Antenna device and electronic device

Abstract

A wiring board (11) has a first surface and a second surface. A plate-shaped conductor (14) is provided at a predetermined distance from the first surface of the wiring board (11) and has a rectangular shape. A power feed line (13) is capacitively coupled to a first edge of the periphery of the plate-shaped conductor (14) and supplies power to the plate-shaped conductor (14) by capacitive coupling (C0). A connecting conductor (15) mechanically and electrically connects the plate-shaped conductor (14) to the wiring board (11) at a second edge of the periphery of the plate-shaped conductor (14). A plurality of pin conductors (16) can mechanically connect the wiring board (11) to a wiring board (21) that is provided at a prescribed distance from the second surface of the wiring board (11). The plurality of pin conductors (16) are arranged at predetermined intervals from each other along the position where the connecting conductor (15) and the wiring substrate (11) are connected to each other. The plurality of pin conductors (16) electrically connect the connecting conductor (15) to a ground conductor (22) provided on the wiring board (21).

Description

Antenna Device and Electronic Device

[0001] The present disclosure relates to an antenna device and an electronic device.

[0002] For example, an antenna device of a terminal device in an IoT (Internet of Things) system is required to have as small a size as possible. Such an antenna device is often provided as a communication module integrated with a signal processing circuit such as a non-contact communication circuit. In this case, the communication module is also required to have as small a size as possible.

[0003] For example, Patent Document 1 discloses an interface unit including a shield layer electromagnetically coupled to an antenna, the shield layer functioning as an antenna for transmitting and receiving information.

[0004] International Publication No. 2014 / 097969

[0005] According to Patent Document 1, both the antenna and the shield layer contribute to radiation, and it is necessary to provide an aperture in the shield layer to allow the magnetic flux generated by the antenna to pass through. Therefore, there is a limit to miniaturization of the configuration including the antenna and the shield layer of Patent Document 1. An antenna device that can be easily integrated with a signal processing circuit such as a non-contact communication circuit and is smaller than conventional ones is required.

[0006] An object of the present disclosure is to provide an antenna device that can be easily integrated with a signal processing circuit such as a non-contact communication circuit and is smaller than conventional ones. Another object of the present disclosure is to provide an electronic device including such an antenna device.

[0007] An antenna device according to a first aspect of the present disclosure comprises: a first wiring board having a first surface and a second surface; a first plate-shaped conductor having a rectangular shape and provided at a predetermined distance from the first surface of the first wiring board; a power supply line capacitively coupled to a first edge of the circumference of the first plate-shaped conductor or capacitively coupled to an extension conductor electrically connected to the first edge, and supplying power to the first plate-shaped conductor via capacitive coupling; a connecting conductor at a second edge of the circumference of the first plate-shaped conductor facing the first edge, mechanically and electrically connecting the first plate-shaped conductor to the first wiring board; and a plurality of first pin conductors capable of mechanically connecting the first wiring board to a second wiring board provided at a predetermined distance from the second surface of the first wiring board. The plurality of first pin conductors are arranged at predetermined intervals from each other along the position where the connecting conductor and the first wiring board are connected to each other, and the plurality of first pin conductors are capable of electrically connecting the connecting conductor to a ground conductor provided on the second wiring board.

[0008] According to the antenna device of the second aspect of this disclosure, in the antenna device of the first aspect, the distance between the pair of pin conductors that are furthest apart from each other among the plurality of first pin conductors is set according to the resonant frequency of the antenna device.

[0009] According to an antenna device according to a third aspect of the present disclosure, in an antenna device according to a first aspect, the antenna device further comprises a second wiring board, the plurality of first pin conductors include pin conductors electrically connected to the ground conductor and pin conductors not electrically connected to the ground conductor, and the distance between the pair of pin conductors that are furthest apart from each other among the pin conductors electrically connected to the ground conductor is set according to the resonant frequency of the antenna device.

[0010] According to the fourth aspect of the present disclosure, in the antenna device according to one of the first to third aspects, the connecting conductor is a second plate-shaped conductor integrally formed with the first plate-shaped conductor.

[0011] According to the fifth aspect of the present disclosure, in the antenna device according to one of the first to third aspects, the connecting conductor is a plurality of second pin conductors that extend from the second side of the first plate-shaped conductor toward the first wiring board and are arranged at predetermined intervals from one another.

[0012] According to the sixth aspect of the present disclosure, in the antenna device according to one of the first to fifth aspects, the first plate-shaped conductor has notches provided on the third and fourth sides of the circumference of the first plate-shaped conductor, which are different from the first and second sides.

[0013] According to the seventh aspect of the present disclosure, in the antenna device according to one of the first to sixth aspects, the feed line comprises: a radiating electrode electrically connected to the extension conductor; a feed electrode capacitively coupled to the radiating electrode and transmitting a radio frequency signal; and a grounding electrode capacitively coupled to the radiating electrode and electrically connectable to the grounding conductor.

[0014] According to the antenna device of the eighth aspect of the present disclosure, in the antenna device of the seventh aspect, the first wiring board is a multilayer board including a plurality of conductor layers, the feeding electrode and the ground electrode are connected to different conductor layers among the plurality of conductor layers, and the radiating electrode is arranged between the feeding electrode and the ground electrode.

[0015] According to the antenna device of the ninth aspect of this disclosure, in the antenna device of the seventh or eighth aspect, the extension conductor is a third plate-shaped conductor integrally formed with the first plate-shaped conductor.

[0016] According to the antenna device of the tenth aspect of the present disclosure, in the antenna device of the seventh or eighth aspect, the extension conductor is a plurality of third pin conductors that extend from the first side of the first plate-shaped conductor over a predetermined length and are arranged at predetermined intervals from one another.

[0017] An electronic device according to an eleventh aspect of the present disclosure comprises an antenna device according to one of the first to tenth aspects, and a signal processing circuit provided on the first wiring board for processing radio frequency signals transmitted or received via the antenna device.

[0018] According to an electronic device according to a twelfth aspect of the present disclosure, in an electronic device according to an eleventh aspect, the antenna device further comprises a plurality of fourth pin conductors which are mechanically connectable to the second wiring board and which are electrically connected to the signal processing circuit, and the first wiring board has a notch or slit provided between the position where the first pin conductor is connected and the position where the fourth pin conductor is connected.

[0019] According to one aspect of this disclosure, it is possible to easily integrate it with signal processing circuits such as uncoupled communication circuits, and to provide an antenna device that is smaller than conventional ones.

[0020] This is a perspective view showing the configuration of the electronic device 10 according to the first embodiment. This is a first side view showing the configuration of the electronic device 10 in Figure 1. This is a second side view showing the configuration of the electronic device 10 in Figure 1. This is a graph showing the frequency characteristics of the electronic device 10 in Figure 1, where the pin conductor 16 has a first arrangement. This is a graph showing the frequency characteristics of the electronic device 10 in Figure 1, where the pin conductor 16 has a second arrangement. This is a side view showing the configuration of the electronic device 10 according to a modified example of the first embodiment. This is a perspective view showing the configuration of the electronic device 10A according to the second embodiment. This is a perspective view showing the configuration of the electronic device 10B according to the third embodiment. This is a side view showing the configuration of the electronic device 10C according to the fourth embodiment. This is a perspective view showing the configuration of the electronic device 10D according to the fifth embodiment. This is a side view showing the configuration of the electronic device 10D in Figure 10. This is a diagram showing the detailed configuration of the power supply line 42 in Figure 10. This is a side view showing the configuration of the electronic device 10E according to the sixth embodiment. This is a side view showing the configuration of the electronic device 10F according to the seventh embodiment.

[0021] Hereinafter, antenna devices and electronic devices according to each embodiment of the present invention will be described with reference to the drawings. Throughout the drawings, the same reference numerals indicate the same components.

[0022] [First Embodiment] [Configuration of the First Embodiment] Figure 1 is a perspective view showing the configuration of the electronic device 10 according to the first embodiment. Figure 2 is a first side view showing the configuration of the electronic device 10 in Figure 1.

[0023] The electronic device 10 is mechanically and electrically connected to a wiring board 21 equipped with a grounding conductor 22. The grounding conductor 22 has a predetermined area sufficient for the antenna device to operate. In other examples shown in Figure 1, only the electronic device 10 is connected to the wiring board 21, but generally, the wiring board 21 may be provided with many other circuits and circuit elements.

[0024] The electronic device 10 comprises a wiring board 11, a signal processing circuit 12, a power supply line 13, a plate-shaped conductor 14, a connecting conductor 15, and a plurality of pin conductors 16, 17.

[0025] The wiring board 11 has a first surface and a second surface. In this specification, the upper surface of the wiring board 11 in Figure 1 is also referred to as the "first surface," and the lower surface of the wiring board 11 in Figure 1 is also referred to as the "second surface."

[0026] The signal processing circuit 12 is provided on the upper or lower surface of the wiring board 11 and processes radio frequency signals transmitted or received via the electronic device 10. The signal processing circuit 12 may process radio frequency signals transmitted and received according to, for example, the Bluetooth® communication method.

[0027] The power supply line 13 is capacitively coupled to one side of the periphery of the plate-shaped conductor 14 and supplies power to the plate-shaped conductor 14 via the capacitive coupling C0. The power supply line 13 may be composed of multiple parts 13a to 13c, for example, as shown in Figure 2. The power supply line 13a is formed as a pattern conductor on the wiring board 11, for example. The power supply line 13c is provided along one side of the periphery of the plate-shaped conductor 14 and at a predetermined distance from the plate-shaped conductor 14. The power supply line 13b mechanically connects the power supply line 13c to the wiring board 11 and electrically connects the power supply line 13c to the power supply line 13a. The portions where the power supply line 13c and the plate-shaped conductor 14 face each other may be straight, for example, as shown in Figure 1, or they may have other shapes, such as a meander shape.

[0028] The plate-shaped conductor 14 is provided at a predetermined distance from the upper surface of the wiring board 11. The plate-shaped conductor 14 has a rectangular shape. In this specification, "rectangular shape" means having a roughly rectangular outline and may have notches, protrusions, or other partial deformations as shown in Figure 8.

[0029] The connecting conductor 15 mechanically and electrically connects the plate-shaped conductor 14 to the wiring board 11 at the side of the plate-shaped conductor 14 that is opposite to the side to which the power supply line 13 is connected. The connecting conductor 15 may be integrally formed with the plate-shaped conductor 14. In this case, the plate-shaped conductor 14 and the connecting conductor 15 are obtained by bending a single plate-shaped conductor.

[0030] Multiple pin conductors 16 and 17 mechanically connect the wiring board 11 to a wiring board 21 which is provided at a predetermined distance from the lower surface of the wiring board 11.

[0031] The multiple pin conductors 16 are arranged at predetermined intervals from each other along the location where the connecting conductor 15 and the wiring board 11 are connected to each other. The multiple pin conductors 16 are arranged near the location where the connecting conductor 15 and the wiring board 11 are connected to each other, substantially extending the connecting conductor 15 in the Z direction. The multiple pin conductors 16 electrically connect the connecting conductor 15 to the ground conductor 22 provided on the wiring board 21. The multiple pin conductors 16 may be connected to the connecting conductor 15 via a pattern conductor 11a formed on the wiring board 11, for example, as shown in Figure 2.

[0032] One end of each of the multiple pin conductors 17 is electrically connected to the signal processing circuit 12, and the other end of each of the multiple pin conductors 17 is electrically connected to the ground conductor 22 or another circuit (not shown).

[0033] The plate-shaped conductor 14, the connecting conductor 15, and the pin conductor 16 contribute to radiation. As a result, the electronic device 10 operates as a kind of λ / 4 plate-shaped inverted-F antenna, powered via a capacitive coupling C0 at one end of the radiating element and grounded at the other end of the radiating element.

[0034] The plate-shaped conductor 14, the connecting conductor 15, and the pin conductor 16 contribute to the radiation of the antenna device and may also function as shielding conductors for the signal processing circuit 12.

[0035] The space between the wiring board 11 and the plate-shaped conductor 14 may be filled with resin. The space between the wiring boards 11 and 21 may also be filled with resin. In the latter case, the multiple pin conductors 16 and 17 may be provided as via conductors that penetrate the resin.

[0036] In this specification, the components of the electronic device 10, excluding the signal processing circuit 12, are also referred to as the "antenna device."

[0037] [Operation of the First Embodiment] The antenna device according to this embodiment can adjust its frequency characteristics by changing the arrangement of the multiple pin conductors 16.

[0038] Figure 3 is a second side view showing the configuration of the electronic device 10 in Figure 1. When the electronic device 10 has nine pin conductors 16, the pair of pin conductors 16 that are furthest apart from each other have a distance d1. In this case, the high-frequency current caused by the excitation of the antenna device flows through the pair of pin conductors 16 that are furthest apart from each other, i.e., along the thick dashed line. On the other hand, when the electronic device 10 has five pin conductors 16, the pair of pin conductors 16 that are furthest apart from each other have a distance d2. In this case, the high-frequency current flows through the pair of pin conductors 16 that are furthest apart from each other, i.e., along the thick solid line. In the latter case, the path length of the current is longer than in the former case, and therefore the resonant frequency of the antenna device is lower. Thus, the distance between the pair of pin conductors 16 that are furthest apart from each other among the multiple pin conductors 16 is set according to the resonant frequency of the antenna device.

[0039] Next, the simulation results of the antenna device according to this embodiment will be described with reference to Figures 4 and 5.

[0040] Figure 4 is a graph showing the frequency characteristics of the electronic device 10 in Figure 1, where the pin conductors 16 have a first arrangement. In Figure 4, the electronic device 10 has nine pin conductors 16, and the high-frequency current flows along the thick dashed line in Figure 3. In this case, the antenna device has a resonant frequency of approximately 2.7 GHz.

[0041] Figure 5 is a graph showing the frequency characteristics of the electronic device 10 in Figure 1, specifically when the pin conductors 16 have a second arrangement. In Figure 5, the electronic device 10 has seven pin conductors 16, with both ends removed from the nine pin conductors 16. In this case, the antenna device has a resonant frequency of approximately 2.4 GHz. Comparing Figures 4 and 5, it can be seen that the frequency characteristics of the antenna device change by changing the arrangement of the multiple pin conductors 16.

[0042] The smaller the distance between the pair of pin conductors 16 that are furthest apart from each other, the lower the resonant frequency of the antenna device.

[0043] [Effect of the First Embodiment] Conventional antenna devices may include a power feeding element and a non-powered element provided separately from the signal processing circuit in an unshielded area. In this case, a certain amount of space is required to provide the antenna device and the signal processing circuit. On the other hand, according to the present embodiment, since the shield conductor is used as the radiation element of the planar inverted-F antenna, a small antenna device can be provided that can be easily integrated with the signal processing circuit 12 without requiring extra components such as other power feeding elements and non-powered elements.

[0044] For example, when operating in the 2.4 GHz band, an antenna device having a size of several millimeters in each of the vertical, horizontal, and height directions can be provided.

[0045] According to the present embodiment, the impedance of the antenna device can be adjusted by capacitively coupling the power feeding line 13 to the planar conductor 14 through the capacitive coupling C0.

[0046] According to the present embodiment, the frequency characteristics of the antenna device can be changed by changing the arrangement of the plurality of pin conductors 16. Therefore, the frequency characteristics of the antenna device can be changed without changing the overall dimensions of the antenna device.

[0047] As described above, according to the present embodiment, an antenna device that can be easily integrated with the signal processing circuit 12 and is smaller than the conventional one can be provided. Further, according to the present embodiment, an electronic device 10, which is a communication module smaller than the conventional one and includes an antenna device and a signal processing circuit 12 integrated with each other, can be provided.

[0048] [Modification of the First Embodiment] FIG. 6 is a side view showing the configuration of an electronic device 10 according to a modification of the first embodiment. The plurality of pin conductors 16 of the electronic device 10 may include a pin conductor 16 electrically connected to the ground conductor 22a and a pin conductor 16 not electrically connected to the ground conductor 22a. For this reason, instead of the ground conductor 22 (see FIG. 3) formed so as to be connected to all the pin conductors 16, the wiring board 21 is provided with a ground conductor 22a formed so as not to be connected to a part of the pin conductors 16. The distance d2 between a pair of pin conductors 16 that are the most remote from each other among the pin conductors 16 electrically connected to the ground conductor 22a is set according to the resonance frequency of the antenna device. By changing the electrical connection between the plurality of pin conductors 16 and the ground conductor, equivalently, the arrangement of the plurality of pin conductors 16 can be changed as described with reference to FIGS. 3 to 5, and the frequency characteristics of the antenna device can be changed.

[0049] [Second Embodiment] FIG. 7 is a perspective view showing the configuration of an electronic device 10A according to the second embodiment. The electronic device 10A includes a plurality of pin conductors 31 that extend from one side of the plate-like conductor 14 toward the wiring board 11 and are arranged at a predetermined interval from each other, instead of the connection conductor 15 in FIG. 1. According to the second embodiment, as in the first embodiment, it is possible to provide an antenna device that is smaller than conventional ones, and it is possible to provide an electronic device 10 that is a communication module smaller than conventional ones. Further, according to the second embodiment, by changing the arrangement of the plurality of pin conductors 31, the frequency characteristics of the antenna device can be easily adjusted.

[0050] [Third Embodiment] Figure 8 is a perspective view showing the configuration of an electronic device 10B according to the third embodiment. The electronic device 10B includes a plate-shaped conductor 14B instead of the plate-shaped conductor 14 in Figure 1. The plate-shaped conductor 14B has notches 32 provided on the two remaining sides of the periphery of the plate-shaped conductor 14B, which are different from the side connected to the feed line 13 and the side connected to the connecting conductor 15. High-frequency current flows along the notches 32, that is, along the thick solid lines. In this case, the path length of the current is longer than the path length of the current without notches 32 (which travels in a straight line along the edge of the plate-shaped conductor 14 in Figure 1), and therefore the resonant frequency of the antenna device is lower. The depth of the notches 32 is set according to the resonant frequency of the antenna device. The deeper the notches 32, the lower the resonant frequency of the antenna device.

[0051] The closer the notch 32 gets to the ground conductor 22, that is, the closer the notch 32 gets to the connecting conductor 15, the easier it becomes to adjust the resonant frequency of the antenna device according to the depth of the notch 32.

[0052] Instead of providing a notch in the plate-shaped conductor 14B, a notch may be provided in the connecting conductor 15. In this case as well, the resonant frequency of the antenna device can be adjusted according to the depth of the notch.

[0053] As explained with reference to Figure 7, when the antenna device has multiple pin conductors 31 instead of a connecting conductor 15, the same effect as when a notch is provided in the connecting conductor 15 can be obtained by removing a predetermined number of pin conductors 31 from both ends. In this case, there is no need to provide a notch in the plate-shaped conductor or connecting conductor, so the processing of the plate-shaped conductor or connecting conductor is simplified.

[0054] [Fourth Embodiment] Figure 9 is a side view showing the configuration of an electronic device 10C according to the fourth embodiment. The electronic device 10C includes a wiring board 11C instead of the wiring board 11 in Figure 1. The wiring board 11C includes portions 11Ca and 11Cb of the wiring board separated by a slit 33. The wiring board 11Ca is connected to a connecting conductor 15 and a plurality of pin conductors 16. The wiring board 11Cb is connected to a signal processing circuit 12 and a plurality of pin conductors 17.

[0055] As shown in Figure 2, when pin conductors 16 and 17 are connected to a single wiring board 11, high-frequency current that should flow from the plate conductor 14 and connecting conductor 15 through the pin conductor 16 to the ground conductor 22 may partially flow to the signal processing circuit 12 and to other circuits through the pin conductor 17. Such extra current paths can affect the frequency characteristics of the antenna device. On the other hand, as shown in Figure 9, by providing a slit 33 in the wiring board 11C, the extra current paths can be eliminated, and the range over which the resonant frequency of the antenna device can be adjusted can be widened.

[0056] The wiring board may have notches instead of slits 33 between the positions where pin conductors 16 and 17 are connected. By providing notches on the wiring board, high-frequency currents are less likely to flow into the signal processing circuit 12 and other circuits, thereby widening the range over which the resonant frequency of the antenna device can be adjusted.

[0057] [Fifth Embodiment] Figure 10 is a perspective view showing the configuration of the electronic device 10D according to the fifth embodiment. Figure 11 is a side view showing the configuration of the electronic device 10D in Figure 10. The electronic device 10D includes a power supply line with a configuration different from that of the electronic devices according to the first to fourth embodiments.

[0058] The electronic device 10D includes a plate-shaped conductor 41 and a power supply line 42 instead of the power supply line 13 shown in Figure 1.

[0059] The plate-shaped conductor 41 is an extension conductor electrically connected to one side of the periphery of the plate-shaped conductor 14. The plate-shaped conductor 41 may be integrally formed with the plate-shaped conductor 14. In this case, the plate-shaped conductor 14 and the plate-shaped conductor 41 are obtained by bending a single plate-shaped conductor.

[0060] The power supply line 42 is capacitively coupled to the plate-shaped conductor 41 and supplies power to the plate-shaped conductor 41 and the plate-shaped conductor 14 via capacitive coupling. The power supply line 42 may be composed of a plurality of parts 42a to 42c, namely a power supply electrode 42a, a ground electrode 42b, and a radiating electrode 42c, as shown in Figure 11, for example. The radiating electrode 42c is electrically connected to the plate-shaped conductor 41. The power supply electrode 42a is capacitively coupled to the radiating electrode 42c and connected to the signal processing circuit 12 to transmit radio frequency signals. The ground electrode 42b is capacitively coupled to the radiating electrode 42c and can be electrically connected to the ground conductor 22 via the pin conductor 17.

[0061] Figure 12 shows the detailed configuration of the power supply line 42 in Figure 10. The wiring board 11 may be a multilayer board including multiple conductor layers. In the example in Figure 12, the wiring board 11 is a double-sided board including pattern conductors 11b and 11c. The power supply electrode 42a and the ground electrode 42b are connected to different conductor layers among the multiple conductor layers, for example, the pattern conductors 11b and 11c, respectively. The radiating electrode 42c is positioned between the power supply electrode 42a and the ground electrode 42b. This forms a capacitive coupling C1 between the power supply electrode 42a and the radiating electrode 42c, and a capacitive coupling C2 between the ground electrode 42b and the radiating electrode 42c. By adjusting the magnitude of the capacitive couplings C1 and C2, the frequency characteristics of the antenna device can be adjusted.

[0062] Although not shown in Figures 11 and 12, the power supply electrode 42a, the ground electrode 42b, and the radiating electrode 42c are mechanically supported by some component. The power supply electrode 42a, the ground electrode 42b, and the radiating electrode 42c may be configured as conductive layers of a multilayer substrate.

[0063] According to the fifth embodiment, similar to the first embodiment, it is possible to provide an antenna device that is smaller than conventional devices, and to provide an electronic device 10D which is a communication module that is smaller than conventional devices.

[0064] According to the fifth embodiment, it is possible to provide an antenna device and electronic device 10D that have adjustable frequency characteristics and are smaller than conventional devices.

[0065] [Sixth Embodiment] Figure 13 is a side view showing the configuration of the electronic device 10E according to the sixth embodiment. The electronic device 10E includes a plurality of pin conductors 31, similar to the case in Figure 7, instead of the connecting conductor 15 in Figure 10. According to the sixth embodiment, similar to the case in the second embodiment, the frequency characteristics of the antenna device can be easily adjusted by changing the arrangement of the plurality of pin conductors 31.

[0066] [Seventh Embodiment] Figure 14 is a side view showing the configuration of the electronic device 10F according to the seventh embodiment. The electronic device 10F includes a plurality of pin conductors 43 that extend from one side of the periphery of the plate-shaped conductor 14 over a predetermined length and are arranged at predetermined intervals from one another, instead of the plate-shaped conductor 41 in Figure 11. The pin conductors 43 are extension conductors electrically connected to one side of the periphery of the plate-shaped conductor 14. According to the seventh embodiment, the frequency characteristics of the antenna device can be easily adjusted by changing the arrangement of the plurality of pin conductors 43.

[0067] [Other Embodiments] The wiring board 21 and the grounding conductor 22 may be provided as part of the electronic device 10 or other components.

[0068] As mentioned above, the signal processing circuit 12 may be provided on either side of the wiring board 11. Alternatively, the signal processing circuit 12 may be provided on the wiring board 21 instead of the wiring board 11. In this case, the power supply line 13 extends to the signal processing circuit on the wiring board 21 via the pin conductor 17.

[0069] The position where the power supply line is capacitively coupled to the plate-shaped conductor may be located closer to the wiring board 11 than in the other cases shown in Figure 1. In this case, an additional connecting conductor may be provided on one side of the plate-shaped conductor, electrically connected to the plate-shaped conductor and extending toward the wiring board 11, and the power supply line may be capacitively coupled to the lower end of the additional connecting conductor.

[0070] An antenna device and an electronic device according to one aspect of this disclosure can be applied, for example, to the communication modules of each terminal device in an IoT system.

[0071] 10, 10A-10F Electronic devices 11, 11C, 11Ca, 11Cb Wiring boards 11a-11c Pattern conductors 12 Signal processing circuits 13, 13a-13c Power supply lines 14, 14B Plate conductors 15 Connecting conductors 16, 17 Pin conductors 21 Wiring boards 22, 22a Ground conductors 31 Pin conductors 32 Notches 33 Slits 41 Plate conductors 42 Power supply lines 42a Power supply electrodes 42b Ground electrodes 42c Radiating electrodes 43 Pin conductors C0-C2 Capacitive coupling

Claims

1. A wiring board comprising: a first wiring board having a first surface and a second surface; a first plate-shaped conductor having a rectangular shape and provided at a predetermined distance from the first surface of the first wiring board; a power supply line capacitively coupled to a first edge of the circumference of the first plate-shaped conductor or capacitively coupled to an extension conductor electrically connected to the first edge, and supplying power to the first plate-shaped conductor via capacitive coupling; a connecting conductor at a second edge of the circumference of the first plate-shaped conductor facing the first edge, mechanically and electrically connecting the first plate-shaped conductor to the first wiring board; and a plurality of first pin conductors capable of mechanically connecting the first wiring board to a second wiring board provided at a predetermined distance from the second surface of the first wiring board, wherein the plurality of first pin conductors are arranged at predetermined intervals from each other along the position where the connecting conductor and the first wiring board are connected to each other, and the plurality of first pin conductors are capable of electrically connecting the connecting conductor to a ground conductor provided on the second wiring board. Antenna device.

2. The distance between the pair of pin conductors that are furthest apart from each other among the plurality of first pin conductors is set according to the resonant frequency of the antenna device, as described in claim 1.

3. The antenna device according to claim 1, further comprising the second wiring board, wherein the plurality of first pin conductors include pin conductors electrically connected to the ground conductor and pin conductors not electrically connected to the ground conductor, and the distance between the pair of pin conductors furthest from each other among the pin conductors electrically connected to the ground conductor is set according to the resonant frequency of the antenna device.

4. The antenna device according to one of claims 1 to 3, wherein the connecting conductor is a second plate-shaped conductor integrally formed with the first plate-shaped conductor.

5. The antenna device according to one of claims 1 to 3, wherein the connecting conductor is a plurality of second pin conductors that extend from the second side of the first plate-shaped conductor toward the first wiring board and are arranged at predetermined intervals from one another.

6. The antenna device according to one of claims 1 to 5, wherein the first plate-shaped conductor has notches provided on third and fourth sides of the circumference of the first plate-shaped conductor that are different from the first and second sides.

7. The antenna device according to one of claims 1 to 6, wherein the power supply line comprises a radiating electrode electrically connected to the extension conductor, a power supply electrode capacitively coupled to the radiating electrode and transmitting a radio frequency signal, and a grounding electrode capacitively coupled to the radiating electrode and electrically connectable to the grounding conductor.

8. The antenna device according to claim 7, wherein the first wiring board is a multilayer board including a plurality of conductor layers, the power supply electrode and the ground electrode are connected to different conductor layers among the plurality of conductor layers, and the radiating electrode is positioned between the power supply electrode and the ground electrode.

9. The antenna device according to claim 7 or 8, wherein the extension conductor is a third plate-shaped conductor integrally formed with the first plate-shaped conductor.

10. The antenna device according to claim 7 or 8, wherein the extension conductor is a plurality of third pin conductors that extend from the first side of the first plate-shaped conductor over a predetermined length and are arranged at predetermined intervals from one another.

11. An electronic device comprising an antenna device according to one of claims 1 to 10, and a signal processing circuit provided on the first wiring board for processing radio frequency signals transmitted or received via the antenna device.

12. The antenna device further comprises a plurality of fourth pin conductors, each of which is electrically connected to the signal processing circuit, and the first wiring board has notches or slits provided between the positions to which the first pin conductors are connected and the positions to which the fourth pin conductors are connected, according to claim 11.

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