WO2018012290A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
WO2018012290A1
WO2018012290A1 PCT/JP2017/023730 JP2017023730W WO2018012290A1 WO 2018012290 A1 WO2018012290 A1 WO 2018012290A1 JP 2017023730 W JP2017023730 W JP 2017023730W WO 2018012290 A1 WO2018012290 A1 WO 2018012290A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antenna coil
slit
coil
conductor
Prior art date
Application number
PCT/JP2017/023730
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English (en)
Japanese (ja)
Inventor
折原　勝久
Original Assignee
デクセリアルズ株式会社
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Filing date
Publication date
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Publication of WO2018012290A1 publication Critical patent/WO2018012290A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers

Definitions

  • the present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device such as a transmitter via an electromagnetic field signal.
  • an antenna module for RFID Radio Frequency Identification
  • This antenna module performs communication using an inductive coupling with an antenna coil mounted on a transmitter such as a reader / writer. That is, in this antenna module, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert it into electric power and drive an IC that functions as a communication processing unit.
  • the antenna module needs to receive a magnetic flux of a certain value or more from the reader / writer with the antenna coil in order to reliably communicate. Therefore, in the antenna module according to the conventional example, a loop coil is provided in a housing of a mobile phone or the like, and the coil receives a magnetic flux from the reader / writer.
  • the antenna module incorporated in an electronic device such as a cellular phone has a magnetic flux from the reader / writer rebounded due to an eddy current generated when a metal such as a substrate or a battery pack inside the device receives a magnetic field from the reader / writer. End up. For example, when considering the surface of the case of a mobile phone, the magnetic field coming from the reader / writer tends to be strong at the outer peripheral portion of the case surface and weak near the center of the case surface.
  • the loop coil In the case of an antenna using a normal loop coil, the loop coil is located at the central portion of the mobile phone where the opening portion cannot receive the magnetic field passing through the outer peripheral portion of the casing surface described above. For this reason, in the antenna using a normal loop coil, the efficiency which receives a magnetic field has deteriorated.
  • Patent Document 1 discloses a portable device in which an antenna coil that performs communication by receiving an electromagnetic wave with a predetermined frequency radiated from an external antenna is incorporated in a housing, and the electromagnetic wave is transmitted more than the communication surface of the antenna coil. It is described that by providing a metal layer on the incident side, it is possible to suppress communication problems when the external antenna is close to the antenna coil inside the housing.
  • Patent Document 2 includes a looped or spiral coil conductor having a winding center as a coil opening, and a conductor layer disposed closer to the antenna on the communication counterpart side than the coil conductor.
  • the conductor layer includes a conductor opening and a slit portion that connects between the conductor opening and the outer edge, and an antenna device is described in which the coil conductor and the conductor layer overlap when the coil conductor is viewed in plan. Yes.
  • JP 2006-270681 A Japanese Patent No. 4687832
  • Patent Document 1 describes a portable device in which a part of an antenna coil and a metal layer is superimposed, but does not describe a portable device in which the entire antenna coil is superimposed on a metal layer.
  • Patent Document 2 describes an antenna device in which a coil opening and a conductor opening overlap at least partially, but does not describe an embodiment without an opening.
  • the present invention has been proposed in view of such a situation, and provides an antenna device that can operate without providing an opening in a conductor.
  • One embodiment of the present invention is an antenna device that is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and is provided by winding a conductive wire two-dimensionally through the opening.
  • An antenna coil that is inductively coupled to the external device of the antenna coil, and a conductor provided to overlap the antenna coil on a surface facing the antenna coil, and at least a part of the antenna coil overlaps the conductor.
  • a slit is formed.
  • a slit is formed in the conductor so that at least a portion thereof overlaps with the antenna coil, so that a magnetic field generated from the antenna coil can leak from the conductor through the slit. Therefore, an antenna device that can operate without providing an opening in the conductor can be realized.
  • the slit may intersect with at least one side of the antenna coil in plan view.
  • the slit is formed so as to intersect with at least one side of the antenna coil in a plan view, the area where the magnetic field generated from the antenna coil leaks from the conductor increases, so that the communication characteristics are improved.
  • a plurality of slits may be formed.
  • the area where the magnetic field generated from the antenna coil leaks out of the conductor increases, so the communication characteristics are improved.
  • At least two slits among a plurality of formed slits may be orthogonal to each other.
  • the slits intersect the four sides of the antenna coil in plan view, so that the magnetic field distribution in the four directions can be made uniform.
  • At least one end of the slit may be formed over the end portion of the conductor.
  • ⁇ Generation of eddy current can be prevented by forming the slit over the end.
  • the antenna coil may be provided by being wound so that the conductive wires opposed in the width direction through the opening are close to each other.
  • the sides of the antenna coil are close to the slit, so that the communication characteristics are further improved.
  • a slit is formed on a conductor that shields the antenna coil so that at least a part of the conductor overlaps with the antenna coil, so that the antenna device can operate without providing an opening in the conductor. Can be provided.
  • FIG. 1 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied.
  • FIG. 2A is a perspective view showing an example of the inside of an electronic apparatus including the antenna device according to one embodiment of the present invention
  • FIG. 2B is a conductor (metal cover) of the antenna device according to one embodiment of the present invention. It is a perspective view for demonstrating arrangement
  • 3A, 3B, and 3C are plan views for explaining the arrangement of the slits in the antenna device according to the embodiment of the present invention.
  • 4A, 4B, and 4C are plan views for explaining the arrangement of slits in the antenna device according to the embodiment of the present invention.
  • FIG. 5A and 5B are plan views for explaining aspects of the antenna device as a comparative example.
  • 6A and 6B are explanatory diagrams of an evaluation method for confirming the operation / effect of the antenna device according to the embodiment of the present invention
  • FIG. 6A is a perspective view
  • FIG. 6B is a plan view
  • 7A and 7B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the first embodiment.
  • FIG. 7A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 7B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • 8A and 8B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the second embodiment.
  • FIG. 8A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 8B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • 9A and 9B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the third embodiment.
  • FIG. 9A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 9B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • 10A and 10B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna device according to the fourth embodiment.
  • FIG. 10A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 10B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • FIG. 1 is a perspective view illustrating a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied
  • FIG. 2A is an electronic device including the antenna device according to an embodiment of the present invention
  • FIG. 2B is a perspective view for explaining the arrangement of slits and antenna coils formed in a conductor (metal cover) of an antenna device according to an embodiment of the present invention. It is.
  • the antenna device 1 is a device that is incorporated in an electronic device 30 and communicates with an external device via an electromagnetic field signal.
  • the antenna device 1 is incorporated in an RFID wireless communication system 100 as shown in FIG. Used.
  • the wireless communication system 100 includes an antenna device 1 provided in an electronic device 30 and a reader / writer 40 serving as an external device that accesses the antenna device 1.
  • the antenna device 1 and the reader / writer 40 are arranged to face each other on the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
  • the reader / writer 40 functions as a transmitter that transmits a magnetic field in the Z-axis direction to the antenna devices 1 that face each other in the XY plane, and specifically, an antenna 41 that transmits a magnetic field toward the antenna device 1 And a control board 42 that communicates with the antenna device 1 that is inductively coupled via the antenna 41.
  • the reader / writer 40 is provided with a control board 42 electrically connected to the antenna 41.
  • a control circuit 43 made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 42.
  • the control circuit 43 executes various processes based on the data received from the antenna device 1.
  • the control circuit 43 when transmitting data to the antenna device 1, the control circuit 43 encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the data.
  • the modulated signal is amplified, and the antenna 41 is driven by the amplified modulated signal.
  • the control circuit 43 when reading data from the antenna device 1, the control circuit 43 amplifies the modulation signal of the data received by the antenna 41, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
  • the control circuit 43 uses an encoding method and a modulation method used in a general reader / writer. For example, a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • ASK Amplitude Shift Keying
  • the antenna device 1 is incorporated into a housing of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 40 in the XY plane, for example.
  • the antenna device is driven by the antenna module 2 having the antenna substrate 3 on which the antenna coil 12 that can communicate with the reader / writer 40 that is inductively coupled is mounted, and the current that flows through the antenna coil 12.
  • the communication processing unit 13 that communicates with the reader / writer 40, and a conductor made of metal or the like as a housing, for example, are provided.
  • the antenna module 2 is provided inside the housing (conductor) of the electronic device 30 and communicates with the reader / writer 40 that is inductively coupled.
  • the antenna module 2 includes a portable terminal 10 having a conductor 11, an antenna coil 12, a battery pack 15, a printed circuit board 16, and a SIM slot 17. Etc.
  • an antenna coil 12 formed by patterning a flexible conductive wire 12a such as a flexible printed circuit, and the antenna coil 12 and the communication processing unit 13 are electrically connected to the antenna substrate 3.
  • the terminal part 14 to be mounted is mounted.
  • the antenna coil 12 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 40, the antenna coil 12 is magnetically coupled to the reader / writer 40 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 14. It has a function of supplying to the unit 13.
  • the antenna coil 12 has, for example, a substantially rectangular shape as shown in FIG. 2A, and one conductor 12a of the antenna coil 12 is circulated along the outer shape, and the center side is an opening 12b. That is, the antenna coil 12 is provided by winding the conducting wire 12a two-dimensionally through the opening 12b.
  • the antenna coil 12 is arranged so that the main surface around which the conducting wire 12a circulates opposes the reader / writer 40 in the XY plane shown in FIG. 1 during communication.
  • the communication processing unit 13 is driven by the current flowing through the antenna coil 12 and communicates with the reader / writer 40. Specifically, the communication processing unit 13 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory of the communication processing unit 13. The communication processing unit 13 reads the data to be transmitted to the reader / writer 40 from the internal memory, encodes the read data, modulates the carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The radio wave modulated through the coil 12 is transmitted to the reader / writer 40. Note that the communication processing unit 13 may be driven not by power flowing through the antenna coil 12 but by power supplied from a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • the conductor 11 is provided as, for example, a metal cover serving as a casing of the electronic device 30 and serves as a first conductor facing the reader / writer 40 serving as an external device.
  • the conductor is provided in a housing of an electronic device such as a mobile phone, a smartphone, or a tablet PC, and is opposed to the reader / writer 40 during communication of the antenna module 2.
  • Some of them constitute a conductor.
  • the conductor is provided on the metal cover attached to the inner surface of the smartphone casing, the metal casing of the battery pack housed in the smartphone, or the back surface of the liquid crystal module of the tablet PC. Used in metal plates.
  • the conductor 11 conducts electricity relatively well, when an AC magnetic field is applied from the outside, an eddy current is generated and the magnetic field is rebounded.
  • the second conductor such as the battery pack 15 provided inside the housing, there is a prior art that improves communication characteristics by disposing an antenna device at the end of the second conductor.
  • the antenna device 1 is provided by winding a conductive wire two-dimensionally through an opening 12b as shown in FIG. )
  • the antenna coil 12 is inductively coupled to the antenna 40, and the conductor 11 is provided on the surface of the antenna coil 12 facing the external device 40 so as to overlap the antenna coil 12.
  • the conductor 11 includes the antenna coil 12 A slit 18 is formed so that at least a part thereof overlaps.
  • the conductor 18 that shields the antenna coil 12 is formed with the slit 18 so that at least a part thereof overlaps with the antenna coil 12, so that the magnetic field generated from the antenna coil 12 through the slit 18 is transmitted to the conductor. Therefore, it is possible to realize the antenna device 10 that can operate without providing an opening in the conductor 11.
  • the conductor 11 is, for example, a metal cover of a mobile terminal. In the case of a metal, the kind is not specifically limited.
  • the conductor 11 is provided so as to overlap the antenna coil 12 on the facing surface of the antenna coil 12 and the external device 40.
  • the slit 18 is formed on the conductor 11 so that at least a part thereof overlaps with the antenna coil 12. As long as the slit 18 penetrates the conductor 11, the magnetic field can leak from the slit 11. Therefore, the slit 18 may be very narrow and is not particularly limited. If the slit 18 is at least partially overlapped with the antenna coil 12, the magnetic field generated from the antenna coil 12 leaks through the slit 18, thereby enabling communication with the external device (reader / writer) 40.
  • the formation mode of the slit 18 will be described with some embodiments.
  • FIG. 3A, FIG. 3B and FIG. 3C, FIG. 4A, FIG. 4B and FIG. 4C are plan views for explaining the arrangement of slits in the antenna device according to one embodiment of the present invention.
  • the antenna coil 52 is divided into an upper side 52a, a lower side 52b, a left side 52c, a right side 52d, and an opening 52h.
  • the slit 58 may be formed so as to intersect with at least one side (the right side 52d in FIG. 3A) of the antenna coil 52 in plan view. it can.
  • the slit 58 By forming the slit 58 so as to cross at least one side of the antenna coil 52, the area where the magnetic field generated from the antenna coil 52 leaks from the conductor through the slit 58 is increased, so that the communication characteristics are improved.
  • it is preferable that one end of the slit 58 is formed to the center of the opening 52 h of the antenna coil 52.
  • the slit 58 is formed so as to intersect the right side 52d of the antenna coil 52 in plan view, but is formed so as to intersect any of the upper side 52a, the lower side 52b, the left side 52c, and the right side 52d. May be.
  • a plurality of slits 58 may be formed on the conductor 51. By forming a plurality of slits 58, the area where the magnetic field generated from the antenna coil 52 leaks from the conductor is increased, so that the communication characteristics are improved.
  • a plurality of slits 58 may be formed on one side of the antenna coil 52, or may be formed dispersedly on any of the upper side 52a, the lower side 52b, the left side 52c, and the right side 52d. Alternatively, the slit 58 may be formed so as to obliquely intersect one side of the antenna coil 52 in plan view.
  • the slit 68 is formed so as to intersect with two sides of the antenna coil 62 (left side 62c and right side 62d in FIG. 3B) in plan view. can do.
  • the slit 68 intersects two sides of the antenna coil 62 (left side 62c and right side 62d in FIG. 3B) in plan view, the magnetic field leaks from the left side 62c side and the right side 62d side of the antenna coil 62 through the slit 68.
  • the leakage magnetic field distribution can be symmetric.
  • the slit 68 is preferably formed so that one slit 68 crosses the left side 62c and the right side 62d of the antenna coil 62 as shown in FIG. 3B. You may form so that the left side 62c and the right side 62d may be crossed.
  • two slits (for convenience, the first slit 78 and the second slit 79 in FIG. 3C are used). .) Can intersect with the four sides of the antenna coil 72 in plan view. That is, the first slit 78 is formed so as to cross the left side 72c and the right side 72d of the antenna coil 72, and the second slit 79 is formed so as to cut the upper side 72a and the lower side 72b of the antenna coil 72 vertically.
  • the first slit 78 and the second slit 79 are preferably orthogonal and form a substantially cross shape, but are not necessarily limited to this mode.
  • one end of the slit 118 that intersects at least one side (the right side 112d in FIG. 4A) of the antenna coil 112 in plan view is a conductor 111. It can be made to be formed over the end portion. By forming the slit 118 over the end portion of the conductor 111, the loop of the eddy current flowing through the conductor 111 during communication can be interrupted to prevent the generation of eddy current, and the loss of magnetic flux passing therethrough is suppressed. be able to.
  • the slit 128 crosses two sides of the antenna coil 122 (the left side 122c and the right side 122d in FIG. 4B), and both ends of the slit 128 are The end of the conductor 121 may be reached. Also in this case, the slit 128 can block the eddy current loop flowing in the conductor 121 during communication, prevent the eddy current from being generated, and suppress the loss of the passing magnetic flux.
  • positioning of the slit formed until now was demonstrated, when the slit is already formed in the electronic device 30, you may make it arrange
  • the antenna coil 122 may be arranged so as to correspond to a slit-like gap formed in the hinge portion of the mobile terminal 10.
  • the shape of the antenna coil is not limited to a substantially square or substantially rectangular shape, for example, a polygon such as a hexagon, an octagon, a circle, an ellipse, or an inner shape. May be a curved antenna coil.
  • the antenna coil 132 is provided by being wound so that the conductive wires facing in the width direction are close to each other through the opening 132h. That is, it is preferable that the antenna coil 132 has a substantially strip shape that is elongated in the longitudinal direction.
  • the slit 138 is formed in the same manner as the slits in the antenna devices 50, 60, 70, 110, and 120 described above.
  • the slit 138 has a substantially strip-shaped antenna.
  • the coil 132 is preferably formed so as to cross the short side (the left side 132c and the right side 132d in FIG. 4C).
  • space saving can be realized by using the antenna coil 132 having a substantially strip shape.
  • a magnetic sheet may be provided on the side of the antenna coil 12 opposite to the surface facing the reader / writer 40 so as to overlap the antenna coil 12.
  • the magnetic sheet is formed of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite, and in order to improve the communication characteristics of the antenna device 1, the magnetic flux sent from the reader / writer 40 during communication of the antenna device 1 is transmitted to the antenna coil 12. Has a function of guiding toward the center side.
  • the antenna device As described above, in the antenna device according to an embodiment of the present invention, sufficient communication characteristics can be obtained without providing an opening in the conductor, which is excellent from the viewpoint of strength and design. Antenna device.
  • Examples 1 to 4 and Comparative Examples 1 and 2 are used for the operation and effect when slits of several forms are formed on a conductor overlapping with an antenna coil in an antenna device according to an embodiment of the present invention. And verified.
  • Example 1 In Example 1, a coil of 4 turns with an outer diameter of 20 mm ⁇ 20 mm and a pitch of 1.0 mm was disposed under an aluminum plate having an outer diameter of 100 mm ⁇ 100 mm and a thickness of 0.3 mm with a gap of 0.05 mm. A ferrite sheet (magnetic sheet) having the same size as the outer shape of the antenna coil and a thickness of 0.1 mm was attached under the antenna coil. The aluminum plate was provided with a slit (30 mm ⁇ 0.5 mm) crossing one side of the antenna coil (see FIG. 3A).
  • Example 2 In Example 2, the same antenna device as in Example 1 was used except that a slit (50 mm ⁇ 0.5 mm) across two sides of the antenna coil was provided on the aluminum plate (see FIG. 3B).
  • Example 3 an antenna device similar to that of Example 1 except that two slits (each 50 mm ⁇ 0.5 mm) crossing the four sides of the antenna coil are provided in a cross shape on the aluminum plate (see FIG. 3C). Was used.
  • Example 4 In Example 4, a coil of 4 turns with an outer diameter of 40 mm ⁇ 10 mm and a pitch of 1.0 mm was used, and a slit (50 mm ⁇ 0.5 mm) crossing two short sides of the antenna coil was provided on the aluminum plate (see FIG. 4C). Except for this, the same antenna device as in Example 1 was used.
  • Comparative Example 1 In Comparative Example 1, an antenna device 200 similar to that in Example 1 was used except that an opening 203 of 10 mm ⁇ 10 mm was provided in a portion overlapping the inside of the antenna coil 202 of the aluminum plate 201 (see FIG. 5A). .
  • Comparative Example 2 In Comparative Example 2, an example in which an opening 213 of 20 mm ⁇ 20 mm, which is substantially the same as the outer shape of the antenna coil 212, is provided in a portion overlapping the outside of the antenna coil 212 of the aluminum plate 211 (see FIG. 5B). 1 was used.
  • FIGS. 6A and 6B are explanatory diagrams of an evaluation method for confirming the operation and effect of the antenna device according to the embodiment of the present invention
  • FIG. 6A is a perspective view
  • FIG. 6B is a plan view. is there.
  • the coupling coefficient k when the opposing reader / writer was moved in a predetermined direction was obtained by simulation.
  • the reader / writer antenna 301 is a two-turn coil 321a having an outer diameter defined in the xy-axis direction of 70 mm.
  • the reader / writer antenna 301 is opposed to the antenna devices of Examples 1 to 4 and Comparative Examples 1 and 2, and the reader / writer antenna 301 is placed in the x-axis direction (downward direction in FIG. 6B) and y as shown in FIG. 6B.
  • Communication characteristics (coupling coefficient k) when the relative positional relationship between the antenna 312 of the antenna device and the antenna coil 321a on the reader / writer side was changed by moving in the axial direction (right direction in FIG. 6B) were evaluated.
  • the distance between the reader / writer antenna coil 321a and the antenna coil 312 of the antenna device defined in the z-axis direction was 20 mm.
  • FIG. 7A and 7B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the first embodiment.
  • FIG. 7A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 7B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • Comparative Example 1 when the opening of the aluminum plate was smaller than the inner diameter of the antenna coil, the magnetic flux hardly leaked through the opening of the aluminum plate, so the coupling coefficient k was a value close to zero. Further, when the opening of the aluminum plate is the same as the outer shape of the antenna coil as in Comparative Example 2, the magnetic flux can leak through the opening of the aluminum plate, and the coupling coefficient k is between 0.003 and 0.007.
  • Example 1 it was found that the communication characteristics exceeding Comparative Example 2 were obtained by providing a slit across one side of the antenna coil on the aluminum plate. In Example 1, since the slit is formed so as to cross one side of the antenna coil, the center of the distribution of the coupling coefficient k is shifted.
  • FIG. 8A and 8B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the second embodiment.
  • FIG. 8A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 8B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • communication characteristics exceeding Comparative Example 2 were obtained by providing a slit across the two sides of the antenna coil on the aluminum plate.
  • Example 2 it turned out that the distribution of the coupling coefficient k is symmetric compared to Example 1 because the slit crosses two sides of the antenna coil.
  • FIG. 9A and 9B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna apparatus according to the third embodiment.
  • FIG. 9A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 9B is a graph when the reader / writer antenna is moved in the y-axis direction.
  • the antenna device according to Example 3 it was found that communication characteristics exceeding Comparative Example 2 were obtained by providing a slit across the four sides of the antenna coil on the aluminum plate. Further, in Example 3, the distribution of the coupling coefficient k is symmetric with respect to any displacement in the x-axis and y-axis directions as compared with Example 1 and Example 2 because the slit crosses four sides of the antenna coil. I found out that
  • FIG. 10A and 10B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna device according to the fourth embodiment.
  • FIG. 10A shows a case where the reader / writer antenna is moved in the x-axis direction.
  • FIG. 10B is a graph when the reader / writer antenna is moved in the y-axis direction. It was found that by using a substantially strip-shaped antenna coil as in the antenna device according to Example 4, the communication characteristics were superior to those of Example 2 in which a slit was formed in a square antenna coil.
  • the antenna device according to the embodiment of the present invention does not need to have an opening in the conductor, so that it is excellent in strength and has excellent communication characteristics with less restrictions in terms of design. It can be set as the antenna device which has.
  • Antenna device 1, 50, 60, 70, 110, 120, 130, 200, 210 Antenna device, 2 Antenna module, 3 Antenna substrate, 10 Mobile terminal, 11, 51, 61, 71, 111, 121, 131, 201, 211 Conduction Body, 12, 52, 62, 72, 112, 122, 132, 202, 212 antenna coil, 12a conductor, 12b opening, 13 communication processing unit, 14 terminal unit, 15 battery pack, 16 printed circuit board, 17 SIM slot, 18, 58, 68, 78, 79, 118, 128, 138 slit, 30 electronic device, 40 external device (reader / writer), 41 antenna, 42 control board, 43 control circuit, 52a, 62a, 72a, 112a, 122a, 132a, upper side, 52b, 62b, 72b, 112b, 22b, 132b lower side, 52c, 62c, 72c, 112c, 122c, 132c left side, 52d, 62

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

L'invention concerne un dispositif d'antenne capable de fonctionner sans fournir une ouverture dans un corps électro-conducteur. Ce dispositif d'antenne 1 est intégré dans un instrument électronique 30 et communique avec un instrument externe 40 au moyen d'un signal électromagnétique, le dispositif d'antenne comprend : une bobine d'antenne 12 qui est obtenue par enroulement d'un fil conducteur sous une forme bidimensionnelle autour d'une ouverture 12b, et qui est couplé de manière inductive à l'instrument externe (dispositif de lecture/écriture) 40; et un corps électro-conducteur 11 qui est disposé sur une surface opposée de la bobine d'antenne 12 opposée à l'instrument externe 40 de façon à être superposé sur la bobine d'antenne 12. Le corps électro-conducteur 11 présente une fente 18 formée de telle sorte qu'au moins une partie de celle-ci soit superposée à la bobine d'antenne 12.
PCT/JP2017/023730 2016-07-11 2017-06-28 Dispositif d'antenne WO2018012290A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-136760 2016-07-11
JP2016136760A JP2018011111A (ja) 2016-07-11 2016-07-11 アンテナ装置

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JP2008131115A (ja) * 2006-11-17 2008-06-05 Tamura Seisakusho Co Ltd アンテナコイル及び通信機器
JP2013038821A (ja) * 2009-11-20 2013-02-21 Murata Mfg Co Ltd アンテナ装置及び移動体通信端末
JP2014011533A (ja) * 2012-06-28 2014-01-20 Nec Tokin Corp アンテナ装置
JP2014206891A (ja) * 2013-04-15 2014-10-30 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 放熱構造
JP5696810B2 (ja) * 2012-09-26 2015-04-08 株式会社村田製作所 アンテナ装置およびアンテナ装置を備えた電子機器
JP2015144366A (ja) * 2014-01-31 2015-08-06 Tdk株式会社 アンテナ装置及びこれを用いた携帯電子機器
WO2015115402A1 (fr) * 2014-01-30 2015-08-06 株式会社村田製作所 Appareil de communication sans fil
JP2016111455A (ja) * 2014-12-04 2016-06-20 Tdk株式会社 アンテナ装置及びこれを用いた携帯電子機器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008131115A (ja) * 2006-11-17 2008-06-05 Tamura Seisakusho Co Ltd アンテナコイル及び通信機器
JP2013038821A (ja) * 2009-11-20 2013-02-21 Murata Mfg Co Ltd アンテナ装置及び移動体通信端末
JP2014011533A (ja) * 2012-06-28 2014-01-20 Nec Tokin Corp アンテナ装置
JP5696810B2 (ja) * 2012-09-26 2015-04-08 株式会社村田製作所 アンテナ装置およびアンテナ装置を備えた電子機器
JP2014206891A (ja) * 2013-04-15 2014-10-30 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 放熱構造
WO2015115402A1 (fr) * 2014-01-30 2015-08-06 株式会社村田製作所 Appareil de communication sans fil
JP2015144366A (ja) * 2014-01-31 2015-08-06 Tdk株式会社 アンテナ装置及びこれを用いた携帯電子機器
JP2016111455A (ja) * 2014-12-04 2016-06-20 Tdk株式会社 アンテナ装置及びこれを用いた携帯電子機器

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