8-, 10-, 13-, or 12-14 layer board with 8, 10-, 12-, 13-, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric or insulating layer such as fiberglass, polymer, or the like. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, the trace layer and the ground layer being electrically connected by vias.

Any of the above ground layers, or ground plates, or ground metal layers are made of conductive materials. In one embodiment, the conductive material may be any one of copper, aluminum, stainless steel, brass, and alloys thereof, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver plated copper foil on an insulating substrate, silver foil on an insulating substrate and tin plated copper, cloth impregnated with graphite powder, a graphite coated substrate, a copper plated substrate, a brass plated substrate, and an aluminized substrate. Those skilled in the art will appreciate that the ground layer/plate/metal layer may be made of other conductive materials.

Connection/association may refer to a mechanical connection or a physical connection, i.e., connection of a to B or connection of a to B may refer to the presence of a fastening member (e.g., screw, bolt, rivet, etc.) between a and B, or the contact of a and B with each other and the difficulty of separation of a and B.

Coupled, may be understood as directly coupled and/or indirectly coupled, and "coupled connection" may be understood as directly coupled connection and/or indirectly coupled connection. The direct coupling may be referred to as "electrical connection" or "indirect coupling" which is understood to mean that the components are in physical contact and electrically conductive, or may be understood to mean that different components in the circuit configuration are connected by a physical circuit capable of transmitting an electrical signal, such as a copper foil or a wire of a printed circuit board (printed circuit board, PCB), and the two conductors are electrically conductive in a spaced/non-contact manner. In one embodiment, the indirect coupling may also be referred to as capacitive coupling, such as by coupling between a gap between two conductive elements to form an equivalent capacitance to effect signal transmission.

The electric connection or the indirect coupling is used for conducting or communicating two or more components so as to carry out signal/energy transmission.

Fig. 1 is a schematic side view of a dual-band dual-feed antenna, as shown in fig. 1, the dual-band dual-feed antenna includes a printed circuit board (printed circuit board, PCB) 10, and the printed circuit board 10 includes a first surface 11 and a second surface 12 facing away from each other. The first surface 11 is provided with at least two low frequency oscillators 20 and the second surface 12 is provided with at least three high frequency oscillators 30. The at least two low-frequency oscillators 20 are sequentially arranged on the first surface 11 along a first direction y, and the at least three high-frequency oscillators 30 are sequentially arranged on the second surface 12 along the first direction y, where the first direction y may be an extending direction of the antenna. That is, both side surfaces of the printed circuit board 10 of the dual-frequency double-fed antenna are provided with the low-frequency vibrator 20 and the high-frequency vibrator 30, respectively.

The printed circuit board 10 may be a flame resistant material (FR-4) dielectric board, a Rogers (Rogers) dielectric board, a hybrid Rogers and FR-4 dielectric board, or the like. Here, FR-4 is a code of a flame resistant material grade, and the Rogers dielectric board is a high frequency board. The printed circuit board 10 carries electronic components, such as radio frequency chips and the like.

In one embodiment, a metal layer may be provided on the printed circuit board 10. The metal layer may be used for grounding electronic components carried on the printed circuit board 10, and may also be used for grounding other components, such as bracket antennas, frame antennas, etc., and may be referred to as a ground plate, or ground plane. In one embodiment, the metal layer may be formed by etching metal on the surface of any one of the dielectric plates in the printed circuit board 10. In one embodiment, the edge of the printed circuit board 10 may be considered the edge of its ground plane.

Fig. 2 is a schematic structural diagram of a first surface of the dual-band dual-feed antenna in fig. 1, and as shown in fig. 1 and 2, the first surface 11 of the printed circuit board 10 sequentially includes a first low-frequency dipole element 21 and a second low-frequency dipole element 22 along a first direction y, where n is a positive integer at least 2. The adjacent low frequency dipole 20 is electrically connected by the first transmission line 1, i.e. the first low frequency dipole 21 is electrically connected to the second low frequency dipole 22 by the first transmission line 1, and the n-1 low frequency dipole is electrically connected to the n-th low frequency dipole by the other first transmission line 1. All the low frequency oscillators 20 are connected in sequence, and the adjacent low frequency oscillators 20 are electrically connected through a first transmission line 1. Specifically, when the antenna includes n low frequency oscillators 20, n-1 first transmission lines 1 are included. The first low-frequency dipole element 21 is located at the feed end, and the first low-frequency dipole element 21 is electrically connected to the first feeder line 3, and specifically, the first transmission line 1 is electrically connected to the first feeder line 3 through the first low-frequency dipole element 21, so as to realize signal transmission.

Fig. 3 is a schematic structural view of a second surface of the dual-band dual-feed antenna in fig. 1, and as shown in fig. 1 and 3, the second surface 12 of the printed circuit board 10 sequentially includes a first high-frequency dipole element 31, a second high-frequency dipole element 32, and a third high-frequency dipole element 33 in the first direction y. The adjacent high-frequency dipole elements 30 are electrically connected through the second transmission line 2, that is, the first high-frequency dipole element 31 and the second high-frequency dipole element 32 are electrically connected through the second transmission line 2, and the m-1 high-frequency dipole element and the m-th high-frequency dipole element are electrically connected through the other second transmission line 2. All the high-frequency oscillators 30 are connected in sequence, and adjacent high-frequency oscillators 30 are electrically connected through one second transmission line 2. Specifically, when the antenna includes m high-frequency dipole elements 2, m-1 second transmission lines 2 are included. The first high-frequency dipole element 31 is located at the feed end, one end of the first high-frequency dipole element 31 is electrically connected to the second transmission line 2, and the other end of the first high-frequency dipole element is electrically connected to the second feeder line 4, and specifically, the second feeder line 4 is electrically connected to the second transmission line 2 through the first high-frequency dipole element 31, so as to realize signal transmission.

The high-frequency antenna and the low-frequency antenna of the double-frequency double-feed antenna are respectively positioned on the front side and the back side of the circuit board and are arranged back to back, the two antennas are series feed array antennas, the radiating units are connected through coaxial cables, high gain is achieved, horizontal coverage is achieved, and 2 feed ports are independent. However, the circuit board needs welding cables, has many and dense welding spots, is easy to short, has complex process and higher cost.

To this end, embodiments of the present application provide an improved antenna.

Fig. 4 is a schematic structural diagram of a side surface of a dual-band antenna according to an embodiment of the present application. As shown in fig. 4, the dual-band dual-feed antenna comprises a printed circuit board 10, the printed circuit board 10 comprising a first surface 11 and a second surface 12 facing away from each other. Three radiating elements 200, a first radiating element 201, a second radiating element 202 and a third radiating element 203 are provided on the first surface 11. The three radiation units 200 are sequentially arranged on the first surface 11 along the first direction y.

Adjacent radiating elements are electrically connected by a transmission line 300, i.e. the first radiating element 201 is electrically connected to the second radiating element 202 by a transmission line 300, and the n-1 radiating element is electrically connected to the n-th radiating element by another transmission line 300. All the radiating elements are connected in sequence, and adjacent radiating elements are electrically connected by a transmission line 300. Specifically, when the antenna includes n radiating elements, then n-1 transmission lines 300 are included. The first radiation unit 201 is located at the feed end, and the first radiation unit 201 is electrically connected with the feed unit through a transmission line, so as to realize signal transmission.

The feed unit is a combination of all components of the antenna for the purpose of reception and transmission of radio frequency waves. In the case of a receiving antenna, the feed unit may be considered as the antenna part from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed unit may be regarded as a part after the last power amplifier. In some cases, the term "feed unit" is understood in a narrow sense to mean a radio frequency chip or a transmission path comprising the radio frequency chip to a feed point on a radiator or transmission line. The feeding unit has a function of converting radio waves into electric signals and transmitting them to the receiver assembly. In general, it is considered to be part of an antenna for converting radio waves into electrical signals and vice versa. The antenna design should take into account the maximum power transmission possibilities and efficiency. For this purpose, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance and inductance. To ensure maximum power transfer conditions, the two impedances (load resistance and feed impedance) should be matched. Matching may be accomplished by considering frequency requirements and design parameters of the antenna (e.g., gain, directivity, and radiation efficiency).

Fig. 5 is a schematic structural diagram of a first surface of a dual-band antenna according to an embodiment of the present application. As shown in fig. 5, the first radiating element 201 includes a first high frequency oscillator 2011 and a first low frequency oscillator 2012 connected in parallel. The second radiating element includes a second high frequency vibrator 2021. The third radiating element includes a third high-frequency vibrator 2031 and a second low-frequency vibrator 2032 connected in parallel;

In some embodiments, the operating frequency band of the first low frequency oscillator 2012 and the second low frequency oscillator 2032 is a first frequency band, and the operating frequency band of the first high frequency oscillator 2011, the second high frequency oscillator 2021, and the third high frequency oscillator 2031 is a second frequency band. Wherein the lowest frequency of the first frequency band is higher than the highest frequency of the second frequency band. The first frequency band is, for example, a 2.4GHz frequency band and the second frequency band is a 5GHz frequency band.

In some embodiments, the dimensions of the first surface 11 of the circuit board in the y direction are 132mm and 13mm in the x direction, and the overall dimensions are smaller, which is advantageous for reducing the overall dimensions.

The dual-frequency antenna provided by the application comprises 2 low-frequency vibrators working in the 2.4GHz frequency band and 3 high-frequency vibrators working in the 5GHz frequency band, so that the combination gain is improved.

According to the dual-frequency antenna provided by the application, the plurality of radiating units are arranged on the same surface of the circuit board, and in some radiating units, the high-frequency oscillator and the low-frequency oscillator can be connected in parallel, so that the space is saved, only single-sided wire bonding is needed, the wire bonding difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

In addition, only one transmission line 300 is needed to connect the feeding unit and the plurality of radiating units in series, so that welding spots are reduced, and short circuit risk is reduced.

In some embodiments, the center of the first high frequency oscillator 2011 coincides with the center of the first low frequency oscillator 2012, and the center of the third high frequency oscillator 2031 coincides with the center of the second low frequency oscillator 2032.

The structure of the dual-band antenna of the present application will be described with reference to fig. 5 to 8.

In some embodiments, the first radiating element 201, the second radiating element 202, and the third radiating element 203 adopt a central symmetrical structure or an axial symmetrical structure, so that the dipole arms in each radiating element are symmetrically arranged, and the symmetry axis thereof passes through the center between the dipole arms, and the center is the center of the radiating element, so that the dipole of the dual-frequency antenna can be a dipole.

In some embodiments, the first high frequency oscillator 2011 and the first low frequency oscillator 2012 are both dipole oscillators. As shown in fig. 5, the first radiating element 201 includes a first high frequency oscillator 2011 and a first low frequency oscillator 2012 connected in parallel.

The structure of the first radiation element 201 in fig. 5 is further described below with reference to fig. 6. As shown in fig. 6, the first high-frequency vibrator includes a first high-frequency vibrator arm 2011a and a second high-frequency vibrator arm 2011b arranged in a first direction.

The first low frequency dipole resonator includes a first low frequency dipole arm 2012a and a second low frequency dipole arm 2012b arranged along a first direction.

The first high-frequency oscillator arm 2011a and the first low-frequency oscillator arm 2012a are connected in parallel, and the second high-frequency oscillator arm 2011b and the second low-frequency oscillator arm 2012b are connected in parallel.

The first high-frequency oscillator arm 2011a and the first low-frequency oscillator arm 2012a are both in a U-shaped structure, and the opening directions are the same, and the first high-frequency oscillator arm 2011a and the first low-frequency oscillator arm 2012a share the bottom edge of the U-shaped structure.

The second high-frequency oscillator arm 2011b and the second low-frequency oscillator arm 2012b are both in a U-shaped structure, and the opening directions are the same, and the second high-frequency oscillator arm 2011b and the second low-frequency oscillator arm 2012b share the bottom edge of the U-shaped structure.

The opening directions of the first high-frequency oscillator arm 2011a and the second high-frequency oscillator arm 2011b are opposite, and as shown in fig. 6, the opening direction of the first high-frequency oscillator arm 2011a is in the +y direction, and the opening direction of the second high-frequency oscillator arm 2011b is in the-y direction.

The opening directions of the first low-frequency oscillator arm 2012a and the second low-frequency oscillator arm 2012b are opposite, and as shown in fig. 6, the opening direction of the first low-frequency oscillator arm 2012a is the +y direction, and the opening direction of the second low-frequency oscillator arm 2012b is the-y direction.

Therefore, the vibrator arms adopt a U-shaped structure, and the two parallel vibrator arms share the bottom edge of the U-shaped structure, so that the space occupied by the parallel vibrator can be reduced, the space is saved, and compared with the wiring of the single-frequency vibrator, the wiring is not required to be additionally increased, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

Referring next to fig. 5, the second radiating element 202 includes a second high frequency vibrator 2021.

In some embodiments, the second radiating element is a dipole radiating element, wherein the second high frequency vibrator 2021 is a dipole vibrator. As shown in fig. 5, the second radiating unit 202 includes a second high-frequency vibrator 2021.

The structure of the second radiating element 202 in fig. 5 is further described below in connection with fig. 7. As shown in fig. 7, the second high-frequency vibrator 2021 includes a third high-frequency vibrator arm 2021a and a fourth high-frequency vibrator arm 2021b arranged along the first direction.

The third high-frequency oscillator arm 2021a and the fourth high-frequency oscillator arm 2021b are both U-shaped, and the opening directions are opposite, the opening direction of the third high-frequency oscillator arm 2021a is in the +y direction, and the opening direction of the fourth high-frequency oscillator arm 2021b is in the-y direction.

The third radiating element 203 includes a third high frequency vibrator 2031 and a second low frequency vibrator 2032 connected in parallel.

In some embodiments, the third radiating element 203 is a dipole antenna, wherein the third high frequency element 2031 and the second low frequency element 2032 are both dipole elements. As shown in fig. 5, the third radiating unit 203 includes a third high-frequency vibrator 2031 and a second low-frequency vibrator 2032 connected in parallel.

The structure of the third radiating element 203 in fig. 5 is further described below with reference to fig. 8. As shown in fig. 8, the second low-frequency vibrator 2032 includes a third low-frequency vibrator arm 2032a and a fourth low-frequency vibrator arm 2032b arranged along the first direction.

The third high-frequency vibrator 2031 includes a fifth high-frequency vibrator arm 2031a and a sixth high-frequency vibrator arm 2031b arranged along the first direction.

The third low frequency dipole arm 2032a and the fifth high frequency dipole arm 2031a are connected in parallel, and the fourth low frequency dipole arm 2032b and the sixth high frequency dipole arm 2031b are connected in parallel.

The third low-frequency dipole arm 2032a and the fifth high-frequency dipole arm 2031a are both in a U-shaped structure, and have the same opening direction, and the third low-frequency dipole arm 2032a and the fifth high-frequency dipole arm 2031a share the bottom edge of the U-shaped structure.

The fourth low-frequency dipole arm 2032b and the sixth high-frequency dipole arm 2031b are both in a U-shaped structure, and have the same opening direction, and the fourth low-frequency dipole arm 2032b and the sixth high-frequency dipole arm 2031b share the bottom edge of the "U" shape structure.

The opening directions of the third low-frequency dipole arm 2032a and the fourth low-frequency dipole arm 2032b are opposite, and as shown in fig. 6, the opening direction of the third low-frequency dipole arm 2032a is in the +y direction, and the opening direction of the fourth low-frequency dipole arm 2032b is in the-y direction.

The opening directions of the fifth high-frequency oscillator arm 2031a and the sixth high-frequency oscillator arm 2031b are opposite, and as shown in fig. 6, the opening direction of the fifth high-frequency oscillator arm 2031a is the +y direction, and the opening direction of the sixth high-frequency oscillator arm 2031b is the-y direction.

The oscillator arms adopt a U-shaped structure, and the two oscillator arms connected in parallel share the bottom edge of the U-shaped structure, so that the space occupied by the parallel oscillators can be reduced, the space is saved, and compared with the wiring of the single-frequency oscillators, the wiring is not required to be additionally increased, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

In some embodiments of the present application, the length l ₁ of the dipole arms of the first low-frequency dipole 2012 and the second low-frequency dipole 2032 satisfies: Wherein lambda ₁ is the wavelength of the electromagnetic wave in the first frequency band, and A ₁ is the error threshold. In some embodiments, A ₁ is about

Thus, the physical length corresponding to the electrical length of the first low frequency oscillator 2012 and the second low frequency oscillator 2032 is close to one fourth of the wavelength of the first frequency band, i.e. electromagnetic waves with frequencies in the first frequency band can be emitted or received.

In some embodiments of the present application, the lengths l ₂ of the vibrator arms of the first high-frequency vibrator 2011, the second high-frequency vibrator 2021, and the third high-frequency vibrator 2031 satisfy: wherein lambda ₂ is the wavelength of the electromagnetic wave in the first frequency band, and A ₂ is the error threshold. In some embodiments, A ₂ is about

Thus, the physical lengths of the first high-frequency vibrator 2011, the second high-frequency vibrator 2021, and the third high-frequency vibrator 2031 corresponding to the vibrator arms are close to a quarter of the wavelength of the second frequency band, that is, electromagnetic waves having frequencies in the second frequency band can be emitted or received.

In some embodiments of the present application, the distance d between the first low frequency oscillator 2012 and the second low frequency oscillator 2032 satisfies |d- λ ₁|≤A₃, where λ ₁ is the wavelength of the electromagnetic wave of the first frequency band, and a ₃ is the error threshold. In some embodiments, A ₃ is about

In some embodiments of the present application, the spacing between the first high frequency vibrator 2011 and the second high frequency vibrator 2021, and the spacing D between the second high frequency vibrator 2021 and the third high frequency vibrator 2031 satisfy |d- λ ₂|≤A₄, where λ ₂ is the wavelength of the second frequency band electromagnetic wave, and a ₄ is the error threshold. In some embodiments, A ₄ is about

Therefore, the distance between the adjacent low-frequency vibrators is close to the wavelength of the single first frequency band, the distance between the adjacent high-frequency vibrators is close to the wavelength of the single second frequency band, and the gain of the double-frequency series-fed multiple dipole array antennas in the horizontal plane can be improved.

The structure of the transmission line 300 is described below with reference to fig. 5 to 13.

In some embodiments, as shown in FIG. 5, the first radiating element 201 includes a coupling stub 2013, the second radiating element 202 includes a ground point, the third radiating element 203 includes a feed point, the transmission line 300 includes a first sub-transmission line 301, a second sub-transmission line 302, and a third sub-transmission line 303, the coupling stub 2013 is coupled to the first sub-transmission line 301, the feed point is connected to the second sub-transmission line 302, and the ground point is connected to the third sub-transmission 303.

In other embodiments, as shown in FIG. 5, the transmission line 300 further includes a fourth sub-transmission line 304, a fifth sub-transmission line 305, a sixth sub-transmission line 306, and a seventh sub-transmission line 307.

In some embodiments, the first sub-transmission line 301 and the second sub-transmission line 302 are first type transmission lines. The structure of the first type of transmission line in fig. 5 is described below with reference to fig. 9. As shown in fig. 9, the first type transmission line 31 includes a first inner conductor 31a.

In some embodiments, the first type of transmission line 31 may be formed by a coaxial cable loop-strip. The coaxial cable at least comprises an inner conductor, a dielectric layer and an outer conductor which are coaxially arranged, wherein the dielectric layer is positioned between the inner conductor and the outer conductor, and the outer conductor and the dielectric layer can be removed in a girdling mode to obtain the first inner conductor 31a.

In some embodiments, the first type transmission line 31 further includes an insulating layer 31b, the insulating layer 31b being located between the second inner conductor 3021a and the circuit board. Thus, by providing the insulating layer 31b, the second inner conductor 3021b and the circuit board can be separated. In some embodiments, the insulating layer may be an insulating layer of a coaxial cable. The insulating layer can be made of polypropylene or polyethylene.

In some embodiments, the first type transmission line 31 further includes a conductive sheet 31c, the conductive sheet 31c being located on a side of the second inner conductor 3021a remote from the insulating layer 31b, the conductive sheet 31c being connected to the inner conductor 31 a.

In some embodiments, the width of the conductive sheet 31c is greater than the width of the inner conductor 31 a. Thus, by providing the conductive piece 31c, the conductor size of the inner conductor 31a can be increased, the manufacturing process of the cable can be simplified, and the impedance can be adjusted more flexibly.

In some embodiments, as shown in fig. 5, the vibrator arms of the radiating elements located at both ends of the circuit board are electrically connected to the first type of transmission line.

For example, the first sub-transmission line 301 is coupled to a vibrator of the first radiating element 201 remote from the second radiating element 202, i.e. the first low frequency vibrator arm 2012a and the first high frequency vibrator arm 2011a are coupled to the first sub-transmission line 301 as shown in fig. 6.

As shown in fig. 6, the first low frequency oscillator arm 2012a and the first high frequency oscillator arm 2011a further include a coupling stub 2013, the coupling stub 2013 being coupled to the first sub-transmission line 301. Thus, the first radiating element 201 may be fed by coupling through the first sub-transmission line 301.

The coupling branch 2013 is U-shaped, openings are formed on the U-shaped bottom edges of the first low-frequency oscillator arm 2012a and the first high-frequency oscillator arm 2011a, two ends of the coupling branch 2013 are respectively connected with two ends of the opening, and the coupling branch 2013 is disposed around the second sub-transmission line 302.

The direction of the U-shaped opening of the coupling branch 2013 is opposite to the direction of the U-shaped openings of the first low frequency oscillator arm 2012a and the first high frequency oscillator arm 2011 a.

In some embodiments, the second sub-transmission line 302 is electrically connected to a transducer of the third radiating element 203 that is far from the second radiating element 202, and as shown in fig. 8, the fourth low frequency transducer arm 2032b and the sixth high frequency transducer arm 2031b are electrically connected to the second sub-transmission line 302. Thereby, the third radiating element 203 may be directly fed through the second sub-transmission line 302.

In some embodiments, the third sub-transmission line 303, the fourth sub-transmission line 304 are a second type of transmission line.

The structure of the second type transmission line in fig. 5 will be described with reference to fig. 10 and 11. As shown in fig. 10 and 11, the second type transmission line 32 includes a second inner conductor 32a, an outer conductor 32b, and a first dielectric layer 32c. The second inner conductor 32a and the outer conductor 32b are coaxial, and the first dielectric layer 32c is located between the second inner conductor 32a and the outer conductor 32b, which outer conductor 32b is connected to the printed circuit board 10.

The first radiating element 201, the second radiating element 202 and the third radiating element 203 are connected by the third sub-transmission line 303.

The first radiating element 201 is connected to the feed element via the fourth sub-transmission line 304.

As shown in fig. 5, the first radiating element 201 is connected to the second radiating element 202 through the second sub-transmission line 302, and the second radiating element 202 is connected to the third radiating element 203 through the second sub-transmission line 302, and the first radiating element 201 is also connected to the feed port through the fourth sub-transmission line 304.

Thus, the second type of transmission line 32 may connect a radiating element with a feed port, and may also be used to connect a plurality of radiating elements.

As shown in fig. 5, the second radiation unit 202 is connected to the first sub-transmission line 301, and the outer conductor 32b of the first sub-transmission line 301 is connected to the printed circuit board 10, so that the outer conductor 32b is grounded, and an induced current is generated on the printed circuit board 10, and the second radiation unit 202 generates radiation under the effect of the induced current of the printed circuit board 10.

Optionally, to make the transition between the first type of transmission line 31 and the second type of transmission line 32 smoother and more consistent, the transmission line 300 further includes a fifth sub-transmission line 305, a sixth sub-transmission line 306, and a seventh sub-transmission line 307, as shown in fig. 5.

In some embodiments, the fifth sub-transmission line 305, the sixth sub-transmission line 306, and the seventh sub-transmission line 307 are a third type of transmission line.

The structure of the second type transmission line in fig. 5 will be described with reference to fig. 12 and 13. As shown in fig. 12 and 13, the third type transmission line 33 includes a third inner conductor 33a and a second dielectric layer 33b, the second inner conductor 31a and the second dielectric layer 33b are coaxial, and the second dielectric layer 33b is located outside the third inner conductor 33 a.

As shown in fig. 5, the fourth sub-transmission line 304 (second-type transmission line 32) is connected to the first sub-transmission line 301 (first-type transmission line 31) through the fifth sub-transmission line 305 (third-type transmission line 33), the first sub-transmission line 301 (first-type transmission line 31) is connected to the third sub-transmission line 303 (second-type transmission line 32) through the sixth sub-transmission line 306 (third-type transmission line 33), and the third sub-transmission line 303 (second-type transmission line 32) is connected to the second sub-transmission line 302 (first-type transmission line 31) through the seventh sub-transmission line 307 (third-type transmission line 33).

Referring to fig. 5, the third type transmission line 33 may be used to connect the first type transmission line 31 and the second type transmission line 32, where the cross-sectional dimensions of the first type transmission line 31, the third type transmission line 33 and the second type transmission line 32 are sequentially increased, and by setting and changing the third type transmission line 33, the transition between the first type transmission line 31 and the second type transmission line 32 is smoother and more consistent, and the stability of signal transmission is improved.

In some embodiments, the third type of transmission line 33 may be formed by a coaxial cable loop-strip. The coaxial cable comprises at least an inner conductor, a dielectric layer and an outer conductor coaxially arranged, the dielectric layer being located between the inner conductor and the outer conductor, the third type of transmission line 33 being obtained by stripping the outer conductor.

The third type of transmission line 33 is a second dielectric layer 33b, which can separate the third inner conductor 33a from the circuit board, avoid loss at the third sub-transmission line 303, and separate the first sub-transmission line 301 from the second sub-transmission line 302.

In some embodiments, the first type of transmission line 31, the second type of transmission line 32, and the third type of transmission line 33 are, for example, the same transmission line, and a complete second type of transmission line may be selected, and the transmission line is stripped at a preset position to form the first type of transmission line 31 and the third type of transmission line 33, which are used as a complete transmission line in the dual-band antenna.

When the dual-band antenna works, the signal fed by the feeding unit can be sequentially transmitted to the first sub-transmission line 301 through the fourth sub-transmission line 304 and the fifth sub-transmission line 305, and coupled to feed the first radiating unit 201 through the first sub-transmission line 301, and then sequentially transmitted to the second sub-transmission line 302 through the sixth sub-transmission line 306, the third sub-transmission line 303 and the seventh sub-transmission line 307, and directly fed to the third radiating unit 203 through the second sub-transmission line 302. The second radiating element 202 is connected to the third sub-transmission line 303 and may be grounded through the third sub-transmission line 303.

The embodiment of the application does not limit the shape of the vibrator arm. In other embodiments, as shown in fig. 14, 15, 16 and 17, the vibrator arm adopts an "L" shape structure. The "L" shaped structure includes a first side parallel to the x-axis and a second side parallel to the y-axis.

As shown in fig. 14, the first radiating element 201 includes a first high-frequency vibrator 2011 and a first low-frequency vibrator 2012 connected in parallel. The first high-frequency vibrator 2011 includes a first high-frequency vibrator arm and a second high-frequency vibrator arm arranged along a first direction.

The first low frequency vibrator 2012 includes a first low frequency vibrator arm and a second low frequency vibrator arm arranged along a first direction.

The first high-frequency oscillator arm and the first low-frequency oscillator arm are both of L-shaped structures, and the first high-frequency oscillator arm and the first low-frequency oscillator arm share a first side of the L-shaped structures.

The second high-frequency oscillator arm and the second low-frequency oscillator arm are both L-shaped structures, and the second high-frequency oscillator arm and the second low-frequency oscillator arm share a first side of the L-shaped structures.

The extending directions of the second sides of the first high-frequency oscillator arm and the second high-frequency oscillator arm are opposite, as shown in fig. 14, the extending direction of the second side of the first high-frequency oscillator arm is a +y direction, and the extending direction of the second side of the second high-frequency oscillator arm is a-y direction.

The second side extension directions of the first low-frequency oscillator arm and the second low-frequency oscillator arm are opposite, and as shown in fig. 14, the second side extension direction of the first low-frequency oscillator arm is the +y direction, and the second side extension direction of the second low-frequency oscillator arm is the-y direction.

Therefore, the vibrator arms adopt an L-shaped structure, and the two parallelly connected vibrator arms share the first edge of the L-shaped structure, so that the space occupied by the parallelly connected vibrators can be reduced, the space is saved, and compared with the wiring of the single-frequency vibrators, the wiring is not required to be additionally increased, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

Referring next to fig. 14, the second radiating unit 202 includes a second high-frequency vibrator 2021.

In some embodiments, the second radiating element is a dipole radiating element, wherein the second high frequency vibrator 2021 is a dipole vibrator. As shown in fig. 14, the second radiating unit 202 includes a second high-frequency vibrator 2021.

As shown in fig. 14, the second high-frequency vibrator 2021 includes a third high-frequency vibrator arm and a fourth high-frequency vibrator arm arranged in the first direction.

The third high-frequency oscillator arm and the fourth high-frequency oscillator arm are of L-shaped structures, the extending directions of the second sides are opposite, the extending direction of the second side of the third high-frequency oscillator arm is in the +y direction, and the extending direction of the second side of the fourth high-frequency oscillator arm is in the-y direction.

As shown in fig. 14, the second low-frequency vibrator 2032 includes a third low-frequency vibrator arm and a fourth low-frequency vibrator arm arranged along the first direction.

The third high-frequency vibrator 2031 includes a fifth high-frequency vibrator arm and a sixth high-frequency vibrator arm arranged in the first direction.

The third low frequency oscillator arm is connected in parallel with the fifth high frequency oscillator arm, and the fourth low frequency oscillator arm is connected in parallel with the sixth high frequency oscillator arm.

The third low-frequency oscillator arm and the fifth high-frequency oscillator arm are of L-shaped structures, the extending directions of the second sides are the same, and the third low-frequency oscillator arm and the fifth high-frequency oscillator arm share the first side of the L-shaped structures.

The fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm are of L-shaped structures, the extending directions of the second sides are the same, and the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm share the first side of the L-shaped structures.

The second side extending directions of the third low-frequency oscillator arm and the fourth low-frequency oscillator arm are opposite, as shown in fig. 6, the second side extending direction of the third low-frequency oscillator arm is a +y direction, and the second side extending direction of the fourth low-frequency oscillator arm is a-y direction.

The second side extension directions of the fifth high-frequency oscillator arm and the sixth high-frequency oscillator arm are opposite, and as shown in fig. 6, the second side extension direction of the fifth high-frequency oscillator arm is the +y direction, and the second side extension direction of the sixth high-frequency oscillator arm is the-y direction.

The oscillator arm adopts an L-shaped structure, and the two oscillator arms connected in parallel share the first edge of the L-shaped structure, so that the space occupied by the parallel oscillators can be reduced, the space is saved, and compared with the wiring of the single-frequency oscillator, the wiring is not required to be additionally increased, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

The difference between fig. 15 and fig. 14 is that each radiating element in fig. 14 has an axisymmetric structure, and each radiating element in fig. 15 has a central symmetric structure.

Fig. 16 differs from fig. 14 in that the high frequency oscillator and the low frequency oscillator in the first radiating element and the third radiating element in fig. 14 are connected to the same end of the first side of the L-shaped structure, and in that the high frequency oscillator and the low frequency oscillator in the first radiating element and the third radiating element in fig. 16 are connected to different ends of the first side of the L-shaped structure, for example, the high frequency oscillator in the first radiating element and the third radiating element are connected to one end of the first side of the L-shaped structure, and the low frequency oscillator is connected to the other end of the first side of the L-shaped structure.

Fig. 17 differs from fig. 16 in that each radiating element in fig. 16 has an axisymmetric structure, and each radiating element in fig. 17 has a central symmetric structure.

In the present application, the dual-band antenna shown in fig. 5, 14, 15 and 16 is only used as an example, and the shape and symmetry of the dipole arm are not limited, and other shapes and symmetry of the dipole arm can be adopted, which are all within the scope of the present application.

Fig. 18 is a schematic diagram of a radiation pattern of a dual-band antenna in a first frequency band according to an embodiment of the present application. As shown in fig. 18, the dual-band antenna has better in-band directivity of the 5G band, i.e., the high-frequency signal.

Fig. 19 is a schematic diagram of a radiation pattern of a dual-band antenna in a second frequency band according to an embodiment of the present application. As shown in fig. 19, the dual-band antenna has better in-band directivity of the pattern in the 2.4G frequency band, i.e., the low-frequency signal.

As shown in fig. 18 and 19, the dual-frequency antenna is an omni-directional antenna, and the high-frequency directional diagram and the low-frequency directional diagram are regular in shape, which means that the isolation of the two is higher and the mutual interference is smaller.

The application provides a dual-frequency antenna which comprises a feed unit, a circuit board, a first radiation unit, a second radiation unit, a third radiation unit and a transmission line, wherein the first radiation unit, the second radiation unit, the third radiation unit and the transmission line are arranged on the first surface of the circuit board, the first radiation unit, the second radiation unit and the third radiation unit are sequentially arranged on the first surface along a first direction and are connected in series through the transmission line, the first radiation unit is further connected with the feed unit through the transmission line, and the feed unit is used for transmitting or receiving signals through the transmission line. The plurality of radiating units are arranged on the same surface of the circuit board, and only single-sided wiring welding is needed, so that wiring difficulty is reduced, manufacturing process is simplified, and production cost is reduced. The first radiation unit comprises a first high-frequency oscillator and a first low-frequency oscillator which are connected in parallel, the second radiation unit comprises a second high-frequency oscillator, the third radiation unit comprises a third high-frequency oscillator and a second low-frequency oscillator which are connected in parallel, the working frequency ranges of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are first frequency ranges, and the working frequency ranges of the first low-frequency oscillator and the second low-frequency oscillator are second frequency ranges. Therefore, in the first radiation unit and the third radiation unit, the high-frequency oscillator and the low-frequency oscillator are connected in parallel, so that space is saved. In addition, only one transmission line is needed, the feeding unit and the plurality of radiating units can be connected in series, welding spots are reduced, and short circuit risks are reduced. The dual-frequency antenna realizes concurrency of two frequency bands of 2.4G and 5G, and the standing wave impedance meets the requirement of-10 dB.

Based on the same technical conception, the application also provides communication equipment which comprises a shell, a control circuit and the double-frequency antenna. The dual-frequency antenna and the control circuit are arranged on the shell, and the dual-frequency antenna is electrically connected with the control circuit.

The control circuit is used for processing signals, and the dual-frequency antenna is used for transmitting signals. Specifically, the dual-frequency antenna may transmit the signal processed by the control circuit, or the control circuit may receive the signal received by the dual-frequency antenna and process the signal. The isolation degree of the dual-frequency antenna is high, and the gain is high, so that the communication effect of the communication equipment is good.

In a specific embodiment, the specific type of the communication device is not limited. For example, the communication device may be a router or a set top box, etc., primarily a WiFi communication device.

Based on the same technical conception, the application also provides a chip which comprises a control circuit and the dual-frequency antenna in any technical scheme. The dual-frequency antenna is electrically connected with the control circuit. Specifically, the control circuit and the dual-frequency antenna can form a packaging structure so as to simplify the mounting process of the chip. The control circuit is used for processing signals, and the dual-frequency antenna is used for transmitting input and output signals of the control circuit. Specifically, the dual-frequency antenna may transmit the signal processed by the control circuit, or the control circuit may receive the signal received by the dual-frequency antenna and process the signal. The isolation degree of the dual-frequency antenna is high, and the gain is high, so that the communication effect of the chip is good.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A dual-band antenna, characterized in that it comprises: a circuit board, a first radiating element, a second radiating element, a third radiating element, a transmission line, and a feeding unit;

The circuit board includes a first surface and a second surface that are opposite to each other;

The first radiating unit, the second radiating unit, and the third radiating unit are arranged sequentially on the first surface along the first direction. The first radiating unit, the second radiating unit, and the third radiating unit are connected in series through the transmission line. The first radiating unit is also connected to the feeding unit through the transmission line. The feeding unit is used to transmit or receive signals through the transmission line.

The first radiating element includes: a first high-frequency oscillator and a first low-frequency oscillator connected in parallel;

The second radiating element includes: a second high-frequency oscillator;

The third radiating unit includes: a third high-frequency oscillator and a second low-frequency oscillator connected in parallel;

The operating frequency bands of the first low-frequency oscillator and the second low-frequency oscillator are the first frequency band, and the operating frequency bands of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are the second frequency band.

2. The dual-frequency antenna according to claim 1, characterized in that the length _l1 of the vibrator arm of the first low-frequency vibrator and the second low-frequency vibrator satisfies: Where _λ1 is the wavelength of the electromagnetic wave in the first frequency band, and _A1 is the error threshold;

The lengths _l2 of the oscillator arms of the first, second, and third high-frequency oscillators satisfy: Where _λ2 is the wavelength of the electromagnetic wave in the first frequency band, and _A2 is the error threshold.

3. The dual-frequency antenna according to claim 1 or 2, characterized in that the distance d between the first low-frequency vibrator and the second low-frequency vibrator satisfies: |d- _λ1 | _≤A3 , where _λ1 is the wavelength of the electromagnetic wave in the first frequency band, and _A3 is the error threshold;

The spacing between the first high-frequency oscillator and the second high-frequency oscillator, and the spacing D between the second high-frequency oscillator and the third high-frequency oscillator, satisfy: |D- _λ2 | _≤A4 , where _λ2 is the wavelength of the electromagnetic wave in the second frequency band, and _A4 is the error threshold.

4. The dual-frequency antenna according to any one of claims 1-3, wherein the first low-frequency vibrator comprises: a first low-frequency vibrator arm and a second low-frequency vibrator arm arranged along the first direction;

The first high-frequency oscillator includes: a first high-frequency oscillator arm and a second high-frequency oscillator arm arranged along the first direction;

The first low-frequency vibrating arm and the first high-frequency vibrating arm are connected in parallel, and the second low-frequency vibrating arm and the second low-frequency vibrating arm are connected in parallel;

The second high-frequency oscillator includes: a third high-frequency oscillator arm and a fourth high-frequency oscillator arm arranged along the first direction;

The second low-frequency oscillator includes a third low-frequency oscillator arm and a fourth low-frequency oscillator arm arranged along the first direction;

The third high-frequency oscillator includes: a fifth high-frequency oscillator arm and a sixth high-frequency oscillator arm arranged along the first direction;

The third low-frequency vibrating arm and the fifth high-frequency vibrating arm are connected in parallel, and the fourth low-frequency vibrating arm and the sixth high-frequency vibrating arm are connected in parallel.

5. The dual-frequency antenna according to claim 4, wherein the vibrating arms are all U-shaped structures, wherein two parallel vibrating arms share the bottom edge of the U-shaped structure, and the opening directions of the two parallel vibrating arms are the same, while the opening directions of the two vibrating arms in the same vibrator are opposite.

6. The dual-frequency antenna according to claim 4, wherein all the vibrating arms are L-shaped structures, wherein two vibrating arms connected in parallel share the bottom edge of the L-shaped structure.

7. The dual-band antenna according to claim 5 or 6, characterized in that the first radiating element includes a coupling stub, the second radiating element includes a grounding point, the third radiating element includes a feed point, the transmission line includes a first sub-transmission line, a second sub-transmission line and a third sub-transmission line, the coupling stub is coupled to the first sub-transmission line, the feed point is connected to the second sub-transmission line, the grounding point is connected to the third sub-transmission line, and the first sub-transmission line is connected to the second sub-transmission line through the third sub-transmission line.

8. The dual-frequency antenna according to claim 7, wherein the coupling stub is U-shaped, and the bottom edges of the first high-frequency dipole arm and the first low-frequency dipole arm are respectively provided with openings, the two ends of the coupling stub are respectively connected to the two ends of the openings, and the coupling stub is arranged around the first sub-transmission line.

9. The dual-frequency antenna according to claim 7 or 8, wherein the fourth low-frequency dipole arm and the sixth high-frequency dipole arm are connected to the second sub-transmission line.

10. The dual-band antenna according to any one of claims 7-9, wherein the first sub-transmission line and the second sub-transmission line are first type transmission lines, the first type transmission line comprising: a first inner conductor and an insulating layer, the insulating layer being located between the inner conductor and the circuit board.

11. The dual-frequency antenna according to claim 10, wherein the first type of transmission line further comprises: a conductive sheet, the conductive sheet being located on the side of the insulating layer away from the circuit board, the conductive sheet being connected to the inner conductor.

12. The dual-band antenna according to any one of claims 7-11, wherein the third sub-transmission line is a second type of transmission line, the second type of transmission line comprising: a second inner conductor, an outer conductor and a first dielectric layer, the second inner conductor and the outer conductor being coaxial, the first dielectric layer being located between the second inner conductor and the outer conductor, and the outer conductor being connected to the circuit board.

13. The dual-band antenna according to claim 12, wherein the transmission line further comprises: a fourth sub-transmission line, wherein the first radiating element is connected to the feeding element through the fourth sub-transmission line, and the fourth sub-transmission line is a second type of transmission line.

14. The dual-band antenna according to claim 13, characterized in that the transmission line further comprises: a fifth sub-transmission line, a sixth sub-transmission line, and a seventh sub-transmission line, wherein the fourth sub-transmission line is connected to the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line is connected to the third sub-transmission line through the sixth sub-transmission line, and the third sub-transmission line is connected to the second sub-transmission line through the seventh sub-transmission line, wherein the fifth sub-transmission line, the sixth sub-transmission line, and the seventh sub-transmission line are third-type transmission lines, the third-type transmission line comprising: a third inner conductor and a second dielectric layer, wherein the third inner conductor and the second dielectric layer are coaxial, and the second dielectric layer is located outside the third inner conductor.

15. The dual-band antenna according to any one of claims 1-14, wherein the first frequency band is a 2.4 GHz band and the second frequency band is a 5 GHz band.

16. The dual-frequency antenna according to any one of claims 1-15, wherein the vibrators of the first radiating element, the second radiating element, and the third radiating element are axisymmetric or centrosymmetric structures.

17. A communication device, characterized in that it comprises a housing, a control circuit, and a dual-band antenna as described in any one of claims 1-16, wherein the control circuit and the dual-band antenna are disposed in the housing and are electrically connected.

18. The communication device according to claim 17, wherein the communication device is a router.