JP2012044715A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress variation in transmission coefficients involved in rotation of a coupler about a central axis.SOLUTION: According to an embodiment, a communication device comprises a coupler, a communication device, and a feeder. The communication device communicates with other communication equipment using electromagnetic coupling between the coupler and another coupler. The feeder connects the coupler and the communication device. The coupler further comprises a dielectric material, first to third conductive members, a ground plane, and first and second short-circuit members. The first conductive member is provided on a first surface of the dielectric material, and is connected to the feeder at a reference point. The second and third conductive members are provided on the first surface so as to interpose the first conductive member therebetween. The first short-circuit element contacts the second conductive member in a first position, and short-circuits the ground plane and the second conductive member provided on a second surface of the dielectric material. The second short-circuit element contacts the third conductive member in a second position which is diametrically opposed to the first position with respect to the reference point, and short-circuits the third conductive member and the ground plane.

Description

  The present invention relates to a communication device.

  Development of TransferJet, which is a close proximity wireless communication method between two communication devices close to a distance of several centimeters, is in progress.

  When performing communication using this type of proximity wireless communication system, two communication devices are placed close to each other so that coupler devices mounted on the two communication devices face each other. And a coupler apparatus transmits / receives electromagnetic waves using electromagnetic coupling.

  In general, a coupler apparatus is configured by disposing a coupling element formed of a conductive material in a flat plate shape and a ground plane so as to face each other. In the coupler device on the transmission side, a signal is fed between the coupling element and the ground plane to generate a current in the coupling device and an electromagnetic field around the coupler device, and between the coupler device on the reception side. Cause electromagnetic coupling. In the coupler apparatus on the receiving side, the above signal can be taken out according to the potential difference between the coupling element and the ground plane when current is generated in the coupling element due to the electromagnetic coupling generated as described above.

  In this type of coupler apparatus, an electromagnetic coupling relating to a required frequency band is generated by a current generated between the feeding point and the open end.

  On the other hand, a short-circuit element may be disposed between the coupling element and the ground plane to short-circuit the coupling element and the ground plane. In this case, the short-circuit element is provided at one place avoiding the current path between the feeding point and the open end.

JP 2006-197449 A

  In the coupler apparatus provided with the above-described short-circuit element, a current that flows between the feeding point and the short-circuit element also occurs on the coupling element. Since this current is larger than the current between the feeding point and the open end and is generated in a state biased in one direction from the feeding point, the current distribution as a whole of the coupler apparatus is biased. Arise. Such a bias in current distribution may reduce the degree of coupling with other coupler apparatuses.

  Patent Document 1 describes an antenna device in which two short-circuit pins are provided between a top plate conductor and a ground plane conductor.

  However, in the antenna device described in Patent Document 1, the short-circuit pin is arranged in the middle of the path of the current flowing through the top plate conductor. This is because the antenna device described in Patent Document 1 is configured so as to be non-directional in a plane where the top plate conductor exists and not to radiate radio waves in a direction perpendicular to the top plate conductor. This is because an electromagnetic action that is completely different from that of a coupler apparatus that generates electromagnetic coupling in a direction perpendicular to the coupling element is used.

  For these reasons, it has been desired to suppress the change in the transmission coefficient accompanying the rotation of the coupler apparatus around the central axis even when the central axes of the coupler apparatus are deviated from each other.

  The communication apparatus according to the embodiment includes a coupler apparatus, a communication device, and a feeder line. The communication device communicates with other communication devices by using electromagnetic coupling between the coupler apparatus and another coupler apparatus. The feeder line connects the coupler apparatus and the communication device. The coupler apparatus further includes a dielectric, first to third conductive portions, a ground plane, and first and second short-circuit portions. The dielectric has first and second surfaces. The first conductive part is provided on the first surface, and a power supply line is connected at the reference point. The second and third conductive portions are respectively provided at positions where the first conductive portion is sandwiched between the first surface and the first surface. The ground plane is provided on the second surface. The first short-circuit element is in contact with the second conductive portion at the first position, and short-circuits the second conductive portion and the ground plane. The second short-circuit element is in contact with the third conductive portion at a second position symmetrical to the first position with the reference point as the center, and short-circuits the third conductive portion and the ground plane.

  According to the embodiment, even if the central axis of the coupler apparatus is shifted from each other, it is possible to suppress a change in the transmission coefficient due to the rotation of the coupler apparatus around the central axis.

The perspective view of the coupler apparatus which concerns on 1st Embodiment. The top view of the coupler apparatus shown in FIG. AA arrow sectional drawing in FIG. The disassembled perspective view of the coupler apparatus shown in FIG. FIG. 4 is a perspective view illustrating an appearance of an information processing apparatus as an example of a device on which the coupler apparatus illustrated in FIGS. 1 to 3 is mounted. FIG. 6 is a block diagram of the information processing apparatus shown in FIG. 5. The figure which shows the conditions which obtain | require the frequency characteristic of the transmission coefficient (S21) between two coupler apparatuses. The figure which shows the simulation data regarding the frequency characteristic of the transmission coefficient (S21) between the coupler apparatuses shown in FIG. 1 thru | or FIG. The top view of the coupler apparatus which concerns on 2nd Embodiment. The figure which shows the simulation data regarding the frequency characteristic of the transmission coefficient (S21) between the coupler apparatuses shown in FIG. The top view of the coupler apparatus which concerns on 3rd Embodiment. The figure which shows the simulation data regarding the frequency characteristic of the transmission coefficient (S21) between the coupler apparatuses shown in FIG. The top view of the coupler apparatus which concerns on 4th Embodiment. The figure which shows the simulation data regarding the frequency characteristic of the transmission coefficient (S21) between the coupler apparatuses shown in FIG. The top view of the coupler apparatus which concerns on 5th Embodiment. The top view of the coupler apparatus which concerns on 6th Embodiment. The top view of the coupler apparatus which concerns on 7th Embodiment. The disassembled perspective view of the coupler apparatus shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of a coupler apparatus 2 according to the first embodiment. FIG. 2 is a plan view of the coupler apparatus 2. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is an exploded perspective view of the coupler apparatus 2.

  As shown in FIGS. 1 to 4, the coupler apparatus 2 includes a coupling element 21, short-circuit elements 22 and 23, a ground plane 24, and a dielectric 25. As shown in FIG. 3, the coupler apparatus 2 further includes a feeder line 26 and a connector 27.

  The coupling element 21, the ground plane 24, and the dielectric 25 are all flat, and in the order of the coupling element 21, the dielectric 25, and the ground plane 24 in the thickness direction, with the thickness directions being substantially the same. It is arranged. In the following description, the arrangement direction (thickness direction / height direction) of the coupling element 21, the dielectric 25, and the ground plane 24 is defined as the front / back direction of the coupler apparatus 2, and the coupling element 21 side is defined as the front side. . That is, the coupling element 21 is located on the front side of the dielectric 25 and the ground plane 24 is located on the back side of the dielectric 25.

  The coupling element 21 is formed by forming a conductive material into a shape as shown in FIGS. The coupling element 21 has a cross shape on a plane orthogonal to the thickness direction. That is, the coupling element 21 includes four rectangular portions 21a, 21b, 21c, and 21d that extend in four different directions from the center. It is desirable that the rectangular portion 21a and the rectangular portion 21b have the same length, but this is not an essential requirement. Further, it is desirable that the rectangular portion 21c and the rectangular portion 21d have the same length, but this is not an essential requirement. Both rectangular portions 21a and 21b have such a width that a high-frequency signal exchanged with another coupler apparatus flows over almost the entire area.

  Thus, the rectangular portions 21c and 21d form a first conductive portion having two end portions E3 and E4. The rectangular portions 21a and 21b form second and third conductive portions having open ends E1 and E2, respectively. The open ends E1 and E2 are in symmetrical positions with respect to the centers of the end E3 and the end E4.

  The short-circuit elements 22 and 23 are formed by forming a conductive material into a rectangular flat plate shape, and the thickness direction thereof is orthogonal to the thickness direction of the coupling element 21. The short-circuit elements 22 and 23 are joined to the coupling element 11 at the tips of the rectangular portions 21c and 21d, respectively. The short-circuit elements 22 and 23 may be integrated with the coupling element 21 or may be separate. The short-circuit elements 22 and 23 are disposed so as to pass through the inside of the dielectric 25 and are electrically connected to the ground plane 24.

  The ground plane 24 is formed with a thin layer made of a conductive material on almost the entire surface of the dielectric 25, and functions as a ground electrode. The ground plane 24 may be electrically connected to a metal casing or the like of a communication device in which the coupler apparatus 2 is mounted, or such a connection may not be made. The ground plane 24 is separated from the coupling element 21 to such an extent that no direct conduction between the coupling element 21 and the short-circuit elements 22 and 23 does not occur. The base plate 24 is formed with rectangular cutout portions 24 a and 24 b so as to penetrate the base plate 24 in the front and back direction. The notches 24 a and 24 b are in the vicinity of a region in the ground plane 24 facing at least a part of the coupling element 21.

  The projection area (area facing the coupling element 21) when the coupling element 21 is projected in the front-back direction on the front side surface of the ground plane 24 is an area AR1 indicated by a two-dot chain line in FIG. From FIG. 4, since a part of the areas AR1a and AR1b corresponding to the rectangular parts 21a and 21b in the area AR1 overlaps the notched parts 24a and 24b, the notched part is opposed to a part of the rectangular parts 21a and 21b. It can be seen that 24a and 24b are provided, that is, the notches 24a and 24b are provided in the vicinity (adjacent regions) of the regions AR1a and AR1b. Further, since the vicinity of the intersection in the area AR1 does not overlap any of the notches 24a and 24b, it can be seen that the notches 24a and 24b do not face the feeding point P1. Furthermore, since the areas AR1c and AR1d corresponding to the rectangular portions 21c and 21d in the area AR1 do not overlap any of the notches 24a and 24b, it can be seen that the short-circuit elements 22 and 23 can contact the ground plane 24. .

  The dielectric 25 is formed by forming a dielectric material into a plate shape. The dielectric 25 is disposed in the gap between the coupling element 21 and the ground plane 24. In the first embodiment, the dielectric 25 has a thickness substantially equal to the distance between the coupling element 21 and the ground plane 24 and substantially fills the gap between the coupling element 21 and the ground plane 24. Therefore, most of the short-circuit elements 22 and 23 are located inside the dielectric 25. However, the thickness of the dielectric 25 may be smaller than the distance between the coupling element 21 and the ground plane 24. When the thickness of the dielectric 25 is smaller than the distance between the coupling element 21 and the ground plane 24, the dielectric 25 is typically disposed in contact with the ground plane 24 and separated from the coupling element 21. However, the dielectric 25 may be disposed in contact with the coupling element 21 and spaced from the ground plane 24. Alternatively, the dielectric 25 may be disposed in a state of being separated from both the coupling element 21 and the ground plane 24. Furthermore, a first dielectric that contacts the coupling element 21 and a second dielectric that contacts the ground plane 24 may be provided, and the first and second dielectrics may be arranged apart from each other. The dielectric 25 is formed with U-shaped notches 25a and 25b so as to penetrate the dielectric 25 in the front and back direction. The notches 25 a and 25 b are in the vicinity of a region in the dielectric 25 that faces at least a part of the coupling element 21.

  In the present embodiment, the notches 25a and 25b are U-shaped, but other shapes may be used. The shape of the notches 24a and 24b provided on the main plate 24 may also be arbitrary.

  The projection area (area facing the coupling element 21) when the coupling element 21 is projected in the front-back direction on the surface side of the dielectric 25 is an area AR2 indicated by a two-dot chain line in FIG. From FIG. 4, the regions AR2a, AR2b, AR2c, and AR2d corresponding to the rectangular portions 21a, 21b, 21c, and 21d in the region AR2 do not overlap with the notches 25a and 25b, and thus do not face all of the coupling elements 21. Thus, it can be seen that the notches 25a and 25b are provided.

  The feeder line 26 is arranged in a state of passing through the ground plane 24 and the dielectric 25. One end of the power supply line 26 is connected to the power supply point P <b> 1 at the center of the coupling element 21, and the other end is connected to the connector 27. The feeder line 26 is insulated from the ground plane 24.

  The connector 27 is fixed to the ground plane 24 by, for example, soldering. The connector 201 is coupled to the connector 27 when the coupler apparatus 2 is mounted on a communication device. The connector 201 is connected to a transmission / reception circuit 202 mounted on the communication device via a cable 203. The connectors 27 and 201 electrically connect the power supply line 26 and the power supply line of the cable 203 and also connect the ground line of the cable 203 and the ground plane 24 in a state of being coupled to each other.

  1 to 4, the coupler apparatus 2 supplies power to the power supply point P1 via the connector 27 provided on the ground plane 24 side. However, the power supply method and the mounting method are not limited to this. Absent. For example, it is also possible to mount the coupler apparatus 2 as a board integrated with the transmission / reception circuit 202, and to feed power to the feeding point P1 on the coupling element 21 side as a pattern of the board. Moreover, you may connect the feeder of the cable 203 directly to the feeding point P1 and the ground plane 24, without using a connector.

  FIG. 5 is a perspective view showing an appearance of the information processing apparatus 30 as an example of a device on which the coupler apparatus 2 is mounted. The information processing apparatus 30 is realized as a notebook-type portable personal computer that can be driven by a battery, for example.

  The information processing apparatus 30 includes a main body 300 and a display unit 350. The display unit 350 is supported by the main body 300 in a rotatable state. The display unit 350 may form an open state in which the upper surface of the main body 300 is exposed and a closed state that covers the upper surface of the main body 300. The display unit 350 is provided with an LCD (liquid crystal display) 351.

  The main body 300 has a thin box-shaped housing. The main body 300 is provided with a keyboard 301, a touch pad 302, a power switch 303, and the like in a state where the main body 300 is exposed to the outside of the casing from the upper surface of the casing. Further, the main body 300 is provided with the coupler apparatus 2 inside the casing. The direction of the coupler apparatus 2 in the main body 300 may be arbitrary. However, typically, the front and back directions in FIG. 1 are made to coincide with the direction orthogonal to the upper surface of the housing of the main body 300. Typically, the coupling element 21 is positioned closer to the upper surface of the housing of the main body 300 than the ground plane 24.

  The coupler apparatus 2 is used to perform close proximity wireless communication between the information processing apparatus 30 and another apparatus (not shown). Proximity wireless communication is performed in a peer-to-peer format. The communicable distance is, for example, about 3 cm. The wireless connection between the communication terminals is possible only when the distance between the coupler apparatuses 2 mounted on both communication terminals approaches within a communicable distance. And when the two coupler apparatuses 2 approach within the communicable distance, the wireless connection between the two communication terminals is established. Data such as a data file designated by the user or a predetermined data file to be synchronized is transmitted and received between the two communication terminals.

  In the example illustrated in FIG. 5, the coupler apparatus 2 is disposed under a region functioning as a palm rest (hereinafter referred to as a palm rest region) on the upper surface of the main body 300. Thus, a part of the palm rest area functions as a communication surface. That is, the wireless connection between the communication terminal and the information processing apparatus 30 can be established by bringing another communication terminal that is to perform close proximity wireless communication with the information processing apparatus 30 close to the palm rest area.

  FIG. 6 is a block diagram of the information processing apparatus 30. The same parts as those in FIG. 5 are denoted by the same reference numerals.

  In addition to the coupler device 2, the keyboard 301, the touch pad 302, the power switch 303, and the LCD 351, the information processing device 30 includes a hard disk drive (HDD) 304, a CPU 305, a main memory 306, a BIOS (basic input / output system) -ROM 307, A north bridge 308, a graphics controller 309, a video memory (VRAM) 310, a south bridge 311, an embedded controller / keyboard controller IC (EC / KBC) 312, a power supply controller 313, and a proximity wireless communication device 314 are included.

  The hard disk drive 304 stores codes for executing various programs such as an operating system (OS) and a BIOS update program.

  The CPU 305 executes various programs loaded from the hard disk drive 304 to the main memory 306 in order to control the operation of the information processing apparatus 30. Programs executed by the CPU 305 include an operating system 401, a proximity wireless communication gadget application program 402, an authentication application program 403, or a transmission tray application program 404.

  The CPU 305 executes a BIOS program stored in the BIOS-ROM 307 for hardware control.

  The north bridge 308 connects the local bus of the CPU 305 and the south bridge 311. The north bridge 308 includes a memory controller that controls access to the main memory 306. The north bridge 308 has a function of executing communication with the graphics controller 309 via an AGP bus or the like.

  The graphics controller 309 controls the LCD 351. The graphics controller 309 generates a video signal representing a display image to be displayed on the LCD 351 from the display data stored in the video memory 310. The display data is written into the video memory 310 under the control of the CPU 305.

  The south bridge 311 controls devices on the LPC bus. The south bridge 311 incorporates an ATA controller for controlling the hard disk drive 304. Further, the south bridge 311 has a function for controlling access to the BIOS-ROM 307.

  An embedded controller / keyboard controller IC (EC / KBC) 312 is a one-chip microcomputer in which an embedded controller and a keyboard controller are integrated. The embedded controller controls the power supply controller 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 313 controls the operation of a power device (not shown). The power supply device generates operating power for each unit of the information processing device 30.

  The close proximity wireless transfer device 314 includes a PHY / MAC unit 314a. The PHY / MAC unit 314a operates under the control of the CPU 305. The PHY / MAC unit 314a communicates with other communication terminals via the coupler apparatus 2. The close proximity wireless transfer device 314 corresponds to the transmission / reception circuit 202 in FIG. The close proximity wireless transfer device 314 is accommodated in the housing of the main body 300.

  Data transfer between the close proximity wireless transfer device 314 and the south bridge 311 is performed by a PCI (peripheral component interconnect) bus. Note that PCI Express may be used instead of PCI.

  Next, the operation of the coupler apparatus 2 configured as described above will be described.

  When a high frequency signal is transmitted from the transmission / reception circuit 202, the high frequency signal is supplied to the feeding point P1 of the coupling element 21 via the cable 203, the connector 201, the connector 27, and the feeding line 26. At this time, the tip portions E1 and E2 of the rectangular portions 21a and 21b are respectively open ends, and two current paths from the feeding point P1 to the tip portions E1 and E2 are generated. In addition, in rectangular part 21a, 21b, an electric current arises in the substantially whole region. Therefore, the current path in the rectangular portions 21a and 21b can be regarded as passing through the central portions of the rectangular portions 21a and 21b.

  The current generated as described above in the rectangular portions 21a and 21b of the transmission-side coupler device 2 becomes a coupling current, and electromagnetic waves are generated around the transmission-side coupler device 2. The electromagnetic wave induces a current in the coupling element 21 of the receiving-side coupler apparatus 2. In this way, high frequency signals are transmitted and received between the two coupler apparatuses 2. Here, the size of the coupling element 21 is determined so that the length of the two current paths substantially corresponds to n / 4 (n is an arbitrary integer) of the wavelength λ of the required frequency. Thereby, the high frequency signal of the frequency band which made said required frequency the center frequency can be transmitted / received efficiently.

  By the way, since the rectangular portions 21c and 21d are grounded to the ground plane 24 by the short-circuit elements 22 and 23, the tip portions E3 and E4 of the rectangular portions 21c and 21d are grounded ends, respectively. Then, two current paths from the feeding point P1 to the tip portions E3 and E4 are generated, and a ground current flows through the rectangular portions 21c and 21d. However, since the directions of these two ground currents are different from each other, the bias of the current distribution in the entire coupler apparatus 2 is smaller than that in the case where the ground end is single.

  In particular, in the present embodiment, since the rectangular portions 21c and 21d have a point-symmetric shape with respect to the feeding point P1, these two ground currents are also symmetric, and the current distribution in the entire coupler apparatus 2 due to these ground currents is almost the same. There is no bias.

  However, even if the rectangular portions 21c and 21d are not arranged in a straight line or the lengths of the rectangular portions 21c and 21d are different from each other, the rectangular portions 21c and 21d include the feeding point P1 and extend in the front and back direction. As compared with the conventional coupler apparatus 1, the bias of the current distribution can be reduced. Therefore, the shape in which the rectangular portions 21c and 21d are point-symmetric with respect to the feeding point P1 is not an essential requirement.

  The Q value increases as the rectangular portions 21c and 21d are shortened. That is, the shorter the rectangular portions 21c and 21d, the narrower the band of electromagnetic coupling and the higher the degree of coupling. For this reason, it is desirable that the lengths of the rectangular portions 21c and 21d are appropriately determined in consideration of the required bandwidth and the degree of coupling.

  In the use state as described above, since the ground plane 24 is grounded and the coupling element 21 and the ground plane 24 are close to each other, a part of the energy of the current generated in the coupling element 21 is supplied to the ground plane 24. It leaks directly. However, in the coupler apparatus 2, since the notches 24a and 24b are formed, the ground plane 24 does not face part of the rectangular portions 21a and 21b. For this reason, compared with the case where notch part 24a, 24b is not formed, the quantity of the energy leaked directly from the coupling element 21 to the ground plane 24 is reduced. Further, since the notches 25a and 25b are formed, the concentration of the electric field between the ground plane 24 and the coupling element 21 can be reduced as compared with the case where the notches 25a and 25b are not formed. As a result, the amount of energy used for electromagnetic coupling with the coupler apparatus of the communication partner increases, and the degree of coupling (S21) improves.

  For example, FIG. 8 shows simulation data relating to the frequency characteristics of the transmission coefficient (S21) when the two coupler apparatuses 2 face each other in the positional relationship shown in FIG. In addition, the positional relationship shown in FIG. 7 is based on the following conditions.

    -The surfaces of the two coupler devices face each other.

    The central axes of the two coupler devices are parallel to each other.

    The distance between the surfaces of the two coupler apparatuses in the direction along the central axis is 10 mm.

    -The distance between the central axes in the direction orthogonal to the central axis is 10 mm.

    A state in which the same grounding end faces the same direction is defined as 0 degree, and the coupler apparatus 1 located on the upper side of FIG. 7 is rotated around the central axis in the direction of arrow A1 from the state of 0 degree by 90 degrees. They are 90 degrees, 180 degrees, and 270 degrees, respectively.

(Second Embodiment)
FIG. 9 is a plan view of the coupler apparatus 3 according to the second embodiment. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the coupler apparatus 3 includes short-circuit elements 22 and 23, a ground plane 24, a dielectric 25, and a coupling element 31. The coupler apparatus 3 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG.

  That is, the coupler apparatus 3 includes a coupling element 31 instead of the coupling element 21 in the coupler apparatus 2. The coupling element 31 and the coupling element 21 have different shapes in a plane orthogonal to the thickness direction.

  The coupling element 31 has L-shaped portions 31a and 31b and rectangular portions 31c and 31d. The L-shaped portions 31a and 31b are L-shaped each having a bending angle of 90 degrees, and are point-symmetric with respect to the feeding point P2. The rectangular portions 31c and 31d each have a rectangular shape and are point-symmetric with respect to the feeding point P2. The rectangular portions 31c and 31d are orthogonal to the L-shaped portions 31a and 31b at the feeding point P2. Note that both L-shaped portions 31a and 31b have such a width that a high-frequency signal exchanged with another coupler apparatus flows over almost the entire area.

  Thus, the rectangular portions 31c and 31d form a first conductive portion having two tip portions E13 and E14. The rectangular portions 31a and 31b form second and third conductive portions having tip portions E11 and E12, respectively. And the front-end | tip parts E11 and E12 exist in the symmetrical position with respect to the center of the front-end | tip part E13 and the edge part E14.

  The short-circuit elements 22 and 23 are joined to the coupling element 31 at the ends of the rectangular portions 31c and 31d, respectively.

  In this coupling element 31, the tip portions E11 and E12 of the L-shaped portions 31a and 31b are open ends, and the tip portions E13 and E14 of the rectangular portions 31c and 31d are ground ends. For this reason, the coupling element 31 has a current path extending from the feeding point P2 along the L-shaped portion 31a to the tip end portion E11 and a current path extending from the feeding point P2 along the L-shaped portion 31b to the tip end portion E12. The size of the coupling element 31 is determined such that the length of these two current paths substantially corresponds to n / 4 of the wavelength λ of the required frequency (n is an arbitrary integer).

  Thus, in the coupling element 31 as well, since the directions of the ground currents flowing through the rectangular portions 31c and 31d are different from each other, the bias of the current distribution in the entire coupler apparatus 3 is smaller than that in the case where the ground end is single.

  In particular, in this embodiment, since the rectangular portions 31c and 31d have a point-symmetric shape with respect to the feeding point P2, the two ground currents are also symmetric, and the current distribution in the entire coupler apparatus 3 due to these currents is almost biased. Does not occur.

  By the way, the electromagnetic coupling between the two coupler devices 3 is realized mainly by the current generated in the L-shaped portions 31a and 31b. The coupling current generated in the L-shaped portions 31a and 31b is 90 as shown by the arrows in FIG. It contains current components in four different directions. Therefore, when the two coupler apparatuses 2 are opposed to each other in the positional relationship shown in FIG. 7, current components in opposite directions are included in both coupler apparatuses 2 at any of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. As a result, the change in the degree of coupling in each state is reduced.

  FIG. 10 is a diagram showing simulation data relating to the frequency characteristic of the transmission coefficient (S21) between the two coupler apparatuses 3. In FIG. In the characteristics shown in FIG. 10, the transmission coefficient (S21) when the two coupler apparatuses 3 are opposed to each other in the positional relationship shown in FIG. 7 is obtained by computer simulation.

  However, the current distribution in the entire coupler apparatus 3 is biased compared to the coupler apparatus 2 due to the current on the tip side of the L-shaped portions 31a and 31b. However, the coupling current in the L-shaped portions 31a and 31b is smaller than the ground current in the rectangular portions 31c and 31d, and further decreases as the coupling current approaches the tip portions E11 and E12. For this reason, the influence on the current distribution of the current on the tip side of the L-shaped portions 31a and 31b is small.

  The bending angle of the L-shaped portions 31a and 31b may be other than 90 degrees, and the bending angle of the L-shaped portions 31a and 31b may be different from each other. The L-shaped portions 31a and 31b may have different shapes. The angle formed by the L-shaped portions 31a and 31b at the feeding point P2 may be other than 180 degrees. However, the L-shaped portions 31a and 31b include the feeding point P2 and are located on the opposite sides of the plane along the front and back direction.

  On the other hand, the rectangular portions 31c and 31d may have different shapes. The angle formed by the rectangular portions 31c and 31d at the feeding point P2 may be other than 180 degrees. However, the L-shaped portions 31a and 31b include the feeding point P2 and are located on the opposite sides of the plane along the front and back direction.

(Third embodiment)
FIG. 11 is a plan view of the coupler apparatus 4 according to the third embodiment. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 11, the coupler apparatus 4 includes short-circuit elements 22 and 23, a ground plane 24, a dielectric 25, and a coupling element 41. The coupler apparatus 4 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG. 11.

  That is, the coupler apparatus 4 includes a coupling element 41 instead of the coupling element 21 in the coupler apparatus 2. The coupling element 41 and the coupling element 21 have different shapes on a plane orthogonal to the thickness direction.

  The coupling element 41 has L-shaped portions 41a and 41b and rectangular portions 41c and 41d. The L-shaped portions 41a and 41b are L-shaped each having a bending angle of 90 degrees, and are symmetrical with respect to a straight line L1 passing through the feeding point P3 on the plane. Each of the rectangular portions 41c and 41d has a rectangular shape and is point-symmetric with respect to the feeding point P3. The rectangular portions 41c and 41d are aligned on the straight line L1 along the straight line L1. Note that both L-shaped portions 41a and 41b have such a width that a high-frequency signal exchanged with other coupler apparatuses flows over almost the entire area.

  Thus, the rectangular portions 41c and 41d form a first conductive portion having two tip portions E23 and E24. The rectangular portions 41a and 41b form second and third conductive portions having tip portions E21 and E22, respectively.

  The short-circuit elements 22 and 23 are joined to the coupling element 41 at the ends of the rectangular portions 41c and 41d, respectively.

  In this coupling element 41, the tip portions E21 and E22 of the L-shaped portions 41a and 41b are open ends, and the tip portions E23 and E24 of the rectangular portions 41c and 41d are ground ends. For this reason, the coupling element 41 has a coupling current between a current path from the feeding point P3 along the L-shaped portion 41a to the tip E21 and a current path from the feeding point P3 to the tip E22 along the L-shaped portion 41b. Each occurs. The size of the coupling element 41 is determined so that the length of these two current paths substantially corresponds to n / 4 (n is an arbitrary integer) of the wavelength λ of the required frequency.

  Thus, also in the coupling element 41, since the directions of the ground currents generated in the rectangular portions 41c and 41d are different from each other, the bias of the current distribution in the entire coupler apparatus 4 is smaller than that in the case where the ground terminal is single.

  In particular, in the present embodiment, since the rectangular portions 41c and 41d are point symmetric about the feeding point P3, the two ground currents are also symmetric, and the current distribution in the entire coupler apparatus 4 due to these ground currents is almost biased. Absent.

  By the way, the electromagnetic coupling between the two coupler devices 4 is realized mainly by the coupling current generated in the L-shaped portions 41a and 41b. This coupling current has three directions different by 90 degrees as shown by arrows in FIG. Includes current component. Therefore, when the two coupler apparatuses 4 are opposed to each other in the positional relationship shown in FIG. 7, current components in opposite directions exist in both coupler apparatuses 2 at any of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. As a result, the change in the degree of coupling in each state is reduced.

  FIG. 12 is a diagram showing simulation data relating to the frequency characteristic of the transmission coefficient (S21) between the two coupler apparatuses 4. In FIG. In the characteristics shown in FIG. 12, the transmission coefficient (S21) when the two coupler apparatuses 4 are opposed to each other in the positional relationship shown in FIG. 7 is obtained by computer simulation.

  However, the current distribution in the entire coupler apparatus 4 is biased compared to the coupler apparatus 2 due to the current on the tip side of the L-shaped portions 41a and 41b. However, the coupling current in the L-shaped portions 41a and 41b is smaller than the ground current in the rectangular portions 41c and 41d, and further decreases as the coupling current approaches the tip portions E21 and E22. For this reason, the bias of the current distribution caused by the current on the tip side of the L-shaped portions 41a and 41b is smaller than the bias of the current distribution caused by the current toward the single ground end.

  Note that the bending angles of the L-shaped portions 41a and 41b may be other than 90 degrees, and the bending angles of the L-shaped portions 41a and 41b may be different from each other. The L-shaped portions 41a and 41b may have different shapes. The angle formed by the L-shaped portions 41a and 41b at the feeding point P3 may be other than 180 degrees. However, the L-shaped parts 41a and 41b include the feeding point P3 and are located on the opposite sides with respect to the plane along the front and back direction.

  On the other hand, the rectangular portions 41c and 41d may have different shapes. The angle formed by the rectangular portions 41c and 41d at the feeding point P3 may be other than 180 degrees. However, the L-shaped parts 41a and 41b include the feeding point P3 and are located on the opposite sides with respect to the plane along the front and back direction.

(Fourth embodiment)
FIG. 13 is a plan view of the coupler apparatus 5 according to the fourth embodiment. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 13, the coupler apparatus 5 includes short-circuit elements 22 and 23, a ground plane 24, a dielectric 25, and a coupling element 51. The coupler apparatus 5 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG.

  That is, the coupler apparatus 5 includes a coupling element 51 instead of the coupling element 21 in the coupler apparatus 2. The coupling element 51 and the coupling element 21 have different shapes on a plane orthogonal to the thickness direction.

  The coupling element 51 has rectangular portions 51a, 51b, 51c, 51d, and 51e. The rectangular portions 51a and 51b each have a rectangular shape and are parallel to each other while being separated from each other. The rectangular portion 51c is rectangular and extends along the arrangement direction of the rectangular portions 51a and 51b so as to connect the central portions of the rectangular portions 51a and 51b. The rectangular portions 51d and 51e each have a rectangular shape and are arranged in a straight line with the feeding point P4 interposed therebetween. Note that all of the rectangular portions 51a, 51b, and 51c have such a width that a high-frequency signal exchanged with another coupler apparatus flows over almost the entire area.

  Thus, the rectangular portions 51d and 51e form a first conductive portion having two tip portions E35 and E36. Further, the rectangular portion 51a and a part of the rectangular portion 51c have conductive portions having tip portions E31 and E32, and the rectangular portion 51b and a portion of the rectangular portion 51c have conductive portions having tip portions E33 and E34, respectively. Is formed. And the front-end | tip parts E31, E32, E33, E34 are in the symmetrical position with respect to the center of the front-end | tip part E35 and the front-end | tip part E36.

  The short-circuit elements 22 and 23 are joined to the coupling element 51 at the tips of the rectangular portions 51d and 51e, respectively.

  In this coupling element 51, the tip portions E31, E32, E33, E34 of the rectangular portions 51a, 51b are open ends, and the tip portions E35, E36 of the rectangular portions 51d, 51e are ground ends. For this reason, the coupling element 51 includes two current paths extending from the feeding point P4 to the distal end portions E31 and E32 along the rectangular portion 51c and the rectangular portion 51a, and the distal end portion along the rectangular portion 51c and the rectangular portion 51b from the feeding point P4. A coupling current is generated in each of the two current paths extending to E33 and E34. The size of the coupling element 51 is determined so that the lengths of these four current paths substantially correspond to n / 4 (n is an arbitrary integer) of the wavelength λ of the required frequency.

  Thus, also in the coupling element 51, since the directions of the ground currents generated in the rectangular portions 51d and 51e are different from each other, the bias of the current distribution in the entire coupler apparatus 5 is smaller than that in the case where the ground terminal is single.

  In particular, in the present embodiment, since the rectangular portions 51d and 51e are symmetric with respect to the feeding point P4, the two ground currents are also symmetric, and the current distribution in the entire coupler apparatus 4 due to these ground currents is almost biased. Absent.

  By the way, the electromagnetic coupling between the two coupler devices 5 is realized mainly by the coupling current generated in the rectangular portions 51c, 51d, 51e. This coupling current includes four directions different by 90 degrees as indicated by arrows in FIG. Current component. Therefore, when the two coupler apparatuses 5 are opposed to each other in the positional relationship shown in FIG. 7, current components in opposite directions exist in both coupler apparatuses 2 at any of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. As a result, the change in the degree of coupling in each state is reduced.

  FIG. 14 is a diagram showing simulation data relating to the frequency characteristic of the transmission coefficient (S21) between the two coupler apparatuses 5. FIG. With respect to the characteristics shown in FIG. 14, the transmission coefficient (S21) when the two coupler apparatuses 5 are opposed to each other in the positional relationship shown in FIG. 7 is obtained by computer simulation.

(Fifth embodiment)
FIG. 15 is a plan view of the coupler apparatus 6 according to the fifth embodiment. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 15, the coupler apparatus 6 includes short-circuit elements 22 and 23, a ground plane 24, a dielectric 25, and a coupling element 61. The coupler apparatus 6 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG.

  That is, the coupler apparatus 6 includes a coupling element 61 instead of the coupling element 21 in the coupler apparatus 2. The coupling element 61 and the coupling element 21 are different in shape on a plane orthogonal to the thickness direction.

  The coupling element 61 includes rectangular portions 61a, 61b, 61c and U-shaped portions 61d, 61e. The rectangular portions 61a and 61b each have a rectangular shape and are parallel to each other while being separated from each other. The rectangular portion 61c is rectangular and extends along the arrangement direction of the rectangular portions 61a and 61b so as to connect the central portions of the rectangular portions 61a and 61b. The U-shaped portions 61d and 61e each have a U-shape, and both ends thereof are in contact with the rectangular portion 61c. The U-shaped portions 61d and 61e are point-symmetric with respect to the feeding point P5. Note that the rectangular portions 61a, 61b, and 61c all have a width that allows a high-frequency signal exchanged with another coupler apparatus to flow over almost the entire area.

  Thus, the U-shaped portions 61d and 61e form a first conductive portion having two ends E45 and E46. Further, the rectangular portion 61a and a part of the rectangular portion 61c have conductive portions having tip portions E41 and E42, and the rectangular portion 61b and a portion of the rectangular portion 61c have conductive portions having tip portions E43 and E44, respectively. Is formed. And the front-end | tip part E41, E42, E43, E44 exists in the symmetrical position with respect to the center of the edge part E45 and the edge part E46.

  The short-circuit elements 22 and 23 are joined to the coupling element 61 at intermediate portions of the U-shaped portions 61d and 61e, respectively.

  In the coupling element 61, the end portions E41, E42, E43, and E44 of the rectangular portions 61a and 61b are open ends, and the end portions E45 and E46 of the U-shaped portions 61d and 61e are ground ends. For this reason, the coupling element 61 includes two current paths from the feeding point P5 to the tip portions E41 and E42 along the rectangular portion 61c and the rectangular portion 61a, and the tip portion along the rectangular portion 61c and the rectangular portion 61b from the feeding point P5. A coupling current is generated in each of the two current paths extending to E43 and E44. The size of the coupling element 61 is determined so that the lengths of these four current paths substantially correspond to n / 4 (n is an arbitrary integer) of the wavelength λ of the required frequency.

  Thus, also in the coupling element 61, since the directions of the ground currents generated in the U-shaped portions 61d and 61e are different from each other, the bias of the current distribution in the entire coupler apparatus 6 is smaller than that in the case where the ground terminal is single.

  In particular, in this embodiment, since the U-shaped portions 61d and 61e are point symmetric about the feeding point P5, the two ground currents are also symmetric, and the current distribution in the entire coupler apparatus 6 due to these ground currents is almost biased. Does not occur.

  Incidentally, the electromagnetic coupling between the two coupler devices 6 is realized mainly by the coupling current generated in the rectangular portions 61c, 61d, 61e. This coupling current has four directions different by 90 degrees as shown by arrows in FIG. Current component. For this reason, when two coupler apparatuses 6 are opposed to each other in the positional relationship shown in FIG. 7, current components in opposite directions exist in both coupler apparatuses 2 at any of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. As a result, the change in the degree of coupling in each state is reduced.

(Sixth embodiment)
FIG. 16 is a plan view of the coupler apparatus 7 according to the sixth embodiment. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 16, the coupler apparatus 7 includes short-circuit elements 22, 23, 72, 73, a ground plane 24, a dielectric 25, and a coupling element 71. The coupler apparatus 7 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG.

  That is, the coupler apparatus 7 includes a coupling element 71 instead of the coupling element 21 in the coupler apparatus 2 and additionally includes short-circuit elements 72 and 73. The coupling element 71 and the coupling element 21 have different shapes on a plane orthogonal to the thickness direction.

  The coupling element 71 has rectangular portions 71a, 71b, 71c, 71d, 71e, and 71f. The rectangular portions 71c, 71d, 71e, 71f are in a positional relationship to form a cross shape by them. The rectangular portions 71a and 71b are positioned in a state extending from the cross-shaped intersection point in a direction different from any other rectangular portion. In addition, both the rectangular parts 71a and 71b shall have the width | variety which the high frequency signal transmitted / received between other coupler apparatuses flows over substantially the whole region.

  Thus, the rectangular portions 71c and 71d form a first conductive portion having two tip portions E53 and E54. The rectangular portions 71a and 71b form a second conductive portion having a tip E5. Further, the rectangular portions 71e and 71f form a third conductive portion having two tip portions E55 and E56.

  The short-circuit elements 22, 23, 72, 73 are joined to the coupling element 71 at the tips of the rectangular portions 71c, 71d, 71e, 71f, respectively. The short-circuit elements 72 and 73 are also connected to the ground plane 24 in the same manner as the short-circuit elements 22 and 23. The feed line 26 is connected to the coupling element 71 in the vicinity of the tip E52 of the rectangular portion 71b, and a feed point P6 is formed in the vicinity of the tip E52.

  In this coupling element 71, the front end portion E51 of the rectangular portion 71a is an open end, and the front end portions E53, E54, E55, and E56 of the rectangular portions 71c, 71d, 71e, and 71f are ground ends. For this reason, the coupling element 71 generates a coupling current in a current path from the feeding point P6 to the tip end portion E51 along the rectangular portion 71b and the rectangular portion 71a. The size of the coupling element 71 is determined so that the length of the current path substantially corresponds to n / 4 (n is an arbitrary integer) of the wavelength λ of the required frequency.

  The ground current has four current paths from the cross-shaped intersections to the tip portions E53, E54, E55, and E56, and the ground current flows through the rectangular portions 71c, 71d, 71e, and 71f. Since the directions of the ground currents are different from each other, the bias of the current distribution in the entire coupler apparatus 7 is smaller than that in the case where the ground terminal is single.

  In particular, in the present embodiment, since the rectangular portions 71c, 71d, 71e, 71f are point-symmetric with respect to the cross-shaped intersection, the four ground currents are also symmetric, and the current distribution in the entire coupler apparatus 4 due to these ground currents. There is almost no bias.

(Seventh embodiment)
FIG. 17 is a plan view of the coupler apparatus 8 according to the seventh embodiment. 1 to 3 and FIG. 13 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 17, the coupler apparatus 8 includes short-circuit elements 22 and 23, a ground plane 24, a dielectric 25, a coupling element 51, parasitic elements 81 and 82, and short-circuit elements 83 and 84. Further, the coupler apparatus 8 further includes a power supply line 26 and a connector 27 as shown in FIG. 3, but these power supply line 26 and connector 27 are not shown in FIG.

  That is, the coupler apparatus 8 includes the coupler apparatus 5 with parasitic elements 81 and 82 and short-circuit elements 83 and 84 added thereto.

  The parasitic elements 81 and 82 are formed by forming a conductive material into a rectangular flat plate shape. The parasitic elements 81 and 82 are adjacent to the coupling element 51 and are disposed at positions separated from the coupling element 51. The parasitic elements 81 and 82 are further arranged in parallel with the coupling element 51 interposed therebetween.

  The short-circuit elements 83 and 84 have a rectangular flat plate shape, and the thickness direction thereof is orthogonal to the thickness direction of the parasitic elements 81 and 82. The short-circuit element 83 is joined to the parasitic element 81. The short-circuit element 83 may be integrated with the parasitic element 81 or may be a separate body. The short-circuit element 84 is joined to the parasitic element 82. The short-circuit element 84 may be integrated with the parasitic element 82 or may be a separate body. The short-circuit elements 83 and 84 are disposed so as to pass through the inside of the dielectric 25 and are electrically connected to the ground plane 24.

  The parasitic elements 81 and 82 are not connected to the transmission / reception circuit 202 and are not fed.

  FIG. 18 shows two projection areas (areas facing the coupling element 51 and the parasitic elements 81 and 82) when the coupling element 51 and the parasitic elements 81 and 82 are projected in the front and back direction on the front side surface of the ground plane 24. Regions AR11, AR12, and AR13 are indicated by chain lines. From FIG. 18, since a part of the area corresponding to the rectangular parts 51a and 51b in the area AR11 overlaps the notched parts 24a and 24b, the notched parts 24a and 24b are opposed to a part of the rectangular parts 51a and 51b. Is provided, that is, the notches 24a and 24b are provided in the vicinity (adjacent regions) of the regions corresponding to the rectangular portions 51a and 51b. Further, since the vicinity of the central portion of the area AR11 does not overlap any of the notches 24a and 24b, it can be seen that the notches 24a and 24b do not face the feeding point P4. Furthermore, since the area | region corresponding to the rectangular parts 51d and 51e in area | region AR11 does not overlap any of the notch parts 24a and 24b, it turns out that the short circuit elements 22 and 23 can contact the ground plane 24. FIG.

  Further, from FIG. 18, since a part of the regions AR12 and AR13 overlaps the notches 24a and 24b, the notches 24a and 24b are provided so as to face a part of the parasitic elements 81 and 82. It can be seen that the notches 24a and 24b are provided in the vicinity (adjacent region) of the region corresponding to the power feeding elements 81 and 82. Note that the notches 24a and 24b in the coupler apparatus 8 have the notches 24a and 24b in the coupler apparatus 2 so that the ground plane 24 has a convex portion extending to a position corresponding to the center of the parasitic elements 81 and 82. Have different shapes. Thereby, the short-circuit elements 83 and 84 can contact the ground plane 24.

  FIG. 18 shows two projection regions (regions facing the coupling element 51 and the parasitic elements 81 and 82) when the coupling element 51 and the parasitic elements 81 and 82 are projected in the front and back direction on the surface side of the dielectric 25. Regions AR21, AR22, and AR23 are indicated by dotted lines. From FIG. 18, since none of the areas AR21, AR22, AR23 overlaps the notches 25a, 25b, the notches 25a, 25b are provided so as not to face all of the coupling element 51 and the parasitic elements 81, 82. You can see that

  With such a configuration, a communication area wider than the communication area obtained by the coupler apparatus 5 can be obtained.

  This embodiment can be variously modified as follows.

  At least one of the cutout portions 24a and 24b may not be provided, and a cutout portion different from the cutout portions 24a and 24b may be formed in the base plate 24. Moreover, the shape and formation position of the notches 24a and 24b can be arbitrarily changed.

  At least one of the cutout portions 25a and 25b may not be provided, and a cutout portion different from the cutout portions 25a and 25b may be formed in the dielectric 25. Moreover, the shape and formation position of the notches 25a and 25b can be arbitrarily changed.

  The coupling element in each of the above embodiments may be changed so as to have a convex portion that is joined to a position that is a feeding point in each of the above embodiments, and the power supply line 26 may be connected to the convex portion.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  2, 3, 4, 5, 6, 7, 8 ... coupler device, 21, 31, 41, 51, 61, 71 ... coupling element, 22, 23, 72, 73 ... short circuit element, 24 ... ground plane, 24a, 24b ... notches, 25 ... dielectrics, 25a, 25b ... notches, 26 ... feed lines, 27 ... connectors, 21a, 21b, 21c, 21d, 31c, 31d, 41c, 41d, 51a, 51b, 51c, 51d, 51e , 61a, 61b, 61c, 71a, 71b, 71c, 71d, 71e, 71f ... rectangular portion, 31a, 31b, 41a, 41b ... L-shaped portion, 61d, 61e ... U-shaped portion, 81, 82 ... parasitic element, 83, 84: Short-circuit elements.

Claims (7)

A coupler device;
A communication device that communicates with other communication devices using electromagnetic coupling between the coupler apparatus and another coupler apparatus;
A communication device comprising a feeder line for connecting the coupler apparatus and the communication device,
The coupler apparatus is
A dielectric having first and second surfaces;
A first conductive portion provided on the first surface and connected to the feeder line at a reference point;
Second and third conductive portions respectively provided at positions sandwiching the first conductive portion with each other on the first surface;
A ground plate provided on the second surface;
A first short-circuit element in contact with the second conductive portion at a first position and short-circuiting the second conductive portion and the ground plane;
A second short-circuit element in contact with the third conductive portion at a second position symmetrical to the first position with the reference point as a center, and short-circuiting the third conductive portion and the ground plane; . A coupler device;
A communication device that communicates with other communication devices using electromagnetic coupling between the coupler apparatus and another coupler apparatus;
A communication device comprising a feeder line for connecting the coupler apparatus and the communication device,
The coupler apparatus is
A first conductive portion to which the feeder line is connected at a reference point;
Second and third conductive portions respectively provided at positions sandwiching the first conductive portion with each other;
A ground plane facing the first to third conductive portions;
A first short-circuit element in contact with the second conductive portion at a first position and short-circuiting the second conductive portion and the ground plane;
A second short-circuit element in contact with the third conductive portion at a second position symmetrical to the first position with the reference point as a center, and short-circuiting the third conductive portion and the ground plane; . A coupler device;
A communication device that communicates with other communication devices using electromagnetic coupling between the coupler apparatus and another coupler apparatus;
A communication device comprising a feeder line for connecting the coupler apparatus and the communication device,
The coupler apparatus is
A first conductive portion that is connected to the power supply line at a reference point, and that generates currents in first and second directions opposite to each other across the reference point by power feeding through the power supply line;
Second and third conductive portions that intersect in the first and second directions and extend in opposite third and fourth directions, respectively;
A ground plane facing the first to third conductive portions;
A first short-circuit element in contact with the second conductive portion at a first position and short-circuiting the second conductive portion and the ground plane;
A second short-circuit element in contact with the third conductive portion at a second position symmetrical to the first position with the reference point as a center, and short-circuiting the third conductive portion and the ground plane; .   The communication device according to claim 2, wherein the coupler device further includes a dielectric positioned between the first, second, and third conductive portions and the ground plane.   The communication device according to any one of claims 1 to 4, wherein the first conductive portion has a symmetric shape with the reference point as a center.   The communication device according to any one of claims 1 to 5, wherein the second conductive portion and the third conductive portion have shapes that are symmetrical to each other about the reference point.   The communication device according to any one of claims 1 to 6, wherein the position of the reference point, the first position, and the second position are arranged on the same straight line.

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