JP7247614B2 - Antenna device and wireless communication device - Google Patents

Description

The present invention relates to an antenna device and a wireless communication device.

Conventionally, two conductor surfaces arranged at positions facing each other with a space therebetween, a plurality of connection conductors connecting the two conductor surfaces at at least two locations, and at least one of the plurality of connection conductors. and an antenna coil arranged close to a connection conductor.

A closed loop having an opening is formed by two connecting conductors among the plurality of connecting conductors and the two conductor surfaces, and the antenna coil is arranged on the opening surface when the opening surface of the closed loop is viewed in plan. and at a position where an induced current flows through the connection conductor due to electromagnetic induction of the antenna coil (see, for example, Patent Document 1).

International Publication No. 2014-199861

By the way, in the conventional antenna device, when another conductor is arranged so as to overlap at least one of the two conductor surfaces, the radiation characteristic changes due to the current flowing through the other conductor, and the desired communication frequency is obtained. communication characteristics may deteriorate.

Therefore, it is an object of the present invention to provide an antenna device and a wireless communication device that can obtain good communication characteristics even when placed near a conductor.

An antenna device according to an embodiment of the present invention comprises: a first metal plate held at ground potential; an antenna element; a second metal plate disposed on a side opposite to the first metal plate with respect to the antenna element and overlapping the first metal plate in plan view; the first metal plate and the second metal plate; and a substrate on which the antenna element is provided on one surface and the first metal plate is provided on an inner layer or the other surface, wherein the connection portion is an end of the substrate. It is provided over a section of a part of the side, and the antenna element is provided along the edge in a section of the edge other than the section in which the connecting portion is provided.

It is possible to provide an antenna device and a wireless communication device that can obtain good communication characteristics even when placed near a conductor.

1 shows a wireless communication device 200 including an antenna device 100 according to an embodiment; FIG. 2 is a diagram showing part of the antenna device 100. FIG. 2 is a diagram showing part of the antenna device 100. FIG. 2 is a diagram showing a state in which a communication device 50 is attached to a wireless communication device 200; FIG. 4 is a diagram showing each parameter of a simulation model of the antenna device 100; FIG. 4 is a diagram showing frequency characteristics of the S11 parameter of the antenna device 100; FIG. 3 is a diagram showing the directivity of the antenna device 100; FIG. 3 is a diagram showing an analysis model of the antenna device 100; FIG. 3 is a diagram showing an analysis model of the antenna device 100; FIG. FIG. 4 is a diagram showing the total efficiency of the antenna device 100 when the distance a and thickness t are changed;

Embodiments to which the antenna device and wireless communication device of the present invention are applied will be described below.

<Embodiment>
FIG. 1 is a diagram showing a wireless communication device 200 including an antenna device 100 according to an embodiment. The XYZ coordinate system will be used in the following description. Also, hereinafter, for convenience of explanation, the −Z direction side is referred to as the lower side or the lower side, and the +Z direction side is referred to as the upper side or the upper side, but this does not represent a universal vertical relationship. Moreover, planar view means XY plane view.

Radio communication device 200 includes antenna device 100 , communication section 210 , and control section 220 . The wireless communication device 200 also includes a housing for housing the antenna device 100, the communication unit 210, and the control unit 220, but they are omitted here.

2 to 4 in addition to FIG. 1 will be used. 2 and 3 are diagrams showing a part of the antenna device 100. FIG. FIG. 4 is a diagram showing a state in which the communication device 50 is attached to the wireless communication device 200. As shown in FIG. In FIG. 4, the outline of the communicator 50 is indicated by a dashed line.

Antenna device 100 includes circuit board 110 , substrate 120 , antenna element 130 , connection pin 140 , metal plate 150 , connection portion 160 and connector 170 . In FIG. 2, the circuit board 110, the connector 170, the communication section 210, and the control section 220 are omitted. In FIG. 3, the metal plate 150 and the connecting portion 160 are also omitted.

The circuit board 110 is, for example, a FR-4 (Flame Retardant type 4) standard wiring board, and has a structure in which a ground layer 110A, a plurality of insulating layers, and a plurality of wiring layers are laminated. The ground layer 110A and the plurality of insulating layers are, for example, rectangular in plan view.

The circuit board 110 has four edges 111 , 112 , 113 , 114 . The edge 111 extends in the Y direction on the +X direction side, the edge 112 extends in the X direction on the +Y direction side, and the edge 113 extends in the X direction on the -Y direction side. , and edge 114 extends in the -X direction in the Y direction. The edge 111 is an example of a first edge, and the edge 114 is an example of a second edge.

The ground layer 110A is held at ground potential. The ground layer 110A has substantially the same size as the circuit board 110 in plan view. Having substantially the same size means having substantially the same size with a slight offset from the edge of the insulating layer.

Also, here, as an example, the ground layer 110A is assumed to be in the inner layer. Note that the ground layer 110A may be on any layer of the circuit board 110 . The ground layer 110A is an example of a first metal plate.

The board 120 is arranged on the +Z direction side of the circuit board 110 at a position overlapping the circuit board 110 in plan view. An antenna element 130 is provided on the surface (lower surface) on the −Z direction side of the substrate 120, and a metal plate 150 is provided on the surface (upper surface) on the +Z direction side. The substrate 120 may be a plate-like member made of an insulator, and as an example, an FR-4 standard wiring substrate can be used. Also, the substrate 120 may be part of the housing of the wireless communication device 200 .

Antenna element 130 is a monopole inverted F-shaped antenna element, and has feeding portion (feeding point) 131 , branch portion 132 , bent portion 133 , open end 134 , bent portions 135 and 136 , and connection end 137 . Antenna element 130 is made of copper as an example.

The power supply unit 131 is connected to the communication unit 210 via the power supply line 211 . Power is supplied to the power supply unit 131 from the communication unit 210 through the power supply line 211 . The position of the power supply portion 131 in a plan view is a position slightly offset in the -X direction side and the +Y direction side from the +X direction side and -Y direction side corners of the substrate 120 .

The feeder line 211 is realized by, for example, a wiring included in the circuit board 110 and a core wire of a coaxial cable connecting between the wiring of the circuit board 110 and the feeding section 131 . A line having a characteristic impedance that matches the impedance of the antenna element 130, such as a microstrip line, can be used for the portion of the wiring included in the circuit board 110 in the feed line 211, for example. Further, a matching element may be connected to the feeding section 131 to match the impedance with the feeding line 211 . A capacitor and/or a coil may be used as the matching element.

The antenna element 130 includes a line extending in the +Y direction from the feeding portion 131, being bent in the −X direction at the bending portion 133 and extending to the open end 134, and a line extending in the −X direction from the branch portion 132 and being bent. and lines that are bent in the −Y direction and the +X direction at portions 135 and 136 and extend to the connection end 137 .

The position of the bent portion 133 in plan view is slightly offset in the −X direction from the corners of the +X direction side and the +Y direction side of the substrate 120 , and the position in the X direction is the same as that of the feeding portion 131 . The position of the open end 134 in plan view is equal to the positions of the corners of the substrate 120 on the −X direction side and the +Y direction side. The positions of the bent portions 136 in plan view are equal to the positions of the corners of the substrate 120 on the −X direction side and the −Y direction side. The position of the bent portion 135 in plan view is offset from the position of the bent portion 136 in the +Y direction. The position of the connection end 137 in a plan view is equal to the positions of the corners of the substrate 120 on the +X direction side and the −Y direction side.

The length of the line extending from the feeding portion 131 to the open end 134 via the bent portion 133 is set to a length corresponding to ¼ of the electrical length of the wavelength at the predetermined resonance frequency of the antenna element 130 .

The length corresponding to 1/4 of the electrical length of the wavelength at the predetermined resonance frequency is not strictly limited to 1/4 of the electrical length of the wavelength at the predetermined resonance frequency. It includes the length that is slightly shorter than 1/4 of the electrical length of the wavelength at the predetermined resonance frequency in the adjustment for functioning as an inverted F antenna that resonates at the frequency.

A line (short-circuit line) extending from the branch portion 132 to the connection end 137 via the bent portions 135 and 136 is connected to the ground layer 110A of the circuit board 110 at the connection end 137 via the connection pin 140 .

In such an antenna element 130, a section between the feeding portion 131 and the bent portion 133 extends along the edge 121 extending in the Y direction on the +X direction side of the substrate 120. A section between the open end 134 extends along the edge 122 extending in the Y direction on the +X direction side of the substrate 120 . A section between the bent portion 136 and the connection end 137 extends along the edge 123 extending in the X direction on the −Y direction side of the substrate 120 .

Since the substrate 120 and the metal plate 150 have the same size in plan view, the antenna element 130 has an edge extending in the Y direction on the +X direction side of the metal plate 150 in the section between the feeding portion 131 and the bent portion 133. 151 , and a section between the bent portion 133 and the open end 134 extends along the edge 152 extending in the Y direction on the +X direction side of the metal plate 150 . A section between the bent portion 136 and the connection end 137 extends along the edge 153 extending in the X direction on the -Y direction side of the metal plate 150 .

The four sides (edge sides 121 to 124, 151 to 154) of the substrate 120 and the metal plate 150 are parallel to the four sides (four edge sides) of the circuit board 110. FIG. Therefore, in relation to the circuit board 110 , the antenna element 130 has a section between the feeding portion 131 and the bent portion 133 extending along the edge 111 , and a section between the bent portion 133 and the open end 134 . The interval between extends along edge 112 . A section between the bent portion 136 and the connecting end 137 extends along the edge 113 . Thus, the antenna elements 130 are arranged along the edges 111 , 112 and 113 of the circuit board 110 . This is to reduce the influence of the connector 170 and the communication device 50 on the antenna element 130 by arranging the antenna element 130 as far away as possible from the connector 170 arranged near the edge 114 .

The connection pin 140 is a conductive pin that connects the connection end 137 to the ground layer 110A of the circuit board 110 . The contact pins 140 can be made of copper or solder as an example.

The metal plate 150 is provided on the upper surface (surface on the +Z direction side) of the substrate 120 and has the same size as the substrate 120 in plan view. The metal plate 150 is connected to the ground layer 110A of the circuit board 110 by the connecting portion 160 and held at the ground potential. The metal plate 150 may be made of any metal as long as it is made of metal, and is made of copper as an example. Metal plate 150 is an example of a second metal plate.

The connection portion 160 is connected to a section on the +Y direction side of the edge 154 extending in the Y direction on the −X direction side of the metal plate 150 . The connecting portion 160 may be made of a conductor, and may be a member capable of connecting the ground layer 110A of the circuit board 110 and the metal plate 150 .

Connection portion 160 is located closer to antenna element 130 than connector 170 . The open end 134 of the antenna element 130 is closest to the connecting portion 160 . The reason for such an arrangement is to couple the antenna element 130 and the connection portion 160 so that a current also flows through the metal plate 150 . If the antenna element 130 and the connection part 160 are coupled and the current also flows through the metal plate 150, even if the communication device 50 (see FIG. 4) is attached to the connector 170, the current flow to the communication device 50 can be suppressed. is.

The connecting portion 160 may be configured by bending a metal layer into a portion parallel to the XY plane and a portion parallel to the YZ plane as shown in FIG. 2, or may be a plurality of metal pins or the like. The connection part 160 is made of metal such as copper as an example.

As shown in FIG. 1, the connector 170 is arranged on the −X direction side of the connecting portion 160 and connected to the ground layer 110A and the wiring layer of the circuit board 110 . A terminal 171 of the connector 170 protrudes in the +Z direction, and is connected to a connector of the communication device 50 that can be arranged on the upper side of the metal plate 150 . The connector 170 may be of any type as long as it conforms to the connector on the communication device 50 side. The communication device 50 is larger than the rectangular area in plan view where the antenna element 130 is arranged (area equal to the size of the substrate 120 in plan view). The communication device 50 communicates at a communication frequency different from that of the antenna device 100 . Here, the communication frequency of the antenna device 100 is a frequency equal to the resonance frequency of the antenna device 100 or a frequency included in a frequency band around the resonance frequency of the antenna device 100 in which the antenna device 100 can communicate.

The communication unit 210 is mounted on the upper surface of the circuit board 110 , connected to the power supply unit 131 of the antenna element 130 via the power supply line 211 , and connected to the control unit 220 via wiring of the circuit board 110 . The communication unit 210 includes, for example, a DUP (Duplexer), an LNA (Low Noise Amplifier)/PA (Power Amplifier), a modulator/demodulator, and the like, and transmits a transmission signal transmitted from the antenna element 130 and a signal received by the antenna element 130. signal processing such as amplification or noise removal with the received signal.

The control unit 220 is mounted on the upper surface of the circuit board 110 and connected to the communication unit 210 via wiring of the circuit board 110 . The control unit 220 performs input/output control of transmission signals and reception signals.

FIG. 5 is a diagram showing each parameter of the simulation model of the antenna device 100. As shown in FIG. In FIG. 5, the ground layer 110A and the antenna element 130 are simply shown as one block. Port 1 is the feeding section 131 . 5 also shows a capacitor 2 and an inductor 3 as a matching circuit. As an example, the capacitance of capacitor 2 is 2 pF and the inductance of inductor is 2.3 nH. Capacitor 2 and inductor 3 are examples of matching elements. Wave source 1 is a high-frequency source that supplies high-frequency power to feeding section 131 (port 1), and has an internal impedance of 50Ω.

In the simulation model, the condition was that the ground layer 110A extends infinitely in the X and Y directions. Also, conductors such as the ground layer 110A and the antenna element 130 are made of copper. Using such a simulation model, an electromagnetic field simulation was performed to obtain the radiation characteristics of the antenna device 100 .

FIG. 6 is a diagram showing frequency characteristics of the S11 parameter of the antenna device 100. As shown in FIG. The horizontal axis represents frequency, and indicates a range from −45 MHz to +55 MHz with respect to the resonance frequency f0 of the antenna device 100. FIG. The vertical axis is the S11 parameter, the uppermost scale is 0 dB, and values of 0 dB or less are not shown, and only scales at regular intervals are shown.

The characteristics indicated by the solid line were obtained under the condition that the communication device 50 was not attached to the connector 170 . Also, the characteristics indicated by the dashed line were obtained under the condition that the communication device 50 was attached to the connector 170 .

Under the condition that the communication device 50 was attached to the connector 170 , a metal plate made of copper was arranged on the +Z direction side of the metal plate 150 . The metal plate as the communication device 50 has the same size as the circuit board 110 . Since the communication device 50 includes a ground layer and other metal members, a metal plate satisfying these conditions is used instead.

As shown by the solid line in FIG. 6, it was confirmed that under the condition that the communication device 50 was not attached to the connector 170, the reflection coefficient was low enough to allow good communication around the resonance frequency f0. Further, as indicated by the dashed line, under the condition that the communication device 50 is attached to the connector 170, the reflection coefficient is low enough to enable sufficiently good communication around the resonance frequency f0, and the reflection coefficient is lower than the characteristic indicated by the solid line. It was confirmed that the coefficient was low.

Even the characteristics indicated by the solid line are at a level at which satisfactory communication can be performed. Therefore, even if the metal plate is placed on the +Z direction side of the metal plate 150, the antenna device 100 can be confirmed to have good communication characteristics. rice field.

FIG. 7 is a diagram showing the directivity of the antenna device 100. As shown in FIG. FIG. 7A shows the directivity obtained under the condition that the communication device 50 is not attached to the connector 170, and FIG. 7B shows the directivity obtained under the condition that the communication device 50 is attached to the connector 170. Indicates directivity. Also, FIGS. 7A and 7B show the directivity in the YZ plane. Since the YZ plane is the so-called horizontal plane of the antenna element 130, the directivity shown in FIGS. 7A and 7B is the directivity in the horizontal plane.

As shown in FIGS. 7A and 7B, the antenna device 100 has substantially the same directivity even when the connector 170 is not attached with the communication device 50 and when the connector 170 is attached with the communication device 50. omnidirectionality in the horizontal plane. That is, it was found that the directivity of the antenna device 100 is very little affected even when the communication device 50 is arranged above the metal plate 150 .

8 and 9 are diagrams showing analytical models of the antenna device 100. FIG. A metal plate 51 corresponding to the ground layer of the communication device 50 is connected to the connector 170 of the antenna device 100 of the analysis model shown in FIGS.

Also, as shown in FIG. 9, the thickness of the substrate 120 is t, and the distance (interval) in the Z direction between the antenna element 130 and the ground layer 110A is a.

When the distance L was fixed and the distance a and the thickness t were changed, the results shown in FIG. 10 were obtained. FIG. 10 is a diagram showing the total efficiency (radiation efficiency when the impedance of the antenna element 130 is perfectly matched) when the distance a and the thickness t are changed. Here, the distance a, thickness t, and radiation efficiency are indicated by normalized values of A, T, and E, respectively.

As shown in FIG. 10, it was found that the greater the thickness t, the more the radiation efficiency improved, and the greater the thickness t, the smaller the range of improvement. Moreover, it was found that the radiation efficiency is improved when the distance a is large. That is, it was found that the radiation efficiency is improved as the distance a and the thickness t are increased.

The highest radiation efficiency of about -1.5E was obtained when the distance a was 3.35A and the thickness t was 6.4T.

As described above, in the antenna device 100, the +Z direction side of the metal plate 150 ( Even if the metal plate 51 (see FIG. 8) was arranged on the upper side), the communication characteristics did not deteriorate, and good communication characteristics could be obtained. The metal plate 51 imitates the communication device 50 in the electromagnetic field simulation.

Therefore, it is possible to provide the antenna device 100 and the wireless communication device 200 that can obtain good communication characteristics even when placed near a conductor.

Therefore, the electronic device including the wireless communication device 200 and the communication device 50 can communicate with the wireless communication device 200 including the antenna device 100 in a good communication state, and can communicate with the communication device 50. can.

In the antenna device 100, the space in which the communication device 50 may be arranged with respect to the antenna element 130 is on the +Z direction side (upper side). In addition, here, as an example, the metal plate 150 overlaps the entire antenna element 130 in plan view.

Further, the antenna element 130 is positioned so as not to overlap the connection portion 160 in plan view with respect to the connection portion 160 that connects the ground layer 110A and the metal plate 150, and the power supply portion 131 is positioned so as to overlap the connection portion 160 in plan view. are arranged so as to be positioned diagonally in the rectangular shape of the substrate 120 .

The antenna element 130 is arranged along the edges of the substrate 120 and the metal plate under such restrictions on the positional relationship between the metal plate 150 and the connection portion 160 .

With this arrangement, even if the antenna element 130 is arranged below the metal plate 150, the space blocked by the metal plate 150 is minimized, and the antenna element 130 can radiate without being blocked by the metal plate 150. Space is reserved.

Therefore, the antenna device 100 can obtain good radiation efficiency (see FIG. 7) in the horizontal plane.

By providing the metal plate 150 on the +Z direction side of the antenna element 130, good communication characteristics can be achieved regardless of whether or not the communication device 50 is connected to the connector 170 (whether or not the communication device 50 is on the +Z direction side of the antenna element 130). is obtained for the following reasons. This is because a current also flows through the metal plate 150 when the antenna element 130 radiates, thereby blocking the flow of current to the communication device 50 even if the communication device 50 is attached to the connector 170 . Such a principle has been confirmed in simulations by the fact that almost no current flows through the metal plate 51 imitating the communication device 50 .

Therefore, it is desirable to arrange the connecting portion 160 closer to the antenna element 130 than the connector 170 is. By arranging the connection portion 160 and the antenna element 130 to be strongly coupled, even if the communication device 50 is connected to the connector 170 , it is possible to suppress current from flowing through the communication device 50 . As a result, the antenna device 100 can obtain good communication characteristics regardless of the presence or absence of a communication device.

In the above description, the antenna element 130 has an inverted F shape, but the antenna element 130 may be a monopole antenna element such as an inverted L shape or a meandering shape. The connecting pin 140 is not required if the inverted L-shape or meandering shape is used.

Also, when the antenna element 130 is of an inverted L shape or a meandering shape, a metal pin may be connected to the feeding portion 131 shown in FIGS. In this case, the power supply portion is the end of the metal pin on the circuit board 110 side. In this way, the power feed section provided on the metal pin may be arranged near the upper surface of the circuit board 110 and a matching element such as a capacitor or coil may be mounted on the circuit board 110 . In this case, since the metal pin is also a part of the antenna element 130, the length of the monopole antenna element may be set as the length from the feeding portion of the metal pin.

Also, the communication unit 210 and the control unit 220 may be arranged on the circuit board 110 .

In the above description, the connecting portion 160 is connected to the section on the +Y direction side of the edge 154 extending in the Y direction on the -X direction side of the metal plate 150. However, the connecting portion 160 , may be connected to the central portion of the edge 154 in the Y direction.

In the above description, the configuration in which the antenna element 130 is arranged along the edges 121, 151, 122, and 152 of the substrate 120 and the metal plate 150 has been described. For example, the arrangement of the antenna elements 130 is not limited to the arrangement described above.

An antenna device and a wireless communication device according to exemplary embodiments of the present invention have been described above, but the present invention is not limited to the specifically disclosed embodiments, and the scope of the claims Various modifications and changes may be made without departing from the scope of the invention.
Further, the following additional remarks are disclosed with respect to the above embodiment.
(Appendix 1)
a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
and a connecting portion that connects the first metal plate and the second metal plate.
(Appendix 2)
The antenna device according to Supplementary Note 1, wherein the connecting portion is provided at an edge of the second metal plate in a plan view, and connects the edge of the second metal plate and the first metal plate.
(Appendix 3)
3. The antenna device according to appendix 1 or 2, further comprising a substrate provided with the antenna element on one surface and with the first metal plate provided on an inner layer or the other surface.
(Appendix 4)
The connecting portion is provided over a partial section of the edge of the substrate,
3. The antenna device according to claim 3, wherein the antenna element is provided along the edge in a section of the edge other than the section in which the connecting portion is provided.
(Appendix 5)
a circuit board including the first metal plate;
5. The antenna device according to any one of appendices 1 to 4, further comprising: a connector connected to the circuit board and connected to a communication device that communicates in a frequency band different from the communication frequency of the antenna element.
(Appendix 6)
6. The antenna device according to appendix 5, wherein the connecting portion is arranged closer to the antenna element than the connector.
(Appendix 7)
7. The antenna device according to appendix 5 or 6, wherein the communication device is larger than a rectangular area in which the antenna element is arranged in plan view.
(Appendix 8)
8. The antenna device according to any one of appendices 5 to 7, further comprising a feeder connecting between the circuit board and a feeder of the antenna element.
(Appendix 9)
9. The antenna device according to any one of appendices 5 to 8, further comprising a matching element provided on the circuit board or connected to the line of the antenna element.
(Appendix 10)
10. The antenna device according to any one of appendices 5 to 9, wherein the antenna element extends along the first edge of the circuit board.
(Appendix 11)
11. The antenna device according to appendix 10, wherein the connector is provided on a second side opposite to the first side of the circuit board.
(Appendix 12)
11. The antenna device according to any one of appendices 1 to 10, wherein the antenna element is an inverted F type, an inverted L type, or a meander type.
(Appendix 13)
an antenna device;
a communication unit that communicates via the antenna device;
A wireless communication device including a control unit connected to the communication unit and performing communication control,
The antenna device is
a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
A wireless communication device, comprising: a connecting portion that connects the first metal plate and the second metal plate.

REFERENCE SIGNS LIST 100 antenna device 110 circuit board 110A ground layer 120 board 130 antenna element 131 feeding point 140 connection pin 150 metal plate 160 connection section 170 connector 200 wireless communication device 210 communication section 220 control section

Claims (11)

a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
a connecting portion that connects the first metal plate and the second metal plate ;
A substrate provided with the antenna element on one surface and the first metal plate provided on the inner layer or the other surface
including
The connecting portion is provided over a partial section of the edge of the substrate,
The antenna device according to claim 1, wherein the antenna element is provided along the edge in a section of the edge other than the section in which the connecting portion is provided. a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
a connecting portion that connects the first metal plate and the second metal plate ;
a circuit board including the first metal plate;
a connector connected to the circuit board and connected to a communication device that communicates in a frequency band different from the communication frequency of the antenna element;
An antenna device, comprising: 3. The antenna device according to claim 1, wherein said connecting portion is provided at an edge of said second metal plate in plan view, and connects an edge of said second metal plate and said first metal plate. 3. The antenna device according to claim 2 , wherein said connecting portion is arranged closer to said antenna element than said connector. 5. The antenna device according to claim 2 , wherein said communication device is larger than a rectangular area in which said antenna element is arranged in plan view. 6. The antenna device according to any one of claims 2, 4 and 5 , further comprising a feed line connecting between said circuit board and a feed portion of said antenna element. 7. The antenna device according to any one of claims 2, 4 to 6 , further comprising a matching element provided on said circuit board or connected to a line of said antenna element. 8. The antenna device according to any one of claims 2, 4 to 7, wherein said antenna element extends along a first edge of said circuit board. 9. The antenna device according to claim 8 , wherein said connector is provided on a second side opposite to said first side of said circuit board. an antenna device;
a communication unit that communicates via the antenna device;
A wireless communication device including a control unit connected to the communication unit and performing communication control,
The antenna device is
a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
a connecting portion that connects the first metal plate and the second metal plate ;
A substrate provided with the antenna element on one surface and the first metal plate provided on the inner layer or the other surface
has
The connecting portion is provided over a partial section of the edge of the substrate,
The wireless communication device, wherein the antenna element is provided along the edge in a section of the edge other than the section in which the connecting portion is provided. an antenna device;
a communication unit that communicates via the antenna device;
A wireless communication device including a control unit connected to the communication unit and performing communication control,
The antenna device is
a first metal plate held at ground potential;
a monopole antenna element arranged apart from the first metal plate on one surface side of the first metal plate;
a second metal plate arranged at a position overlapping with the first metal plate in plan view on the side opposite to the first metal plate with respect to the antenna element;
a connecting portion that connects the first metal plate and the second metal plate ;
a circuit board including the first metal plate;
a connector connected to the circuit board and connected to a communication device that communicates in a frequency band different from the communication frequency of the antenna element;
A wireless communication device having

Images