JP2018029313A - Wireless communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication apparatus capable of reducing a SAR (Specific Absorption Rate) in a case where a plurality of antennas emit radio waves simultaneously.SOLUTION: A wireless communication apparatus comprises: a substrate that has a first surface facing a human body side at voice communication, and a second surface opposite to the first face; a first antenna arranged at a first end side of the substrate and used for the voice communication or data communication; a second antenna arranged at a second end side opposite to the first end side and used for data communication; a third antenna arranged in the vicinity of the second antenna and used for data communication of a communication system different from that of the second antenna; a switch that has a second terminal and a third terminal connected, in a switchable manner with a first terminal connected with a power feeding point of the second antenna; a matching circuit connected with the second terminal; and an adjustment circuit that is connected with the third terminal, and that adjusts impedance of the second antenna so that the second antenna resonates with the third antenna when the switch connects the first terminal and the third terminal with each other during data communication of the third antenna and performs adjustment so that directivity of the third antenna is directed to the second surface side of the substrate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wireless communication apparatus.

  Conventionally, an antenna, a high-frequency circuit, and a first matching circuit that performs matching so that the antenna and the high-frequency circuit resonate at a transmission frequency when connected to the antenna and the high-frequency circuit are provided. There is a mobile terminal device characterized by the following. A second matching circuit that performs matching so that the antenna and the high-frequency circuit resonate at a reception frequency when connected to the antenna and the high-frequency circuit; and the first matching circuit or the second matching circuit And a switch circuit for connecting any one of the antenna to the antenna and the high-frequency circuit. A proximity sensor that detects an object, and which of the first matching circuit and the second matching circuit the switching circuit connects to the antenna and the high-frequency circuit based on a detection result of the proximity sensor And a control means for controlling (see, for example, Patent Document 1).

JP 2012-239108 A

  By the way, the conventional portable terminal device can reduce the SAR when one antenna radiates radio waves, but does not assume and reduces the SAR when a plurality of antennas radiate simultaneously. I can't do it.

  Therefore, an object of the present invention is to provide a wireless communication apparatus capable of reducing SAR when a plurality of antennas radiate simultaneously.

  A wireless communication device according to an embodiment of the present invention includes a substrate having a first surface facing the human body and a second surface opposite to the first surface when the wireless communication device performs a voice call; The first antenna disposed on the first end side of the board and used for either voice communication or data communication is arranged on the second end side opposite to the first end of the board. And a second antenna used for data communication, a third antenna disposed in the vicinity of the second antenna and used for data communication by a communication method different from the second antenna, and a feeding point of the second antenna A matching circuit connected to the second terminal, a switch having a first terminal connected to the first terminal, a second terminal and a third terminal connected to the first terminal, and a matching circuit connected to the second terminal. When the antenna performs data communication, the switch A matching circuit connected to the third terminal and a matching circuit for setting the resonant frequency of the second antenna to a resonant frequency different from the resonant frequency of the third antenna when the first terminal and the second terminal are connected When the third antenna performs data communication and the switch connects the first terminal and the third terminal, the second antenna resonates with the third antenna. And an adjustment circuit that adjusts the directivity of the third antenna so as to face the second surface side of the substrate.

  It is possible to provide a wireless communication apparatus capable of reducing SAR when a plurality of antennas radiate simultaneously.

1 is a perspective view showing an electronic apparatus 10 including a wireless communication apparatus according to an embodiment. It is a figure which shows the radio | wireless communication apparatus 100 of embodiment. FIG. 6 is a diagram for explaining an operation in the case where voice communication and data communication by a WLAN system are performed in the wireless communication apparatus 100. FIG. 11 is a diagram for explaining an operation when data communication is performed by the radio communication apparatus 100 using the LTE-MIMO method. 2 is a diagram illustrating a simulation model used in electromagnetic field simulation of the wireless communication device 100. FIG. It is a figure which shows a part of the sub antenna 120 and the WLAN antenna 130, the switch 140, the matching circuit 150, the adjustment circuit 160, and the matching circuit 180. It is a figure which shows the directivity obtained with the simulation model.

  Embodiments to which the wireless communication apparatus of the present invention is applied will be described below.

<Embodiment>
FIG. 1 is a perspective view illustrating an electronic apparatus 10 including a wireless communication apparatus according to an embodiment. In the present embodiment, description will be made using an XYZ coordinate system as shown in FIG. A common XYZ coordinate system is also used in other drawings shown below. The XY plan view is referred to as a plan view.

  The electronic device 10 is a smart phone terminal or a mobile phone terminal as an example. The electronic device 10 may be a device having a function for performing a voice call.

  The electronic device 10 includes a touch panel 12 and a display panel 13 that are disposed on one surface (surface on the Z-axis positive direction side) of the housing 11. The touch panel 12 is disposed closer to the Z-axis positive direction side (front side) than the display panel 13. The display panel 13 displays various buttons or sliders using a GUI (Graphic User Interface).

  In addition, the electronic device 10 includes a speaker 14 and a microphone 15 that are disposed on one surface (surface on the Z-axis positive direction side) of the housing 11. A user who makes a voice call using the speaker 14 and the microphone 15 of the electronic device 10 places the speaker 14 on the ear and places the microphone 15 near the mouth.

  FIG. 2 is a diagram illustrating the wireless communication device 100 according to the embodiment.

  The wireless communication apparatus 100 includes a substrate 50, a main antenna 110, a sub antenna 120, a WLAN antenna 130, a switch 140, a matching circuit 150, an adjustment circuit 160, and a control unit 170. In the following, the power source that supplies power to the main antenna 110, the sub antenna 120, and the WLAN antenna 130 is indicated by an AC symbol.

  The substrate 50 is disposed inside the housing 11 (see FIG. 1), and is, for example, an FR4 (Flame Retardant type 4) standard wiring substrate. The substrate 50 has a ground plane 51. Since the ground plane 51 is provided on the surface of the substrate 50 on the Z axis positive direction side, it is indicated by a broken line. The ground plane 51 may be provided on the surface of the substrate 50 on the negative side of the Z axis, or may be provided on the inner layer surface of the substrate 50.

  A main antenna 110, a sub antenna 120, a WLAN antenna 130, a switch 140, a matching circuit 150, and an adjustment circuit 160 are provided on the surface of the substrate 50 on the Z axis negative direction side.

  The main antenna 110 is provided at the end on the Y-axis negative direction side of the surface of the substrate 50 on the Z-axis negative direction side. The main antenna 110 is an example of a first antenna used for either voice communication or data communication. When the user makes a voice call using the speaker 14 and the microphone 15 (see FIG. 1), the electronic device 10 is disposed on the side of the user's head, so the SAR (Specific to the head) is specified. In order to keep the influence of the absorption rate (low absorption rate) low, the main antenna 110 is arranged on the side close to the microphone 15.

  The main antenna 110 is a T-shaped antenna, extends in the Y-axis negative direction from the power feeding unit 111, branches at the branching unit 112, and extends in the X-axis positive direction and the X-axis negative direction to the end portions 113 and 114. doing. The power feeding unit 111 is located near the end of the ground plane 51 on the Y axis negative direction side in plan view. The end portions 113 and 114 are located in the vicinity of the end sides of the substrate 50 on the X-axis positive direction and X-axis negative direction side, respectively.

  The length from the branch part 112 to the end part 114 is longer than the length from the branch part 112 to the end part 113. The L-shaped part from the power feeding part 111 to the end part 114 via the branch part 112 functions as a monopole antenna having a resonance frequency f1. As an example, f1 is 800 MHz.

  The L-shaped part from the power feeding part 111 to the end part 113 via the branch part 112 functions as a monopole antenna having a resonance frequency of f2. As an example, f2 is 2 GHz. Which of f1 and f2 is used is determined on the base station side.

  The main antenna 110 performs communication independently when performing voice communication and data transmission. For example, the main antenna 110 performs WCDMA (registered trademark) (Wideband Code Division Multiple Access: 3G (Generation))-SISO (Single-Input-Single) when performing voice call communication and data transmission communication. -Communication by (Output) method.

  Further, when performing communication for receiving data, the main antenna 110 cooperates with the sub-antenna 120 to perform communication (data reception) using an LTE (Long Term Evolution) -MIMO (Multi-Input Multi-Output) method. I do.

  The sub-antenna 120 is provided at the end on the Y-axis positive direction side of the surface of the substrate 50 on the Z-axis negative direction side. The sub-antenna 120 is an example of a second antenna used exclusively for reception (data reception) of data communication. The sub-antenna 120 performs communication (data reception) using the LTE-MIMO method in cooperation with the main antenna 110. The sub antenna 120 is arranged on the opposite side of the main antenna 110 in the Y axis direction of the substrate 50.

  The sub-antenna 120 is a T-shaped antenna, extends in the Y-axis positive direction from the power feeding unit 121, branches at the branching unit 122, and extends in the X-axis positive direction and the X-axis negative direction to the end portions 123 and 124. doing. The power feeding unit 121 is located near the end of the ground plane 51 on the Y axis positive direction side in plan view. The end portions 123 and 124 are located in the vicinity of the end sides of the substrate 50 on the X-axis positive direction and X-axis negative direction side, respectively.

  The length from the branch part 122 to the end part 124 is longer than the length from the branch part 122 to the end part 123. The L-shaped part from the power feeding part 121 to the end part 124 via the branch part 122 functions as a monopole antenna having a resonance frequency of f1. As an example, f1 is 800 MHz.

  The L-shaped part from the power feeding part 121 through the branch part 122 to the end part 123 functions as a monopole antenna having a resonance frequency of f2. As an example, f2 is 2 GHz. Which of f1 and f2 is used is determined on the base station side.

  The WLAN antenna 130 is an L-shaped monopole antenna and is an example of a third antenna. The WLAN antenna 130 is an antenna that performs data communication (transmission and reception) using a WLAN (Wireless Local Area Network) communication method. The communication frequency of the WLAN antenna 130 is f3 different from the communication frequencies f1 and f2 of the main antennas 110 and 120. As an example, f3 is 5 GHz.

  The WLAN antenna 130 extends in the Y-axis positive direction from the power supply unit 131, is bent to the X-axis negative direction side by the bending unit 132, and extends to the end 133 in the X-axis negative direction. The power feeding unit 131 is located near the end of the ground plane 51 on the Y axis positive direction side in plan view. The section between the bent part 132 and the end part 133 is parallel to the section between the branch part 122 and the end part 124 of the sub antenna 120 with a predetermined interval (for example, 5 mm). The end portion 133 is located in the vicinity of the end side of the substrate 50 on the X axis negative direction side.

  The switch 140 is a switch having three terminals 141, 142, and 143, and switches the connection destination of the terminal 141 to either the terminal 142 or 143. The switch 140 is switched by the control unit 170. The terminal 141 is an example of a first terminal, the terminal 142 is an example of a second terminal, and the terminal 143 is an example of a third terminal.

  The terminal 141 is connected to the power feeding unit 121, the terminal 142 is connected to the matching circuit 150, and the terminal 143 is connected to the adjustment circuit 160. For this reason, the connection destination of the power feeding unit 121 is switched to either the matching circuit 150 or the adjustment circuit 160 by the switch 140.

  The matching circuit 150 is connected to the sub antenna 120 by the switch 140 when the sub antenna 120 receives data, and matches the communication frequency of the sub antenna 120 to f1 and f2. The sub-antenna 120 is not coupled to the WLAN antenna 130 when communicating at the communication frequencies f1 and f2.

  The adjustment circuit 160 adjusts the impedance of the sub antenna 120 so that the sub antenna 120 resonates with the WLAN antenna 130 when the switch 140 connects the sub antenna 120 and the adjustment circuit 160 when the WLAN antenna 130 performs data communication. At the same time, the directivity of the WLAN antenna 130 is adjusted to face the Z-axis negative direction.

  The adjustment circuit 160 includes an inductance or a capacitance, and when connected to the sub antenna 120 by the switch 140, the adjustment circuit 160 adjusts the resonance frequency of the sub antenna 120 to the communication frequency f3 of the WLAN antenna 130. As described above, the resonance frequency of the sub-antenna 120 is adjusted to f3 by the adjustment circuit 160, whereby the sub-antenna 120 and the WLAN antenna 130 can be coupled to control the directivity. Note that in order to match the resonance frequency of the sub-antenna 120 to the communication frequency f3, either the fundamental wave or the harmonic of the resonance frequency of the sub-antenna 120 may be adjusted to the communication frequency f3. For this reason, for example, the sub antenna 120 and the WLAN antenna 130 can be resonated by reducing one of the harmonics of the sub antenna 120 to 5 GHz.

  The Z-axis negative direction side is the side opposite to the side where the speaker 14 and the microphone 15 of the electronic device 10 (see FIG. 1) are present. That is, the side opposite to the side where the touch panel 12 and the display panel 13 of the electronic device 10 are present (the back side of the electronic device 10).

  The directivity of the sub-antenna 120 and the WLAN antenna 130 is directed toward the negative Z-axis direction means that the directivity distribution of the sub-antenna 120 and the WLAN antenna 130 is biased toward the negative Z-axis direction, or The directivity of the antenna 130 is to have a null point on the Z axis positive direction side. The adjustment of directivity distribution will be described later.

  The control unit 170 is realized by a CPU (Central Processing Unit) as an example. For example, the control unit 170 is realized as part of the function of a CPU that controls high-frequency wireless communication of the electronic device 10.

  For this reason, the control unit 170 receives a signal indicating a mode in which the wireless communication apparatus 100 performs a voice call and a signal indicating a mode in which data communication is performed using the LTE-MIMO method. The controller 170 switches the switch 140 based on these signals.

  The control unit 170 connects the terminals 141 and 142 when the sub antenna 120 receives data. Thereby, the sub-antenna 120 and the matching circuit 150 are connected. Further, the control unit 170 connects the terminals 141 and 143 when the WLAN antenna 130 performs data communication. Thereby, the sub-antenna 120 and the adjustment circuit 160 are connected.

  FIG. 3 is a diagram for explaining operations when the wireless communication apparatus 100 performs voice communication and data communication by the WLAN system. 3A shows a connection state of the switch 140 in the wireless communication apparatus 100, and FIG. 3B shows a state where the user holds the electronic device 10 in the left hand and puts the speaker 14 on the left ear. This shows a state in which a telephone call is made and data communication is performed by the WLAN system. 3B schematically shows the electronic device 10, the wireless communication device 100, the main antenna 110, the sub antenna 120, and the WLAN antenna 130.

  A voice call is performed by communication using the main antenna 110. When performing data communication by the WLAN system, as shown in FIG. 3A, the switch 140 connects the power feeding unit 121 of the sub antenna 120 and the adjustment circuit 160 to connect the sub antenna 120 to the WLAN antenna 130. The directivity is controlled by resonating at the communication frequency f3. Therefore, as shown in FIG. 3B, the directivity of the WLAN antenna 130 (using the sub-antenna 120 and the adjustment circuit 160) faces the back side of the electronic device 10 as indicated by an ellipse and an arrow. Therefore, the influence of SAR on the head is reduced.

  Here, when performing voice call communication using the main antenna 110, since the radio wave is radiated below the head (the part below the mouth), the influence of the SAR is reduced, which is problematic. Must not. This is the same when only the voice call communication is performed using the main antenna 110.

  FIG. 4 is a diagram illustrating an operation when data communication is performed by the wireless communication apparatus 100 using the LTE-MIMO method. 4A shows a connection state of the switch 140 in the wireless communication apparatus 100, and FIG. 4B shows that the user holds the electronic device 10 on the left hand and uses the main antennas 110 and 120. The state which is performing data communication by a LTE-MIMO system is shown. In FIG. 4B, since the user is not making a voice call, the electronic device 10 is not placed on the ear and is away from the head and in front of the user (on hand).

  When performing data communication using the LTE-MIMO method, the switch 140 connects the power feeding unit 121 of the sub-antenna 120 and the matching circuit 150 as illustrated in FIG. As a result, the sub-antenna 120 becomes communicable at the resonance frequencies f1 and f2. Data communication in the LTE-MIMO scheme is realized by the main antenna 110 and the sub-antenna 120.

  In a state where the user holds the electronic device 10 in the hand and performs data communication by a plurality of communication methods of the LTE-MIMO method and the WLAN method, radio waves are radiated from the main antenna 110 and the WLAN antenna 130. Since 10 is away from the human body, the influence of SAR is not a problem.

  FIG. 5 is a diagram illustrating a simulation model used in the electromagnetic field simulation of the wireless communication device 100. FIG. 6 is a diagram illustrating a part of the sub-antenna 120 and the WLAN antenna 130, the switch 140, the matching circuit 150, the adjustment circuit 160, and the matching circuit 180. FIG. 6 is a diagram in which a switch 140, a matching circuit 150, an adjustment circuit 160, and a matching circuit 180 are added to an enlarged view of a part of the sub antenna 120 and the WLAN antenna 130 in the simulation model shown in FIG.

  The matching circuit 180 is a circuit for matching the impedance of the WLAN antenna 130, and includes a capacitor or an inductor. Although the matching circuit 180 is not shown in FIGS. 2 to 4, as shown in FIG. 5, the matching circuit 180 may be appropriately inserted between the power feeding unit 131 of the WLAN antenna 130 and the ground plane 51A.

  FIG. 5 shows the ground plane 51A, the sub-antenna 120, the WLAN antenna 130, and the adjustment circuit 160. The ground plane 51A is a conductor having a width in the X-axis direction of 50 mm and a length in the Y-axis direction of 100 mm. In the simulation model shown in FIG. 5, the ground plane 51A is a flat conductor parallel to the XZ plane. The adjustment circuit 160 is provided between the ground plane 51A and the sub-antenna 120.

  As shown in FIG. 6, the length between the power feeding part 131 and the bending part 132 of the WLAN antenna 130 is 5 mm. The length of the section where the section between the branching section 122 and the end section 124 of the sub antenna 120 and the section between the bent section 132 and the end section 133 of the WLAN antenna 130 extend in parallel in the X-axis direction is 13 mm. It is. For this reason, the length of the WLAN antenna 130 is 18 mm. The end portion 124 is located on the X axis negative direction side with respect to the end portion 133.

  Further, the interval in the Y-axis direction between the section between the branching section 122 and the end section 124 of the sub antenna 120 and the section between the bent section 132 and the end section 133 of the WLAN antenna 130 is 5 mm.

The adjustment circuit 160 is composed of an inductor, and when connected to the sub-antenna 120 by the switch 140, reduces the frequency of one of the harmonics of the sub-antenna 120 to 5 GHz. Using the simulation model as described above, the switch 140 When the directivity of the WLAN antenna 130 was determined in a state where the sub antenna 120 and the adjustment circuit 160 were connected to each other, the directivity as shown in FIG. 7 was obtained.

  FIG. 7 is a diagram showing the directivity obtained by the simulation model. In FIG. 7, the directivity of the WLAN antenna 130 in a state where the sub antenna 120 and the adjustment circuit 160 are connected by the switch 140 is indicated by a broken line.

  For comparison, the directivity of the WLAN antenna 130 in a state where the sub antenna 120 and the matching circuit 150 are connected by the switch 140 is indicated by a solid line. In a state where the sub antenna 120 and the matching circuit 150 are connected by the switch 140, the sub antenna 120 and the WLAN antenna 130 do not resonate.

  As shown in FIG. 7, the directivity indicated by the solid line for comparison is substantially uniform on the YZ plane. On the other hand, the directivity indicated by the broken line has a gain larger on the Z-axis negative direction side than the directivity indicated by the solid line, and has a null point on the Z-axis positive direction side. For this reason, it has confirmed that the directivity of the WLAN antenna 130 was facing the Z-axis negative direction side.

  As described above, according to the embodiment, when the WLAN antenna 130 performs data communication, the switch 140 connects the sub antenna 120 and the adjustment circuit 160, and the sub antenna 120 resonates with the WLAN antenna 130. Is adjusted so that the directivity of the WLAN antenna 130 faces the negative Z-axis direction.

  For this reason, even when the wireless communication device 100 performs data communication for voice communication using the main antenna 110, even if the WLAN antenna 130 performs data communication using the WLAN system, the directivity of the WLAN antenna 130 is not changed. Since it can be switched to face the back side (the direction away from the head), SAR can be reduced.

  Therefore, it is possible to provide radio communication apparatus 100 that can reduce SAR when a plurality of antennas radiate simultaneously.

  Conventionally, there is a case where the output is reduced in order to reduce the SAR. However, even if the SAR is reduced by such a method, the radiation characteristic is deteriorated, so that the essential problem is solved. It has not reached.

  In such a case, the wireless communication device 100 according to the first embodiment switches the directivity of the WLAN antenna 130 to face the back side of the wireless communication device 100, thereby reducing the SAR without reducing the output. be able to.

  The communication frequencies of the main antenna 110, the sub-antenna 120, and the WLAN antenna 130 described above are merely examples, and each part of the main antenna 110, the sub-antenna 120, and the WLAN antenna 130 is used even when communicating at communication frequencies other than those described above. This can be dealt with by changing the dimensions and the like.

  In the above, the WLAN antenna 130 is shown as an example of the third antenna. However, the WLAN antenna 130 may be used as an antenna for a communication method other than WLAN.

Further, the dimensions of the sub antenna 120 and the WLAN antenna 130 shown in FIG. 6 are an example. The length of the section where the section between the branching section 122 and the end section 124 of the sub antenna 120 and the section between the bent section 132 and the end section 133 of the WLAN antenna 130 extend in parallel in the X-axis direction is: It is not limited to 13 mm. When a wavelength in the communication frequency f3 of the WLAN antenna 130 and lambda _3, the length of the section which extends in parallel, for example, λ ₃ × (2/3) or more, as long as λ ₃ × (4/5) hereinafter Good. Further, the interval in the Y-axis direction of the sections extending in parallel may be about λ ₃ × (1/4) or more and λ ₃ × (1/3) or less.

  In the above, the form in which the wireless communication apparatus 100 includes the main antenna 110 has been described. However, an apparatus that does not include the main antenna 110 may be regarded as the wireless communication apparatus 100.

  In the above description, the adjustment circuit 160 includes an inductor and the frequency of one of the harmonics of the sub antenna 120 is reduced to 5 GHz so that the sub antenna 120 and the WLAN antenna 130 resonate.

  However, the adjustment circuit 160 may adjust the resonance frequency of the sub-antenna 120 to be equal to the resonance frequency of the WLAN antenna 130. In such a case, the adjustment circuit 160 may include an inductor or a capacitor so that the resonance frequency of the sub-antenna 120 can be adjusted as appropriate.

The wireless communication apparatus according to the exemplary embodiment of the present invention has been described above. However, the present invention is not limited to the specifically disclosed embodiment and does not depart from the scope of the claims. Various modifications and changes are possible.
Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A wireless communication device,
A board having a first surface facing the human body and a second surface opposite to the first surface when the wireless communication device performs a voice call;
A first antenna disposed on the first end side of the substrate and used for either voice communication or data communication;
A second antenna disposed on a second end side opposite to the first end of the substrate and used for data communication;
A third antenna disposed in the vicinity of the second antenna and used for data communication by a communication method different from the second antenna;
A switch having a first terminal connected to a feeding point of the second antenna, and a second terminal and a third terminal connected to the first terminal in a switchable manner;
A matching circuit connected to the second terminal, wherein when the second antenna performs data communication, the switch connects the first terminal and the second terminal, and the resonance frequency of the second antenna is set. A matching circuit that is set to a resonance frequency different from the resonance frequency of the third antenna;
An adjustment circuit connected to the third terminal, wherein the second antenna is connected to the third terminal when the switch connects the first terminal and the third terminal when the third antenna performs data communication. An adjustment circuit that adjusts the impedance of the second antenna so as to resonate with the antenna and adjusts the directivity of the third antenna so as to face the second surface of the substrate.
(Appendix 2)
The third antenna has a null point on the first surface side of the substrate and the directivity distribution is adjusted by the adjustment circuit so as to have a peak on the second surface side. The wireless communication device according to appendix 1, wherein directivity is adjusted so as to face the second surface side of the substrate.
(Appendix 3)
The adjustment circuit has an inductor;
When the impedance of the second antenna is adjusted by the inductor, the harmonic frequency of the resonance frequency of the second antenna is lowered to be equal to the frequency of the third antenna. The wireless communication device according to appendix 1 or 2, which resonates with an antenna.
(Appendix 4)
The wireless communication device according to any one of appendices 1 to 3, wherein the second antenna and the third antenna have sections arranged in parallel at a predetermined interval.
(Appendix 5)
The wireless communication device according to any one of appendices 1 to 4, wherein the first antenna and the second antenna construct a MIMO antenna when performing data communication.
(Appendix 6)
The wireless communication device according to any one of appendices 1 to 5, wherein the third antenna is an antenna for a wireless LAN.
(Appendix 7)
A wireless communication device,
A board having a first surface facing the human body and a second surface opposite to the first surface when the wireless communication device performs a voice call;
A first antenna disposed on the substrate and used for data communication;
A second antenna disposed in the vicinity of the first antenna and used for data communication by a communication method different from the first antenna;
A switch having a first terminal connected to a feeding point of the first antenna, and a second terminal and a third terminal connected to the first terminal in a switching manner;
A matching circuit connected to the second terminal, wherein when the first antenna performs data communication, the switch connects the first terminal and the second terminal, and the resonance frequency of the first antenna is set. A matching circuit that is set to a resonance frequency different from the resonance frequency of the second antenna;
An adjustment circuit connected to the third terminal, wherein when the second antenna performs data communication and the switch connects the first terminal and the third terminal, the resonance frequency of the first antenna is set. An adjustment circuit that adjusts to be equal to a resonance frequency of the second antenna and adjusts directivity of the first antenna and the second antenna so as to face the second surface side of the substrate. Communication device.

DESCRIPTION OF SYMBOLS 10 Electronic device 50 Board | substrate 51 Ground plane 100 Wireless communication apparatus 110 Main antenna 111 Feed part 112 Branch part 113, 114 End part 120 Subantenna 121 Feed part 122 Branch part 123, 124 End part 130 WLAN antenna 131 Feed part 132 Bending part 133 End 140 Switch 141, 142, 143 Terminal 150 Matching circuit 160 Adjustment circuit 170 Control unit 180 Matching circuit

Claims (6)

A wireless communication device,
A board having a first surface facing the human body and a second surface opposite to the first surface when the wireless communication device performs a voice call;
A first antenna disposed on the first end side of the substrate and used for either voice communication or data communication;
A second antenna disposed on a second end side opposite to the first end of the substrate and used for data communication;
A third antenna disposed in the vicinity of the second antenna and used for data communication by a communication method different from the second antenna;
A switch having a first terminal connected to a feeding point of the second antenna, and a second terminal and a third terminal connected to the first terminal in a switchable manner;
A matching circuit connected to the second terminal, wherein when the second antenna performs data communication, the switch connects the first terminal and the second terminal, and the resonance frequency of the second antenna is set. A matching circuit that is set to a resonance frequency different from the resonance frequency of the third antenna;
An adjustment circuit connected to the third terminal, wherein the second antenna is connected to the third terminal when the switch connects the first terminal and the third terminal when the third antenna performs data communication. An adjustment circuit that adjusts the impedance of the second antenna so as to resonate with the antenna and adjusts the directivity of the third antenna so as to face the second surface of the substrate.   The third antenna has a null point on the first surface side of the substrate and the directivity distribution is adjusted by the adjustment circuit so as to have a peak on the second surface side. The wireless communication device according to claim 1, wherein directivity is adjusted so as to face the second surface side of the substrate. The adjustment circuit has an inductor;
When the impedance of the second antenna is adjusted by the inductor, the harmonic frequency of the resonance frequency of the second antenna is lowered to be equal to the frequency of the third antenna. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus resonates with an antenna.   4. The wireless communication apparatus according to claim 1, wherein the second antenna and the third antenna have sections arranged in parallel at a predetermined interval. 5.   The radio communication apparatus according to any one of claims 1 to 4, wherein the first antenna and the second antenna construct a MIMO antenna when performing data communication.   The wireless communication apparatus according to claim 1, wherein the third antenna is a wireless LAN antenna.

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