JP2010263486A - Antenna device - Google Patents

Antenna device Download PDF

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JP2010263486A
JP2010263486A JP2009113797A JP2009113797A JP2010263486A JP 2010263486 A JP2010263486 A JP 2010263486A JP 2009113797 A JP2009113797 A JP 2009113797A JP 2009113797 A JP2009113797 A JP 2009113797A JP 2010263486 A JP2010263486 A JP 2010263486A
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antenna
magnetic
conductor
magnetic core
coil conductor
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JP2009113797A
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JP4978657B2 (en
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Hiromitsu Ito
宏充 伊藤
Hiroyuki Kubo
浩行 久保
Kuniaki Yosui
邦明 用水
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Priority to JP2009113797A priority Critical patent/JP4978657B2/en
Priority to GB201007345A priority patent/GB2470113B/en
Priority to CN 201010172729 priority patent/CN101882711B/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • 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
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To configure an antenna device in which magnetic coupling with an antenna at an opposite party is strong and communication performance is improved. <P>SOLUTION: The antenna device is comprised of a magnetic substance antenna 51 and a conductor plate 40. The magnetic substance antenna 51 is comprised of a flexible substrate 10 and a magnetic substance core 20. The flexible substrate 10 is configured by forming a spiral coil conductor 12 with its winding center as a conductor opening CW with respect to a base 11. In the magnetic substance core 20, size L in the longitudinal direction of the conductor plate 40 is shorter than that of the flexible substrate 10. The magnetic substance core 20 is disposed at a position closer to the first terminal side S1 of the conductor plate 40 and at a position not to cover a coil conductor part A3 present farthest from the first terminal side S1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、外部機器と電磁界信号を介して通信するＲＦＩＤ（Radio Frequency Identification）システム等に用いられるアンテナ装置に関するものである。   The present invention relates to an antenna device used in an RFID (Radio Frequency Identification) system that communicates with an external device via an electromagnetic field signal.

近年、利用が拡大しているＲＦＩＤシステムにおいては、携帯電話等の携帯電子機器とリーダ・ライタの各々に情報通信用のアンテナを搭載し、互いにデータを交信している。このようなＲＦＩＤ用のアンテナ装置として、磁性体コアを備えた磁性体アンテナが特許文献１〜３に開示されている。   In an RFID system that has been used in recent years, an antenna for information communication is mounted on each of a portable electronic device such as a mobile phone and a reader / writer to exchange data with each other. As such an RFID antenna device, Patent Documents 1 to 3 disclose magnetic antennas having a magnetic core.

ここで特許文献１〜３の各アンテナを携帯電子機器に組み込めばどのような構成になるかについて、各図を参照して説明する。
図１は特許文献１のアンテナを携帯電子機器に組み込んだ状態を示す三面図である。磁性体アンテナ３１は、基材１１に渦巻き状に形成されたコイル導体１２を備えたフレキシブル基板１０に対して、コイル導体１２と同等の形状を有するシート状または平板状の磁性体コア２０を設けたものである。 Here, with reference to each figure, it will be described what kind of configuration the antennas of Patent Documents 1 to 3 are built into a portable electronic device.
FIG. 1 is a trihedral view showing a state in which the antenna of Patent Document 1 is incorporated in a portable electronic device. The magnetic antenna 31 is provided with a sheet-like or flat magnetic core 20 having a shape equivalent to that of the coil conductor 12 with respect to the flexible substrate 10 provided with the coil conductor 12 formed in a spiral shape on the base material 11. It is a thing.

特許文献２のアンテナは、コイル導体が同心円盤状に形成され、コイル導体の径中心とコイル導体の内周部との中間に形成される磁束発生部位からコイル導体の外側に延長して高透磁率のシート状磁性体が配置されたものである。   In the antenna of Patent Document 2, the coil conductor is formed in a concentric disk shape, extending from the magnetic flux generation site formed between the center of the diameter of the coil conductor and the inner periphery of the coil conductor to the outside of the coil conductor. A magnetic sheet-like magnetic material is arranged.

図３は前記特許文献２の構成を矩形状の磁性体アンテナにして携帯電子機器に組み込んだ状態を示す二面図である。磁性体アンテナ３２は、基材１１に渦巻き状に形成されたコイル導体１２を備えたフレキシブル基板１０に対して、コイル導体１２の中心とコイル導体１２の内周部との中間からコイル導体１２の外側にまで延びる位置に磁性体コア２０を配置している。   FIG. 3 is a two-side view showing a state in which the configuration of Patent Document 2 is incorporated into a portable electronic device as a rectangular magnetic antenna. With respect to the flexible substrate 10 including the coil conductor 12 formed in a spiral shape on the base material 11, the magnetic antenna 32 has a coil antenna 12 from the middle between the center of the coil conductor 12 and the inner peripheral portion of the coil conductor 12. The magnetic core 20 is disposed at a position extending to the outside.

特許文献３のアンテナは、ループ状のコイル導体の内側に対応する位置にのみ磁性体コアが設けられたものである。
図４は前記特許文献３の構成を矩形状の磁性体アンテナにし、携帯電子機器に組み込んだ状態を示す二面図である。磁性体アンテナ３３は、基材１１に渦巻き状に形成されたコイル導体１２を備えたフレキシブル基板１０に対して、コイル導体１２の内周部より内側に磁性体コア２０を配置している。 The antenna of Patent Document 3 is provided with a magnetic core only at a position corresponding to the inside of a loop-shaped coil conductor.
FIG. 4 is a two-sided view showing a state in which the configuration of Patent Document 3 is a rectangular magnetic antenna and incorporated in a portable electronic device. In the magnetic antenna 33, the magnetic core 20 is disposed on the inner side of the inner peripheral portion of the coil conductor 12 with respect to the flexible substrate 10 including the coil conductor 12 formed in a spiral shape on the base material 11.

特開２００２−２９８０９５号公報JP 2002-298095 A 特開２００２−２０８８１４号公報JP 2002-208814 A 特開２００５−２１０２２３号公報JP 2005-210223 A

図１に示したアンテナにおいては、コイル導体の自己インダクタンスが、通信相手となるコイル導体との相互インダクタンスに比べて大きい。すなわち通信相手（リーダ・ライタ、ＩＣカード、ＩＣカード機能付き携帯端末等）のアンテナと磁気的結合しない磁束の割合が多いため、弱い結合しか得られず、通信性能が劣化する。   In the antenna shown in FIG. 1, the self-inductance of the coil conductor is larger than the mutual inductance with the coil conductor that is the communication partner. That is, since there is a large proportion of magnetic flux that is not magnetically coupled to the antenna of the communication partner (reader / writer, IC card, portable terminal with IC card function, etc.), only weak coupling can be obtained, and communication performance deteriorates.

また、磁性体コア内での磁気エネルギーの損失が大きいため、通信性能が劣化する。すなわち、図１に示したようにコイル導体１２の背後に携帯端末機器の基板等の導体板４０が存在すると、通信相手のアンテナの作る磁界の一部は、図１中に磁束ＭＦａで示すような経路を通る。この磁束ＭＦａはコイル導体１２のループと鎖交しないため、アンテナ間の結合にはほとんど寄与しない。   In addition, since the loss of magnetic energy in the magnetic core is large, the communication performance deteriorates. That is, as shown in FIG. 1, when a conductor plate 40 such as a substrate of a portable terminal device is present behind the coil conductor 12, a part of the magnetic field created by the antenna of the communication partner is indicated by a magnetic flux MFa in FIG. Take a simple route. Since the magnetic flux MFa does not interlink with the loop of the coil conductor 12, it hardly contributes to the coupling between the antennas.

また、磁性体アンテナ３１は、図外のコンデンサと組みあわせて共振回路が構成されるが、決められた周波数で共振させるため、コイル導体の採れる自己インダクタンス値には上限がある。そのため、コイル導体で結合にほとんど寄与しないで、言わば「近回り」して磁性体コアを磁束が通過することによって自己インダクタンスを増やすのは好ましくない。さらに、磁性体コア２０内を磁束が通ると、磁性体コア内でエネルギー損失が起こる。特に、磁束密度の高い部分（導体と磁性体コアが近接しているところ）で損失が大きい。図２はこの磁気エネルギーの損失について示す三面図である。図２において、相手側アンテナと磁束が鎖交せず、磁性体コア２０を近回りする磁束ＭＦｄによって、図２（Ｃ）でハッチングした部分で大きな損失が生じる。   The magnetic antenna 31 is configured with a resonance circuit in combination with a capacitor (not shown). However, since the magnetic antenna 31 resonates at a predetermined frequency, there is an upper limit in the self-inductance value that can be taken by the coil conductor. For this reason, it is not preferable to increase the self-inductance by causing the magnetic flux to pass through the magnetic core without making a contribution to the coupling with the coil conductor. Furthermore, when a magnetic flux passes through the magnetic core 20, energy loss occurs in the magnetic core. In particular, the loss is large at a portion where the magnetic flux density is high (where the conductor and the magnetic core are close to each other). FIG. 2 is a three-side view showing the loss of magnetic energy. In FIG. 2, the magnetic flux does not interlink with the counterpart antenna, and a large loss occurs in the hatched portion in FIG.

図３に示したアンテナにおいては、図３にコイル導体部Ａ１で示す磁束の抜ける箇所に磁性体がないため磁束が抜けにくく、また開口面での磁性体の占める割合が小さいため磁束が入りにくい、という問題がある。   In the antenna shown in FIG. 3, there is no magnetic material at the location where the magnetic flux is shown by the coil conductor portion A1 in FIG. There is a problem.

図４に示したアンテナにおいては、図３にコイル導体部Ａ１，Ａ２で示す磁束の抜ける箇所に磁性体がないため磁束が抜けにくく、また開口面での磁性体の占める割合が小さいため磁束が入りにくい、という問題がある。   In the antenna shown in FIG. 4, since there is no magnetic material at the location where the magnetic flux is shown by the coil conductor portions A1 and A2 in FIG. There is a problem that it is difficult to enter.

そこで、この発明の目的は、相手側アンテナとの磁気的結合が強く、通信性能の高いアンテナ装置を提供することにある。   Accordingly, an object of the present invention is to provide an antenna device that has strong magnetic coupling with a counterpart antenna and high communication performance.

前記課題を解決するために、この発明のアンテナ装置は次のように構成する。
（１）コイル導体が形成されたフレキシブル基板、及び前記フレキシブル基板に接してまたは近接して配置される磁性体コアを備えた磁性体アンテナと、
前記磁性体アンテナに近接配置される導体板と、を備えたアンテナ装置において、
前記コイル導体は巻回中心部を導体開口部とする渦巻き状に形成され、
前記磁性体コアは、前記導体板の第１の端辺寄りの位置で、且つ前記第１の端辺から最も離れた位置にあるコイル導体部を覆わない位置に配置されたものとする。 In order to solve the above problems, the antenna device of the present invention is configured as follows.
(1) A flexible antenna on which a coil conductor is formed, and a magnetic antenna provided with a magnetic core disposed in contact with or close to the flexible substrate;
In an antenna device comprising a conductor plate disposed close to the magnetic antenna,
The coil conductor is formed in a spiral shape with the winding center as a conductor opening,
The magnetic core is disposed at a position near the first end side of the conductor plate and at a position not covering the coil conductor portion that is farthest from the first end side.

（２）例えば、前記磁性体コアは、前記導体板の前記第１の端辺に対向する第２の端辺から前記導体板の長さの約０．４倍以上離れた位置にある導体部を覆わない位置に配置される。
この構成によれば、相手側アンテナと磁気的結合強度が増し、通信性能が向上する。また、磁性体コア内での磁気エネルギーの損失が減少し、通信性能が向上する。さらに、磁性体コアのサイズを小さくすることができる。 (2) For example, the magnetic core is a conductor portion located at a position separated from the second end side facing the first end side of the conductor plate by at least about 0.4 times the length of the conductor plate. It is arranged at a position not covering.
According to this configuration, the magnetic coupling strength with the counterpart antenna is increased, and the communication performance is improved. Further, loss of magnetic energy in the magnetic core is reduced, and communication performance is improved. Furthermore, the size of the magnetic core can be reduced.

（３）また、前記磁性体コアは、前記コイル導体のうち、前記導体板の第１・第２の端辺に直交する第３・第４の端辺の一方または両方に近接する部分に前記磁性体コアが覆わない構造とする。
この構成によれば、通信性能をほとんど劣化させることなく、インダクタンスを変えることができる。また、磁性体コアのサイズを小さくできる。 (3) Further, the magnetic core may be formed on a portion of the coil conductor adjacent to one or both of the third and fourth end sides orthogonal to the first and second end sides of the conductor plate. The magnetic core is not covered.
According to this configuration, the inductance can be changed with almost no deterioration in communication performance. Further, the size of the magnetic core can be reduced.

この発明によれば、相手側アンテナと磁気的結合する磁束の割合が増え、通信性能が向上する。また、磁性体コア内での磁気エネルギーの損失が減少し、通信性能が向上する。   According to the present invention, the proportion of magnetic flux that is magnetically coupled to the counterpart antenna is increased, and communication performance is improved. Further, loss of magnetic energy in the magnetic core is reduced, and communication performance is improved.

特許文献１のアンテナを携帯電子機器に組み込んだ状態を示す三面図である。It is a three-plane figure which shows the state which incorporated the antenna of patent document 1 in the portable electronic device. 図１に示したアンテナ装置の磁気エネルギーの損失について示す三面図である。FIG. 3 is a three-sided view showing a loss of magnetic energy of the antenna device shown in FIG. 特許文献２の構成を矩形状の磁性体アンテナにして携帯電子機器に組み込んだ状態を示す二面図である。It is a two-plane figure which shows the state which made the structure of patent document 2 the rectangular-shaped magnetic body antenna, and was integrated in the portable electronic device. 特許文献３の構成を矩形状の磁性体アンテナにして携帯電子機器に組み込んだ状態を示す二面図である。It is a double view which shows the state which made the structure of patent document 3 the rectangular-shaped magnetic body antenna, and was integrated in the portable electronic device. 第１の実施形態に係るアンテナ装置の三面図である。It is a trihedral view of the antenna device according to the first embodiment. 図５に示した導体板４０に対する磁性体アンテナ５１の配置位置と通信相手側アンテナとの結合量との関係を示す図である。It is a figure which shows the relationship between the arrangement position of the magnetic body antenna 51 with respect to the conductor plate shown in FIG. 図７（Ａ）は第２の実施形態に係るアンテナ装置に用いる磁性体アンテナ５２の上面図である。図７（Ｂ）はその下面図である。FIG. 7A is a top view of the magnetic antenna 52 used in the antenna device according to the second embodiment. FIG. 7B is a bottom view thereof. 第２の実施形態に係るアンテナ装置に用いる別の磁性体アンテナ５３の構成を示す図であり、図８（Ａ）は磁性体アンテナ５３の上面図、図８（Ｂ）は下面図である。It is a figure which shows the structure of another magnetic body antenna 53 used for the antenna apparatus which concerns on 2nd Embodiment, FIG. 8 (A) is a top view of the magnetic body antenna 53, and FIG. 8 (B) is a bottom view. 導体板４０の短辺方向の寸法Ｘに対する第３の端辺Ｓ３及び第４の端辺Ｓ４から磁性体アンテナ５３のコイル導体１２までの寸法ｘの関係を示す三面図である。FIG. 6 is a three-view diagram showing the relationship of the dimension x from the third end side S3 and the fourth end side S4 to the coil conductor 12 of the magnetic antenna 53 with respect to the dimension X in the short side direction of the conductor plate 40. ｘ／Ｘに対する結合量の関係、及びｘ／Ｘに対する磁性体アンテナ５３のインダクタンスの関係を示す図である。It is a figure which shows the relationship of the coupling amount with respect to x / X, and the relationship of the inductance of the magnetic body antenna 53 with respect to x / X. 導体板４０の第１・第２の端辺に直交する第３・第４の端辺に近接するコイル導体部Ａ１の定義について説明するための図である。4 is a diagram for describing a definition of a coil conductor portion A1 that is close to third and fourth end sides orthogonal to first and second end sides of a conductor plate 40. FIG. 第３の実施形態に係るアンテナ装置に用いる磁性体アンテナ５４の構成を示す図であり、図１２（Ａ）は磁性体アンテナ５４の上面図、図１２（Ｂ）は下面図である。It is a figure which shows the structure of the magnetic body antenna 54 used for the antenna apparatus which concerns on 3rd Embodiment, FIG. 12 (A) is a top view of the magnetic body antenna 54, and FIG.12 (B) is a bottom view. 第３の実施形態に係るアンテナ装置に用いる別の磁性体アンテナ５５の構成を示す図であり、図１３（Ａ）は磁性体アンテナ５５の上面図、図１３（Ｂ）は下面図である。It is a figure which shows the structure of another magnetic body antenna 55 used for the antenna apparatus which concerns on 3rd Embodiment, FIG. 13 (A) is a top view of the magnetic body antenna 55, and FIG. 13 (B) is a bottom view.

《第１の実施形態》
図５は第１の実施形態に係るアンテナ装置の三面図である。このアンテナ装置は磁性体アンテナ５１と導体板４０とで構成されている。磁性体アンテナ５１はフレキシブル基板１０と磁性体コア２０とで構成されている。フレキシブル基板１０は基材１１に対して巻回中心部を導体開口部ＣＷとする渦巻き状のコイル導体１２が形成されて構成されている。 << First Embodiment >>
FIG. 5 is a three-side view of the antenna device according to the first embodiment. This antenna device includes a magnetic antenna 51 and a conductor plate 40. The magnetic antenna 51 includes the flexible substrate 10 and the magnetic core 20. The flexible substrate 10 is configured by forming a spiral coil conductor 12 having a winding center portion as a conductor opening CW with respect to a base material 11.

磁性体コア２０の寸法Ｌ（導体板４０の長手方向寸法）はフレキシブル基板１０より短い。磁性体コア２０は、導体板４０の第１の端辺Ｓ１寄りの位置で且つ第１の端辺Ｓ１から最も離れた位置にあるコイル導体部Ａ３を覆わない位置に配置されている。このような構成により、次の効果を奏する。   The dimension L of the magnetic core 20 (the longitudinal dimension of the conductor plate 40) is shorter than that of the flexible substrate 10. The magnetic core 20 is disposed at a position near the first end side S1 of the conductor plate 40 and at a position not covering the coil conductor portion A3 located farthest from the first end side S1. Such a configuration provides the following effects.

図２に示したアンテナ装置と異なり、磁束が近回りして通る磁性体コア２０内でエネルギー損失が少なくなり、アンテナ効率が向上する。
また、図３に示したアンテナ装置と異なり、磁束が抜けようとするコイル導体部Ａ１に磁性体コア２０が存在するため、相手側アンテナとの磁界結合が高まる。 Unlike the antenna device shown in FIG. 2, energy loss is reduced in the magnetic core 20 through which the magnetic flux passes and the antenna efficiency is improved.
In addition, unlike the antenna device shown in FIG. 3, the magnetic core 20 is present in the coil conductor part A1 from which the magnetic flux is about to escape, so that magnetic field coupling with the counterpart antenna is enhanced.

さらに、導体板４０の第１の端辺Ｓ１寄りのコイル導体部Ａ２部分に磁性体コア２０が存在するので、図４に示した構造のアンテナ装置に比べて磁性体アンテナ５１の導体開口部ＣＷに磁束が抜けやすくなり、アンテナ特性が向上する。   Furthermore, since the magnetic core 20 is present in the coil conductor portion A2 near the first end S1 of the conductor plate 40, the conductor opening CW of the magnetic antenna 51 compared to the antenna device having the structure shown in FIG. Thus, the magnetic flux is easily released, and the antenna characteristics are improved.

図６は、図５に示した導体板４０に対する磁性体アンテナ５１の配置位置と通信相手側アンテナとの結合量との関係を示す図である。ここで寸法Ｙは図５に示した導体板４０の長手方向の寸法である。寸法ｙは導体板４０の第１の端辺Ｓ１に対向する第２の端辺Ｓ２からコイル導体部Ａ３部分までの距離である。   FIG. 6 is a diagram showing the relationship between the arrangement position of the magnetic antenna 51 with respect to the conductor plate 40 shown in FIG. 5 and the coupling amount between the communication partner antennas. Here, the dimension Y is a dimension in the longitudinal direction of the conductor plate 40 shown in FIG. The dimension y is a distance from the second end side S2 facing the first end side S1 of the conductor plate 40 to the coil conductor portion A3.

図６の横軸は前記寸法Ｙに対する寸法ｙの比、縦軸は通信相手側アンテナとの結合量である。図６において、折れ線Ａは、図５に示した磁性体コア２０がコイル導体部Ａ３にまで存在する構造（コイル導体１２の形成領域の全体に亘って磁性体コア２０が存在する構造）での特性、折れ線Ｂは、図５に示した構造のアンテナ装置の特性である。   In FIG. 6, the horizontal axis represents the ratio of the dimension y to the dimension Y, and the vertical axis represents the amount of coupling with the communication partner antenna. In FIG. 6, the broken line A is a structure in which the magnetic core 20 shown in FIG. 5 exists up to the coil conductor portion A3 (a structure in which the magnetic core 20 exists over the entire region where the coil conductor 12 is formed). The characteristic, the broken line B, is the characteristic of the antenna device having the structure shown in FIG.

前記寸法ｙが小さい範囲（ｙ／Ｙ＜０．４）では、コイル導体１２の形成領域の全体に亘って磁性体コア２０が存在する方が結合量は大きい。   In the range where the dimension y is small (y / Y <0.4), the coupling amount is larger when the magnetic core 20 is present over the entire formation region of the coil conductor 12.

しかし、ｙ／Ｙ≧０．４であると、図５に示したように、導体板４０の第２の端辺Ｓ２に近い側のコイル導体部Ａ３に磁性体コア２０が存在しない構造である方が強い結合が得られる。   However, when y / Y ≧ 0.4, as shown in FIG. 5, the magnetic core 20 does not exist in the coil conductor portion A3 on the side close to the second end S2 of the conductor plate 40. A stronger bond is obtained.

したがって、磁性体アンテナ５１をいずれか一方の端辺寄りに配置する場合には、図５に示したとおり、導体板４０の第１の端辺Ｓ１寄りに配置し、その第１の端辺Ｓ１から最も離れた位置にあるコイル導体部Ａ３を磁性体コア２０が覆わないように構成する。   Therefore, when the magnetic antenna 51 is disposed near one of the end sides, as shown in FIG. 5, the magnetic antenna 51 is disposed near the first end S1 of the conductor plate 40, and the first end S1 thereof. The coil conductor portion A3 located farthest from the magnetic core 20 is configured not to be covered by the magnetic core 20.

《第２の実施形態》
第１の実施形態では、導体板４０の長手方向について、フレキシブル基板１０に対する磁性体コア２０の配置位置をどのようにするかについて示したが、第２の実施形態では、前述と同様の現象を利用して、磁性体コア２０の、導体板４０の第１・第２の端辺に直交する第３の端辺または第４の端辺に近接する部分をどのような形状にするかについて示すものである。 << Second Embodiment >>
In the first embodiment, the arrangement position of the magnetic core 20 with respect to the flexible substrate 10 in the longitudinal direction of the conductor plate 40 is shown. However, in the second embodiment, the same phenomenon as described above is performed. The shape of the portion of the magnetic core 20 that is close to the third end side or the fourth end side orthogonal to the first and second end sides of the conductor plate 40 is shown. Is.

図７（Ａ）は第２の実施形態に係るアンテナ装置に用いる磁性体アンテナ５２の上面図である。図７（Ｂ）はその下面図である。
磁性体アンテナ５２は、フレキシブル基板１０及び磁性体コア２０で構成されている。フレキシブル基板１０は矩形状の基材１１に対して巻回中心部を導体開口部ＣＷとする渦巻き状のコイル導体１２が形成されて構成されている。 FIG. 7A is a top view of the magnetic antenna 52 used in the antenna device according to the second embodiment. FIG. 7B is a bottom view thereof.
The magnetic antenna 52 includes the flexible substrate 10 and the magnetic core 20. The flexible substrate 10 is configured by forming a spiral coil conductor 12 having a winding center portion as a conductor opening CW on a rectangular base material 11.

図７では、磁性体アンテナ５２のみを示しているが、この磁性体アンテナ５２を、第１の実施形態で図５に示した磁性体アンテナ５１と置換する。すなわち、磁性体アンテナ５２は、図５に示したアンテナ装置と同様に、導体板４０の一つの端辺寄りに配置される。図７に示した例では、導体板４０の第１の端辺Ｓ１から最も離れた位置にあるコイル導体部Ａ３を覆わないだけでなく、導体板４０の第１・第２の端辺に直交する第３の端辺に近接するコイル導体部Ａ１にも磁性体コア２０が覆わないように磁性体コア２０を設けている。   Although only the magnetic antenna 52 is shown in FIG. 7, this magnetic antenna 52 is replaced with the magnetic antenna 51 shown in FIG. 5 in the first embodiment. That is, the magnetic antenna 52 is arranged near one end side of the conductor plate 40 as in the antenna device shown in FIG. In the example shown in FIG. 7, the coil conductor portion A3 located farthest from the first end S1 of the conductor plate 40 is not covered, but is orthogonal to the first and second end sides of the conductor plate 40. The magnetic core 20 is provided so that the magnetic core 20 is not covered also in the coil conductor portion A1 adjacent to the third end side.

図８は第２の実施形態に係るアンテナ装置に用いる別の磁性体アンテナ５３の構成を示す図であり、図８（Ａ）は磁性体アンテナ５３の上面図、図８（Ｂ）は下面図である。この磁性体アンテナ５３は、図５に示したアンテナ装置と同様に、導体板４０の一つの端辺寄りに配置される。   FIG. 8 is a diagram showing a configuration of another magnetic antenna 53 used in the antenna device according to the second embodiment. FIG. 8A is a top view of the magnetic antenna 53, and FIG. 8B is a bottom view. It is. The magnetic antenna 53 is arranged near one end side of the conductor plate 40 as in the antenna device shown in FIG.

図８の磁性体アンテナ５３の磁性体コア２０は、導体板４０の第１の端辺Ｓ１から最も離れた位置にあるコイル導体部Ａ３を覆わないだけでなく、導体板４０の第１・第２の端辺に直交する第３の端辺及び第４の端辺に近接するコイル導体部Ａ１，Ａ１にも磁性体コア２０が覆わないように磁性体コア２０を設けている。   The magnetic core 20 of the magnetic antenna 53 in FIG. 8 does not cover the coil conductor portion A3 located farthest from the first end S1 of the conductor plate 40, but also the first and second of the conductor plate 40. The magnetic core 20 is provided so that the magnetic core 20 is not covered also in the coil conductor portions A1 and A1 adjacent to the third end and the fourth end that are orthogonal to the two ends.

図９は、導体板４０の短辺方向の寸法Ｘに対する第３の端辺Ｓ３及び第４の端辺Ｓ４から磁性体アンテナ５３のコイル導体１２までの寸法ｘの関係を示す三面図である。
また、図１０は前記ｘ／Ｘに対する結合量の関係、及び前記ｘ／Ｘに対する磁性体アンテナ５３のインダクタンスの関係を示す図である。ここで折れ線Ａは、図９に示した磁性体アンテナ５３の磁性体コア２０がＡ１，Ａ１部分にまで覆っている場合の特性、Ｂは図８及び図９に示した磁性体アンテナ５３を用いた場合の特性である。 FIG. 9 is a three-view diagram showing the relationship of the dimension x from the third end S3 and the fourth end S4 to the coil conductor 12 of the magnetic antenna 53 with respect to the dimension X in the short side direction of the conductor plate 40.
FIG. 10 is a diagram showing the relationship of the coupling amount with respect to x / X and the relationship of the inductance of the magnetic antenna 53 with respect to x / X. Here, the polygonal line A indicates the characteristics when the magnetic core 20 of the magnetic antenna 53 shown in FIG. 9 covers the A1 and A1 portions, and B indicates that the magnetic antenna 53 shown in FIGS. 8 and 9 is used. It is a characteristic when there is.

このようにｘ／Ｘの変化に対するインダクタンスの変化傾向は同等であるが、ｘ／Ｘの変化に対する結合量の変化は小さくなる。そのため、通信性能を殆ど劣化させることなくインダクタンスを容易に設定できるようになる。   Thus, the change tendency of the inductance with respect to the change of x / X is the same, but the change of the coupling amount with respect to the change of x / X becomes small. Therefore, the inductance can be easily set with almost no deterioration in communication performance.

なお、導体板４０の第１・第２の端辺に直交する第３・第４の端辺に近接するコイル導体部Ａ１は次のように定義することもできる。
図１１に示すように、導体板４０の各辺からコイル導体１２までの距離をｘ１，ｘ２，ｙ１，ｙ２とし、また対向する辺の長さをＸ，Ｙとしたとき、ｘ１／Ｘ、ｘ２／Ｘ、ｙ１／Ｙ，ｙ２／Ｙの値で導体板４０の端辺からの「遠さ」を定義すれば、２番目に遠い導体部と３番目に遠い導体部が前記コイル導体部Ａ１，Ａ１である。
この２番目と３番目に遠い導体部の一方または両方を磁性体コアで覆わないように磁性体コアを設ければよい。 The coil conductor portion A1 adjacent to the third and fourth end sides orthogonal to the first and second end sides of the conductor plate 40 can also be defined as follows.
As shown in FIG. 11, when the distance from each side of the conductor plate 40 to the coil conductor 12 is x1, x2, y1, y2, and the lengths of the opposite sides are X, Y, x1 / X, x2 If the “distance” from the end of the conductor plate 40 is defined by the values of / X, y1 / Y, y2 / Y, the second-most distant conductor part and the third-distant conductor part are the coil conductor parts A1, A1.
A magnetic core may be provided so that one or both of the second and third furthest conductor portions are not covered with the magnetic core.

《第３の実施形態》
図１２は第３の実施形態に係るアンテナ装置に用いる磁性体アンテナ５４の構成を示す図であり、図１２（Ａ）は磁性体アンテナ５４の上面図、図１２（Ｂ）は下面図である。この磁性体アンテナ５４は、図５に示したアンテナ装置と同様に、導体板４０の一つの端辺寄りに配置される。 << Third Embodiment >>
12A and 12B are diagrams showing a configuration of the magnetic antenna 54 used in the antenna device according to the third embodiment. FIG. 12A is a top view of the magnetic antenna 54, and FIG. . The magnetic antenna 54 is disposed near one end side of the conductor plate 40 as in the antenna device shown in FIG.

第２の実施形態で図７に示した磁性体アンテナ５２と異なるのは、磁性体コア２０の形状である。図１２に示す磁性体アンテナ５４の磁性体コア２０は、導体板４０の第１の端辺Ｓ１及び第２の端辺Ｓ２に直交する端辺に近接するコイル導体部Ａ１の一部に磁性体コア２０が覆わないように磁性体コア２０を設けている。   What is different from the magnetic antenna 52 shown in FIG. 7 in the second embodiment is the shape of the magnetic core 20. The magnetic core 20 of the magnetic antenna 54 shown in FIG. 12 has a magnetic body on a part of the coil conductor portion A1 adjacent to the end sides orthogonal to the first end side S1 and the second end side S2 of the conductor plate 40. The magnetic core 20 is provided so that the core 20 is not covered.

図１３は第３の実施形態に係るアンテナ装置に用いる別の磁性体アンテナ５５の構成を示す図であり、図１３（Ａ）は磁性体アンテナ５５の上面図、図１３（Ｂ）は下面図である。この磁性体アンテナ５５は、図５に示したアンテナ装置と同様に、導体板４０の一つの端辺寄りに配置される。   FIG. 13 is a diagram showing a configuration of another magnetic antenna 55 used in the antenna device according to the third embodiment. FIG. 13 (A) is a top view of the magnetic antenna 55, and FIG. 13 (B) is a bottom view. It is. The magnetic antenna 55 is disposed near one end of the conductor plate 40, similarly to the antenna device shown in FIG.

第２の実施形態で図７に示した磁性体アンテナ５２と異なるのは、磁性体コア２０の形状である。図１３に示す磁性体アンテナ５５の磁性体コア２０は、導体板４０の第１の端辺Ｓ１及び第２の端辺Ｓ２に直交する端辺に近接する二つのコイル導体部Ａ１，Ａ１の一部に磁性体コア２０が覆わないように磁性体コア２０を設けている。   What is different from the magnetic antenna 52 shown in FIG. 7 in the second embodiment is the shape of the magnetic core 20. The magnetic core 20 of the magnetic antenna 55 shown in FIG. 13 is one of the two coil conductor portions A1 and A1 that are close to the end sides orthogonal to the first end side S1 and the second end side S2 of the conductor plate 40. The magnetic core 20 is provided so that the magnetic core 20 does not cover the portion.

このように磁性体コア２０の、導体板４０の第１・第２の端辺に直交する第３の端辺または第４の端辺に近接する部分の全部または一部を磁性体コアで覆わないように構成することにより、第２の実施形態の場合と同様に、通信性能を殆ど劣化させることなくインダクタンスを容易に設定できるようになる。   In this way, all or part of the portion adjacent to the third end or the fourth end of the magnetic core 20 perpendicular to the first and second ends of the conductor plate 40 is covered with the magnetic core. By adopting such a configuration, the inductance can be easily set with almost no deterioration in communication performance, as in the case of the second embodiment.

Ａ１，Ａ２，Ａ３…コイル導体部
ＣＷ…導体開口部
ＭＦａ…磁束
ＭＦｄ…磁束
Ｓ１…第１の端辺
Ｓ２…第２の端辺
Ｓ３…第３の端辺
Ｓ４…第４の端辺
１０…フレキシブル基板
１１…基材
１２…コイル導体
２０…磁性体コア
３１〜３３…従来技術による磁性体アンテナ
４０…導体板
５１〜５５…磁性体アンテナ A1, A2, A3 ... Coil conductor CW ... Conductor opening MFa ... Magnetic flux MFd ... Magnetic flux S1 ... First edge S2 ... Second edge S3 ... Third edge S4 ... Fourth edge 10 ... Flexible substrate 11 ... base material 12 ... coil conductor 20 ... magnetic cores 31 to 33 ... magnetic antenna 40 according to prior art ... conductor plates 51 to 55 ... magnetic antenna

Claims (3)

コイル導体が形成されたフレキシブル基板、及び前記フレキシブル基板に接してまたは近接して配置される磁性体コアを備えた磁性体アンテナと、
前記磁性体アンテナに近接配置される導体板と、を備えたアンテナ装置において、
前記コイル導体は巻回中心部を導体開口部とする渦巻き状に形成され、
前記磁性体コアは、前記導体板の第１の端辺寄りの位置で、且つ前記第１の端辺から最も離れた位置にあるコイル導体部を覆わない位置に配置された、アンテナ装置。 A magnetic substrate including a flexible substrate on which a coil conductor is formed, and a magnetic core disposed in contact with or in proximity to the flexible substrate;
In an antenna device comprising a conductor plate disposed close to the magnetic antenna,
The coil conductor is formed in a spiral shape with the winding center as a conductor opening,
The antenna device, wherein the magnetic core is arranged at a position near the first end side of the conductor plate and at a position not covering the coil conductor portion located farthest from the first end side. 前記磁性体コアは、前記導体板の前記第１の端辺に対向する第２の端辺から前記導体板の長さの約０．４倍以上離れた位置にある導体部を覆わない位置に配置された、請求項１に記載のアンテナ装置。   The magnetic core is in a position that does not cover a conductor portion that is located at a position that is about 0.4 times or more the length of the conductor plate from the second end side facing the first end side of the conductor plate. The antenna device according to claim 1, which is arranged. 前記磁性体コアは、前記コイル導体のうち、前記導体板の第１・第２の端辺に直交する第３・第４の端辺の一方または両方に近接する部分に前記磁性体コアが覆わない、請求項１または２に記載のアンテナ装置。   The magnetic core is covered with a portion of the coil conductor adjacent to one or both of the third and fourth end sides orthogonal to the first and second end sides of the conductor plate. The antenna device according to claim 1, wherein there is no antenna device.
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GB201007345D0 (en) 2010-06-16
GB2470113A (en) 2010-11-10

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