WO2013157191A1 - Dispositif à bobine et terminal sans fil mobile - Google Patents

Dispositif à bobine et terminal sans fil mobile Download PDF

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Publication number
WO2013157191A1
WO2013157191A1 PCT/JP2013/001619 JP2013001619W WO2013157191A1 WO 2013157191 A1 WO2013157191 A1 WO 2013157191A1 JP 2013001619 W JP2013001619 W JP 2013001619W WO 2013157191 A1 WO2013157191 A1 WO 2013157191A1
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WO
WIPO (PCT)
Prior art keywords
loop coil
coil
frequency band
loop
impedance
Prior art date
Application number
PCT/JP2013/001619
Other languages
English (en)
Japanese (ja)
Inventor
貴紀 廣部
佐藤　浩
小柳　芳雄
上島　博幸
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013157191A1 publication Critical patent/WO2013157191A1/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
    • H01Q7/005—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 variable reactance for tuning the antenna
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

Definitions

  • the present invention relates to a coil device used for non-contact charging and a portable wireless terminal equipped with the coil device.
  • the non-contact IC card system described in Patent Document 1 has a non-contact IC card function and a reader / writer function, and a portable electronic device including an IC card circuit and a reader / writer circuit corresponding to each function,
  • a non-contact IC card system in which a loop antenna for an IC card circuit and a loop antenna for a reader / writer circuit can be electromagnetically coupled the loop between the IC card circuit loop antenna and the IC card circuit and the loop for the reader / writer circuit
  • a switch is provided between the antenna and the reader / writer circuit, and both switches are configured such that when one switch is closed, the other switch is opened.
  • the wireless card described in Patent Document 2 is a wireless card that respectively receives a power wave of a first frequency transmitted from an external communication device and a data wave of a second frequency different from the first frequency.
  • the first coil forming the power wave antenna for receiving the power wave is disposed at the center of one surface of the rectangular card-like substrate formed of a member that transmits the radio wave, and the data wave is transmitted.
  • a second coil forming a data wave antenna to be received was disposed so as to form a double ring with the first coil at the center of one surface of the substrate.
  • a wireless device including a plurality of antennas described in Patent Document 3 includes a plurality of antennas, and in the wireless device that selects and connects these antennas to a wireless circuit, a voltage of a standing wave of each antenna is applied to each antenna.
  • Switch means capable of grounding the maximum distribution point is provided, and among these switch means, means for operating the switch means of the unselected antenna to perform grounding is provided.
  • the present invention has been made in view of such circumstances, and a coil device and a portable radio that can suppress the deterioration of coupling between two coils for power transmission and communication and can reduce the size of the device.
  • the purpose is to provide a terminal.
  • the coil device of the present invention includes a first loop coil that operates in a first frequency band, and a second loop coil that operates in a second frequency band, and the first loop coil has an impedance adjustment. Electrically connected to a circuit, the second loop coil is electrically connected to an input / output unit, and the impedance adjusting circuit is connected to the first loop coil than the first frequency band. In the second frequency band, the impedance is low.
  • the impedance adjustment circuit adjusts the impedance of the terminal end of the first loop coil to be lower in the second frequency band than in the first frequency band.
  • the deterioration of the coupling with the first loop coil is reduced, the performance deterioration of the second loop coil can be kept low, and the communication performance of the second loop coil can be improved.
  • the first loop coil and the second loop coil are concentrically arranged.
  • the apparatus can be miniaturized.
  • the second frequency band is higher than the first frequency band.
  • the termination condition of the first loop coil is By making the impedance low in the second frequency band, it is possible to suppress the performance deterioration of the second loop coil.
  • the impedance adjustment circuit has an impedance in the second frequency band of 1 k ⁇ or less.
  • the impedance adjustment circuit has an input impedance in the second frequency band of 200 ⁇ or less.
  • the portable wireless terminal of the present invention includes the coil device.
  • a portable wireless terminal with good communication performance can be realized by using the second loop coil for wireless communication of a wireless communication standard such as Felica (registered trademark) or NFC (Near Field Communication). Further, since the coil device can be miniaturized, the portable radio terminal can be miniaturized.
  • a wireless communication standard such as Felica (registered trademark) or NFC (Near Field Communication).
  • the present invention in a coil device provided with two coils for power transmission and communication, it is possible to keep the coupling deterioration of the two coils low and to reduce the size of the device.
  • FIG. 1A and 1B are views showing a coil device according to an embodiment of the present invention, where FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line A-A ′ in FIG.
  • the figure which shows the impedance adjustment circuit of the high pass filter structure used for the coil apparatus of FIG. The figure which shows the impedance characteristic of the impedance adjustment circuit of a high pass filter structure shown in FIG.
  • FIG. 1A and 1B are diagrams showing a coil device according to an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line A-A ′ in FIG.
  • a coil device 1 according to the present embodiment includes a first loop coil 2 that operates in a first frequency band f1, and an impedance adjustment circuit 3 that is electrically connected to the first loop coil 2.
  • a second loop coil 4 operating in a second frequency band f2 (f2> f1) higher than the first frequency band f1, and an input / output unit 5 electrically connected to the second loop coil 4.
  • a magnetic body 6 on which the first loop coil 2 and the second loop coil 4 are mounted.
  • the first loop coil 2, the second loop coil 4, and the magnetic body 6 except for the impedance adjustment circuit 3 and the input / output unit 5 of the coil device 1 constitute a coil module 7.
  • the magnetic body 6 is formed in a square plate shape, and the first loop coil 2 and the second loop coil 4 are mounted on one surface thereof.
  • the first loop coil 2 is used for power transmission for charging, and the second loop coil 4 is used for wireless communication such as Felica (registered trademark) and NFC.
  • the first loop coil 2 and the second loop coil 4 are both formed in a circular spiral shape, and the size of the second loop coil 4 is larger than that of the first loop coil 2.
  • the loop coil 2 is disposed inside the second loop coil 4. That is, the first loop coil 2 and the second loop coil 4 are concentrically arranged on the same plane. By arranging in this way, the range through which the magnetic flux passes can be shared, and the apparatus can be miniaturized. Note that the first loop coil 2 and the second loop coil 4 are not necessarily arranged concentrically, and may be eccentric.
  • the impedance adjustment circuit 3 determines the termination condition of the first loop coil 2 operating in the first frequency band f1 as the second frequency band. This is a low impedance for f2.
  • the impedance in the second frequency band of the impedance adjustment circuit 3 may be 1 k ⁇ or less, but is preferably 200 ⁇ or less.
  • the coupling between the second loop coil 4 and the first loop coil 2 is weakened, and the performance degradation of the second loop coil 4 can be suppressed to a low level.
  • Specific examples of the configuration of the impedance adjustment circuit 3 include a high-pass filter configuration and a band-pass filter configuration.
  • FIG. 2 is a circuit diagram showing the impedance adjustment circuit 3 having a high-pass filter configuration.
  • the circuit configuration has a low impedance between the terminals P1 and P2 connected to the first loop coil 2.
  • the terminals P3-P4 are connected to the charging circuit unit side (see FIG. 12).
  • FIG. 3 is a diagram showing impedance characteristics of the impedance adjustment circuit 3 having the high-pass filter configuration shown in FIG. As shown in the figure, the impedance is low in the second frequency band f2.
  • the first frequency band f1 is, for example, 100 kHz
  • the second frequency band f2 is, for example, 13.56 MHz.
  • FIG. 4 is a circuit diagram showing an impedance adjustment circuit 3 having a band-pass filter configuration.
  • the circuit configuration has a low impedance between the terminals P1 and P2 connected to the first loop coil 2.
  • the terminals P3-P4 are connected to the charging circuit unit side (see FIG. 12).
  • FIG. 5 is a diagram showing impedance characteristics of the impedance adjustment circuit 3 having the bandpass filter configuration shown in FIG. As shown in the figure, the impedance is low in the second frequency band f2.
  • FIGS. 6A and 6B are diagrams showing a specific example of the coil module of the coil device 1 shown in FIGS. 1A and 1B.
  • FIG. 6A is a plan view
  • FIG. 6B is an AA ′ line in FIG. It is line sectional drawing.
  • 7 is a plan view showing the first loop coil and the first magnetic body of the coil module shown in FIGS. 6A and 6B
  • FIG. 8 is the coil shown in FIGS. 6A and 6B.
  • It is a top view which shows the 2nd loop coil and 2nd magnetic body of a module.
  • the coil module of this specific example has a shape different from that of the coil module 7 of FIGS. 1 (a) and 1 (b), but is common to the coil module 7 of FIGS. 1 (a) and 1 (b). Parts are given the same reference numerals.
  • the first loop coil 2 is mounted on one surface of the first magnetic body 10 formed in a rectangular shape.
  • the second loop coil 4 is mounted on one surface of the second magnetic body 11 formed in a rectangular ring shape. Both the first loop coil 2 and the second loop coil 4 are formed in a rectangular shape.
  • the first loop coil 2 is disposed inside the second loop coil 4.
  • a substrate 13 is disposed. Terminals 2 a and 2 b are formed at both ends of the first loop coil 2, and terminals 4 a and 4 b are formed at both ends of the second loop coil 4.
  • the first loop coil 2 has a longitudinal dimension of 35 mm, a transverse dimension of 28 mm, the first magnetic body 10 has a longitudinal dimension of 45 mm, and a transverse dimension of 33 mm. It has become.
  • the dimension of the longitudinal direction of the 2nd magnetic body 11 is 52 mm, and the dimension of a transversal direction is 45 mm.
  • the dimension in the longitudinal direction of the space formed by the second magnetic body 11 is 46 mm
  • the dimension in the lateral direction is 38 mm. Note that the dimensions of the second loop coil 4 are substantially the same as the dimensions of the second magnetic body 11 and are therefore omitted.
  • FIG. 9 is a Smith chart showing the impedance characteristics of the second loop coil 4 of the coil module 7.
  • A of the figure shows the case where the first loop coil 2 side is opened as the condition (1) (that is, the impedance becomes high).
  • the inductance value of the second loop coil 4 at this time is 0.624 ⁇ H.
  • (b) of the figure shows a case where the first loop coil 2 side is short-circuited (that is, the impedance is lowered) as the condition (2).
  • unnecessary resonance does not occur because the first loop coil 2 is hardly affected.
  • the inductance value of the second loop coil 4 is 0.837 ⁇ H.
  • the inductance value of the second loop coil 4 decreases due to the influence of the first loop coil 2.
  • the impedance adjustment circuit 3 in which the impedance is lowered in the second frequency band f2 that is the operating frequency band of the second loop coil 4
  • the second loop coil 4 becomes less susceptible to the influence of the first loop coil 2. This prevents a decrease in inductance value.
  • FIG. 10 is a diagram showing a communication distance measurement result when RC-S461C (R / W: reader / writer manufactured by Sony Corporation) is used as the coil module 7 of FIGS. 6 (a) and 6 (b). .
  • the resonance frequency was 13.55 MHz and the communication distance was 108 mm.
  • the resonance frequency was 13.52 MHz and the communication distance was 136 mm.
  • the communication distance is long. Needless to say, a longer communication distance is better.
  • FIG. 11 is a graph showing impedance characteristics of the second loop coil 4 of the coil module 7 of FIGS. 6 (a) and 6 (b).
  • the horizontal axis represents the termination resistance ( ⁇ ), and the vertical axis represents the inductance value (nH).
  • the inductance value is higher when the impedance is lower. That is, the inductance value of the second loop coil 4 increases as the impedance value of the first loop coil 2 decreases.
  • FIG. 12 is a block diagram showing a schematic configuration of a part of a portable radio terminal using the coil device 1 described above.
  • the portable wireless terminal 20 shown in FIG. 1 includes a charging circuit unit 21, an external wireless circuit 22, a Felica circuit control CPU (Central Processing Unit) 23, and a battery 24.
  • the charging circuit unit 21 includes a rectifier circuit 210, a load modulation circuit 211, and a charging circuit control CPU (Central Processing Unit) 212.
  • the rectifier circuit 210 and the load modulation circuit 211 perform wireless power transmission with the first loop coil 2.
  • the external radio circuit 22 performs radio transmission as Felica (registered trademark) or NFC communication.
  • the charging circuit control CPU 212 controls the rectifier circuit 210 and the load modulation circuit 211.
  • the Felica circuit control CPU 23 controls the external radio circuit 22.
  • the first loop coil 2 that operates in the first frequency band f1 and the second loop that operates in the second frequency band f2 (> f1).
  • the first loop coil 2 is electrically connected to the impedance adjustment circuit 3
  • the second loop coil 4 is electrically connected to the input / output unit 5, and the impedance adjustment circuit 3 is Since the first loop coil 2 is configured to have a lower impedance in the second frequency band f2 than in the first frequency band f1, the first loop is obtained when the second loop coil 4 is used.
  • the deterioration of the coupling with the coil 2 is reduced, the performance deterioration of the second loop coil 4 can be kept low, and the communication performance of the second loop coil 4 can be improved.
  • first loop coil 2 and the second loop coil 4 are arranged concentrically and on the same plane, the range through which the magnetic flux passes can be shared by the first and second loop coils 2, 4. 1 can be miniaturized.
  • the present invention has an effect that in a coil device including two coils for power transmission and communication, the deterioration of coupling between the two coils can be suppressed to a low level, and the size can be reduced. And can be applied to portable wireless terminals such as smartphones.

Abstract

L'invention concerne un dispositif comprenant : une première bobine en boucle (2) fonctionnant dans une première bande de fréquences (f1) ; et une deuxième bobine en boucle (4) fonctionnant dans une deuxième bande de fréquences (f2); la première bobine en boucle (2) étant reliée électriquement à un circuit de réglage de l'impédance (3) et le circuit de réglage de l'impédance (3) étant configuré pour donner à la première bobine en boucle (2) une impédance plus faible dans la deuxième bande de fréquences (f2) que dans la première bande de fréquences (f1). Par conséquent, lorsque la deuxième bobine en boucle (4) est utilisée, la dégradation du couplage par rapport à la première bobine en boucle (2) est réduite et la dégradation des performances de la deuxième bobine en boucle (4) peut être maintenue à un niveau minimum.
PCT/JP2013/001619 2012-04-17 2013-03-12 Dispositif à bobine et terminal sans fil mobile WO2013157191A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012094100 2012-04-17
JP2012-094100 2012-04-17

Publications (1)

Publication Number Publication Date
WO2013157191A1 true WO2013157191A1 (fr) 2013-10-24

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015147133A1 (fr) * 2014-03-28 2015-10-01 株式会社村田製作所 Dispositif d'antenne et appareil électronique
JP2016523071A (ja) * 2013-05-31 2016-08-04 ノキア テクノロジーズ オーユー マルチコイルワイヤレス給電装置
JP2017045988A (ja) * 2015-08-25 2017-03-02 モトローラ モビリティ エルエルシーＭｏｔｏｒｏｌａ Ｍｏｂｉｌｉｔｙ Ｌｌｃ 複数種類のワイヤレス充電および近距離無線通信に対応する多重コイル構造
CN107771282A (zh) * 2015-06-22 2018-03-06 布利斯脱大学 无线超声波传感器
TWI656754B (zh) * 2014-08-28 2019-04-11 鴻準精密工業股份有限公司 具有nfc和無線充電功能的可攜式裝置
WO2019176637A1 (fr) * 2018-03-13 2019-09-19 株式会社村田製作所 Dispositif d'antenne, système de communication et dispositif électronique
CN107771282B (zh) * 2015-06-22 2024-04-19 布利斯脱大学 无线超声波传感器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09326736A (ja) * 1996-06-03 1997-12-16 Mitsubishi Electric Corp ワイヤレス送受信システム用２次側回路装置およびワイヤレス送受信システム用誘導コイル
JP2012019302A (ja) * 2010-07-07 2012-01-26 Nec Tokin Corp アンテナモジュール及び非接触電力伝送装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09326736A (ja) * 1996-06-03 1997-12-16 Mitsubishi Electric Corp ワイヤレス送受信システム用２次側回路装置およびワイヤレス送受信システム用誘導コイル
JP2012019302A (ja) * 2010-07-07 2012-01-26 Nec Tokin Corp アンテナモジュール及び非接触電力伝送装置

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016523071A (ja) * 2013-05-31 2016-08-04 ノキア テクノロジーズ オーユー マルチコイルワイヤレス給電装置
US10044234B2 (en) 2013-05-31 2018-08-07 Nokia Technologies Oy Multi-coil wireless power apparatus
WO2015147133A1 (fr) * 2014-03-28 2015-10-01 株式会社村田製作所 Dispositif d'antenne et appareil électronique
US9941576B2 (en) 2014-03-28 2018-04-10 Murata Manufacturing Co., Ltd. Antenna device and electronic device
TWI656754B (zh) * 2014-08-28 2019-04-11 鴻準精密工業股份有限公司 具有nfc和無線充電功能的可攜式裝置
CN107771282A (zh) * 2015-06-22 2018-03-06 布利斯脱大学 无线超声波传感器
CN107771282B (zh) * 2015-06-22 2024-04-19 布利斯脱大学 无线超声波传感器
JP2017045988A (ja) * 2015-08-25 2017-03-02 モトローラ モビリティ エルエルシーＭｏｔｏｒｏｌａ Ｍｏｂｉｌｉｔｙ Ｌｌｃ 複数種類のワイヤレス充電および近距離無線通信に対応する多重コイル構造
US9825484B2 (en) 2015-08-25 2017-11-21 Motorola Mobility Llc Multiple coil structure for supporting multiple types of wireless charging and near field communications
WO2019176637A1 (fr) * 2018-03-13 2019-09-19 株式会社村田製作所 Dispositif d'antenne, système de communication et dispositif électronique
JP6635230B1 (ja) * 2018-03-13 2020-01-22 株式会社村田製作所 アンテナ装置、通信システム、及び電子機器

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