CN207638003U - Antenna devices and electronic equipment - Google Patents

Abstract

The utility model provides an antenna device and electronic equipment. The antenna device (101) is provided with an antenna coil (20) composed of coil conductors (20C) along the surface, and a power supply coil (30) arranged at a position where the antenna coil (20) is magnetically coupled. The antenna device (101) is further provided with a planar conductor (10). The planar conductor (10) is disposed on the antenna coil (20) side with respect to the power supply coil (30), is formed in the vicinity of the 1 st portion (21) of the antenna coil (20) in a plan view, extends from the 1 st portion (21) of the antenna coil (20) to the outside of the antenna coil (20), and has a region that does not overlap with the coil opening (20A) of the antenna coil (20). The power supply coil (30) is disposed at a position magnetically coupled to at least the 2 nd portion (22) of the antenna coil (20) other than the 1 st portion (21).

Description

Antenna devices and electronic equipment

technical field

The utility model relates to an antenna device, in particular to an antenna device with an antenna coil and a power supply coil. Furthermore, this invention relates to the electronic equipment provided with this antenna device.

Background technique

Patent Document 1 discloses an antenna device including an antenna coil constituted by a coil conductor extending along the surface, and a feeding coil mainly magnetically coupled to the antenna coil. FIG. 10(A) is a front view of the antenna device shown in Patent Document 1, and FIG. 10(B) is a plan view thereof. A power supply circuit is formed on the circuit board 50 , and the power supply coil 30 connected to the power supply circuit is mounted. The antenna coil 20 is arranged close to the feed coil 30 , so that the feed coil 30 and the antenna coil 20 are mainly magnetically coupled.

In this way, by magnetically coupling the feeding coil 30 and the antenna coil 20 , it is possible to connect the feeding circuit to the antenna coil without using a flexible cable or a contact pin.

prior art literature

patent documents

Patent Document 1: International Publication No. 2012/173080

Utility model content

-Technical problems to be solved by the utility model-

In the configuration of the antenna device illustrated in FIG. 10 , the feeding coil 30 and the antenna coil 20 are magnetically coupled via the magnetic flux φn passing through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20 . However, in the magnetic flux passing through the coil opening of the feeding coil 30 , a magnetic flux that does not contribute to the coupling with the antenna coil 20 as represented by the magnetic flux φa may be generated. In this way, if a magnetic flux that does not contribute to the coupling is generated, the coupling coefficient between the feeding coil 30 and the antenna coil 20 cannot be sufficiently increased.

An object of the present invention is to provide an antenna device including an antenna coil and a feeding coil composed of a coil conductor and having an improved coupling coefficient between the feeding coil and the antenna coil, and an electronic device including the antenna device.

-Means for solving technical problems-

(1) The antenna device of the present utility model is characterized in that it possesses:

An antenna coil composed of coil conductors along the surface; and a power supply coil arranged at a position for magnetic coupling with the antenna coil,

The antenna device includes a planar conductor that is disposed on the antenna coil side with respect to the feeding coil, and is formed near a first portion of the antenna coil in a plan view. The first part of the antenna coil extends to the outside of the antenna coil and has a region that does not overlap with the coil opening of the antenna coil,

The feeding coil is arranged at a position where it is magnetically coupled to at least a second portion other than the first portion of the antenna coil.

According to the above configuration, the magnetic flux passing through the coil opening of the feed coil but not passing through the coil opening of the antenna coil is blocked by the planar conductor. Accordingly, the magnetic flux penetrating the coil opening of the feed coil and the coil opening of the antenna coil relatively increases, and an antenna device having a high coupling coefficient between the feed coil and the antenna coil is obtained.

(2) In the above (1), it is preferable that at least a part of the first portion of the antenna coil is opposed to the feeding coil with a coil axis of the antenna coil interposed therebetween. As a result, the effective area of the coil opening of the antenna coil viewed from the feed coil increases, and thus the coupling coefficient between the feed coil and the antenna coil can be further improved.

(3) In the above (1) or (2), preferably, the planar conductor has a first side, the first part of the antenna coil extends along the first side of the planar conductor, and the feed coil The coil axis direction is a direction perpendicular to the first side of the planar conductor. This can more effectively prevent the generation of magnetic flux that does not contribute to coupling due to the planar conductor, and thus effectively improve the coupling coefficient between the feeding coil and the antenna coil.

(4) In any one of the above (1) to (3), it is preferable that when viewed from above in the direction of the coil axis of the antenna coil, the feeding coil and the coil opening of the antenna coil or the space between the antenna coil Part 2 overlaps. Thus, since one of the two coil openings of the feeding coil is close to the coil opening of the antenna coil, the magnetic flux penetrating the coil opening of the feeding coil and the coil opening of the antenna coil is relatively increased, and the feeding coil and the antenna coil are relatively increased. An antenna device having a high coupling coefficient of an antenna coil.

(5) In any one of (1) to (4) above, it is preferable that the coil conductor is a conductor pattern formed on a circuit board. Thereby, an antenna coil having a large coil opening can be easily arranged, and a feeding coil can be easily arranged close to the antenna coil. For this reason, efficient antenna characteristics are obtained.

(6) In any one of (1) to (5) above, it is preferable that the planar conductor is a ground conductor formed on a circuit board. Thereby, it is not necessary to specially provide a planar conductor, and miniaturization can be achieved.

(7) The electronic equipment of the present invention is characterized in that it is equipped with an antenna device and a casing,

The antenna device has:

an antenna coil consisting of coil conductors along the surface; and

a power supply coil disposed at a position for magnetic coupling with the antenna coil,

The antenna device includes a planar conductor that is disposed on the antenna coil side with respect to the feeding coil, and is formed near a first portion of the antenna coil in a plan view. The first part of the antenna coil extends to the outside of the antenna coil and has a region that does not overlap with the coil opening of the antenna coil,

The feeding coil is arranged at a position where it is magnetically coupled to at least a second portion other than the first portion of the antenna coil.

According to the above configuration, it is possible to configure an antenna device having a high coupling coefficient between the feed coil and the antenna coil, and obtain an electronic device including a highly efficient antenna device.

(8) In the above (7), preferably, the housing has a conductor portion, and the antenna coil is connected to the conductor portion of the housing. Accordingly, the conductor portion of the case can also be used as a part of the antenna coil, and it is easy to configure the antenna coil with a large coil opening. Furthermore, since the antenna coil is closer to the antenna of the communication partner, the coupling coefficient with the antenna of the communication partner increases.

(9) In the above (7), it is preferable that the planar conductor is a conductor portion of the case. Thereby, the conductor part of a case can be used also as a planar conductor, for example, the degree of freedom of arrangement|positioning of the conductor pattern other than a planar conductor on a circuit board increases.

-Utility model effect-

According to the present invention, an antenna device having a high coupling coefficient between a feeding coil and an antenna coil, and an electronic device including the same are obtained.

Description of drawings

FIG. 1 is a plan view showing the configuration of an antenna device 101 according to the first embodiment.

FIG. 2(A) is a cross-sectional view of the antenna device 101 at part A-A, and FIG. 2(B) is a cross-sectional view of the antenna device 101P as a comparative example.

3(A) to (C) are cross-sectional views of antenna devices 102A to 102C according to the second embodiment.

FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment.

FIG. 5 is a sectional view at part A-A of the antenna device 103 .

FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment.

7 is a plan view showing the configuration of an antenna device 105 and an electronic device 205 including the antenna device 105 according to the fifth embodiment.

FIG. 8 is a perspective view showing the configuration of the first conductor part 1, the second conductor part 2, and the circuit board 100 of the housing of the electronic device 205. As shown in FIG.

FIG. 9(A) is an equivalent circuit diagram showing the operation of the antenna device 105 in the second frequency band. FIG. 9(B) is an equivalent circuit diagram showing the operation of the antenna device 105 in the first frequency band.

FIG. 10(A) is a front view of the antenna device shown in Patent Document 1, and FIG. 10(B) is a plan view thereof.

Detailed ways

Hereinafter, several specific examples will be given with reference to the drawings, and a plurality of aspects for implementing the present invention will be shown. In each figure, the same symbol is given to the same part. In consideration of easiness of description and understanding of key points, the embodiments are shown separately for convenience, but partial replacement or combination of configurations shown in different embodiments is possible. In the following description of the second embodiment, the description of matters common to the first embodiment will be omitted, and only the points of difference will be described. In particular, the same effect based on the same configuration will not be mentioned one by one in each embodiment.

In each of the embodiments described hereinafter, a "standing wave antenna" refers to an antenna that generates a standing wave of current or voltage (potential) on a radiation element. That is, the resonance is performed so that a node or an abdomen of the intensity of a current or a voltage (potential) is generated on the radiating element. For example, due to the boundary condition of the current or voltage (potential) on the radiation element, the current at the end of the radiation element becomes 0, and when the radiation element is connected to the ground, the voltage at the connection portion with the ground becomes 0. Typical standing wave antennas are dipole antennas, monopole antennas, inverted L antennas, inverted F antennas (IFA), 1-wavelength loop antennas, folded dipole antennas, folded monopole antennas, and microstrip antennas , patch antenna, plate inverted F antenna (PIFA), slot antenna, notch antenna, derivatives of each antenna (radiating elements are connected in parallel, there are multiple stubs, or the shape of the radiating element depends on location, etc.).

The standing wave antenna is used for communication based on electromagnetic waves (radio waves) in the far field. For example, it is used for calls and data communications in mobile phone terminals, wireless LAN communications, reception of satellite signals in GPS, and the like.

Note that, in each of the embodiments described below, a "magnetic field type antenna" refers to a type of micro loop antenna, and is an antenna that radiates magnetic flux.

Magnetic field antennas are used in the near field for communication based on magnetic field coupling. For example, it is used in communication such as NFC (Near field communication, near field communication).

In addition, in each of the embodiments described below, the antenna device as a "magnetic field type antenna" is used, for example, in the HF band, and is particularly employed at a frequency of 13.56 MHz or around 13.56 MHz. The size of the antenna device is very small compared to the wavelength λ in the used frequency, and the radiation characteristics of electromagnetic waves in the used frequency band are poor. The length of the coil conductor of the antenna coil included in the antenna device described later is λ/10 or less. In addition, the wavelength referred to here refers to a wavelength in consideration of the effectiveness of the wavelength shortening effect due to the dielectric properties or magnetic permeability of the base material forming the antenna. The coil conductor included in the antenna coil is electrically connected to a power supply circuit that operates in a used frequency band (HF band, especially around 13.56 MHz).

The "electronic device" in this invention is a device equipped with the above-mentioned standing wave type antenna and magnetic field type antenna. Examples are mobile phone terminals, so-called smart phones, tablet terminals, notebook PCs, wearable terminals (so-called smart watches or smart glasses, etc.).

"First Embodiment"

FIG. 1 is a plan view showing the configuration of an antenna device 101 according to the first embodiment. FIG. 2(A) is a cross-sectional view of the antenna device 101 at part A-A, and FIG. 2(B) is a cross-sectional view of the antenna device 101P as a comparative example.

The antenna device 101 includes an antenna coil 20 and a feeding coil 30 . The antenna coil 20 is formed inside (inner layer) of the circuit board 100 and is composed of a multi-turn coil conductor 20C along the surface of the circuit board 100 .

The feeding coil 30 is a spiral coil formed by a conductive pattern formed on a laminate obtained by laminating magnetic layers. The feeding coil 30 is arranged near the antenna coil 20 when viewed in plan in the direction of the coil axis 20AX of the antenna coil 20 . That is, the aforementioned helical coil of the feeding coil 30 is mounted on the circuit board 100 near the antenna coil 20 so as to be mainly magnetically coupled to the antenna coil 20 . In particular, by arranging the feeding coil 30 at a position overlapping with the coil opening 20A of the antenna coil 20 or the second portion 22 of the antenna coil 20, the above-mentioned helical coil of the feeding coil 30 can have a strong magnetic field with the antenna coil 20. coupling.

In addition, the antenna coil 20 is preferably arranged at a position as close as possible to the end of the circuit board 100 . Therefore, since the antenna coil 20 is closer to the communication partner, communication characteristics (coupling) are optimized. This also applies to other embodiments described below.

The capacitor 8 for resonance is mounted on the circuit board 100, and the capacitor 8 for resonance is connected to both ends of the coil conductor 20C. Therefore, an LC series resonance circuit is constituted by the antenna coil 20 and the resonance capacitor 8 .

A power supply circuit 9 based on an RFIC or the like is provided on the circuit board 100 , and the power supply circuit 9 is connected to the power supply coil 30 .

On the back surface of the circuit board 100 , for example, a planar conductor 10 serving as a ground conductor is formed. The area where the planar conductor 10 is formed is the ground area GA, and the area where the planar conductor 10 is not formed is the non-ground area NGA.

The planar conductor 10 is arranged near the first portion 21 of the antenna coil 20 . In particular, in the present embodiment, the first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view. The feeding coil 30 is arranged at a position where it is magnetically coupled to at least the second portion 22 other than the first portion 21 of the antenna coil 20 . As shown in FIG. 2(A) , the feeding coil 30 and the antenna coil 20 are magnetically coupled via the magnetic flux φn passing through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20 .

In addition, in the present invention, the "near side" of the first portion 21 of the antenna coil 20 refers to a range of distances below the size of the antenna coil 20 in plan view.

As shown in FIG. 1 , if the dimension L11 of the portion overlapping the first portion 21 of the antenna coil 20 is compared with the dimension L12 of the portion not overlapping the first portion 21 of the antenna coil 20, the planar conductor 10 is in the The relationship of L12>L11. That is, the planar conductor 10 extends from the first portion 21 of the antenna coil 20 to the outside of the antenna coil 20 . This can prevent the generation of magnetic flux that does not contribute to coupling due to the planar conductor, and thus can effectively improve the coupling coefficient between the feeding coil 30 and the antenna coil 20 .

If the magnetic flux passing through the coil opening of the feeding coil 30 intersects the planar conductor 10 or the magnetic flux based on the first portion 21 of the antenna coil 20 intersects the planar conductor 10, a magnetic flux will be generated in the planar conductor 10. vortex. For this reason, it is difficult for the magnetic flux to spread to the planar conductor 10, and it is difficult to generate a magnetic flux that does not contribute to the coupling with the antenna coil 20 represented by the magnetic flux φa in FIG. The second part 22 (coil opening 20A). As a result, the coupling coefficient between the feeding coil 30 and the antenna coil 20 is improved compared to the case where there is no planar conductor 10 .

In the present embodiment, as shown in FIG. 1 , at least a part of the first portion 21 of the antenna coil 20 faces the feeding coil 30 across the coil axis 20AX of the antenna coil 20 . As a result, the effective area of the coil opening 20A of the antenna coil 20 viewed from the feed coil 30 increases, and thus the coupling coefficient between the feed coil 30 and the antenna coil 20 can be further improved.

In addition, in this embodiment, the planar conductor 10 has the first side 10S, and the first portion 21 of the antenna coil 20 extends along the first side 10S of the planar conductor 10 . The coil axis 30AX direction of the feeding coil 30 is substantially perpendicular to the first side 10S of the planar conductor 10 . This can effectively prevent the generation of magnetic flux φa that does not contribute to coupling due to the planar conductor 10 , and thus can effectively improve the coupling coefficient between the feeding coil 30 and the antenna coil 20 .

Also, with respect to the plane (the plane 30S in FIG. 2(A) ) including at least the center of the feeding coil 30 , the plane 30S is bounded on one side (the lower side in the example shown in FIG. 2(A) ). By arranging both the antenna coil 20 and the planar conductor 10 , the coupling coefficient between the feeding coil 30 and the antenna coil 20 can be effectively increased. In the antenna device 101P shown in FIG. 2(B) exemplified as a comparative example, with respect to the plane 30S including the center of the feeding coil 30, the plane 30S is bounded on one side (the plane shown in FIG. 2(B)). In the example, the antenna coil 20 is arranged on the lower side, and the planar conductor 10 is arranged on the upper side. In the antenna device 101P of this comparative example, there is almost no effect of preventing the generation of magnetic flux φa that does not contribute to coupling, and there is almost no effect of improving the coupling coefficient between the feeding coil 30 and the antenna coil 20 .

In this embodiment, although the antenna coil 20 is formed inside (inner layer) of the circuit board 100 , it may be formed on the front or back of the circuit board 100 . In addition, the antenna coil 20 may not only be formed on the circuit board 100, but may be formed with a coil pattern on a flexible base material, or may be formed of conductive leads or the like.

In the present embodiment, although the planar conductor 10 is formed inside (inner layer) of the circuit board 100 , it may be formed on the front or back of the circuit board 100 . In addition, the planar conductor 10 may not only be formed on the circuit board 100, for example, when a battery pack or a shield disposed in the case including the antenna device 101, or the case has conductivity, the case or the like may be used as a surface. Shaped conductor 10 instead.

In this embodiment, although the planar conductor 10 is a ground conductor, it does not necessarily need to be a ground conductor. Again, no connection to ground is necessary. In this embodiment, the generation of magnetic flux that does not contribute to the coupling is largely irrelevant to the potential of the planar conductor 10 for the prevention effect. However, if the planar conductor 10 is at the ground potential, generation of unnecessary electromagnetic field noise from the planar conductor 10 can be suppressed.

In addition, it is preferable that the planar conductor 10 does not overlap the coil opening of the antenna coil 20 in a plan view. If the planar conductor 10 overlaps the coil opening of the antenna coil 20 , the magnetic field coupling between the feeding coil 30 and the antenna coil 20 is hindered. In the coil opening of the antenna coil 20 at least in plan view, if the area where the planar conductor 10 and the coil opening of the antenna coil 20 do not overlap is more than 1/3 of the coil opening, the power supply coil 30 and the antenna coil 20 are fully connected. Magnetic field coupling.

In addition, by forming the antenna coil 20 and the planar conductor 10 on the same circuit board 100 (including the case of multiple layers), the antenna coil 20 and the planar conductor 10 can be brought closer, so it is possible to prevent the antenna coil 20 from being separated from the planar conductor 100. The generation of the magnetic flux that penetrates between the shape conductors 10 and does not contribute to the coupling between the power supply coil 30 and the antenna coil 20 .

"Second Embodiment"

In the second embodiment, several types of antenna devices having different structures of antenna coils from those in the first embodiment are shown.

3(A) to (C) are cross-sectional views of the antenna devices 102A to 102C. All are cross-sectional views at positions opposite to the cross-sectional view shown in FIG. 2 in the first embodiment.

In the antenna device 102A of FIG. 3A , the antenna coil 20 is formed of a multi-turn coil conductor 20C extending over a plurality of layers inside the circuit board 100 along the surface of the circuit board 100 . The configuration other than the coil conductor 20C is the same as that of the antenna device 101 shown in FIG. 2 . In this way, the antenna coil may be constituted by the coil conductor 20C extending over a plurality of layers. Thus, an antenna coil with a given inductance can be configured with a limited area.

In the antenna device 102B of FIG. 3B , the planar conductors 10A and 10B are formed on both surfaces of the substrate 100 . The configuration other than the planar conductors 10A and 10B is the same as that of the antenna device 101 shown in FIG. 2 . In this way, the planar conductor may also be formed in a plurality of layers. In addition, the first part 21 of the antenna coil 20 may be arranged between the plurality of planar conductors 10A, 10B. Thereby, the magnetic flux which does not contribute to coupling can be shielded more reliably by a planar conductor.

In the antenna device 102C of FIG. 3(C), the planar conductor 10 is formed on the mounting surface of the feeding coil 30 . The configuration other than the planar conductor 10 is the same as that of the antenna device 101 shown in FIG. 2 . In this way, the planar conductor 10 may be arranged at a position closer to the feeding coil 30 than the first portion 21 of the antenna coil 20 . Accordingly, it is possible to prevent the generation of magnetic flux that penetrates between the antenna coil 20 and the planar conductor 10 and does not contribute to the coupling between the feeding coil 30 and the antenna coil 20 .

"Third Embodiment"

In the third embodiment, an antenna device is shown in which the position of the antenna coil and the configuration of the planar conductor are different from those in the first embodiment.

FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment. FIG. 5 is a sectional view at part A-A of the antenna device 103 .

The antenna coil 20 of the antenna device 103 is formed on the second surface S2 of the circuit board 100 and is composed of a multi-turn coil conductor 20C along the second surface of the circuit board 100 . In addition, planar conductors 10M and 10N as ground conductors are also formed on the second surface S2 of the circuit board 100 .

In the ground area GA where the planar conductors 10M and 10N are formed, a discontinuous portion DS for maintaining the insulating state between the planar conductors 10M and 10N and the first portion 21 of the antenna coil 20 is formed. There is the first part 21 of the antenna coil 20 .

As shown in FIG. 4 , resonance capacitor 8 is mounted on non-ground area NGA of circuit board 100 . Other configurations are the same as those of the antenna device 101 shown in FIG. 1 .

The antenna coil 20 and the planar conductors 10M, 10N are arranged so as not to overlap each other in plan view, thereby suppressing fluctuations in the inductance of the antenna coil 20 due to the arrangement of the planar conductors 10M, 10N. Furthermore, by forming the antenna coil 20 and the planar conductors 10M and 10N in the same planar shape, the antenna device 103 can be configured thinner.

In addition, the first planar conductor 10M and the second planar conductor 10N may be electrically connected by wiring formed inside the circuit board (inner layer) or the like. Thereby, the first planar conductor 10M and the second planar conductor 10N have the same potential, and generation of unnecessary electromagnetic field noise from the first planar conductor 10M or the second planar conductor 10N can be suppressed. In addition, even the second planar conductor 10N can be used as a ground for components mounted on a circuit board or the like.

In addition, in order not to hinder the magnetic field coupling between the feeding coil 30 and the antenna coil 20 , a configuration may be adopted in which the second planar conductor 10N is removed. In this case, the planar conductor 10M is arranged in the vicinity of the first portion 21 of the antenna coil 20 .

"Fourth Embodiment"

In the fourth embodiment, an antenna device in which the positional relationship of the feeding coil 30 with respect to the antenna coil 20 is different from that in the first embodiment is shown.

FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment. The first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view. The feeding coil 30 is arranged at a position where it is magnetically coupled to at least the second portion 22 of the antenna coil 20 . As shown in FIG. 6 , the feeding coil 30 and the antenna coil 20 are magnetically coupled via the magnetic flux φn passing through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20 .

As in the present embodiment, even at a position where the first portion 21 of the antenna coil 20 does not face the feeding coil 30 across the coil axis 20AX of the antenna coil 20, there is still a gap between the coil axis direction of the feeding coil 30 and the planar conductor. Even when the first side 10S of 10 is not in the vertical direction, the planar conductor 10 can prevent the generation of magnetic flux that does not contribute to coupling. According to the positional relationship between the power supply coil 30 and the antenna coil 20, the antenna of the communication partner side and the power supply coil 30 perform magnetic field coupling, so that the magnetic field coupling between the antenna of the communication partner side and the antenna coil 20 is canceled, and sometimes the coupling of the communication partner side antenna and the antenna device 104 The coefficient decreases. Thus, by selecting the positional relationship between the feeding coil 30 and the antenna coil 20 , it is possible to configure the antenna device 104 having excellent communication characteristics at a specific position.

In addition, in each embodiment shown above, although the direction of the coil axis 30AX of the feeding coil 30 and the coil opening of the antenna coil 20 were shown as an example parallel, this invention is not limited to this. For example, the direction of the coil axis 30AX of the feeding coil 30 and the direction of the coil axis 20AX of the antenna coil 20 may be substantially parallel.

"Fifth Embodiment"

In the fifth embodiment, configuration examples of the antenna device of the present invention and electronic equipment including the same are shown. In addition, in this embodiment, a configuration example of an electronic device including a magnetic field type antenna and a standing wave type antenna is shown.

FIG. 7 is a plan view showing the configuration of an antenna device 105 and an electronic device 205 including the antenna device 105 according to the fifth embodiment. FIG. 8 is a perspective view showing the configuration of the first conductor portion 1 , the second conductor portion 2 , and the circuit board 100 of the case of the electronic device 205 .

The electronic device 205 is, for example, a so-called smart phone or a portable electronic device having a communication function such as a tablet terminal.

The housing of the electronic device 205 has a first conductor part 1 and a second conductor part 2 . In FIG. 7 , the parts other than the first conductor part 1 and the second conductor part 2 (for example, the resin part) of the housing are omitted from illustration. The first conductor part 1 and the second conductor part 2 are, for example, molded bodies of metal plates such as anodized aluminum plates. The first conductor part 1 has three surfaces parallel to the Z direction, and the second conductor part 2 has three surfaces parallel to the Y direction. A circuit board 100 is provided inside the housing. In the example shown in FIG. 7 , the antenna device 105 is constituted by a circuit formed on the circuit board 100 and the first conductor portion 1 of the housing. In this embodiment, the second conductor portion 2 of the housing is an example of a planar conductor. In addition, the first conductor part 1 of the housing is a part of the antenna coil.

The circuit board 100 is provided with the power supply circuit 9 , the power supply coil 30 , the coil conductor 20C, the first frequency band shielding elements 7A and 7B, the resonance capacitor 8 , and the like. The first portion 21 of the antenna coil 20 overlaps the second conductor portion 2 of the case in plan view. The 1st end of 20 C of coil conductors is connected to the connection part P1 of the 1st conductor part 1 via 7 A of 1st band shield elements and the connection conductor 41. As shown in FIG. In addition, the 2nd end of 20 C of coil conductors is grounded. One end of the series circuit of the first band-shielding element 7B and the resonant capacitor 8 is connected to the connection point P2 of the first conductor portion 1 via the connection conductor 42 . The other end is grounded. The connecting conductors 41 and 42 are, for example, movable probe pins, conductive screws, and the like.

An antenna coil serving as a magnetic field type antenna is formed between the connecting portion P1-P2 of the first conductor portion 1 and the coil conductor 20C. The feeding coil 30 is arranged at a position where magnetic field coupling is performed between the connection points P1 - P2 of the first conductor portion 1 and the coil conductor 20C. The power supply coil 30 is connected to a power supply circuit 9 based on RFIC or the like.

The circuit board 100 is further provided with a power supply circuit 6 and a power supply circuit 5 for the first frequency band. A power supply circuit 5 is connected to a connection point P1 of the first conductor portion 1 via a power supply unit circuit 6 .

FIG. 9(A) is an equivalent circuit diagram showing the operation of the antenna device 105 in the second frequency band. In this example, since the power feeding unit circuit 6 has high impedance in the second frequency band (HF band), the power feeding unit circuit 6 and the power feeding circuit 5 are not shown in FIG. 9(A).

The antenna coil (the loop portion of the magnetic field type antenna for the second frequency band) is constituted by the connecting parts P1 and P2 of the first conductor part 1, the connecting conductors 41 and 42, the first frequency band shielding elements 7A and 7B, and the coil conductor 20C. . An LC series resonant circuit is constituted by the inductance of the loop portion and the resonant capacitor 8 .

In FIG. 9(A), the antenna coil 20 coupled to the feeding coil 30 is represented by one coil. Through the coupling between the antenna coil 20 and the feed coil 30 , a signal of the second frequency band is fed to the antenna coil.

According to this embodiment, since the conductor portion of the housing is also used as a part of the antenna coil, it is easy to configure an antenna coil with a large coil opening, and since the antenna coil is closer to the antenna of the communication partner, the coupling coefficient with the antenna of the communication partner is increased. high.

FIG. 9(B) is an equivalent circuit diagram showing the operation of the antenna device 105 in the first frequency band. In this example, the power supply unit circuit 6 shown in FIG. 7 is a capacitor for shielding the second frequency band. The first frequency band is, for example, the UHF band or the SHF band. In the first frequency band, since the power supply unit circuit 6 has low impedance, it is represented as a directly connected circuit in FIG. 9(B). In addition, in this example, the first frequency band shielding elements 7A and 7B are inductors and have high impedance in the first frequency band, so they are not shown as circuits in FIG. 9(B). In addition, the portions of the first frequency band shielding elements 7A and 7B may be LC parallel resonance circuits that resonate in the first frequency band.

The power supply circuit 5 is, for example, a UHF band or SHF band RFIC. The power supply circuit 5 supplies a signal of the first frequency band to the connection point P1 of the first conductor portion 1 . The first conductor portion 1 functions as a standing wave antenna such as an inverted L antenna.

In addition, in the several embodiments shown above, the example in which the planar conductor according to the present invention is constituted by the ground conductor formed on the circuit board and the conductor part of the housing is shown, but other The shield plate of the display panel, battery pack, etc. are also used as planar conductors.

In addition, in each embodiment shown above, although the planar shape of the circuit board 100, the planar conductor 10, and the outer shape of the antenna coil 20 were each shown as the example of a rectangle, it is not limited to this shape. Some or all of these may also be curved.

In addition, in each embodiment shown above, although it demonstrated that the feeding coil 30 and the antenna coil 20 are coupled mainly via a magnetic field, coupling via an electric field may also occur by virtue of the proximity of the conductor pattern of both. This electric field coupling is also utilized.

In addition, in the above-mentioned embodiment, although an example was shown in which the loop unit functions as a magnetic field radiation type antenna contributing to magnetic field radiation for near-field communication in the HF band (second frequency band), it is not limited to The composition. The loop unit can also be used as a power receiving antenna or a power transmitting antenna in a non-contact power transmission system utilizing at least magnetic field coupling, such as an electromagnetic induction method or a magnetic field resonance method. When the antenna device of the above-described embodiment is used as a power transmission device, the loop unit serves as a power transmission antenna, and the second power feeding circuit serves as a power transmission circuit that supplies electric power to the power transmission antenna. When the antenna device described above is used in a power receiving device, the loop unit serves as a power receiving antenna, and the second power feeding circuit serves as a power receiving circuit that supplies electric power from the power receiving antenna to a load in the power receiving device.

Finally, the description of the above-mentioned embodiment is an illustration in all respects, and it is not restrictive. Modifications and changes can be appropriately made by those skilled in the art. For example, partial replacement or combination of the configurations shown in the different embodiments is possible. The scope of the present invention is shown not by the above-mentioned embodiment but by the claims. Furthermore, it is intended that all changes within the meaning equivalent to a claim and a range are included in the scope of the present invention.

-Symbol Description-

DS...discontinuous part

GA…grounded area

NGA…Non-grounded area

P1, P2...connection parts

1...1st conductor part

2...2nd conductor part

5...power supply circuit

6... Power supply circuit

7A, 7B...1st frequency band shielding element

8... Capacitor for resonance

9...Power supply circuit

10, 10A, 10B, 10M, 10N...planar conductor

10S...1st side

20…antenna coil

20A...coil opening

20AX...coil axis of the antenna coil

20C...coil conductor

21...The first part of the antenna coil

22...Part 2 of the antenna coil

30…Power supply coil

30AX...coil shaft for supply coil

41, 42... Connecting conductors

50...circuit board

100...circuit board

101...antenna device

101P...antenna device of comparative example

102A, 102B, 102C...antenna device

103～105...antenna device

205…Electronic equipment.

Claims (8)

1. a kind of antenna assembly, has：

Circuit board；

The aerial coil that the coil-conductor of interarea by being configured at the circuit board and along the circuit board is constituted；With

It is configured at the circuit board and is configured in the power supply coil for the position for carrying out magnetic coupling with the aerial coil, In,

The antenna assembly has planar conductor, which is configured in the antenna line relative to the power supply coil Side is enclosed, is formed in the case of the vertical view of the circuit board near the 1st of the aerial coil, from the antenna line 1st outside for extending to the aerial coil of circle, and there is the not region Chong Die with the coil aperture of the aerial coil,

The power supply coil be configured at least with the 1st of the aerial coil other than the 2nd progress magnetic coupling position It sets.

2. antenna assembly according to claim 1, wherein

The 1st at least part of the aerial coil clip the coil axis of the aerial coil and with the power supply coil pair It sets.

3. antenna assembly according to claim 1 or 2, wherein

The planar conductor has the 1st side,

The 1st of the aerial coil extends along the 1st side of the planar conductor,

The coil axis direction of the power supply coil is the direction vertical with the 1st side of planar conductor.

4. antenna assembly according to claim 1 or 2, wherein

When the coil axis direction of the aerial coil is overlooked, the coil aperture of the power supply coil and the aerial coil 2nd overlapping of the interior or described aerial coil.

5. antenna assembly according to claim 1 or 2, wherein

The planar conductor is formed in the earth conductor of circuit board.

6. a kind of electronic equipment has antenna assembly and shell, wherein

The antenna assembly has：

The aerial coil being made of the coil-conductor along face；With

It is configured in the power supply coil for the position that magnetic coupling is carried out with the aerial coil,

The antenna assembly has planar conductor, which is configured in the antenna line relative to the power supply coil Side is enclosed, is formed in the case of vertical view near the 1st of the aerial coil, from the 1st extension of the aerial coil To the outside of the aerial coil, and there is the not region Chong Die with the coil aperture of the aerial coil,

The power supply coil be configured at least with the 1st of the aerial coil other than the 2nd progress magnetic coupling position It sets.

7. electronic equipment according to claim 6, wherein

The shell has conductor portion,

The aerial coil is connected to the conductor portion of the shell.

8. electronic equipment according to claim 6, wherein

The shell has conductor portion,

The planar conductor is the conductor portion of the shell.