JP2012178960A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna improved in power transmission efficiency with a high Q (quality factor).SOLUTION: An antenna comprises: a base material 310 having a first surface 311, and a second surface 312 which is a back surface of the first surface 311; a first surface conductive portion 330 which is formed on the first surface 311 on the base material 310, and has two end portions of a first surface first end portion 331 and a first surface second end portion 332; a second surface conductive portion 350 which is formed on the second surface 312 on the base material 310, has two end portions of a second surface first end portion 351 and a second surface second end portion 352, and superimposes on the first surface conductive portion 330 when transparently viewed from the first surface 311 to the second surface 312; a first through-hole conductive portion 341 which penetrates between the first surface 311 and the second surface 312, and electrically connects the first surface first end portion 331 and the second surface first end portion 351; and a second through-hole conductive portion 342 which penetrates between the first surface 311 and the second surface 312, and electrically connects the first surface second end portion 332 and the second surface second end portion 352.

Description

  The present invention relates to an antenna that is used in a magnetic resonance wireless power transmission system and receives power or transmits power.

  In recent years, development of technology for transmitting electric power (electric energy) wirelessly without using a power cord or the like has become active. Among wireless transmission methods, there is a technique called magnetic resonance as a technology that has attracted particular attention. This magnetic resonance method was proposed by a research group of Massachusetts Institute of Technology in 2007, and a technology related to this is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-501510.

  A magnetic resonance wireless power transmission system efficiently transmits energy from a power transmission side antenna to a power reception side antenna by making the resonance frequency of the power transmission side antenna and the resonance frequency of the power reception side antenna the same. One of the major features is that the power transmission distance can be several tens of centimeters to several meters.

Some proposals have been made on the specific configuration of the antenna used in the above-described magnetic resonance type wireless power transmission system. For example, Patent Document 2 (Japanese Patent Application Laid-Open No. 2010-73976) discloses a structure of a communication coil provided in each of the power feeding circuit and the power receiving circuit of a wireless power transmission apparatus that wirelessly transmits power from the power feeding circuit to the power receiving circuit. A printed circuit board made of a material having a relative dielectric constant greater than 1, a primary coil provided on the first layer of the printed circuit board and formed of a conductive pattern forming at least one loop, and a second layer of the printed circuit board And a resonance coil formed of a conductive pattern having a spiral shape. The communication coil structure of the wireless power transmission device is disclosed.
Special table 2009-501510 JP 2010-73976 A

  However, the power transmission antenna used in the conventional power transmission system has a problem that the value of Q (Quality Factor), which is an important parameter for power transmission, is not necessarily high and the power transmission efficiency is lowered. there were.

In order to solve the above-mentioned problem, the invention according to claim 1 is formed on the first surface on the base material having a first surface and a second surface that is the back surface of the first surface. A first surface conductive portion having two ends, a first surface first end and a first surface second end, and a second surface formed on the second surface on the substrate; A second surface conductive layer having two end portions, a first surface end portion and a second surface second end portion, which overlaps with the first surface conductive portion when viewed transparently from the first surface to the second surface. A first through-hole conducting portion that penetrates between the first surface and the second surface and conducts between the first surface first end and the second surface first end, A second through-hole conducting portion that penetrates between the first surface and the second surface and conducts the first surface second end portion and the second surface second end portion; It is an antenna.

Moreover, the invention which concerns on Claim 2 is provided with two or more so that the electroconductive part which has a 1st edge part and a 2nd edge part may be laminated | stacked through a base material, The said 1st edge parts in the said electroconductive part are Are electrically connected to each other by a through-hole conductive part that penetrates the base material, and the second ends of the conductive part are electrically connected to each other by a through-hole conductive part that penetrates the base material, and are viewed transparently from the stacking direction. A plurality of the conductive parts are configured to overlap each other.

  The antenna according to the present invention has a configuration in which a first surface conductive portion and a second surface conductive portion formed so as to overlap with the first surface conductive portion are conductively connected to each other by through holes at both ends. With the antenna according to the above, the Q (Quality Factor) is improved by lowering the resistance value without significantly reducing the inductance, so that the transmission efficiency between the antennas is improved.

1 is a block diagram of a power transmission system in which an antenna according to an embodiment of the present invention is used. It is a figure which shows the inverter part of an electric power transmission system. 1 is an exploded perspective view of a power receiving antenna 201 according to a first embodiment of the present invention. It is a schematic diagram of the cross section which shows the mode of the electric power transmission by the power receiving antenna 201 which concerns on 1st Embodiment of this invention. It is a figure which shows the change of the transmission efficiency accompanying the position shift of an antenna. It is a disassembled perspective view of the receiving antenna 201 which concerns on 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a power transmission system in which an antenna according to an embodiment of the present invention is used. The antenna according to the present invention can be applied to both a power receiving antenna and a power transmitting antenna constituting the power transmission system. However, in the following embodiments, the antenna of the present invention is used as the power receiving antenna. The applied example will be described.

  As a power transmission system using the antenna of the present invention, for example, a system for charging a vehicle such as an electric vehicle (EV) or a hybrid electric vehicle (HEV) is assumed. Since the electric power transmission system transmits electric power to the vehicle as described above in a non-contact manner, the electric power transmission system is provided in a stop space where the vehicle can be stopped. The stop space, which is a vehicle charging space, is configured such that the power transmission antenna 105 and the like are buried in the ground. A user of the vehicle stops the vehicle in a stop space where the power transmission system is provided, and makes the power reception antenna 201 mounted on the vehicle and the power transmission antenna 105 face each other to thereby generate power from the power transmission system. Receive power. When the vehicle is stopped in the stop space, the power receiving antenna 201 mounted on the vehicle has a positional relationship with good transmission efficiency with respect to the power transmission antenna 105.

  In the power transmission system, when power is efficiently transmitted from the power transmission antenna 105 on the power transmission system 100 side to the power reception antenna 201 on the power reception side system 200 side, the resonance frequency of the power transmission antenna 105 and the resonance frequency of the power reception antenna 201 are By making the same, energy transmission is efficiently performed from the power transmission side antenna to the power reception side antenna.

  The AC / DC conversion unit 101 in the power transmission side system 100 is a converter that converts input commercial power into a constant direct current. The output from the AC / DC converter 101 is boosted to a predetermined voltage in the high voltage generator 102. The setting of the voltage generated by the high voltage generator 102 can be controlled from the main controller 110.

The inverter unit 103 generates a predetermined AC voltage from the high voltage supplied from the high voltage generation unit 102 and inputs it to the matching unit 104. FIG. 2 is a diagram illustrating an inverter unit of the power transmission system. For example, as shown in FIG. 2, the inverter unit 103 includes four field effect transistors (FETs) composed of Q _{A to} Q _D connected in a full bridge system.

In the present embodiment, between the connection portion T1 between the switching elements Q _A and Q _B connected in series and the connection portion T2 between the switching elements Q _C and Q _D connected in series. The matching device 104 is connected to the switching element Q _A.
When the switching element Q _D is on, the switching element Q _B and the switching element Q _C are off. When the switching element Q _B and the switching element Q _C are on, the switching element Q _A and the switching element Q _D are off. As a result, a rectangular wave AC voltage is generated between the connection portion T1 and the connection portion T2. In the present embodiment, the range of the frequency of the rectangular wave generated by switching of each switching element is about several hundred kHz to several thousand kHz.

Drive signals for the switching elements Q _{A to} Q _D constituting the inverter unit 103 as described above are input from the main control unit 110. The frequency for driving the inverter unit 103 can be controlled from the main control unit 110.

  The matching unit 104 is composed of a passive element having a predetermined circuit constant, and receives an output from the inverter unit 103. The output from the matching unit 104 is supplied to the power transmission antenna 105. The circuit constants of the passive elements constituting the matching unit 104 can be adjusted based on a command from the main control unit 110. The main control unit 110 instructs the matching unit 104 so that the power transmitting antenna 105 and the power receiving antenna 201 resonate.

  The power transmission antenna 105 is composed of a coil having an inductance component, and resonates with the vehicle-mounted power reception antenna 201 arranged so as to face each other, whereby electric energy output from the power transmission antenna 105 is supplied to the power reception antenna 201. You can send.

  The main control unit 110 of the power transmission system 100 is a general-purpose information processing unit that includes a CPU, a ROM that holds a program that runs on the CPU, and a RAM that is a work area of the CPU. The main control unit 110 operates in cooperation with the components connected to the main control unit 110 shown in the figure.

  The communication unit 120 is configured to perform wireless communication with the vehicle-side communication unit 220 so that data can be transmitted to and received from the vehicle. Data received by the communication unit 120 is transferred to the main control unit 110, and the main control unit 110 can transmit predetermined information to the vehicle side via the communication unit 120.

  Next, a configuration provided on the vehicle side will be described. In the system on the power receiving side of the vehicle, the power receiving antenna 201 receives electric energy output from the power transmitting antenna 105 by resonating with the power transmitting antenna 105. Such a power receiving antenna 201 is adapted to be attached to the bottom portion of the vehicle.

The AC power received by the power receiving antenna 201 is rectified by the rectification unit 202, and the rectified power is stored in the battery 204 through the charge control unit 203.
The charging control unit 203 controls the storage of the battery 205 based on a command from the main control unit 210. In addition, the charging control unit 203 is configured to perform the remaining amount management of the battery 204 and the like.

  The main control unit 210 is a general-purpose information processing unit that includes a CPU, a ROM that holds programs that run on the CPU, and a RAM that is a work area of the CPU. The main controller 210 operates in cooperation with the components connected to the main controller 210 shown in the figure.

  The interface unit 230 is provided in the driver's seat of the vehicle and provides predetermined information to the user (driver) or accepts operation / input from the user. A touch panel, a speaker, and the like. When a predetermined operation by the user is executed, it is sent as operation data from the interface unit 230 to the main control unit 210 and processed. Further, when providing predetermined information to the user, display instruction data for displaying the predetermined information is transmitted from the main control unit 210 to the interface unit 230.

  Further, the vehicle-side communication unit 220 is configured to perform wireless communication with the power transmission-side communication unit 120 and to transmit and receive data to and from the power transmission-side system. Data received by the communication unit 220 is transferred to the main control unit 210, and the main control unit 210 can transmit predetermined information to the power transmission system side via the communication unit 220.

  In the power transmission system, a user who wants to receive power inputs the information indicating that charging is performed from the interface unit 230 by stopping the vehicle in the stop space where the power transmission side system as described above is provided. Receiving this, the main control unit 210 obtains the remaining amount of the battery 205 from the charge control unit 203 and calculates the amount of power necessary for charging the battery 205. The calculated amount of power and information to request power transmission are transmitted from the vehicle side communication unit 220 to the communication unit 120 of the power transmission side system. The main control unit 110 of the power transmission side system that has received the information controls the high voltage generation unit 102, the inverter unit 103, and the matching unit 104 to transmit power to the vehicle side.

  Next, a specific configuration of the antenna used in the power transmission system 100 configured as described above will be described. Hereinafter, although the example which employ | adopted the structure of this invention for the power receiving antenna 201 is demonstrated, the antenna of this invention is applicable also to the power transmission antenna 105. FIG.

  FIG. 3A is an exploded perspective view of the power receiving antenna 201 according to the first embodiment of the present invention, and FIG. 3B exaggeratedly represents the thickness direction of the base material 310 forming the coil body 300. FIG. FIG. 4 is a schematic cross-sectional view showing a state of power transmission by the power receiving antenna 201 according to the first embodiment of the present invention. In the following embodiments, a rectangular flat plate is described as an example of the coil body 270, but the antenna of the present invention is not limited to such a coil having such a shape. For example, a circular flat plate or the like can be used as the coil body 270.

  Such a coil body 270 functions as a magnetic resonance antenna unit in the power receiving antenna 201. This “magnetic resonance antenna section” includes not only the inductance component of the coil body 270 but also a capacitance component based on its floating capacity, or a capacitance component based on an intentionally added capacitor.

  The resin case 260 is used to accommodate the coil body 270 having the inductance component of the power receiving antenna 201. The resin case 260 has a box shape having an opening made of a resin such as polycarbonate.

  Side plate portions 262 are provided from each side of the rectangular bottom plate portion 261 of the resin case 260 so as to extend in a direction perpendicular to the bottom plate portion 261. An upper opening 263 is formed above the resin case 260 so as to be surrounded by the side plate 262. In order to attach the resin case 260 to the vehicle body, any conventionally known method can be used. A flange member or the like may be provided around the upper opening 263 in order to improve attachment to the vehicle main body.

  The coil body 300 includes a rectangular flat plate-like substrate 310 made of glass epoxy and conductive portions formed on the front side and the back side. More specifically, the base material 310 has a first surface 311 as a main surface and a second surface 312 in a front-back relationship with the first surface 311, and the first surface 311 and the second surface. By forming a spiral conductive portion on both sides 312, an inductance component is imparted to the power receiving antenna 201.

  A spiral first surface conductive portion 330 is formed on the first surface 311 on the substrate 310, and the first surface first end portion 331 is provided on the inner peripheral side of the first surface conductive portion 330. A first surface second end 332 is provided on each outer peripheral side.

  Similarly, a spiral second surface conductive portion 350 is formed on the second surface 312 on the substrate 310, and a second surface first end 351 is formed on the inner peripheral side of the second surface conductive portion 350. The second surface second end 352 is provided on the outer peripheral side.

  Here, the first surface conductive portion 330 and the second surface conductive portion 350 are configured to overlap each other when viewed transparently from the first surface 311 to the second surface 312. With this configuration, the mutual inductance between the inductance component based on the first surface conductive portion 330 on the first surface 311 side and the inductance component based on the second surface conductive portion 350 on the second surface 312 side is adjusted and designed. Easy to do.

  In the base material 310, the first through-hole conducting portion 341 penetrating between the first surface 311 and the second surface 312 connects the first surface first end portion 331 and the second surface first end portion 351. It is designed to conduct. In addition, the second through-hole conduction part 342 penetrating between the first surface 311 and the second surface 312 conducts the first surface second end 332 and the second surface second end 352. Yes.

  A conductive line (not shown) is electrically connected to the first surface first end portion 331 on the inner peripheral side and the first surface second end portion 332 on the outer peripheral side of the first surface conductive portion 330 having a spiral shape as described above. Is done. As a result, the power received by the power receiving antenna 201 can be guided to the rectifying unit 202. Such a coil body 300 is placed on the rectangular bottom plate portion 261 of the resin case 260 and fixed on the bottom plate portion 261 by an appropriate fixing means.

  The antenna according to the present invention as described above is based on the first surface conductive portion 330 of the first surface 311, the antenna based on the second surface conductive portion 350 of the second surface 312, and the first as the inductance component. Based on the mutual inductance formed mutually by the surface conductive portion 330 and the second surface conductive portion 350 formed so as to overlap therewith, without significantly reducing the inductance, Since the first surface conductive portion 330 and the second surface conductive portion 350 are connected in parallel, the resistance of the electric circuit in the antenna is reduced. According to the above, since Q (Quality Factor) can be improved, transmission efficiency between antennas is improved.

The magnetic shield 280 is a flat magnetic member having a hollow portion 285. In order to construct the magnetic shield 280, a magnetic material such as ferrite can be used. The magnetic shield 280 is arranged with a certain amount of space above the coil body 300 by being fixed to the resin case 260 by an appropriate means. With such a layout, the lines of magnetic force generated on the power transmission antenna 105 side have a high rate of transmission through the magnetic shield 280, and the lines of magnetic force generated by metal objects constituting the vehicle main body in power transmission from the power transmission antenna 105 to the power reception antenna 201. The impact on is minor.

  In the antenna according to the present invention, the flat magnetic shield 280 disposed above the coil body 270 is preferably provided with a hollow portion 285. By providing the hollow portion 285 in the magnetic shield 280, the loss of the magnetic shield 280 itself is reduced, and the shielding effect of the magnetic shield 280 can be maximized. Further, in the magnetic shield 280 having the hollow portion 285, the member area is small, and the cost of the antenna can be reduced. Note that the width of the hollow portion 285 is preferably limited to such a size that the magnetic shield 280 itself and the conductive portion 272 of the coil body 270 do not overlap each other when viewed from the stacking direction.

  FIG. 5 is a diagram showing a change in transmission efficiency due to the positional deviation of the antenna. In FIG. 5, in the “present invention”, the antenna according to the present invention is used for either the power transmitting antenna 105 or the power receiving antenna 201, whereas in the “comparative example”, the power transmitting antenna 105 and the power receiving antenna 201 are An antenna having a conductive portion provided on only the first surface (only one surface) is used.

  FIG. 5A shows a change in efficiency when the power transmitting antenna 105 and the power receiving antenna 201 are shifted from a predetermined facing position in the long side direction in the horizontal plane including the power receiving antenna 201 (or the power transmitting antenna 105). FIG. 5B shows the efficiency when the power transmitting antenna 105 and the power receiving antenna 201 are shifted from the predetermined facing position in the short side direction in the horizontal plane including the power receiving antenna 201 (or the power transmitting antenna 105). It is a figure which shows the change of. The long and short sides are determined based on the length of the sides of the rectangular base material 310 as shown in FIG. Further, FIG. 5 is based on the measurement result by VNA (Vector Network Analyzer).

  As shown in FIGS. 5A and 5B, in any positional relationship, power transmission is performed using the antenna according to the comparative example when power transmission is performed using the antenna according to the present invention. It can be seen that the transmission efficiency is improved as compared with the case of the above.

  Table 1 shows a characteristic table of characteristics of the antenna according to the present invention and the antenna according to the comparative example. In the table, the upper side shows the characteristics of the antenna alone, and the lower side shows the characteristics during power transmission.

また、表中のαと効率ηとの間には、下式（１）の関係がある。

Further, there is a relationship of the following expression (1) between α and efficiency η in the table.

ここでαは、送電アンテナ、受電アンテナのＱ値を各々Ｑ１、Ｑ２とすると、α＝ｋ²
＊Ｑ１＊Ｑ２であり送電アンテナ、受電アンテナがほぼ同一特性を有する時、即ち、Ｑ１≒Ｑ２＝Ｑと見なせる場合、α＝（ｋＱ）²と定義される。

Where α is α = k ² , where the Q values of the transmitting antenna and the receiving antenna are Q1 and Q2, respectively.
When Q1 * Q2 and the power transmitting antenna and the power receiving antenna have substantially the same characteristics, that is, when Q1≈Q2 = Q, it is defined as α = (kQ) ² .

  In the antenna according to the present invention, it can be seen that the single antenna characteristic Q can be improved by reducing R. Further, in the antenna according to the present invention, the entire antenna is improved by improving the inductance (mutual inductance) in which the inductance by the first surface conductive portion 330 and the inductance by the second surface conductive portion 350 provided on the front and back of the substrate 310 are combined. Is reduced to 2uH (about 1.5% of the total inductance). From the above, it can be seen that the antenna according to the present invention has superiority in antenna performance (efficiency).

  As described above, the antenna according to the present invention has a configuration in which the first surface conductive portion 330 and the second surface conductive portion 350 formed so as to overlap with the first surface conductive portion 330 are electrically connected to each other by through holes. According to the antenna according to the present invention, since the resistance value is lowered and Q (Quality Factor) is improved without significantly reducing the inductance, the transmission efficiency between the antennas is improved.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the conductive portion in the coil body 300 is configured to be provided on the front and back of the base material 310. However, in the second embodiment, the conductive portion of the coil body 300 is provided in the intermediate layer of the base material 310. Is different in that it is also provided. Hereinafter, the configuration of the coil body 300 which is the difference will be described.

  FIG. 3A is an exploded perspective view of the power receiving antenna 201 according to the second embodiment of the present invention, and FIG. 3B exaggeratedly represents the thickness direction of the base material 310 forming the coil body 300. FIG.

    The coil body 300 is composed of a rectangular flat plate-like base material 310 made of glass epoxy, and conductive portions formed on the front surface side, the back surface side, and the intermediate layer. More specifically, the base material 310 has a first surface 311 as a main surface, a second surface 312 having a front-back relationship with the first surface 311, and an intermediate between the first surface 311 and the second surface 312. A spiral conductive portion is formed in the first surface 311, the second surface 312, and the intermediate layer 313, so that an inductance component is imparted to the power receiving antenna 201.

  A spiral first surface conductive portion 330 is formed on the first surface 311 on the substrate 310, and the first surface first end portion 331 is provided on the inner peripheral side of the first surface conductive portion 330. A first surface second end 332 is provided on each outer peripheral side.

  Similarly, a spiral intermediate layer conductive portion 360 is formed on the intermediate layer 313 on the substrate 310, and the intermediate layer first end 361 is provided on the inner peripheral side of the intermediate layer conductive portion 360, and the outer periphery An intermediate layer second end 362 is provided on each side.

  Similarly, a spiral second surface conductive portion 350 is formed on the second surface 312 on the substrate 310, and a second surface first end 351 is formed on the inner peripheral side of the second surface conductive portion 350. The second surface second end 352 is provided on the outer peripheral side.

  Here, the first surface conductive portion 330, the intermediate layer conductive portion 360, and the second surface conductive portion 350 are configured to overlap each other when viewed transparently from the first surface 311 to the second surface 312. With this configuration, the inductance component based on the first surface conductive portion 330 on the first surface 311 side, the inductance component based on the intermediate layer conductive portion 360 of the intermediate layer 313, and the second surface on the second surface 312 side. It becomes easy to adjust and design the mutual inductance with the inductance component based on the conductive portion 350.

  In the substrate 310, the first through-hole conducting portion 341 that penetrates between the first surface 311 and the intermediate layer 313 conducts the first surface first end portion 331 and the intermediate layer first end portion 361. It is like that. A second through-hole conduction portion 342 that penetrates between the first surface 311 and the intermediate layer 313 connects the first surface second end portion 332 and the intermediate layer second end portion 362.

  Further, a third through-hole conducting portion 343 penetrating between the intermediate layer 313 and the second surface 312 conducts the intermediate layer first end portion 361 and the second surface first end portion 351. . The fourth through-hole conducting portion 344 that passes between the intermediate layer 313 and the second surface 312 conducts the intermediate layer second end 362 and the second surface second end 352. .

  Also in the second embodiment having the coil body 300 configured as described above, it is possible to enjoy the same effects as in the previous embodiment. In the second embodiment, the conductive portion is formed in three layers of the first surface 311, the intermediate layer 313, and the second surface 312, and the end portions of the respective conductive portions penetrate through the base material. However, it is also possible to provide two or more intermediate layers and four or more layers for providing the conductive portion.

  In this embodiment, an example in which a glass epoxy resin is used for the substrate 310 has been described. However, a ceramic substrate having a higher heat dissipation effect may be used, and an insulating film is applied to a metal substrate such as aluminum. You may use the base material which did. Of course, a thing using a flexible printed circuit board etc. may be used.

  As described above, the antenna according to the present invention has a configuration in which the first surface conductive portion and the second surface conductive portion formed so as to overlap with the first surface conductive portion are conductively connected to each other through the through holes. According to the antenna of the present invention, the resistance value is lowered and the Q (Quality Factor) is improved without significantly reducing the inductance, so that the transmission efficiency between the antennas is improved.

DESCRIPTION OF SYMBOLS 100 ... Electric power transmission system 101 ... AC / DC conversion part 102 ... High voltage generation part 103 ... Inverter part 104 ... Matching device 105 ... Power transmission antenna 110 ... Main control part 120 ... Communication unit 201 ... Receiving antenna 202 ... Rectification unit 203 ... Charge control unit 204 ... Battery 210 ... Main control unit 220 ... Communication unit 230 ... Interface unit 260- ··· Resin case 261 ··· Bottom plate portion 262 ··· Side plate portion 263 ··· Upper opening portion 280 ··· Magnetic shield 281 ··· Shield holding plate 282 ··· Magnetic shield divided piece 285 ··· Part 300 ... Coil body 310 ... Base material 311 ... First face 312 ... Second face 313 ... Intermediate layer 330 ... First face conductive part 331 ... First face first One end 332 .. First surface second end portion 341... First through hole conducting portion 342... Second through hole conducting portion 343... Third through hole conducting portion 344. 2nd surface conductive part 351 2nd surface 1st end 352 2nd surface 2nd end 360 ... Intermediate layer conductive part 361 2nd layer 1st end 362 ..Intermediate layer second end

Claims (2)

A base material having a first surface and a second surface which is the back surface of the first surface;
A first surface conductive portion formed on the first surface of the substrate and having two ends, a first surface first end and a first surface second end;
It is formed on the second surface on the base material, and has two end portions, a second surface first end portion and a second surface second end portion, and is transmitted from the first surface to the second surface. When it sees, the 2nd surface conductive part which overlaps with the 1st surface conductive part,
A first through-hole conducting portion that penetrates between the first surface and the second surface and conducts the first surface first end and the second surface first end;
A second through-hole conducting portion that penetrates between the first surface and the second surface and conducts the first surface second end portion and the second surface second end portion; And antenna. A plurality of conductive portions having a first end portion and a second end portion are provided so as to be laminated via a base material,
The first ends of the conductive part are electrically connected to each other by a through-hole conductive part that penetrates the base material,
The second ends of the conductive part are electrically connected to each other by a through-hole conductive part that penetrates the base material,
An antenna, wherein the plurality of conductive portions are configured to overlap each other when viewed transparently from the stacking direction.

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