WO2015146298A1 - Équipement d'antenne, dispositif électronique, et procédé de réglage d'inductance de matériel d'antenne - Google Patents

Équipement d'antenne, dispositif électronique, et procédé de réglage d'inductance de matériel d'antenne Download PDF

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Publication number
WO2015146298A1
WO2015146298A1 PCT/JP2015/053080 JP2015053080W WO2015146298A1 WO 2015146298 A1 WO2015146298 A1 WO 2015146298A1 JP 2015053080 W JP2015053080 W JP 2015053080W WO 2015146298 A1 WO2015146298 A1 WO 2015146298A1
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WIPO (PCT)
Prior art keywords
antenna
loop antenna
inductance
loop
size
Prior art date
Application number
PCT/JP2015/053080
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English (en)
Japanese (ja)
Inventor
折原　勝久
雅裕 幸保
憲男 斉藤
Original Assignee
デクセリアルズ株式会社
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Priority claimed from JP2014069502A external-priority patent/JP2015192385A/ja
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 WO2015146298A1 publication Critical patent/WO2015146298A1/fr

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    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • 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
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

Definitions

  • the present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, an electronic device in which the antenna device is incorporated, and an inductance adjustment method for the antenna device.
  • antenna modules for RFID have been used in order to incorporate a near field contactless communication (NFC) function.
  • 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 the antenna device, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert the power into electric power and drive the IC functioning 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 device according to the conventional example, a loop coil is provided in the casing of the mobile phone, and the coil receives the 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 a mobile phone case, 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. Therefore, an antenna device in which a loop antenna is arranged on the outer peripheral portion of the surface of the casing where the magnetic field coming from the reader / writer is strong, and an antenna device in which the magnetic sheet is used to increase the magnetic flux to improve the performance have been proposed. . In these antenna devices, the loop antenna has a rectangular shape and is installed so that its long side is along the outer peripheral edge of the housing surface (see, for example, Patent Documents 1 to 3).
  • a resonance capacitor is connected to the loop antenna to perform non-contact communication and power transmission between the reader / writer and the non-contact data carrier.
  • Patent Document 4 discloses an RFID tag that can adjust the resonance frequency of an RFID antenna having a built-in resonance circuit after being installed in an electronic device.
  • a magnetic material is attached so as to overlap with the antenna coil, or a conductor is attached inside the antenna coil, and the inductance is adjusted so that a desired resonance frequency is obtained.
  • a large antenna is used so as to enable good communication with a large reader / writer (R / W) installed in an automatic ticket gate of a station. Size is required. For this reason, smartphones often use large antennas having a coil width that is substantially the same as the width of the housing.
  • the present invention has been made in view of the above-described problems, and is a novel and capable of improving the communication characteristics of NFC in order to achieve both the communication performance with a large reader / writer and a small IC tag.
  • An object is to provide an improved antenna device and electronic apparatus.
  • the present invention has been made in view of the above problems, and is a new and improved antenna that can easily adjust its inductance even after installing a substantially strip-shaped loop antenna elongated in the longitudinal direction in an electronic device.
  • An object of the present invention is to provide a device and an inductance adjustment method for an antenna device.
  • One embodiment of the present invention is an antenna device which is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and both edge portions thereof are at least from both edge portions in the width direction of the casing of the electronic device.
  • a loop antenna having a width of a predetermined distance and around which an antenna coil that is inductively coupled with the external device circulates, and is formed of a magnetic material, and is opposite to the surface facing the external device of the loop antenna.
  • a magnetic sheet configured to expand from both edge portions in the width direction of the loop antenna toward both edge portions in the width direction of the housing.
  • communication performance with an external device such as a large reader / writer is improved by a magnetic sheet that extends to both edges in the width direction of the casing of the electronic device, and both edges are electronic.
  • Communication performance with a small IC tag is ensured by a small loop antenna having a width having a predetermined distance from both edges of the housing of the device. Therefore, good communication characteristics can be obtained regardless of the size of the antenna of the opposing external device.
  • a first conductor facing the external device is provided inside the casing of the electronic device, and the size of the loop antenna in the width direction is the width direction of the first conductor.
  • the magnetic sheet may be configured to expand at least from both edge portions of the loop antenna to both edge portions in the width direction of the first conductor.
  • the magnetic sheet that extends to both edges in the width direction of the first conductor improves the communication performance with an external device such as a large reader / writer, and the loop antenna allows a small IC tag and Communication performance is ensured. Therefore, good communication characteristics can be obtained regardless of the size of the antenna of the opposing external device.
  • the magnetic sheet may be configured to be developed in the longitudinal direction of the loop antenna, including the insides of both edges of the loop antenna.
  • the magnetic sheet is configured to expand from one of both edges in the width direction of the loop antenna to one of both edges in the width direction of the first conductor. And a second magnetic sheet that extends from the other of the two edges in the width direction of the loop antenna to the other of the two edges in the width direction of the first conductor. It is good also as a structure provided with a magnetic sheet.
  • the first magnetic sheet and the second magnetic sheet improve communication performance with an external device such as a large reader / writer, and the loop antenna ensures communication performance with a small IC tag.
  • a hole having a predetermined size may be formed in any part of the magnetic sheet facing the opening on the center side of the loop antenna.
  • magnetic flux from an external device such as an IC tag can be collected and guided to the center side of the loop antenna by the magnetic sheet in which the hole is formed.
  • Another aspect of the present invention is an electronic device in which any of the antenna devices described above is incorporated and can communicate with an external device via an electromagnetic field signal.
  • the communication characteristics can be enhanced by utilizing the magnetic shield effect of the main metal plate of the electronic device regardless of the size of the antenna of the external device.
  • Another aspect 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 a substantially strip-shaped loop around which an antenna coil that is inductively coupled with the external device circulates.
  • Any surface of the loop antenna, a magnetic sheet formed of an antenna and a magnetic body, and affixed on the opposite side of the surface facing the external device of the loop antenna or penetrating the opening of the loop antenna Inductance adjustment that is bridged over both edges in the width direction of the loop antenna so as to cover the vicinity of the center of the opening formed inside the loop antenna, and that can adjust the magnitude of the inductance of the loop antenna A member.
  • an antenna device including a substantially strip-shaped loop antenna by bridging an inductance adjusting member in the vicinity of the center portion of the loop antenna and bridging both ends in the width direction of the loop antenna.
  • the inductance can be easily controlled in a state where it is mounted on an electronic device.
  • the inductance adjusting member may be capable of adjusting the size of the inductance by adjusting the size of the loop antenna in the longitudinal direction.
  • the inductance adjusting member is made of a magnetic material, and the size of the inductance can be increased by increasing the size of the loop antenna in the longitudinal direction. Also good.
  • the inductance can be increased to a desired size by increasing the size of the inductance adjusting member in the longitudinal direction of the loop antenna.
  • the inductance adjusting member may be formed of a good conductor, and the size of the inductance may be reduced by increasing the size of the loop antenna in the longitudinal direction. Good.
  • the inductance can be reduced to a desired size by increasing the longitudinal size of the inductance adjusting member in the loop antenna.
  • Another aspect of the present invention is an antenna device inductance adjustment method for adjusting an inductance of a loop antenna provided in an antenna device that communicates with an external device via an electromagnetic field signal, wherein the loop antenna has a substantially strip shape.
  • the width of the loop antenna is placed on any surface of the loop antenna so that an inductance adjusting member capable of adjusting the inductance of the loop antenna covers the vicinity of the center of the opening formed inside the loop antenna.
  • an antenna device having a substantially strip-shaped loop antenna is provided by bridging an inductance adjusting member in the vicinity of the center portion of the loop antenna so as to bridge both edges in the width direction of the loop antenna. Inductance can be easily controlled while mounted on an electronic device.
  • the inductance adjustment member in the adjustment member installation step, is formed of a magnetic material and is bridged across both edges in the width direction of the loop antenna, and the inductance adjustment step Then, it is good also as increasing the magnitude
  • the inductance can be increased to a desired size by increasing the size of the inductance adjusting member in the longitudinal direction of the loop antenna.
  • the inductance adjustment member formed from a good conductor is bridged across the both edge portions of the loop antenna, and in the inductance adjustment step, the inductance is adjusted.
  • the size of the inductance may be decreased by increasing the size of the adjustment member in the longitudinal direction of the loop antenna.
  • the inductance can be reduced to a desired size by increasing the longitudinal size of the inductance adjusting member in the loop antenna.
  • the performance of an NFC antenna built into an electronic device such as a mobile phone with respect to a small tag is greatly improved, and good communication characteristics that are not affected by the size of an opposing antenna are obtained. can get. Therefore, the NFC communication characteristics are enhanced by achieving compatibility with both the large reader / writer and the small IC tag.
  • the inductance can be easily adjusted even after a substantially strip-shaped loop antenna elongated in the longitudinal direction is installed in an electronic device. For this reason, since the optimum relationship between the inductance of the antenna device and the matching circuit can be maintained, good communication characteristics can be obtained even when the same antenna device is mounted on different electronic devices.
  • 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 illustrating an example of an electronic apparatus including the antenna device according to the embodiment of the present invention
  • FIG. 2B is a plan view of the antenna device according to the embodiment of the present invention.
  • 3A and 3B are plan views of modifications of the antenna device according to the embodiment of the present invention.
  • 4A and 4B are plan views of other modifications of the antenna device according to the embodiment of the present invention.
  • FIG. 5 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to another embodiment of the present invention is applied.
  • FIG. 5 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to another embodiment of the present invention is applied.
  • FIG. 6 is a diagram illustrating a schematic configuration of a circuit of a wireless communication system to which an antenna device according to another embodiment of the present invention is applied.
  • 7A and 7B are explanatory views showing an example of an electronic apparatus including an antenna device according to another embodiment of the present invention, FIG. 7A is a perspective view, and FIG. 7B is a plan view.
  • 8A and 8B are perspective views showing a schematic configuration of an antenna device according to another embodiment of the present invention.
  • FIG. 9 is a plan view showing an example of an antenna device as a comparative example.
  • 10A and 10B 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. 10A is a perspective view, and FIG. 10B is a plan view.
  • FIG. 11A and FIG. 11B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna device according to the embodiment of the present invention.
  • FIG. 11A shows the movement of each antenna device in the X-axis direction.
  • FIG. 11B shows the evaluation result of the communication performance when each antenna device is moved in the Y-axis direction.
  • 12A and 12B are explanatory views of an evaluation method for confirming other functions and effects of the antenna device according to the embodiment of the present invention, FIG. 12A is a perspective view, and FIG. 12B is a plan view.
  • FIG. 13A and 13B are graphs showing evaluation results of communication performance for confirming other functions and effects of the antenna device according to the embodiment of the present invention.
  • FIG. 11A shows the movement of each antenna device in the X-axis direction.
  • FIG. 11B shows the evaluation result of the communication performance when each antenna device is moved in the Y-axis direction.
  • 12A and 12B are explanatory views of an evaluation method for confirming other
  • FIG. 13A shows each antenna device in the X-axis direction.
  • FIG. 13B shows the evaluation result of the communication performance when each antenna apparatus is moved in the Y-axis direction.
  • FIG. 14 is a perspective view showing a schematic configuration of a normal rectangular antenna device as a comparative example of the antenna device according to another embodiment of the present invention.
  • 15A and 15B are diagrams showing the magnetic field strength of the antenna device shown in FIG.
  • FIG. 16 is a perspective view showing a schematic configuration of an example of an antenna apparatus according to another embodiment of the present invention.
  • 17A and 17B are diagrams showing the magnetic field strength of the antenna device shown in FIG. 18A and 18B are perspective views showing a schematic configuration of an antenna apparatus which is a modification of the example of the antenna apparatus according to another embodiment of the present invention.
  • FIGS. 18A and 18B are diagrams showing the magnetic field strength of the antenna device shown in FIGS. 18A and 18B.
  • 20A and 20B are explanatory views of an embodiment of changing the width of the inductance adjusting member
  • FIG. 20A is an explanatory view of changing the width of the inductance adjusting member made of a magnetic material
  • FIG. 20B is an inductance made of a good conductor. Explanatory drawing of the width change of an adjustment member is shown.
  • FIG. 21 is a graph showing the results of an example of changing the width of the inductance adjusting member.
  • FIG. 22A and FIG. 22B are explanatory views of an embodiment of changing the position of an inductance adjusting member made of a magnetic material.
  • FIG. 23A and FIG. 23B are explanatory diagrams of an embodiment of changing the position of an inductance adjusting member made of a good conductor.
  • FIG. 24 is a graph showing the results of an example of changing the position of the inductance adjusting
  • 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 illustrating an example
  • FIG. 2B is a plan view of the antenna device according to the embodiment of the present invention.
  • 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 the electronic device 30 and a reader / writer 120 serving as an external device that accesses the antenna device 1.
  • the antenna device 1 and the reader / writer 120 are arranged to face each other in the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
  • the reader / writer 120 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.
  • the reader / writer 120 includes an antenna 121 that transmits a magnetic field toward the antenna device 1.
  • a control board 122 that communicates with the antenna device 1 that is inductively coupled via the antenna 121.
  • the reader / writer 120 is provided with a control board 122 electrically connected to the antenna 121.
  • a control circuit made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 122.
  • the control circuit executes various processes based on the data received from the antenna device 1.
  • the control circuit when transmitting data to the antenna device 1, the control circuit encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the modulation.
  • the signal is amplified, and the antenna 121 is driven by the amplified modulation signal.
  • the control circuit When reading data from the antenna device 1, the control circuit amplifies the modulation signal of the data received by the antenna 121, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
  • a coding system and a modulation system used in a general reader / writer are used.
  • a Manchester coding system or an ASK (Amplitude Shift Keying) modulation system is used.
  • ASK Amplitude Shift Keying
  • the antenna device 1 is incorporated in a housing of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 120 in the XY plane during communication, and communicates with an external device via an electromagnetic field signal.
  • the antenna device 1 of the present embodiment includes an antenna module 2, a metal plate 3, and a magnetic sheet 20 (see FIGS. 2A and 2B).
  • the antenna module 2 is provided inside the housing 32 (see FIG. 2A) of the electronic device 30 and communicates with the reader / writer 120 that is inductively coupled.
  • the antenna module 2 includes a loop antenna 11, a communication processing unit 13, and a connection unit 14.
  • the loop antenna 11 is provided inside the housing 32 of the electronic device 30 and has an antenna coil 12 (see FIG. 2A) that can communicate with the reader / writer 120 by being inductively coupled to the reader / writer 120 serving as an external device. Go around.
  • the loop antenna 11 is provided on the inner side of the reader / writer 120 with a predetermined distance from the outer edge 3 a of the metal plate 3.
  • the loop antenna 11 is a small antenna having a width that allows both edge portions 11 a to have a size with a predetermined distance from both edge portions 32 a of the housing 32 of the electronic device 30.
  • an antenna coil 12 formed by patterning a flexible conductive wire such as a flexible flat cable, and the antenna coil 12 and the communication processing unit 13 are electrically connected to the loop antenna 11.
  • a terminal portion 14 is mounted.
  • the loop antenna 11 has a substantially rectangular shape as shown in FIG. 2A, and one conductor wire of the antenna coil 12 is circulated along the outer shape, and the center side is an opening 12a.
  • the loop antenna 11 is arranged such that the main surface around which the antenna coil 12 circulates faces the reader / writer 120 in the XY plane shown in FIG. 1 during communication.
  • the loop antenna 11 is configured such that the size in the width direction is smaller than the size in the width direction of the metal plate 3, and inductive coupling with the reader / writer 120 serving as an external device.
  • the antenna coil 12 to be rotated is circulating. That is, the size of the loop antenna 11 in the width direction (Y direction shown in FIG. 2A) is made smaller than the width of the metal plate 3, and both the edge portions 11a of the loop antenna 11 are respectively connected to the both edge portions 3a of the metal plate 3. It is configured to have a predetermined distance.
  • the loop antenna 11 has both edge portions 11a as a predetermined distance from both edge portions 32a of the housing 32 of the electronic device 30, for example, as shown in FIGS.
  • the antenna has a width that is a size that is configured to have a distance of about 1/3 of the distance. That is, in this embodiment, the width of the loop antenna 11 is about 1 / of the width of the casing 32, in other words, the width of the metal plate 3, and the loop antenna 11 is connected to the casing 32 (metal plate 3). ) In the width direction.
  • the loop antenna 11 is small in size so as to be about 1/3 of the width of the metal plate 3 in the housing 32, and therefore communicates via an electromagnetic field signal. Good communication characteristics can be obtained for a small antenna such as a small IC tag.
  • the loop antenna 11 has a substantially rectangular shape.
  • the shape of the loop antenna 11 may be other shapes such as an ellipse as long as the antenna coil 12 circulates.
  • the antenna coil 12 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 120, the antenna coil 12 is magnetically coupled to the reader / writer 120 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing on the received signal via the terminal unit 14. To the unit 13.
  • the communication processing unit 13 is driven by a current flowing through the antenna coil 12 and communicates with the reader / writer 120. 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 120 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 via the coil 12 is transmitted to the reader / writer 120.
  • 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.
  • the metal plate 3 is provided in the housing 32 of the electronic device 30 and serves as a first conductor facing the reader / writer 120 serving as an external device.
  • the metal plate 3 is provided in a housing of an electronic device such as a mobile phone, a smartphone, or a tablet PC, for example, and constitutes a first conductor that faces the reader / writer 120 during communication of the antenna module 2.
  • a metal cover affixed to the inner surface of the smartphone casing, a metal casing of a battery pack stored in the smartphone, or the back surface of the liquid crystal module of the tablet PC Corresponds to a metal plate or the like.
  • the magnetic sheet 20 is formed of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite.
  • a magnetic flux sent from the reader / writer 120 during communication of the antenna module 2 is used as a loop antenna.
  • 11 has a function of guiding toward the center side.
  • the magnetic sheet 20 is provided on the opposite side of the surface facing the reader / writer 120 as shown in FIG. 2A, and extends in the longitudinal direction (X direction) of the loop antenna 11 as shown in FIG. 2B.
  • the metal plate 3 is provided so as to expand in the width direction (X direction). That is, the magnetic sheet 20 is configured to be developed in the longitudinal direction (X direction) of the loop antenna 11 including the inside of both edge portions 11 a of the loop antenna 11.
  • the magnetic sheet 20 is configured to be deployed on the outer and inner sides of both edge portions 11a of the loop antenna 11. For this reason, for the reader / writer 120 having a large antenna, the magnetic flux from the reader / writer 120 is collected on the center side of the loop antenna 11 by the portion of the magnetic sheet 20 that is developed outside the loop antenna 11. Can be guided. On the other hand, for an IC tag or the like having a small antenna, the magnetic flux from the IC tag can be collected and guided to the center side of the loop antenna 11 by the portion of the magnetic sheet 20 that is developed inside the loop antenna 11.
  • the communication characteristics can be further improved.
  • the NFC communication characteristics can be enhanced by using the magnetic shield effect of the main metal plate 3 of the electronic device 30 without being influenced by the size of the antenna of the external device 120.
  • the magnetic sheet 20 is entirely provided below the loop antenna 11 including the inside of the opening 12a of the loop antenna 11. For this reason, regardless of the size of the IC tag, the communication performance of both the large reader / writer and the small IC tag can be compatible, and the NFC communication characteristics can be improved.
  • the magnetic sheet 20 is configured to be deployed on the outer side and the inner side of the both edge portions 11a of the loop antenna 11, but the antenna device 1 has other configurations. It is also possible to do. That is, in the antenna device 1 according to the present embodiment, the magnetic sheet 20 is provided on the opposite side of the surface facing the external device 120 of the loop antenna 11, and at least the both edges 11 a in the width direction of the loop antenna 11. What is necessary is just to become the structure expand
  • the magnetic sheet 20 only needs to be configured to expand from both edge portions 11 a in the width direction of the loop antenna 11 to both edge portions 3 a in the width direction of the metal plate 3.
  • the present invention can also be applied to the following modification examples.
  • the first magnetic sheet 21a and the second magnetic sheet 21b are respectively connected to both the metal plates 3 from both edges 11a of the loop antenna 11. It is good also as a structure expand
  • the shape of the loop antenna 11 may be other than the substantially rectangular shape as long as the antenna coil 12 is configured to circulate.
  • the shape of the loop antenna 31 is a shape that avoids the central hole 23a of the magnetic sheet 23, or a part of the loop antenna 41 is made of the magnetic sheet 24 as shown in FIG. 4B. It is good also as a shape avoided outside while approaching the center hole 24a.
  • NFC communication characteristics can be improved by achieving both performance and compatibility.
  • the main metal plate 3 such as an internal substrate / battery or other metal parts is used.
  • communication with the reader / writer 120 is performed using a large magnetic sheet 20 provided toward the outside of the loop antenna 11.
  • the width of the loop antenna 11 is set to about 1/3 of the width of the housing 32, that is, the width of the metal plate 3, and the size of the loop antenna 11 is set to the size of the IC tag 221 (see FIGS. 8A and 8B).
  • the small IC tag 221 and good communication characteristics are obtained by keeping the small size corresponding to the outer diameter.
  • the performance of the NFC antenna built into the electronic device 30 such as a mobile phone with respect to a small tag is greatly improved, and it is not affected by the size of the opposing antenna. Communication characteristics can be obtained. For this reason, the communication characteristics of both NFC and a small IC tag are compatible, and the NFC communication characteristics are improved.
  • FIG. 5 is a perspective view showing a schematic configuration of a wireless communication system to which an antenna device according to another embodiment of the present invention is applied.
  • An antenna device 201 according to the present embodiment is a device that is incorporated in an electronic device 230 and communicates with an external device via an electromagnetic field signal.
  • the antenna device 201 is incorporated in an RFID wireless communication system 300 as shown in FIG. Used.
  • the wireless communication system 300 includes an antenna device 201 provided in the electronic device 230 and a reader / writer 320 serving as an external device that accesses the antenna device 201.
  • the antenna device 201 and the reader / writer 320 are arranged to face each other in the xy plane of the three-dimensional orthogonal coordinate system xyz shown in FIG.
  • the reader / writer 320 functions as a transmitter that transmits a magnetic field in the z-axis direction to the antenna devices 201 that face each other in the xy plane.
  • the reader / writer 320 includes an antenna 321 that transmits a magnetic field toward the antenna device 201 And a control board 322 that communicates with the antenna device 201 that is inductively coupled via the antenna 321.
  • the reader / writer 320 is provided with a control board 322 electrically connected to the antenna 321.
  • a control circuit made of electronic components such as one or a plurality of integrated circuit chips is mounted. The control circuit executes various processes based on the data received from the antenna device 201.
  • the control circuit when transmitting data to the antenna device 201, the control circuit encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the modulation.
  • the signal is amplified, and the antenna 321 is driven by the amplified modulation signal.
  • the control circuit when reading data from the antenna device 201, the control circuit amplifies the modulation signal of the data received by the antenna 321, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
  • a coding system and a modulation system used in a general reader / writer are used.
  • a Manchester coding system or an ASK (Amplitude Shift Keying) modulation system is used.
  • ASK Amplitude Shift Keying
  • the antenna device 201 is incorporated in a housing 232 (see FIG. 7A) of an electronic device 230 such as a mobile phone that is arranged to face the reader / writer 320 in the xy plane shown in FIG. 5 during communication. Communicates with the reader / writer 320 via an electromagnetic field signal.
  • the antenna device 201 of this embodiment includes an antenna module 202, a metal plate 203, and a magnetic sheet 220 (see FIG. 7A).
  • the antenna module 202 is provided inside the housing 232 of the electronic device 230 and communicates with the reader / writer 320 that is inductively coupled.
  • the antenna module 202 includes a loop antenna 211, a communication processing unit 213, and a terminal unit 214.
  • the loop antenna 211 is provided inside the housing 232 of the electronic device 230, and the antenna coil 211a that can communicate with the reader / writer 320 is circulated by being inductively coupled to the reader / writer 320 serving as an external device.
  • the loop antenna 211 includes, for example, an antenna coil 211a formed by patterning a flexible conductive wire such as a flexible flat cable, and a terminal unit 214 that electrically connects the antenna coil 211a and the communication processing unit 213. And have been implemented.
  • the loop antenna 211 is arranged so that the main surface around which the antenna coil 211a circulates opposes the reader / writer 320 on the xy plane during communication.
  • the antenna coil 211 a When the antenna coil 211 a receives a magnetic field transmitted from the reader / writer 320, the antenna coil 211 a is magnetically coupled to the reader / writer 320 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 214. To the unit 213.
  • the communication processing unit 213 is driven by a current flowing through the antenna coil 211a and communicates with the reader / writer 320. Specifically, the communication processing unit 213 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory included in the communication processing unit 213. The communication processing unit 213 reads data to be transmitted to the reader / writer 320 from the internal memory, encodes the read data, modulates a carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The modulated radio wave is transmitted to the reader / writer 320 through the coil 211a. Note that the communication processing unit 213 may be driven not by the power flowing through the antenna coil 211a 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 metal plate 203 is provided in the housing of the electronic device 230 and serves as a first conductor facing the reader / writer 320 serving as an external device.
  • the metal plate 203 is provided in a housing of an electronic device such as a mobile phone, a smartphone, or a tablet PC, and constitutes a first conductor that faces the reader / writer 320 when the antenna module 202 communicates.
  • the first conductor for example, a metal cover affixed to the inner surface of the smartphone casing, a metal casing of a battery pack stored in the smartphone, or the back surface of the liquid crystal module of the tablet PC Corresponds to a metal plate or the like.
  • FIG. 6 is a diagram illustrating a schematic configuration of a circuit of a wireless communication system to which an antenna device according to another embodiment of the present invention is applied.
  • the loop antenna 211 that functions as the antenna circuit of the antenna device 201 includes the antenna coil 211a and the capacitor 211b.
  • the antenna coil 211a is formed in a rectangular shape, and generates a back electromotive force according to a change in magnetic flux interlinked with the antenna coil 211a among magnetic fluxes radiated from the antenna 322 of the reader / writer 320.
  • the capacitor 211b is a capacitor whose capacity can be adjusted by a control voltage output from the communication processing unit 213.
  • a variable capacity diode called a varicap or a variable capacity capacitor made of a ferroelectric material having excellent withstand voltage characteristics It is.
  • the loop antenna (antenna circuit) 211 includes an antenna coil 211a and a capacitor 211b by electrically connecting an antenna coil 211a and a capacitor 211b to form a resonance circuit, and changing the capacitance of the capacitor 211b. The resonance frequency of the resonance circuit is adjusted.
  • the communication processing unit 213 is configured by a microcomputer including a modulation / demodulation circuit 213a, a CPU 213b, and a memory 213c.
  • the modem circuit 213a performs a modulation process for generating a modulated wave in which data transmitted from the antenna circuit 211 to the reader / writer 320 is superimposed on a carrier. Also, the modem circuit 213a performs a demodulation process for extracting data from the modulated wave output from the reader / writer 320.
  • the CPU 213b reads the control voltage information stored in the memory 213c, applies the control voltage V to the capacitor 211b, and adjusts the capacitance of the capacitor 211b, thereby adjusting the resonance frequency due to the error and variation of the element at the time of manufacture. Correct the misalignment.
  • the resonance frequency of the antenna circuit 211 matches the oscillation frequency of the reader / writer 320 in consideration of the deviation between the resonance frequency of the antenna circuit 211 and the oscillation frequency at which the reader / writer 320 oscillates the magnetic field. Control voltage information for controlling the capacity of the capacitor 211b is stored.
  • the antenna 322 includes an antenna coil 321a and a capacitor 321b
  • the control board 322 includes a modulation / demodulation circuit 322a, a CPU 322b, and a memory 322c.
  • the antenna coil 321a is formed in, for example, a rectangular shape, and is magnetically coupled to the antenna coil 211a on the antenna device 201 side to transmit and receive various data such as commands and write data, and to be used in the antenna device 201. Supply power.
  • the capacitor 321b is connected to the antenna coil 321a to form a resonance circuit.
  • the modem circuit 322a performs a modulation process for generating a modulated wave in which data transmitted from the reader / writer 320 to the antenna device 201 is superimposed on a carrier. Further, the modem circuit 322a performs a demodulation process for extracting data from the modulated wave transmitted from the antenna device 201.
  • the CPU 322b controls the modulation / demodulation circuit 322a so as to send the data read from the memory 322c to the antenna device 201, and performs processing for writing the data demodulated by the modulation / demodulation circuit 322a into the memory 322c.
  • the loop antenna (antenna circuit) 211 of the antenna device 201 adjusts the capacitance of the capacitor 211b of the antenna circuit 211 by the control voltage controlled by the communication processing unit 213, thereby resonating the antenna circuit 211.
  • the frequency is matched with the oscillation frequency of the reader / writer 320 so that stable communication can be realized.
  • FIG. 7A and 7B are explanatory views showing an example of an electronic apparatus including an antenna device according to another embodiment of the present invention, FIG. 7A is a perspective view, and FIG. 7B is a plan view.
  • the antenna device 201 of the present embodiment is incorporated in the housing 232 of the electronic device 230 and communicates with the external device 320 (see FIG. 5) via an electromagnetic field signal.
  • the antenna device 201 includes a metal plate 203 as a first conductor facing the external device 320, a loop antenna 211 around which an antenna coil 211a that is inductively coupled to the external device 320, and a loop
  • the magnetic sheet 220 provided in the opposite side to the surface facing the external apparatus 320 of the antenna 211, and the inductance adjustment member 215 which can adjust the magnitude
  • the loop antenna 211 is provided in any vicinity of the outer edge portion 203a of the metal plate 203 serving as the first conductor.
  • “in the vicinity of the outer edge portion 203a of the metal plate 203” refers to a spatial region including a region near the distance from the outer edge portion 203a immediately above the outer edge portion 203a of the metal plate 203.
  • the loop antenna 211 has a substantially strip shape elongated in the longitudinal direction, and one conductor wire of the antenna coil 211a is circulated along the outer shape, and the center side thereof is an opening 212a.
  • the “longitudinal direction” of the loop antenna 211 indicates a direction in which the length or outer diameter indicates the maximum value, and in the case of a substantially rectangular shape, the long side direction, and in the case of a substantially elliptical shape, the long axis. The direction shall be indicated.
  • the magnetic sheet 220 has a function of guiding the magnetic flux sent from the reader / writer 320 during communication of the antenna module 202 to the opening 212a on the center side of the loop antenna 211 in order to enhance the communication characteristics of the antenna module 202.
  • the magnetic sheet 220 is made of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite, and is provided on the opposite side of the loop antenna 211 from the facing surface 211d of the external device 320, that is, on the lower side of the loop antenna 211.
  • the magnetic sheet 220 is affixed to the opposite side of the surface 211d of the loop antenna 211 facing the external device 320, but the magnetic sheet 220 may be provided through the opening 212a of the loop antenna 211. Good.
  • the inductance adjusting member 215 is formed on the inner side of the loop antenna 211 facing the facing surface 211d so as to be bridged across both edge portions 211c in the width direction of the loop antenna 211 (X direction shown in FIGS. 7A and 7B). It is provided so as to cover the vicinity of the center of the opening 212a.
  • the inductance adjusting member 215 can adjust the size of the inductance L of the loop antenna 211 by adjusting the size of the loop antenna 211 in the longitudinal direction.
  • the inductance L of the antenna device 201 including the substantially strip-shaped loop antenna 211 can be easily controlled in a state where the inductance L is mounted on the electronic device 230.
  • the inductance adjusting member 215 is provided on the surface facing the external device 320. However, if it is configured to straddle at least a part of the opening 212a of the loop antenna 211, the back surface thereof. It may be provided on the side. In particular, when the magnetic sheet 220 is configured to pass through the opening 212 a of the loop antenna 211, the inductance adjusting member 215 may be provided on any surface of the loop antenna 211.
  • FIGS. 8A and 8B are perspective views showing a schematic configuration of an antenna device according to another embodiment of the present invention.
  • the inductance adjustment member 215 is connected to the loop antenna 211, particularly when the loop antenna 211 has a substantially strip shape elongated in the longitudinal direction.
  • the inductance L is adjusted to a desired size when it is provided on any surface of the loop antenna 211, that is, on the side facing the external device 320 or on the back side thereof so as to straddle the opening 212a in the width direction. I found out that I can do it. It has also been found that the inductance L can be adjusted to a desired size by adjusting the size of the inductance adjusting member 215 in the longitudinal direction of the loop antenna 211.
  • the inductance adjusting member 215 is bridged in the vicinity of the center of the opening 212a of the loop antenna 211 over both edges 211c in the width direction of the loop antenna 211 (Y direction shown in FIGS. 8A and 8B). That is, the inductance adjusting member 215 is provided on the side facing the external device 320 so as to straddle at least a part of the opening 12a of the loop antenna 211.
  • the inductance adjusting member 215 can adjust the inductance L to a desired size by adjusting the size of the loop antenna 211 in the longitudinal direction.
  • the inductance adjustment step of adjusting the length of the inductance adjustment member 215 in the loop antenna 211 is performed. By doing so, the inductance of the loop antenna 211 can be adjusted to a desired size.
  • the inductance adjusting member 215 when the inductance adjusting member 215 is formed of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite, the longitudinal direction of the loop antenna 211 of the inductance adjusting member 215 Is increased, the inductance of the loop antenna 211 is increased. That is, when the magnetic sheet 216 made of a magnetic material is used as the inductance adjusting member 215, the magnetic flux near the center of the opening 212a of the loop antenna 211 is linked to the antenna coil 211a via the magnetic sheet 216. As a result, the inductance L of the loop antenna 211 increases. As described above, by increasing the size of the magnetic sheet 216 in the longitudinal direction of the loop antenna 211, the inductance can be increased to a desired size.
  • a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite
  • the loop antenna 211 is increased by increasing the length of the inductance adjusting member 215 in the loop antenna 211. Reduce the magnitude of the inductance. That is, as shown in FIG. 8B, when a metal foil 217 made of a good conductor is used as the inductance adjusting member 215, the effective area of the loop antenna 211 that receives the magnetic field from the reader / writer 320 is reduced. The inductance L of the loop antenna 211 decreases. Thus, by increasing the longitudinal size of the metal foil 217 in the loop antenna 211, the inductance can be reduced to a desired size.
  • a good conductor such as copper, silver, aluminum, or iron
  • the inductance adjusting member 215 is bridged in the vicinity of the center of the opening 212a of the loop antenna 211 over both edges 211c in the width direction of the loop antenna 211. Affixed to the loop antenna 211.
  • the magnetic sheet 216 is pasted as the inductance adjusting member 215 on the facing surface 211d side of the external device 320 so as to straddle the opening 212a of the loop antenna 211.
  • the metal foil 217 as the inductance adjusting member 215 is attached to the facing surface 211 d side of the external device 320 so as to straddle the opening 212 a of the loop antenna 211.
  • the inductance of the loop antenna 211 can be adjusted by attaching the inductance adjusting member 215 so as to close the opening 212a in the short side direction, that is, the width direction of the loop antenna 211.
  • the inductance adjusting member 215 is attached to the opening 212a of the loop antenna 211, it is more resistant to an error in the attaching position if it is attached a little wider over the entire width in the short side direction of the loop antenna 211. Since it increases, it is preferable.
  • the loop antenna 211 has a substantially strip shape elongated in the longitudinal direction, the distance between both edge portions 211c in the width direction (short side direction) of the loop antenna 211 is reduced.
  • the directions of currents flowing through the antenna coil 211a at both edges 211c in the longitudinal direction (long side direction) of the loop antenna 211 are opposite to each other through the opening 212a.
  • the magnetic fields generated by the current flowing through the antenna coil 212 in the longitudinal direction reinforce each other.
  • the magnetic fields generated by the current flowing through the antenna coil 212 in the longitudinal direction are weakened.
  • the magnetic sheet 216 is used as the inductance adjusting member 215 so as to straddle the opening 212a.
  • the magnetic field generated in the opening 212a can be absorbed efficiently and the inductance can be increased.
  • the metal foil 217 as the inductance adjusting member 215 so as to straddle the opening 212a the magnetic field generated in the opening 212a can be efficiently blocked and the inductance can be reduced.
  • the antenna device 201 of the present embodiment can adjust the inductance of the loop antenna 211 to a desired size by attaching the inductance adjusting member 215 so as to straddle the opening 212a of the loop antenna 211. That is, even when the antenna device 201 is mounted on the electronic device 230, the inductance can be easily adjusted by attaching the inductance adjusting member 215 so as to straddle the opening 212a of the loop antenna 211. Therefore, even when the same antenna device 201 and loop antenna 211 are mounted on different electronic devices, the inductance can be adjusted to a desired size in the mounted state, so that good communication characteristics of the electronic device can be obtained. become.
  • Example 1 NFC antenna shown in FIG. 3A a Type 1 NFC antenna shown in FIG. 3A
  • a Type 2 NFC antenna shown in FIG. 2B a conventional large NFC antenna (Benchmark) shown in FIG.
  • Benchmark a conventional large NFC antenna shown in FIG.
  • this invention is not limited to a present Example.
  • 10A and 10B 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. 10A is a perspective view, and FIG. 10B is a plan view. is there.
  • FIG. 3A As an example of the antenna device 1 according to an embodiment of the present invention, FIG. 3A, Type 1 shown in FIG. 3B, Type 2 shown in FIG. 2B, and the conventional antenna device (Benchmark) shown in FIG.
  • Benchmark As shown in FIGS. 10A and 10B, the coupling coefficient when the opposing reader / writer 120 is moved in a predetermined direction was obtained by simulation.
  • the antenna device 1 according to the embodiment of the present invention shown in FIG. 3A is used to make the antenna device 1 and the large antenna 121a of the reader / writer 120 (see FIG. 1) face each other.
  • the communication characteristics when the relative positional relationship between the loop antenna 11 and the large antenna 121a on the reader / writer 120 side was changed were evaluated.
  • the antenna device 1 according to the embodiment of the present invention shown in FIG. 2B is used to make the antenna device 1 and the large antenna 121a of the reader / writer 120 (see FIG. 1) face each other.
  • the communication characteristics when the relative positional relationship between the loop antenna 11 and the large antenna 121a on the reader / writer 120 side was changed were evaluated.
  • the loop antenna 111 and the reader / writer 120 are opposed to each other using an antenna device including a large loop antenna 111 as shown in FIG.
  • the communication characteristics when the relative positional relationship between the loop antenna 11 and the large antenna 121a on the reader / writer 120 side was changed were evaluated.
  • the communication characteristics when moved in the X and Y directions shown in FIGS. 10A and 10B were evaluated.
  • the antenna 101 of the reader / writer 120 is a two-turn coil 121a having an outer diameter defined in the xy axis direction of 70 mm.
  • the antenna size of the prior art (Benchmark) is 40 mm ⁇ 35 mm
  • the magnetic sheet (ferrite) size is 41 mm ⁇ 36 mm ⁇ 0.2 mm
  • the antenna size of Example 1 (Type 1) is the coil outer shape.
  • the antenna size of Example 2 (Type 2) was 27 mm ⁇ 35 mm for the coil outer shape and 56 mm ⁇ 36 mm ⁇ 0.2 mm for the ferrite outer shape.
  • Example 1 Example 2, and a comparative example are 4 coils, respectively. Furthermore, the distance between the large antenna 121a of the reader / writer 120 defined in the z-axis direction and the antennas of the first, second, and comparative examples was 55 mm.
  • FIG. 11A and FIG. 11B are graphs showing communication performance evaluation results for confirming the operation and effect of the antenna device according to the embodiment of the present invention.
  • FIG. 11A shows the movement of each antenna device in the X-axis direction.
  • FIG. 11B shows the evaluation result of the communication performance when each antenna device is moved in the Y-axis direction.
  • Example 1 and Example 2 are not so different from the comparative example as compared with the prior art as a comparative example. Therefore, even if the size of the loop antenna 11 is smaller than that of the conventional large antenna, by providing a magnetic sheet that expands toward the outside of both edges 11a of the loop antenna 11, the same as the conventional large antenna is provided. It can be seen that a certain degree of communication characteristics are secured.
  • FIG. 12A and 12B are explanatory views of an evaluation method for confirming other functions and effects of the antenna device according to the embodiment of the present invention, FIG. 12A is a perspective view, and FIG. 12B is a plan view. FIG.
  • FIG. 3A As an example of the antenna device 1 according to an embodiment of the present invention, FIG. 3A, Type 1 shown in FIG. 3B, Type 2 shown in FIG. 2B, and the conventional antenna device (Benchmark) shown in FIG.
  • Benchmark As shown in FIGS. 10A and 10B, the coupling coefficient when the opposing reader / writer 120 is moved in a predetermined direction was obtained by simulation.
  • the antenna device 1 according to the embodiment of the present invention shown in FIG. 3A is used so that the antenna device 1 and the small IC tag 151 face each other, and the loop antenna 11 and the small IC. Communication characteristics when the relative positional relationship of the tag 151 was changed were evaluated.
  • the antenna device 1 and the small IC tag 151 are opposed to each other using the antenna device 1 according to the embodiment of the present invention shown in FIG. Communication characteristics when the relative positional relationship of the tag 151 was changed were evaluated.
  • the small IC tag 221 was a 5-turn coil having a pattern outer shape of 20 mm ⁇ 25 mm.
  • the antenna size of the prior art (Benchmark) is 40 mm ⁇ 35 mm
  • the magnetic sheet (ferrite) size is 41 mm ⁇ 36 mm ⁇ 0.2 mm
  • the antenna size of Example 1 (Type 1) is the coil outer shape.
  • the antenna size of Example 2 (Type 2) was 27 mm ⁇ 35 mm for the coil outer shape and 56 mm ⁇ 36 mm ⁇ 0.2 mm for the ferrite outer shape.
  • Example 1 Example 2, and a comparative example are 4 coils, respectively. Furthermore, the distance between the large antenna 121a of the reader / writer 120 defined in the z-axis direction and the antennas of the first, second, and comparative examples was 1.5 mm.
  • FIG. 13A and 13B are graphs showing evaluation results of communication performance for confirming other functions and effects of the antenna device according to the embodiment of the present invention.
  • FIG. 13A shows each antenna device in the X-axis direction.
  • FIG. 13B shows the evaluation result of the communication performance when each antenna apparatus is moved in the Y-axis direction.
  • Example 1 Referring to the communication performance due to movement in the X-axis direction, as shown in FIG. 13A, it can be seen that the communication characteristics of both Example 1 and Example 2 are significantly improved as compared with the conventional technique as a comparative example. In particular, it can be seen from the verification results of Example 2 that by providing the magnetic sheet 20 including the inside of the opening 12a of the loop antenna 11, the communication characteristics with the small IC tag 151 are greatly improved.
  • both the first and second embodiments are significantly more effective in the range where the amount of movement is small compared to the related art as a comparative example. It can be seen that the communication characteristics have improved. In particular, it can be seen from the verification results of Example 2 that by providing the magnetic sheet 20 including the inside of the opening 12a of the loop antenna 11, the communication characteristics with the small IC tag 151 are greatly improved. However, it can be seen that when the movement amount is increased, the communication performance of the first and second embodiments is deteriorated and deteriorated as compared with the conventional example.
  • FIGS. 15A and 15B are FIGS. It is a figure which shows the magnetic field intensity of the antenna apparatus shown to FIG. 14B.
  • FIG. 16 is a perspective view showing a schematic configuration of the antenna device according to one embodiment of the present invention
  • FIGS. 17A and 17B are diagrams showing the magnetic field strength of the antenna device shown in FIG.
  • FIGS. 18A and 18B are perspective views showing a schematic configuration of an antenna device as a modification of the antenna device according to the embodiment of the present invention.
  • FIGS. 19A and 19B are shown in FIGS. 18A and 18B. It is a figure which shows the magnetic field intensity of an antenna apparatus.
  • a six-turn coil having an outer shape of 40 mm ⁇ 40 mm as shown in FIG. 14 is used as the loop antenna 411 of a normal rectangular antenna. Further, a ferrite sheet 420 having a thickness of 0.2 mm was attached to the back surface of the loop antenna 411 with a gap of 0.1 mm. Then, the magnetic field strength when a current of 50 mA was passed through the loop antenna 411 was calculated.
  • portions with a strong magnetic field strength are distributed along the inner and outer circumferences of the loop antenna 411 and that the magnetic field strengths on the inner and outer sides of the loop antenna 411 are low.
  • the magnetic field strength is particularly high on the inner peripheral side and the outer peripheral side of the loop 411, and the magnetic field strength on the inner side and the outer side of the inner periphery is low.
  • a substantially strip-shaped antenna elongated in the longitudinal direction.
  • a 6-coil coil having an outer shape of 40 mm ⁇ 12 mm as shown in FIG. 16 was used as the loop antenna 211 of the substantially strip-shaped antenna.
  • a ferrite sheet 220 having a thickness of 0.2 mm was attached to the back surface of the loop antenna 211 with a gap of 0.1 mm. Then, the magnetic field strength when a current of 50 mA was passed through the loop antenna 211 was calculated.
  • the loop antenna 211 has a configuration in which the opening at the center of the antenna is narrowed from both edge sides. It can be seen that the magnetic field strength is increasing. From this, it can be seen that it is effective to attach an inductance adjusting sheet to the central portion where the magnetic field strength is increased.
  • the magnetic field strength distribution of the antenna having a structure in which the magnetic sheet 520 is pierced into the loop antenna 511 was verified.
  • a 6-coil coil having an outer shape of 40 mm ⁇ 12 mm as shown in FIG. 18A was used as the loop antenna 511 of a substantially strip-shaped antenna.
  • a ferrite sheet 520 having a thickness of 0.2 mm is pierced into the opening 511a of the loop antenna 511 and attached to the loop antenna 511 with a gap of 0.1 mm. .
  • the magnetic field strength when a current of 50 mA was passed through the loop antenna 511 was calculated.
  • the magnetic field intensity directly above the ferrite sheet 520 is weakened, but the opening of the loop antenna 511 is narrowed from both edge sides. Therefore, it can be seen that the magnetic field strength at the center of the loop antenna 511 is particularly strong. From this, it can be seen that it is effective to attach an inductance adjusting sheet to the central portion where the magnetic field strength is increased.
  • FIG. 20A and 20B are explanatory views of an embodiment of changing the width of the inductance adjusting member
  • FIG. 20A is an explanatory view of changing the width of the inductance adjusting member made of a magnetic material
  • FIG. 20B is an inductance made of a good conductor. Explanatory drawing of the width change of an adjustment member is shown.
  • FIG. 21 is a graph showing the results of an example of changing the width of the inductance adjusting member.
  • the adjustment effect when a sheet serving as an inductance adjusting member was attached to the surface of a 6-coil having an outer shape of 40 mm ⁇ 12 mm was confirmed.
  • a magnetic sheet (relative magnetic permeability: 100, width 14 mm) having a thickness of 100 ⁇ m is placed at a central portion of the loop antenna 211 with a gap of 0.1 mm.
  • the effect was confirmed by pasting and changing the length.
  • an aluminum foil having a thickness of 50 ⁇ m (width 14 mm) is attached to the center of the loop antenna 211 with a gap of 0.1 mm, The effect was confirmed by changing the length.
  • the inductance L can be adjusted to a desired size by adjusting the size of the inductance adjusting member 215 in the longitudinal direction of the loop antenna 211.
  • FIGS. 23A and 23B are explanatory views of an embodiment of position change of an inductance adjustment member made of a good conductor.
  • FIG. 24 is a graph showing the results of an example of changing the position of the inductance adjusting member.
  • the change in inductance depending on the position where the inductance adjusting member was attached was evaluated. Specifically, as shown in FIG. 22A, when the magnetic sheet 216 is used as the inductance adjusting member 215, the change in inductance accompanying the position change from the central portion to the end portion of the magnetic sheet 216, and FIG. As described above, when the metal foil 217 was used as the inductance adjusting member 215, the change in the inductance accompanying the change in position from the central portion to the end portion of the metal foil 217 was verified. In addition, the size of each sheet affixed at this time was 14 mm ⁇ 10 mm.
  • both the magnetic sheet 216 and the metal foil 217 show almost no change in inductance characteristics when moved about 5 mm from the center. That is, it is considered that the resistance to the attaching accuracy of the inductance adjusting member is high.
  • the magnetic sheet 216 even if the amount of movement from the central portion is increased, almost no change in the characteristics of the inductance is seen, whereas in the metal foil 217, when the amount of movement from the central portion is increased, the inductance is increased. It turns out that it falls significantly. From this, when the magnetic sheet 216 is used as the inductance adjusting member, it is possible to maintain a high resistance to the bonding accuracy. However, when the metal foil 217 is used, the magnetic sheet 216 is resistant to the bonding accuracy. Is considered to be low.

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Abstract

L'objectif de l'invention est d'obtenir une compatibilité entre la capacité de communication d'un dispositif de lecture/écriture de grande taille et celle d'une étiquette à circuits intégrés de petite taille, ce qui permet ainsi d'améliorer des caractéristiques de communication en champ proche (NFC). Un équipement d'antenne, qui est incorporé dans un dispositif électronique (30) et communique avec un dispositif externe par l'intermédiaire de signaux de champ électromagnétique, comprend : une antenne cadre (11) ayant une largeur qui est la dimension de l'antenne cadre (11) dans la direction de la largeur de cette dernière et qui est définie par deux bords (11a) de l'antenne cadre (11) distants de distances prédéterminées respectives d'au moins ceux respectifs des deux bords du boîtier (32) du dispositif électronique dans la direction de la largeur de ce dernier, ladite antenne cadre (11) étant constituée d'un enroulement à prise d'antenne (12) qui est couplé de manière inductive au dispositif externe ; et une feuille magnétique (20) qui est fabriquée à partir d'une substance magnétique et qui est placée sur le côté opposé de l'antenne cadre par rapport au côté de cette dernière faisant face au dispositif externe, ladite feuille magnétique (20) s'étendant au moins depuis les deux bords de l'antenne cadre dans la direction de la largeur de cette dernière vers les deux bords (32a) du boîtier dans la direction de la largeur de ce dernier.
PCT/JP2015/053080 2014-03-28 2015-02-04 Équipement d'antenne, dispositif électronique, et procédé de réglage d'inductance de matériel d'antenne WO2015146298A1 (fr)

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JP2014069502A JP2015192385A (ja) 2014-03-28 2014-03-28 アンテナ装置、及びアンテナ装置のインダクタンス調整方法
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207442A (zh) * 2016-06-29 2016-12-07 青岛海信移动通信技术股份有限公司 一种移动终端的nfc天线和移动终端
RU2704626C1 (ru) * 2016-07-13 2019-10-30 Ниппон Стил Корпорейшн Устройство регулировки индуктивности

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI801384B (zh) * 2017-09-01 2023-05-11 澳大利亞商伊門斯機器人控股有限公司 用於行動裝置通訊之天線控制的系統及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013011865A1 (fr) * 2011-07-19 2013-01-24 株式会社村田製作所 Module d'antenne, dispositif d'antenne, étiquette rfid et dispositif terminal de communication
WO2013035820A1 (fr) * 2011-09-09 2013-03-14 株式会社村田製作所 Dispositif d'antenne, étiquette rfid et article métallique comprenant dispositif d'antenne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013011865A1 (fr) * 2011-07-19 2013-01-24 株式会社村田製作所 Module d'antenne, dispositif d'antenne, étiquette rfid et dispositif terminal de communication
WO2013035820A1 (fr) * 2011-09-09 2013-03-14 株式会社村田製作所 Dispositif d'antenne, étiquette rfid et article métallique comprenant dispositif d'antenne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207442A (zh) * 2016-06-29 2016-12-07 青岛海信移动通信技术股份有限公司 一种移动终端的nfc天线和移动终端
RU2704626C1 (ru) * 2016-07-13 2019-10-30 Ниппон Стил Корпорейшн Устройство регулировки индуктивности

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