CN103531906B - Mobile device - Google Patents

Abstract

The invention provides a mobile device. The mobile device at least includes a first antenna and a second antenna arranged adjacently, and the first antenna and the second antenna are connected through a conductor. Through the above manner, the present invention can improve the isolation between the first antenna and the second antenna.

Description

Mobile devices

technical field

The present invention relates to the technical field of mobile devices, in particular to a mobile device.

Background technique

Currently, mobile phones basically use three technologies: Code Division Multiple Access (CDMA), Universal Mobile Telecommunications System (UMTS) and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA). kind of encoding. Various existing standards have barriers between operators. With the development of science and technology, various standards will inevitably break through this barrier. Therefore, mobile phones need to support multiple standards.

Please refer to FIG. 1, which is a schematic structural diagram of a dual-pass mobile phone in the prior art. As shown in Figure 1, the dual-way mobile phone 10 in the prior art includes a CDMA antenna 101 and a Global System of Mobile Communication (Global System of Mobile Communication, GSM) antenna 102, and the CDMA antenna 101 and the GSM antenna 102 are arranged on the dual-way mobile phone 10 respectively. Both sides of the bottom, in order to realize the dual-way mobile phone 10 can carry on the conversation simultaneously in CDMA and GSM. The transmitting frequency band of GSM antenna 102 is 880-915MHz, and the receiving frequency band of CDMA antenna 101 is 880-894MHz. The transmitting frequency band of GSM antenna 102 and the receiving frequency band of CDMA antenna 101 basically coincide. Ensure that the reception of the CDMA antenna 101 is free from interference. However, when the CDMA antenna 101 and the GSM antenna 102 are fed separately, the isolation between the CDMA antenna 101 and the GSM antenna 102 is -11.2 dB, which is poor.

Contents of the invention

In view of this, an embodiment of the present invention provides a mobile device, so as to improve the isolation between multiple antennas in the mobile device.

A first aspect provides a mobile device, which at least includes a first antenna and a second antenna arranged adjacently, and the first antenna and the second antenna are connected through a conductor.

With reference to the first aspect, in a first possible implementation manner, the first antenna includes a first ground feed point, the second antenna includes a second ground feed point, and the conductor connects the first ground feed point and the second ground feed point.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the first ground feed point and the second ground feed point are grounded through a conductor.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the first ground feed point and the second ground feed point are respectively grounded.

In combination with the first aspect or any one of the possible implementations from the first to the third, in the fourth possible implementation, the conductor is a conductive wire, the length of the conductive wire is λ/4, and the value of λ is The range is the wavelength range in the propagation medium of the frequency band that needs to be isolated from the first antenna and the second antenna.

In combination with the fourth possible implementation of the first aspect, in the fifth possible implementation:

λ=λ ₀ /sqrt(Eeff)

Among them, the value range of λ ₀ is the wavelength range of the frequency band to be isolated in vacuum, Eeff is the relative permittivity of the propagation medium, and sqrt is the square root function.

In combination with the first aspect or any one of the first to fifth possible implementations, in the sixth possible implementation, the mobile device further includes a PCB board, and the conductor is a microstrip line arranged on the PCB board .

With reference to the first aspect or any one of the first to sixth possible implementation manners, in a seventh possible implementation manner, the conductor is integrally formed with the first antenna and the second antenna.

In combination with the first aspect or any one of the first to seventh possible implementation manners, in an eighth possible implementation manner, the conductor is a straight line or a wall-shaped line.

In combination with the first aspect or any one of the first to eighth possible implementations, in the ninth possible implementation, the first antenna is a Global System for Mobile Communications GSM antenna, and the second antenna is a Code Division Multiple Access CDMA antenna.

Through the above solution, the beneficial effect of the present invention is that: the first antenna and the second antenna of the present invention are connected through a conductor, which can improve the isolation between the first antenna and the second antenna.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort. in:

Fig. 1 is the structural representation of dual-pass mobile phone in the prior art;

FIG. 2 is a schematic structural diagram of a mobile device according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mobile device according to a second embodiment of the present invention;

Fig. 4 is a schematic diagram showing that the first antenna and the second antenna in Fig. 3 are equivalent to a microwave network;

Fig. 5 is a schematic structural diagram of a mobile device according to a third embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 2 , which is a schematic structural diagram of a mobile device according to a first embodiment of the present invention. As shown in FIG. 2 , the mobile device 20 disclosed in this embodiment includes at least a first antenna 201 and a second antenna 202 arranged adjacently. Preferably, the first antenna 201 and the second antenna 202 are respectively arranged on the Bottom sides. In other embodiments, the first antenna 201 and the second antenna 202 may also be arranged at other positions of the mobile device 20 , for example, the first antenna 201 and the second antenna 202 are arranged at the top of the mobile device 20 .

In this embodiment, the first antenna 201 and the second antenna 202 are connected through a conductor 203 . When the feed point of the first antenna 201 is fed, part of the current of the first antenna 201 flows back to the ground through the conductor 203, reducing the impact of the current of the first antenna 201 on the second antenna 202; at the feed point of the second antenna 202 During feeding, part of the current of the second antenna 202 flows back to the ground through the conductor 203 , reducing the influence of the current of the second antenna 202 on the first antenna 201 , so as to improve the isolation between the first antenna 201 and the second antenna 202 .

Wherein, the first antenna 201 is a GSM antenna, a CDMA antenna, a UMTS antenna or a TD-SCDMA antenna, and the second antenna 202 is a GSM antenna, a CDMA antenna, a UMTS antenna or a TD-SCDMA antenna.

The present invention also provides the mobile device of the second embodiment, which is described in detail on the basis of the mobile device 20 disclosed in the first embodiment. As shown in FIG. 3 , the first antenna 201 includes a first ground feed point 204 and a first feed point 205 , and the second antenna 202 includes a second ground feed point 206 and a second feed point 207 . Wherein, the first ground feed point 204 and the second ground feed point 206 are connected by a conductor 203, and the conductor 203 may be a straight line or other shapes, such as a wall-shaped line. The first antenna 201 is grounded through the first ground feed point 204, and the first antenna 201 is fed through the first feed point 205; the second antenna 202 is grounded through the second ground feed point 206, and the second antenna 202 is grounded through the second feed point 207 Feed.

In this embodiment, the first antenna 201 may be a GSM antenna, and the second antenna 202 may be a CDMA antenna. Among them, the S parameters of N antennas satisfy the following formula:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}\\ {\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}\\ <span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span>\\ {\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; NN</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, the S parameter is the relationship between the incident wave and the reflected wave of the network port (N antennas), b _N is the normalized reflected wave, and a _N is the normalized incident wave.

The isolation between any two antenna i and antenna j satisfies the following formula:

Isolation＝10·log|S _ij | ² (2)

S _ij =b _i /a _j (a _i =0,1,2...N, i≠j) (3)

Please refer to FIG. 4 . FIG. 4 is a schematic diagram showing that the first antenna and the second antenna in FIG. 3 are equivalent to a microwave network. As shown in Figure 4, the first antenna 201 includes an input port 301 and an output port 302, the second antenna 202 includes an input port 303 and an output port 304, a ₁ is the input energy of the input port 301, b ₁ is the output of the output port 302 Energy, a ₂ is the input energy of the input port 303, b ₂ is the output energy of the output port 304, the S parameters and the isolation of the first antenna 201 and the second antenna 202 satisfy the following formula:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>\\ \mathrm{<span\; class="notranslate">\; Isolation</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; log</span>}{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Among them, the first ground feed point 204 and the second ground feed point 206 are connected through the conductor 203, the output energy of the output port 304 decreases, the b ₂ of the formula (4) becomes smaller, and the value of the isolation degree becomes smaller, so the first antenna The isolation (Isolation) between 201 and second antenna 202 becomes larger. For example, the value of the isolation between the first antenna 201 and the second antenna 202 decreases from -11dB to -12dB, and the isolation between the first antenna 201 and the second antenna 202 increases.

In this embodiment, the conductor 203 is a conductive wire, and the length of the conductive wire is set to λ/4, where the value range of λ is the wavelength range of the frequency band in the medium in which the first antenna 201 and the second antenna 202 need to be isolated, The frequency band where the first antenna 201 and the second antenna 202 need to be isolated is the frequency band where the first antenna 201 and the second antenna 202 overlap. λ satisfies the following formula:

λ=λ ₀ /sqrt(Eeff) (5)

Among them, the value range of λ ₀ is the wavelength range of the frequency band to be isolated in vacuum, Eeff is the relative permittivity of the medium, and sqrt is the square root function. Preferably, λ is the middle value of the wavelength range in the medium of the frequency band that needs to be isolated between the first antenna 201 and the second antenna 202 . For example: the frequency band to be isolated is F1-F2, the wavelength range of this frequency band in the propagation medium is λ1-λ2, the value range of λ is λ1-λ2, preferably, λ is (λ1+λ2)/2.

When the length of the conductive wire is λ/4, the conductive wire is equivalent to an impedance-transformed microstrip line. In the frequency band that needs to be isolated, the conductive wire has pure impedance characteristics. At this time, the conductive wire consumes a lot of energy, so as to reduce the first The influence of the antenna 201 on the second antenna 202 or the influence of the second antenna 202 on the first antenna 201, so the degree of isolation between the first antenna 201 and the second antenna 202 is the largest.

In this embodiment, the conductor 203 can be made integrally with the first antenna 201 and the second antenna 202 . When feeding power at the first feed point 205, the current of the first antenna 201 will flow back to the ground from the second ground feed point 206 of the second antenna 202 through the first ground feed point 204 and the conductor 203, reducing the first The influence of the antenna 201 on the second antenna 202; when the second feed point 207 is fed, the current of the second antenna 202 will pass through the second ground feed point 206 and through the conductor 203 from the first ground feed of the first antenna 201 The point 204 flows back to the ground, reducing the influence of the second antenna 202 on the first antenna 201 ; thereby improving the isolation between the first antenna 201 and the second antenna 202 .

In other embodiments, those skilled in the art may arrange the conductor 203 on other components of the mobile device 20, for example, the conductor 203 is disposed on a printed circuit board (Printed Circuit Board, PCB) of the mobile device 20. microstrip line.

The present invention also provides the mobile device of the third embodiment, which is described in detail on the basis of the mobile device disclosed in the second embodiment. The mobile device disclosed in this embodiment differs from the mobile device disclosed in the second embodiment in that: as shown in FIG. A ground feed point 204 and a second ground feed point 206 are grounded through a conductor 203 , that is, the first antenna 201 and the second antenna 202 share a common ground. Wherein, the conductor 203 can be a straight line, or a wall-shaped line.

In this embodiment, when the first feeding point 205 feeds power, the current of the first antenna 201 will directly flow back to the ground through the conductor 203. Compared with the second antenna 202 of the second embodiment, it flows through the second The current of the antenna 202 is reduced; when the second feeding point 207 is fed, the current of the second antenna 202 will directly flow back to the ground through the conductor 203, compared with the first antenna 201 of the second embodiment, it flows through the first The current of the antenna 201 decreases. Therefore, compared with the mobile device disclosed in the second embodiment, the isolation between the first antenna 201 and the second antenna 202 in the mobile device disclosed in this embodiment is better.

Wherein, the mobile device mentioned in the whole text of the present invention is a mobile phone as an example, of course, it is not limited to a mobile phone, and may also be a tablet computer (PAD), a personal computer, and the like.

To sum up, the first antenna and the second antenna of the present invention are connected through a conductor, which can improve the isolation between the first antenna and the second antenna.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of the present invention in the same way.

Claims (7)

1. a mobile device, it is characterised in that described mobile device at least includes being disposed adjacent First antenna and the second antenna, described first antenna is connected by electric conductor with described second antenna； Described first antenna includes that the first ground feed point and the first distributing point, described second antenna include the second ground Feed point and the second distributing point, described electric conductor connects described first ground feed point and described second ground feedback Point, described first ground feed point and described second ground feed point ground connection respectively；

When described first distributing point feed, the electric current of described first antenna is presented by described first ground Put and flow back into ground by described electric conductor from the second ground feed point of described second antenna；

When described second distributing point feed, the electric current of described second antenna is presented by described second ground Put and flow back into ground by described electric conductor from the first ground feed point of described first antenna.

Mobile device the most according to claim 1, it is characterised in that described electric conductor is for leading Electric wire, a length of λ/4 of described conductor wire, the span of described λ be described first antenna and Described second antenna needs the frequency range of isolation wave-length coverage in propagation medium.

Mobile device the most according to claim 2, it is characterised in that:

λ=λ₀/sqrt(Eeff)

Wherein, λ₀Span be the described frequency range wave-length coverage in a vacuum needing isolation, Eeff is the relative dielectric constant of propagation medium, and sqrt is square root function.

4. according to the arbitrary described mobile device of claim 1-3, it is characterised in that described movement Equipment also includes that pcb board, described electric conductor are the microstrip line being arranged on described pcb board.

5. according to the arbitrary described mobile device of claim 1-3, it is characterised in that described conduction Body is made into integration with described first antenna and described second antenna.

6. according to the arbitrary described mobile device of claim 1-3, it is characterised in that described conduction Body is straight line or city wall shape line.

7. according to the arbitrary described mobile device of claim 1-3, it is characterised in that described first Antenna is global system for mobile communications GSM antenna, and described second antenna is CDMA CDMA Antenna.