JP5417497B2 - Card device and electronic device provided with coupler - Google Patents

Description

  Embodiments of the present invention generally relate to a coupler for transmitting and receiving electromagnetic waves, for example, a coupler and an electronic device used for proximity wireless communication.

  In recent years, development of proximity wireless communication technology has been advanced. Proximity wireless communication technology allows communication between two devices in close proximity to each other. Each device having a proximity wireless communication function includes a coupler. When two devices are in close proximity, the couplers of the two devices are electromagnetically coupled to each other. This combination allows the devices to send and receive signals to and from each other wirelessly.

  A typical coupler includes, for example, a coupling element, an electrode pole, a resonant stub, and a ground. The signal is supplied to the coupling element via the resonant stub and the electrode pole. As a result, a current flows through the coupling element, and an electromagnetic field is generated around the coupler. This electromagnetic field allows electromagnetic coupling between the couplers of two devices in close proximity to each other. Another example of a typical coupler is an inverted-F antenna.

JP 2010-157872 A

  By the way, the coupler is required to have sufficient resistance against the positional deviation between the coupler and the counterpart coupler. This is to prevent the wireless communication between devices from being affected even if the positional relationship between adjacent devices is slightly deviated.

  Furthermore, the coupler built in the device is also required to have a high impedance. This is because when the coupler is mounted in the device, coupling between the coupler and peripheral components in the device occurs, and the input impedance of the coupler is lowered. The decrease in input impedance is a factor that degrades the electromagnetic field radiation efficiency of the coupler.

  Furthermore, recently, in order to make it easy to mount the coupler on various devices, a reduction in the height of the coupler is also required.

  An object of the present invention is to provide a coupler and an electronic device that can realize both the reduction of the influence of peripheral components and sufficient resistance against displacement.

  According to the embodiment, a card device that can be inserted into a card slot of an electronic device, the coupler being in the card device and used for proximity wireless communication, and electromagnetic waves by electromagnetic coupling with other couplers The coupler includes a linear coupling element having a first open end and a second open end, a ground plane, a feed element that connects the coupling element and a feed point, and the feed A first short-circuit element that connects the element and the ground plane; and a second short-circuit element that connects the feed element and the ground plane. The feed element has a first end connected to an intermediate portion between the first open end and the second open end of the coupling element, and a second end connected to the feed point. The first short-circuit element has a third end disposed between the first end and the second end of the feeding element, and a fourth end connected to the ground plane. The second short-circuit element has a fifth end disposed between the first end and the second end of the feeding element, and a sixth end connected to the ground plane.

The figure which shows the structural example of the coupler which concerns on embodiment. The figure for demonstrating the direction of the electric current which flows into the coupler which concerns on the same embodiment. The perspective view which shows the example of the mounting structure of the coupler which concerns on the same embodiment. The perspective view which shows the example of another mounting structure of the coupler which concerns on the same embodiment. The figure which shows the other structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure for demonstrating the parameter used in the characteristic measurement of the coupler which concerns on the same embodiment. The figure for demonstrating the parameter used in the characteristic measurement of the coupler which concerns on the same embodiment. The figure which shows the characteristic of the coupler which concerns on the same embodiment. The perspective view which shows the external appearance of the electronic device carrying the coupler concerning the embodiment. FIG. 15 is a diagram for explaining the arrangement of couplers in the electronic device of FIG. 14. The figure which shows a mode that the card | curd containing the coupler which concerns on the embodiment is mounted | worn with the card slot of the electronic device of FIG. FIG. 15 is a block diagram showing a system configuration of the electronic device of FIG. 14. The figure for demonstrating the structural example of the card | curd containing the coupler which concerns on the same embodiment. The figure for demonstrating the other structural example of the card | curd containing the coupler which concerns on the same embodiment. The figure for demonstrating the further another structural example of the card | curd containing the coupler which concerns on the embodiment. The figure for demonstrating the further another structural example of the card | curd containing the coupler which concerns on the embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment. The figure which shows the further another structural example of the coupler which concerns on the same embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
First, the configuration of the coupler 1 according to the embodiment will be described with reference to FIG. The coupler 1 transmits and receives electromagnetic waves by electromagnetic coupling with other couplers. The coupler 1 is used in close proximity wireless communication. Proximity wireless communication performs data transfer between devices that are close to each other. For example, TransferJet (registered trademark) can be used as the close proximity wireless communication system. TransferJet is a proximity wireless communication method using UWB (Ultra Wide Band). When two devices approach within range (eg, 3 cm), their respective couplers are electromagnetically coupled so that they can send and receive signals to and from each other wirelessly.

  As shown in FIG. 1, the coupler 1 includes a coupling element 11, a ground plane 12, a feeding element 13, a feeding point 14, and a short-circuit element 15. The ground plane 12 has a flat plate shape. The coupling element 11, the feeding element 13, and the short-circuit element 15 are all linear.

  The coupling element 11 is an elongated element and has a first open end E1 and a second open end E2. The first open end E1 is one end of the coupling element 11, and nothing is connected here. The second open end E2 is the other end of the coupling element 11, and nothing is connected here. The coupling element 11 is used for electromagnetic coupling between the coupler 1 and another coupler.

  The feeding element 13 connects between the feeding point 14 and the coupling element 11. One end of the feeding element 13 is connected to an intermediate portion A1 between the first open end E1 and the second open end E2 of the coupling element 11. On the other hand, the other end of the feeding element 13 is connected to the feeding point 14. The middle portion A1 of the coupling element 11 is located at or near the middle point of the coupling element 11 in the longitudinal direction.

  FIG. 2 shows the current flowing through the coupler 1. Each arrow in FIG. 2 indicates the direction of current. In the present embodiment, since the feeding point 14 is coupled to the intermediate portion A1 of the coupling element 11 via the feeding element 13 as described above, in the coupling element 11, currents in opposite directions, that is, from the intermediate portion A1. The electric current which goes to the 1st open end E1 and the electric current which goes to the 2nd open end E2 from intermediate part A1 flow. Moreover, the intensity of these currents (current amount) is the same. Therefore, in the coupling element 11, the current distribution is substantially symmetric with respect to the intermediate portion A1.

  The degree of coupling strength between the couplers tends to be stronger when the directions of the currents flowing through the two opposing couplers are the same as compared with each other. In the present embodiment, currents having the same amount of current and opposite directions can be supplied to the coupling element 11, so that it is possible to increase resistance to misalignment.

  As shown in FIG. 1, the short-circuit element 15 connects the coupling element 11 and the ground plane 12 (short-circuit) in order to increase the impedance (input impedance) of the coupler 1. In the present embodiment, the short-circuit element 15 does not directly connect the coupling element 11 to the ground plane 12 but connects between the feeding element 13 and the ground plane 12. More specifically, one end of the short-circuit element 15 is disposed (connected) between one end and the other end of the power feeding element 13, and the other end of the short-circuit element 15 is connected to the ground plane 12.

  If the coupling element 11 and the ground plane 12 are directly connected, the high impedance of the coupler 1 can be realized, but the current distribution in the coupling element 11 is asymmetric with respect to the intermediate portion A1. Now, it is assumed that the intermediate position between the intermediate portion A1 of the coupling element 11 and the first open end E1 and the ground plane 12 are connected by a short-circuit element. In this case, the intensity of the current from the intermediate position between the intermediate portion A1 and the first open end E1 toward the first open end E1 is second from the intermediate position between the intermediate portion A1 and the first open end E1. It becomes weaker than the intensity of the current toward the open end E2. If the end E1 and the ground plane 12 are connected by a short-circuit element, only the current directed to the end E2 flows in the coupling element 11, and as a result, the resistance to displacement is reduced.

  In the present embodiment, since the short-circuit element 15 connects between the power feeding element 13 and the ground plane 12, it is possible to prevent the currents flowing in opposite directions from each other with the same current amount through the coupling element 11, that is, the position of the coupler 1. The high impedance of the coupler 1 can be achieved without weakening the shift tolerance.

  The electrical length from the feeding point 14 to each of the first open end E1 and the second open end E2 is ¼ of the wavelength λ corresponding to the center frequency of the electromagnetic wave (high frequency signal) transmitted and received by the coupler 1. The electrical length corresponds to the length of the current path from the feeding point 14 to the open end. When ½ of the longitudinal length of the coupling element 11 is L1, and the length of the feed element 13 is L2, L1 + L2 is λ / 4. Thereby, a part of the coupling element 11 (a part from the intermediate part A1 to the first open end E1) and the feeding element 13 function as one resonance antenna part, and another part of the coupling element 11 (from the intermediate part A1). The portion up to the second open end E2) and the feeding element 13 function as another resonance antenna unit, so that a radio signal having a desired frequency can be transmitted and received without providing a resonance stub.

  FIG. 3 shows a structural example of the coupler 1. The coupler structure shown in FIG. 3 corresponds to a planar coupler. The coupler 1 includes a substrate (dielectric substrate) 20. On the first surface of the substrate 20, the coupling element 11, the ground plane 12, the feeding element 13, the feeding point 14, and the short-circuit element 15 are arranged. The coupling element 11, the feeding element 13, the feeding point 14, and the short-circuit element 15 can be realized by a metal wiring pattern. The ground plane 12 can be realized by a plate-like ground layer. A communication module that is electrically connected to the coupler 1 may be further provided on the substrate 20. This communication module performs close proximity wireless communication with other devices via the coupler 1.

  As shown in FIG. 4, one of the coupling element 11 or the ground plane 12 is disposed on the first surface of the substrate 20, and the other of the coupling element 11 or the ground plane 12 is disposed on the second surface (back surface) of the substrate 20. May be. In FIG. 4, the coupling element 11, the power feeding element 13, and the short-circuit element 15 are disposed in the first region on the first surface of the substrate 20. On the other hand, the ground plane 12 is disposed in the third region on the second surface (back surface) of the substrate 20. The third region is a region that does not face the first region on the first surface.

  In the planar coupler structure of FIG. 4, the coupling element 11, the feeding element 13, and the short-circuit element 15 do not face the ground plane 12. Therefore, even if a thin substrate is used as the substrate 20, it is possible to prevent the energy loss of the coupler 1 from increasing. The reason is as follows.

  The characteristics of the coupler are affected by the distance between the coupling element and the ground plane. If the distance between the coupling element and the ground plane is too short, a part of the electromagnetic field generated from the coupling element tends to flow into the ground plane due to the coupling between the coupling element and the ground plane. As a result, energy loss occurs and electromagnetic coupling between the couplers is weakened. If the distance between the coupling element and the ground plane is set long, coupling between the coupling element and the ground plane can be avoided. However, in order to increase the distance between the coupling element and the ground plane, a thick substrate must be used, which increases the height of the coupler. In the present embodiment, since the coupling element 1 does not face the ground plane 12, a sufficient distance between the coupling element 1 and the ground plane 12 can be easily secured. Therefore, even if a thin substrate is used as the substrate 20, it is possible to prevent the energy loss of the coupler 1 from increasing.

  The feeding point 14 may be disposed on the second front surface (back surface) of the substrate 20. In this case, the power feeding element 13 may be connected to the power feeding point 14 through the through hole 13A in the substrate 20. Further, the short-circuit element 15 may be connected to the ground plane 12 through a through hole 15 </ b> A in the substrate 20.

  Note that only a part of each of the feeding element 13 and the short-circuiting element 15 is disposed on the first surface of the substrate 20, and the remaining part thereof is disposed on the second surface of the substrate 20, with a through hole therebetween. May be connected.

  In the structure of FIG. 4, a communication module may be further provided on the substrate 20.

  Next, with reference to FIGS. 5 to 10, some other configuration examples of the coupler 1 of the present embodiment will be described.

  The coupler 1 shown in FIG. 5 is different from the configuration of FIG. 1 in that two short-circuit elements 15A and 15B are provided, and the other points are the same as the configuration of FIG. The two short-circuit elements 15A and 15B are provided on both sides of the power feeding element 13. The short-circuit element 15 </ b> A connects between the power feeding element 13 and the ground plane 12. More specifically, one end of the short-circuit element 15A is disposed (connected) between one end and the other end of the power feeding element 13, and the other end of the short-circuit element 15A is connected to the ground plane 12. Similarly, the short-circuit element 15 </ b> B connects between the power feeding element 13 and the ground plane 12. More specifically, one end of the short-circuit element 15B is disposed (connected) between one end and the other end of the power feeding element 13, and the other end of the short-circuit element 15B is connected to the ground plane 12.

  In the coupler 1 shown in FIG. 5, since the short-circuit elements 15 </ b> A and 15 </ b> B are provided on both sides of the power feeding element 13, the symmetry of the current distribution can be improved as compared with the configuration of FIG.

  In the coupler 1 shown in FIG. 6, the feeding point 14 is provided at an offset position, not directly below the central portion A1. Thus, even if the position of the feeding point 14 is offset, the same effect as the configuration of FIG. 1 can be obtained.

  The configuration example in FIG. 7 is also an example in which the position of the feeding point 14 is offset. In this coupler 1, the positional relationship between the feeding element 13 and the short-circuit element 15 is opposite to the configuration of FIG. 1.

  In the coupler 1 shown in FIG. 8, both ends of the coupling element 11 are bent downward. With this configuration, even if the width of the substrate 20 is narrow, the length of the coupling element 11 can be set to an appropriate length.

  In the coupler 1 shown in FIG. 9, both end portions of the coupling element 11 are bent downward, and further, both ends of the upper end of the ground plate 12 are cut off, and tapers 12A and 12B are formed on both sides of the upper end of the ground plate 12. Is provided. With this configuration, a sufficient distance between the coupling element 11 and the ground plane 12 can be ensured.

  FIG. 10 shows an example in which the configuration in which both sides of the upper end of the base plate 12 are cut out is applied to the coupler 1 in FIG. In addition, the structure which cuts off the both sides of the upper end of the baseplate 12 is applicable also to the structure of FIG.5, FIG.6, FIG.7, respectively.

  Next, with reference to FIG. 11, FIG. 12, and FIG. 13, the result of the characteristic measurement of the coupler 1 will be described. 11 and 12 show the measurement conditions. FIG. 13 shows the characteristic (curve 21) of the coupler 1 under the measurement conditions of FIG. 11 and the characteristic (curve 22) of the coupler 1 under the measurement conditions of FIG. The horizontal axis in FIG. 13 represents the frequency, and the vertical axis in FIG. 13 represents the transmission coefficient (S21 [dB]).

  The measurement conditions are as follows.

  In FIG. 11, the coupling element of the reference coupler 10 is shifted 10 mm to the right with respect to the coupling element of the coupler 1, and the vertical offset distance between the couplers is 10 mm. As the reference coupler 10, an ordinary coupler widely known in this field may be used. In the example of FIG. 11, the reference coupler 10 includes a substrate 10A, a coupling element 10B, and a ground plane 10C.

  In FIG. 12, the coupling element of the reference coupler 10 is shifted 10 mm to the left with respect to the coupling element of the coupler 1, and the vertical offset distance between the couplers is 10 mm.

  It will be understood from FIG. 13 that sufficient coupler characteristics can be obtained even when the position of the reference coupler 10 is shifted in the left or right direction with respect to the coupler 1.

  FIG. 14 is a perspective view showing an external appearance of an electronic device on which the coupler 1 is mounted. This electronic device is realized as an information processing apparatus, for example, a notebook-type portable personal computer 30 that can be driven by a battery.

  The computer 30 includes a main body 300 and a display unit 350. The display unit 350 is rotatably attached to the main body 300. The display unit 350 rotates between an open position that exposes the upper surface of the main body 300 and a closed position that covers the upper surface of the main body 300. An LCD (liquid crystal display) 351 is provided in the housing of the display unit 350.

  The main body 300 has a thin box-shaped housing. The housing of the main body 300 includes a lower case 300a and a top cover 300b fitted thereto. On the upper surface of the main body 300, a keyboard 301, a touch pad 302, a power switch 303, and the like are arranged. A card slot 304 is provided on the outer wall of the housing of the main body 300, for example, the right side wall. In the example of FIG. 14, a card slot 304 is arranged at the upper part of the storage part of the optical disk drive 305. A coupler 1 is provided in the housing of the main body 300. As shown in FIG. 15, for example, the coupler 1 is disposed so that the coupling element 11 on the substrate 20 faces the top cover 300 b and faces the outer wall of the housing of the main body 300. That is, in the substrate 20 of the coupler 1, the first area on the substrate 20 where the first surface of the substrate 20 faces the top cover 300b and the coupling element 11 is arranged is more than the second area where the ground plane 12 is arranged. Also, the main body 300 is disposed in the casing in a direction close to the outer wall (for example, the right side wall) of the casing. Thus, a part of the right side wall and a part of the palm rest area 300c of the top cover 300b each function as a communication surface.

  The coupler 1 may be provided in the housing of the display unit 350.

  Further, as shown in FIG. 16, the coupler 1 may be provided in a card device (for example, an SD card) 306 that is removably inserted into the card slot 304. In this case, a connector 306A for interfacing with the host is provided at one end of the card device 306. The coupler 1 is arranged in the card device 306 so that the coupling element 11 is located on the other end side of the card device 306. As described above, since the coupler 1 has a high impedance, even when the coupler 1 is realized as the card device 306, it is possible to reduce the influence of coupling with peripheral components in the main body 300.

FIG. 17 is a block diagram illustrating a system configuration of the computer 30.
In addition to the coupler apparatus 1, the keyboard 301, the touch pad 302, the power switch 303, the optical disk drive (ODD) 305 and the LCD 351, the computer 30 includes a hard disk drive (HDD) 404, CPU 405, main memory 406, BIOS (basic input / output). system) -ROM 407, north bridge 408, graphics controller 409, video memory (VRAM) 410, south bridge 411, embedded controller / keyboard controller IC (EC / KBC) 412, power supply controller 413, and proximity wireless communication device 414.

  The hard disk drive 404 stores an operating system (OS), various application programs, and the like. The CPU 405 is a processor for controlling the operation of the computer 30 and executes various programs loaded from the hard disk drive 404 to the main memory 406. Programs executed by the CPU 405 include an operating system 501, a proximity wireless communication gadget application program 502, an authentication application program 503, or a transmission tray application program 504. The CPU 405 executes a BIOS program stored in the BIOS-ROM 407 for hardware control.

  The north bridge 408 connects the local bus of the CPU 405 and the south bridge 411. The north bridge 408 includes a memory controller that controls access to the main memory 406. The north bridge 408 has a function of executing communication with the graphics controller 409 via an AGP bus or the like. The graphics controller 409 controls the LCD 351. The graphics controller 409 generates a video signal representing a display image to be displayed on the LCD 351 from the display data stored in the video memory 410. The display data is written into the video memory 410 under the control of the CPU 405.

  The south bridge 411 controls devices on the LPC bus. The south bridge 411 includes an ATA controller for controlling the hard disk drive 404. Further, the south bridge 411 has a function for controlling access to the BIOS-ROM 407. An embedded controller / keyboard controller IC (EC / KBC) 412 is a one-chip microcomputer in which an embedded controller and a keyboard controller are integrated. The embedded controller controls the power supply controller 413 to power on / off the information processing apparatus 30 in accordance with the operation of the power switch 303 by the user. The keyboard controller controls the keyboard 301 and the touch pad 302. The power controller 413 controls the operation of a power device (not shown). The power supply device generates operating power for each unit of the computer 30.

  The close proximity wireless communication device 414 is a communication module for executing close proximity wireless communication. The close proximity wireless transfer device 414 includes a PHY / MAC unit 414a. The PHY / MAC unit 414a operates under the control of the CPU 405. The PHY / MAC unit 414a transmits and receives signals wirelessly via the coupler 1. The close proximity wireless transfer device 414 is accommodated in the housing of the main body 300.

  Note that data transfer between the close proximity wireless transfer device 414 and the south bridge 411 is performed via, for example, a PCI (peripheral component interconnect) bus. Note that PCI Express may be used instead of PCI.

  As described above, the close proximity wireless transfer device 414 and the coupler 1 may be built in the card device 306.

  Here, the computer 30 has been described as an example of an electronic device on which the coupler 1 is mounted. However, the electronic device may be a TV, for example. The coupler 1 is disposed in the TV casing. If the TV has a card slot, a card containing the coupler 1 or a card containing both the coupler 1 and the proximity wireless communication device 414 may be inserted into the card slot.

  Next, some configuration examples of the card device 306 will be described with reference to FIGS.

  FIG. 18 shows a first configuration example of the card device 306. In the casing of the card device 306, a substrate (dielectric substrate) 500 such as a printed circuit board is provided. In the first region on the first surface of the substrate 500, the coupling element 11, the feeding element 13, and the short-circuit element 15 are arranged. A proximity wireless communication device 414 is disposed in the second region on the first surface of the substrate 500. In the second area, a nonvolatile memory or the like may be provided in addition to the close proximity wireless transfer device 414. On the second surface (back surface) of the substrate 500, a ground layer as the ground plane 12 is disposed in a third region that is not opposed to the first region. The power supply terminal 14 may be provided on either the first surface side or the second surface side. The short-circuit element 15 and the ground plane 12 are connected through a through hole in the substrate 500. Some ground pins of the close proximity wireless transfer device 414 are connected to the ground plane 12 through through holes in the substrate 500.

  FIG. 19 shows a second configuration example of the card device 306. In FIG. 19, the coupling element 11, the power feeding element 13, and the short-circuit element 15 are disposed on the second front surface (back surface).

  FIG. 20 shows a fourth configuration example of the card device 306. In FIG. 21, as compared with the configuration of FIG. 18, only a part of each of the feeding element 13 and the short-circuit element 15 is provided in the first region on the first surface of the substrate 500, The only difference is that this portion is provided on the second surface of the substrate 500.

  FIG. 21 shows a third configuration example of the card device 306. In FIG. 20, the coupling element 11, the feeding element 13, and the short-circuit element 15 are arranged in the first region on the first surface of the substrate 500. The ground plane 12 is disposed in the second region on the first surface of the substrate 500. A proximity wireless communication device 414 is arranged in a third region on the second surface (back surface) of the substrate 500 facing the second region.

  As described above, in the present embodiment, one end of the power feeding element 13 is connected to the intermediate portion A1 of the coupling element 11, and one end of the short circuit element 15 is disposed between one end and the other end of the power feeding element 13. Since the other end of the short-circuit element 15 is connected to the ground plane 12, it is possible to prevent the coupler 1 from flowing currents in the opposite directions with the same amount of current, that is, the displacement tolerance of the coupler 1 The high impedance of the coupler 1 can be achieved without weakening. Therefore, it is possible to easily realize both the reduction of the influence due to the peripheral parts and the sufficient tolerance against the displacement.

  The resonance frequency of the coupler 1 is determined based on the length of L1 + L2 described above. In order to adjust the resonance frequency of the coupler 1, an inductor or the like is provided between the coupling element 11 and the feeding point 14 in FIG. These elements may be added. FIG. 22 shows an example in which an inductor L is inserted in series as a resonance frequency adjusting element between the feeding point 14 and the coupling element 11. In FIG. 22, an inductor L is inserted in the power feeding element 13. Of course, the entire feeding element 13 may be constituted by the inductor L. FIG. 23 shows an example in which an inductor L is inserted in series with the short-circuit element 15. FIG. 24 shows an example in which an inductor L is inserted in series between the coupling element 11 and the feed point 14, that is, the feed element 13, and an inductor L is inserted in series in the short-circuit element 15.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Coupler, 11 ... Coupling element, 12 ... Ground plane, 13 ... Feeding element, 15 ... Short circuit element

Claims (6)

A card device that can be inserted into a card slot of an electronic device,
A coupler that is used in proximity wireless communication in the card device, and includes a coupler that transmits and receives electromagnetic waves by electromagnetic coupling with other couplers,
The coupler is
A linear coupling element having a first open end and a second open end;
With the main plate,
A feeding element that connects the coupling element and a feeding point, and is connected to the feeding point and a first end connected to an intermediate portion of the coupling element between the first open end and the second open end. A feeding element comprising a second end formed;
A first short-circuit element that connects the power feeding element and the ground plane, and a third end that is between the first end and the second end of the power feeding element, and a fourth terminal that is connected to the ground plane. A first short-circuit element comprising an end;
A second short-circuit element for connecting the power feeding element and the ground plane, a fifth end between the first end and the second end of the power feeding element, and a sixth short-circuit element connected to the ground plane. And a second short-circuit element having an end.   2. The card device according to claim 1, wherein an electrical length from the feeding point to each of the first open end and the second open end is ¼ of a wavelength corresponding to a center frequency of the electromagnetic wave. The coupler is
Further comprising a substrate,
The coupling element is in a first region on a first surface of the substrate;
The ground plane is in a second region on the first surface of the substrate or in a third region on the second surface of the substrate, and the third region on the second surface is a second region on the second surface. 2. The card device according to claim 1, wherein three areas and the first area on the first surface are separated from the first area on the first surface when projected onto a single plane. A housing with a card slot;
A card device that can be inserted into the card slot, the card device comprising a coupler that is used in proximity wireless communication and that transmits and receives electromagnetic waves by electromagnetic coupling with other couplers;
A communication module in the card device or in the housing and electrically connected to the coupler;
A processor in the housing for executing an application for performing communication control using the communication module;
The coupler is
A linear coupling element having a first open end and a second open end;
With the main plate,
A feeding element that connects the coupling element and a feeding point, and is connected to the feeding point and a first end connected to an intermediate portion of the coupling element between the first open end and the second open end. A feeding element comprising a second end formed;
A first short-circuit element that connects the power feeding element and the ground plane, and a third end that is between the first end and the second end of the power feeding element, and a fourth terminal that is connected to the ground plane. A first short-circuit element comprising an end;
A second short-circuit element for connecting the power feeding element and the ground plane, a fifth end between the first end and the second end of the power feeding element, and a sixth short-circuit element connected to the ground plane. An electronic apparatus comprising: a second short-circuit element including an end. The card device includes one end where a connector is disposed, and the other end.
The electronic device according to claim 4, wherein the coupler is disposed in the card device so that the coupling element is positioned on the other end side. The coupler is
Further comprising a substrate,
The coupling element is in a first region on a first surface of the substrate;
The ground plane is in a second region on the first surface of the substrate or in a third region on the second surface of the substrate, and the third region on the second surface is a second region on the second surface. 5. The electronic device according to claim 4, wherein three regions and the first region on the first surface are separated from the first region on the first surface when projected onto a single plane.

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