JP2020014101A - Card type radio device - Google Patents

Abstract

To provide a card type radio device including a plurality of antennas having different frequency bands.SOLUTION: There are formed on a circuit board 50, a first antenna 210 for receiving radio waves in a first frequency band, a second antenna 220 for receiving radio waves in a second frequency band higher in frequency than the first frequency band, and a third antenna 230 for receiving radio waves in a third frequency band higher in frequency than the second frequency band. The first antenna 210, the second antenna 220, and the third antenna 230 are disposed side by side along an edge (501) of the circuit board 50. The first antenna 210 and the second antenna 220 are disposed at respective corners (511 and 512) of the circuit board 50. The third antenna 230 is disposed between the first antenna 210 and the second antenna 220.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a card-type wireless device having a wireless communication function.

  As a card-type wireless device having a wireless communication function, an IC card having a short-range wireless communication function such as an RFID is generally known. In addition, a card-type device having a beacon communication function of performing position detection and information distribution using BLE (Bluetooth Low Energy), which is a low-power short-range communication technology of Bluetooth (trademark), has been put into practical use. ing.

  However, the conventional card-type wireless device described above has only one communication device, and thus has a disadvantage that its application range is limited. For example, according to a card-type wireless device having a beacon communication function, it is possible to detect an indoor position, but since it does not have a GNSS (global navigation satellite system) receiver, it can be used in a wide area outdoors. Position cannot be detected. Further, in order to communicate with the server only by using the beacon communication function based on BLE, it is necessary to form a mesh network of a plurality of beacon communication devices, and the power consumption of each beacon communication device increases.

  On the other hand, since the card-type wireless device is thin and small as a whole, it is difficult to achieve desired performance when a plurality of communication devices are mounted. In particular, since the characteristics of an antenna are easily affected by the surrounding conductors, when a plurality of antennas are arranged inside a thin and small card-type wireless device, parts inside the device and conductors outside the device (such as a human body) , It is difficult to obtain desired characteristics.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a card-type wireless device including a plurality of antennas having different frequency bands.

  A card-type wireless device according to one embodiment of the present invention includes a circuit board on which a plurality of antennas are formed. The circuit board includes a first antenna that receives a radio wave in the first frequency band, a second antenna that receives a radio wave in a second frequency band higher than the first frequency band, and a second antenna that receives a radio wave in the second frequency band. A third antenna for receiving radio waves of three frequency bands is formed. The first antenna, the second antenna, and the third antenna are arranged side by side along the edge of the circuit board. The first antenna and the second antenna are respectively arranged at corners of the circuit board. The third antenna is disposed between the first antenna and the second antenna.

  Preferably, each of the first antenna and the second antenna may be bent in an L shape along a corner of the circuit board. The third antenna may extend linearly along an edge of the circuit board.

  Preferably, the first antenna is bent in an L-shape along a corner of the circuit board, and at a location adjacent to the third antenna, in a direction away from the edge of the circuit board from a direction along the edge of the circuit board. It may be bent in an L shape. An unmounted area where no circuit components are mounted may be provided between the first antenna and the third antenna.

  Preferably, the first antenna, the second antenna, and the third antenna may be formed only on one surface of the circuit board.

  Preferably, a short-range wireless communication antenna and a non-contact charging coil may be further formed on the circuit board. The circuit board may have a rectangular shape. The first antenna, the second antenna, and the third antenna may be arranged side by side along one short side of the circuit board. The short-range wireless communication antenna and the non-contact charging coil may be arranged side by side along one long side of the circuit board.

  Preferably, the card-type wireless device is a plate-shaped battery disposed in an intermediate region between one short side and the other short side of the circuit board, and storing electric energy supplied through a non-contact charging coil. And a sheet-shaped magnetic member that is disposed between the battery and the circuit board and covers the short-range wireless communication antenna and the non-contact charging coil with respect to the battery.

  Preferably, the middle area of the circuit board on which the battery is arranged may be an unmounted area where no circuit components are mounted.

  Preferably, the first antenna, the second antenna, and the third antenna may be formed only on one surface of the circuit board. The short-range wireless communication antenna and the non-contact charging coil may be formed at least on the other surface of the circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, the card type radio | wireless apparatus provided with the some antenna from which a frequency band differs is provided.

FIG. 1 is a diagram illustrating an example of a configuration of a card-type wireless device according to the present embodiment. FIG. 2A is a perspective view illustrating an example of the external appearance of the card-type wireless device, and FIG. 2B is an enlarged cross-sectional view illustrating an example of the internal structure of the card-type wireless device. FIG. 3 is a diagram illustrating an example of the arrangement of components on the surface of the circuit board. FIG. 4 is a diagram illustrating an example of a conductor pattern formed on the surface of the circuit board. FIG. 5 is a diagram illustrating an example of a conductor pattern formed on the back surface of the circuit board.

  FIG. 1 is a diagram illustrating an example of a configuration of a card-type wireless device 1 according to the present embodiment. FIG. 2A is a perspective view illustrating an example of the external appearance of the card-type wireless device 1, and FIG. 2B is an enlarged cross-sectional view illustrating an example of the internal structure of the card-type wireless device 1. As shown in FIG. 2A, the card-type wireless device 1 according to the present embodiment has a general card shape (rectangular thin plate shape) such as a credit card, and a plurality of communication devices as shown in FIG. Machine.

  The card-type wireless device 1 shown in FIG. 1 includes an acceleration sensor 11, an input unit 12, a display unit 13, a processing unit 14, a storage unit 15, an LPWA communication unit 21, a GNSS reception unit 22, a BLE communication It has a unit 23, a short-range wireless communication unit 24, a charging unit 25, and a battery 30. A first antenna 210 is connected to the LPWA communication unit 21, a second antenna 220 is connected to the GNSS reception unit 22, a third antenna 230 is connected to the BLE communication unit 23, and a short-range wireless communication unit 24 is The short-range wireless communication antenna 240 is connected, and the charging unit 25 is connected to a non-contact charging coil 250.

  The acceleration sensor 11 is a sensor that detects acceleration applied to the card-type wireless device 1, and detects, for example, acceleration in three orthogonal directions.

  The input unit 12 is a device for inputting a user's instruction, and includes, for example, a push button switch.

  The display unit 13 is a device that displays information, and includes, for example, a light emitting element such as an LED.

  The processing unit 14 is a device that comprehensively controls the operation of each unit of the card-type wireless device 1, and includes, for example, a computer that executes processing according to an instruction code of a program stored in the storage unit 15. The processing unit 14 may include dedicated hardware for executing a specific process, in addition to the computer.

  The storage unit 15 stores data temporarily stored in the course of execution of processing in the processing unit 14, constant data repeatedly used in specific processing, a program executed by the computer of the processing unit 14, and the like. The storage unit 15 includes, for example, a semiconductor memory such as a ROM, a RAM, and a flash memory.

  The LPWA communication unit 21 is a device that performs LPWA (low power wide area) type communication, such as LoRa (trademark), and uses a sub-GHz band (for example, 920 MHz) as a frequency band. The transmission distance of the LPWA communication unit 21 is about 1 to 2 km, and long-distance communication is possible as compared with the BLE communication unit 23 described later.

  The GNSS receiving unit 22 receives positioning signals broadcast from a plurality of positioning satellites such as GPS (global positioning system) at the second antenna 220, and acquires information on a geographical position based on the received signals. I do. The GNSS receiver 22 receives radio waves in a frequency band of 1.2 GHz to 1.5 GHz.

  The BLE communication unit 23 performs beacon communication based on the BLE standard with a communication device arranged indoors or the like. The transmission distance of the BLE communication unit 23 is several meters to several tens of meters, and the communicable distance is shorter than that of the LPWA communication unit 21. The frequency band used by the BLE communication unit 23 is 2.4 GHz, and has a higher frequency than the LPWA communication unit 21 and the GNSS receiving unit 22.

  The short-range wireless communication unit 24 is a device that performs wireless communication such as an RFID (radio frequency identifier), and a communicable distance is, for example, about several cm to 1 m. When the short-range wireless communication unit 24 receives the radio wave transmitted from the adjacent reader device by the short-range wireless communication antenna 240, the short-range wireless communication unit 24 starts the processing unit 14 from the sleep state by the DC voltage obtained by rectifying the radio wave. .

  The charging unit 25 charges the battery 30 based on electric power transmitted by electromagnetic induction between the power supply coil of the external wireless charger and the non-contact charging coil 250. A power supply voltage based on the charging voltage of the battery 30 is supplied to each electronic circuit of the card-type wireless device 1.

  The battery 30 stores electric energy supplied from an external wireless charger through the contactless charging coil 250. Battery 30 has a thin plate shape so as to fit inside card-type wireless device 1.

  Here, the operation of the card-type wireless device 1 shown in FIG. 1 will be briefly described.

  The processing unit 14 is basically in a sleep state. For example, when the acceleration sensor 11 detects an acceleration exceeding a threshold, when the input unit 12 performs an input operation, It is activated when electromagnetic induction between the power supply coil of the charger and the non-contact charging coil 250 is detected. The processing unit 14 started from the sleep state returns to the sleep state again after executing predetermined processing.

  When activated in response to the detection signal of the acceleration sensor 11, the processing unit 14 performs beacon communication in the BLE communication unit 23, and outputs position information based on the strength of a reception signal from another BLE communication device installed indoors or the like. get. Further, the processing unit 14 receives a signal from a positioning satellite in the GNSS receiving unit 22 and acquires geographical position information. When acquiring the position information, the processing unit 14 stops the operations of the BLE communication unit 23 and the GNSS reception unit 22, and then activates the LPWA communication unit 21. The processing unit 14 transmits the position information acquired by the BLE communication unit 23 and the GNSS reception unit 22 to the server at a remote location by the LPWA communication unit 21. When the transmission of the location information to the server is completed, the processing unit 14 stops the communication operation of the LPWA communication unit 21 and returns to the sleep state.

  Further, when the processing unit 14 is activated by an input operation (such as pressing a push button switch) on the input unit 12, the processing unit 14 activates the LPWA communication unit 21 and transmits a notification signal of the input operation from the LPWA communication unit 21 to the server. When the transmission of the notification signal to the server is completed, the processing unit 14 stops the operation of the LPWA communication unit 21 and returns to the sleep state.

  Further, when the processing unit 14 is activated by detecting the electromagnetic induction with the wireless charger in the charging unit 25, the processing unit 14 monitors the charging of the battery 30 by the charging unit 25, and returns to the sleep state when the charging is completed.

  Next, the circuit board 50 on which the components of each electronic circuit of the card-type wireless device 1 are mounted will be described. FIG. 3 is a diagram showing an example of the arrangement of components on the surface of the circuit board 50. FIG. 4 is a diagram showing an example of a conductor pattern formed on the surface of the circuit board 50. FIG. 5 is a diagram illustrating an example of a conductor pattern formed on the back surface of the circuit board 50.

  In the examples of FIGS. 2A, 2B, and 3 to 5, three directions (X, Y, Z) orthogonal to each other with respect to the card-type wireless device 1 are defined. The X direction includes the X1 direction and the X2 direction opposite to each other. The Y direction includes directions Y1 and Y2 opposite to each other. The Z direction includes a Z1 direction and a Z2 direction that are opposite to each other. The Z1 side is also called the front side, and the Z2 side is also called the back side. 4 and 5 are views of the circuit board 50 as viewed from the front side, respectively. However, FIG. 5 illustrates the conductor pattern formed on the back surface of the circuit board 50 as seen through from the front side.

  As shown in FIG. 2B, the front surface of the circuit board 50 is covered by the front cover 61, and the back surface is covered by the back cover 62. The front cover 61 is adhered to the front surface of the circuit board 50 by the adhesive layer 41, and the back cover 62 is adhered to the back surface of the circuit board 50 by the adhesive layer 42. As shown in FIG. 2B, a circuit component 70 such as an IC chip is mounted on the front surface of the circuit board 50, and is not mounted on the back surface of the circuit board 50.

  The circuit board 50 is, for example, a multilayer board, and has four layers (51 to 54) in the example of FIG. 2B. The conductor pattern on the front surface shown in FIG. 4 is formed on the first layer 51 of the circuit board 50, and the conductor pattern on the back surface shown in FIG. 5 is formed on the fourth layer 54 of the circuit board 50.

  As shown in FIGS. 3 to 5, the circuit board 50 has a rectangular shape that is substantially the same as the outer shape of the card-type wireless device 1. 3 to 5, “501” and “502” indicate short sides of a rectangular shape, and “503” and “504” indicate long sides of a rectangular shape. “511” indicates an angle at which the short side 501 and the long side 503 intersect, “512” indicates an angle at which the short side 501 and the long side 504 intersect, and “513” indicates an angle at which the short side 502 and the long side 504 intersect. “514” indicates an angle at which the short side 502 and the long side 503 intersect. The short sides 501 and 502 are parallel to the Y direction, and the short side 501 is located on the X1 side of the short side 502. The long sides 503 and 504 are parallel to the X direction, and the long side 503 is located on the Y1 side of the long side 504.

  As shown in FIG. 4, the first antenna 210, the second antenna 220, and the third antenna 230 are each formed as a conductor pattern of the circuit board 50, and extend along the edge (short side 501) of the circuit board 50. Lined up. First antenna 210 is located at corner 511 and second antenna 220 is located at corner 512. The third antenna 230 is disposed between the first antenna 210 and the second antenna 220.

  As shown in FIG. 3, an unmounted area 530 where no circuit components are mounted is provided between an area 211 where the first antenna 210 is formed and an area 231 where the third antenna 230 is formed. An unmounted area 531 on which circuit components are not mounted is also provided between the area 231 where the third antenna 230 is formed and the area 221 where the second antenna 220 is formed.

  As shown in FIG. 4, the first antenna 210 is bent in an L shape along a corner 511 of the circuit board 50, and the edge (short side 501) of the circuit board 50 is located at a position adjacent to the third antenna 230. ) From the direction (Y2 direction) along the direction (X2 direction) away from the edge (short side 501). That is, the first antenna 210 has a conductor portion 210C extending along the long side 503, a conductor portion 210B extending along the short side 501, and a conductor portion 210A extending in a direction away from the short side 501. One end of the conductor portion 210B and one end of the conductor portion 210C intersect in an L shape at a corner 511, and the other end of the conductor portion 210B and one end of the conductor portion 210A intersect in an L shape at an intermediate portion of the short side 501. ing. The transmission output and the reception input of the LPWA communication unit 21 are connected to the other end of the conductor portion 210A.

  As shown in FIG. 4, the second antenna 220 is bent in an L shape along a corner 512 of the circuit board 50. That is, the second antenna 220 has a conductor portion 220A extending along the long side 504 and a conductor portion 220B extending along the short side 501, and has one end of the conductor portion 210B and one end of the conductor portion 210A. Intersect at a corner 512 in an L-shape. The reception input of the GNSS receiver 22 is connected to the other end of the conductor 220A.

  As shown in FIG. 4, the third antenna 230 extends linearly along the edge (short side 501) of the circuit board 50. The transmission output and the reception input of the BLE communication unit 23 are connected to one end (the end on the Y2 side) of the third antenna 230.

  As shown in FIGS. 4 and 5, the first antenna 210, the second antenna 220, and the third antenna 230 are formed only on the front surface of the circuit board 50, and are not formed on the back surface of the circuit board 50.

  As shown in FIGS. 4 and 5, the short-range wireless communication antenna 240 and the non-contact charging coil 250 are arranged along the long side 504 of the circuit board 50. The short-range wireless communication antenna 240 and the non-contact charging coil 250 are spiral conductive patterns, respectively. The short-range wireless communication antenna 240 forms a rectangular spiral as a whole, and the non-contact charging coil 250 It forms a circular spiral. The short-range wireless communication antenna 240 is arranged on the short side 501 side (X1 side) of the non-contact charging coil 250. The short-range wireless communication antenna 240 is formed on the back surface of the circuit board 50, and the non-contact charging coil 250 is formed on both surfaces (back surface and front surface) of the circuit board 50.

  As shown in FIG. 3, the plate-shaped battery 30 has a substantially rectangular shape in plan view. The battery 30 is disposed on the surface of the circuit board 50 in an intermediate region 550 between the short sides 501 and 502. As shown in FIGS. 4 and 5, the intermediate area 550 is also provided with the short-range wireless communication antenna 240 and the non-contact charging coil 250, and these conductor patterns and the battery 30 are in close proximity. . Therefore, a sheet-shaped magnetic member 31 is disposed between the circuit board 50 and the battery 30, as shown in FIG. 2B. The magnetic member 31 covers the short-range wireless communication antenna 240 and the non-contact charging coil 250 with respect to the battery 30. As shown in FIG. 3, the intermediate area 550 where the battery 30 is arranged is an unmounted area where no circuit components are mounted.

  As shown in FIG. 3, the LPWA IC chip 71 including the LPWA communication unit 21 is disposed adjacent to the area 211 where the first antenna 210 is formed on the X2 side. The GNSS IC chip 72 including the GNSS receiver 22 is arranged adjacent to the area 221 where the second antenna 220 is formed on the X2 side. The BLE IC chip 73 including the BLE communication unit 23 is arranged adjacent to the area 231 where the third antenna 230 is formed on the X2 side.

  On the short side 502 side (X2 side) of the area where the non-contact charging coil 250 is disposed on the circuit board 50, a charging IC chip 74 including the charging section 25 is disposed as shown in FIG.

  In the area other than the area where the antennas (the first antenna 210, the second antenna 220, the third antenna 230, the short-range wireless communication antenna 240, and the non-contact charging coil 250) are formed on the surface of the circuit board 50, As shown in FIG. 4, a ground pattern 521 is formed over a wide area. In a region other than the region where the antennas are formed on the back surface of the circuit board 50, a ground pattern 524 is formed in a wide area as shown in FIG.

  According to the card-type wireless device 1 having the above-described configuration, the following effects can be obtained.

(1) Since the first antenna 210, the second antenna 220, and the third antenna 230 are arranged along the edge (short side 501) of the circuit board 50, the edge (short side 501) of the circuit board 50 The effect of the conductive circuit components mounted on the inner side on the transmission and reception of radio waves of each antenna (210, 220, 230) can be reduced.

(2) Since the card-type wireless device 1 is often used by holding the corners with a finger or the like, the first antenna 210 and the second antenna 220 arranged at the corners (511, 512) are (Especially fingers). However, the first antenna 210 and the second antenna 220 have a lower frequency band than the third antenna 230 and have a longer propagation distance of radio waves, and thus are less likely to be affected by a human body than the third antenna 230. Therefore, even when the corner portion is gripped, it is possible to make it difficult to affect communication.

(3) Since the first antenna 210 and the second antenna 220 are each bent in an L shape along the corners (511, 512) of the circuit board 50, it is difficult for these antennas to have directivity in a specific direction. can do. As a result, it is possible to suppress variations in transmission / reception performance according to the orientation, posture, and the like of the card-type wireless device 1.

(4) Since the third antenna 230 extends linearly along the edge (short side 501) of the circuit board 50, a conductive circuit component mounted inside the edge (short side 501) of the circuit board 50 Of the third antenna 230 on transmission and reception of radio waves.

(5) The direction along the edge (short side 501) of the circuit board 50 at a location adjacent to the third antenna 230 while the first antenna 210 is bent in an L shape along the corner 511 of the circuit board 50 Is bent in an L-shape in a direction (X2 direction) away from the edge (short side 501). Thereby, the directivity of the first antenna 210 can be further reduced. Further, since the unmounted area 530 is provided between the first antenna 210 and the third antenna 230, radio waves transmitted and received in the conductor portion 210A of the first antenna 210 are less likely to be affected by circuit components.

(6) Since the first antenna 210, the second antenna 220, and the third antenna 230 are formed only on the front surface of the circuit board 50 and are not formed on the back surface of the circuit board 50, for example, Even if the card-type wireless device 1 is used in a state where the back side is close to the human body, the transmission and reception performance of these antennas can be made hard to be affected by the human body. In addition, since the short-range wireless communication antenna 240 and the non-contact charging coil 230 are formed on the back surface of the circuit board 50, the back side of the card-type wireless device 1 can be used for a short-range wireless communication reader device or non-contact charging. When used for a wireless charger, the short-range wireless communication antenna 240 and the non-contact charging coil 230 are easily brought close to these devices.

(7) The sheet-shaped magnetic member 31 is disposed between the battery 30 and the circuit board 50 disposed in the intermediate region 550 of the circuit board 50, and the short-range wireless communication antenna 240 and the non-contact charging coil 250 are connected to the battery. 30 is covered by a magnetic member 31. As a result, the magnetic field generated in the short-range wireless communication antenna 240 and the non-contact charging coil 250 tends to concentrate on the magnetic member 31, and the magnetic field reaches the metallic member (for example, the metal case) configuring the battery 30. It becomes difficult. Therefore, a decrease in the magnetic field due to the eddy current flowing through the metallic member can be suppressed, and a decrease in the performance of the short-range wireless communication antenna 240 and the contactless charging coil 250 can be suppressed.

(8) Since the middle region 550 of the circuit board 50 on which the battery 30 is arranged is an unmounted region on which no circuit components are mounted, the circuit board 50 is curved near the center of the long sides (503, 504). As a result, detachment or poor contact of the circuit component can be prevented.

(9) Since the plate-shaped battery is arranged in the intermediate region 550 of the circuit board 50, the circuit board 50 can be less likely to be curved near the center of the long sides (503, 504).

  The invention is not limited to the embodiments described above. That is, those skilled in the art may make various changes, combinations, sub-combinations, and alternatives with respect to the components of the above-described embodiments within the technical scope of the present invention or the equivalent scope thereof.

  For example, the communication method of each communication function in the above-described embodiment is an example, and another communication method may be used.

DESCRIPTION OF SYMBOLS 1 ... Card-type radio | wireless device, 11 ... Acceleration sensor, 12 ... Input part, 13 ... Display part, 14 ... Processing part, 15 ... Storage part, 21 ... LPWA communication part, 22 ... GNSS receiving part, 23 ... BLE communication part, 24: short-range wireless communication unit, 210: first antenna, 220: second antenna, 230: third antenna, 240: short-range wireless communication antenna, 250: non-contact charging coil, 25: charging unit, 30 ... Battery, 31 ... magnetic member, 41, 42 ... adhesive layer, 50 ... circuit board, 61 ... front cover, 62 ... back cover, 70 ... circuit parts, 71 ... IC chip for LPWA, 72 ... IC chip for GNSS, 73 ... BLE IC chip, 74: charging IC chip, 501, 502: short side, 503, 504: long side, 511-514 ... corner, 521, 524: ground pattern, 530, 531 ... Mounting region, 550 ... intermediate region

Claims (8)

A card-type wireless device having a circuit board on which a plurality of antennas are formed,
The circuit board includes:
A first antenna for receiving a radio wave of a first frequency band;
A second antenna for receiving a radio wave of a second frequency band having a frequency higher than the first frequency band;
A third antenna for receiving a radio wave of a third frequency band higher in frequency than the second frequency band,
The first antenna, the second antenna, and the third antenna are arranged side by side along an edge of the circuit board,
The first antenna and the second antenna are respectively disposed at corners of the circuit board,
The third antenna is disposed between the first antenna and the second antenna;
Card type wireless device. The first antenna and the second antenna are each bent in an L shape along a corner of the circuit board,
The third antenna extends linearly along an edge of the circuit board;
The card-type wireless device according to claim 1. The first antenna is bent in an L shape along a corner of the circuit board, and is separated from a direction along an edge of the circuit board at a location adjacent to the third antenna. It is bent in an L shape,
An unmounted area where no circuit component is mounted is provided between the first antenna and the third antenna.
The card-type wireless device according to claim 2. The first antenna, the second antenna, and the third antenna are formed only on one surface of the circuit board,
The card-type wireless device according to claim 1. The circuit board includes:
A short-range wireless communication antenna,
A contactless charging coil is further formed,
The circuit board has a rectangular shape,
The first antenna, the second antenna, and the third antenna are arranged side by side along one short side of the circuit board,
The short-range wireless communication antenna and the non-contact charging coil are arranged side by side along one long side of the circuit board,
The card-type wireless device according to claim 1. A plate-shaped battery disposed in an intermediate region between the one short side and the other short side of the circuit board, and storing electric energy supplied through the non-contact charging coil;
A sheet-shaped magnetic member disposed between the battery and the circuit board, and covering the near-field wireless communication antenna and the non-contact charging coil with respect to the battery,
A card-type wireless device according to claim 5. The intermediate area of the circuit board on which the battery is arranged is an unmounted area where no circuit components are mounted.
A card-type wireless device according to claim 6. The first antenna, the second antenna, and the third antenna are formed only on one surface of the circuit board,
The short-range wireless communication antenna and the non-contact charging coil are formed at least on the other surface of the circuit board,
A card-type wireless device according to any one of claims 5 to 7.

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