JP4883125B2 - antenna - Google Patents

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JP4883125B2
JP4883125B2 JP2009091381A JP2009091381A JP4883125B2 JP 4883125 B2 JP4883125 B2 JP 4883125B2 JP 2009091381 A JP2009091381 A JP 2009091381A JP 2009091381 A JP2009091381 A JP 2009091381A JP 4883125 B2 JP4883125 B2 JP 4883125B2
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conductor
antenna
coil
magnetic core
antenna coil
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JP2010245776A (en
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邦明 用水
浩行 久保
宏充 伊藤
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Priority to JP2009091381A priority Critical patent/JP4883125B2/en
Priority to GB1005634.9A priority patent/GB2469209B/en
Priority to CN2010101547243A priority patent/CN101859923B/en
Priority to CN201310052252.4A priority patent/CN103178346B/en
Publication of JP2010245776A publication Critical patent/JP2010245776A/en
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Publication of JP4883125B2 publication Critical patent/JP4883125B2/en
Priority to US13/765,541 priority patent/US10135140B2/en
Priority to US15/249,794 priority patent/US9865923B2/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
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)
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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に関するものである。   The present invention relates to an antenna used in an RFID (Radio Frequency Identification) system that communicates with an external device via an electromagnetic field signal.

ＲＦＩＤシステムで用いられる携帯電子機器に搭載されるアンテナが特許文献１に開示されている。図１は特許文献１に記載されるアンテナ装置の構造を示す正面図である。   Patent Document 1 discloses an antenna mounted on a portable electronic device used in an RFID system. FIG. 1 is a front view showing the structure of the antenna device described in Patent Document 1. FIG.

図１に示されるアンテナコイル３０は、フィルム３２ａ上の平面内で導体３１（３１ａ，３１ｂ，３１ｅ，３１ｄ）を渦巻き状に巻回して構成された空芯コイル３２と、その空芯コイル３２の平面とほぼ平行となるように空芯コイル３２に挿入された平板状の磁芯部材３３とを備えている。空芯コイル３２には孔３２ｄが設けられ、この孔３２ｄに磁芯部材３３が挿入されている。第１ターミナル３１ａと連結導体３１ｅとはスルーホール３２ｂで連結され、第２ターミナル３１ｂと連結導体３１ｅとはスルーホール３２ｃで連結されている。そして、この磁性体アンテナが導電板３４上に配置されている。   An antenna coil 30 shown in FIG. 1 includes an air-core coil 32 formed by spirally winding a conductor 31 (31a, 31b, 31e, 31d) in a plane on a film 32a, and the air-core coil 32. A flat magnetic core member 33 inserted into the air-core coil 32 so as to be substantially parallel to the plane is provided. The air core coil 32 is provided with a hole 32d, and a magnetic core member 33 is inserted into the hole 32d. The first terminal 31a and the connecting conductor 31e are connected by a through hole 32b, and the second terminal 31b and the connecting conductor 31e are connected by a through hole 32c. The magnetic antenna is disposed on the conductive plate 34.

特開２００２−３２５０１３号公報JP 2002-325013 A

図１に示した特許文献１の磁性体アンテナは、裏面が金属板であり、磁束は横方向（図１に示した状態では右から左方向）に抜け、それによってコイル導体に起電力が発生し、電流が流れる。   The magnetic antenna of Patent Document 1 shown in FIG. 1 is a metal plate on the back surface, and the magnetic flux is released in the lateral direction (from right to left in the state shown in FIG. 1), thereby generating an electromotive force in the coil conductor. Current flows.

ところが、特許文献１の磁性体アンテナは、図１に示したとおり、背後の導電板３４に平行な磁束と結合させる構造である。そのため、例えば携帯電話端末に搭載した場合に、筐体内部の回路基板に平行に実装すると、携帯電話端末をリーダライタの面に対して平行にかざして使用する、といったことができない。また、導電板３４の中心付近にアンテナコイルを置くと、短い距離範囲でしか通信できず、しかも、最大通信距離が得られる位置が筺体の中心から大きくずれた位置になるため、使い勝手が悪いという問題がある。   However, as shown in FIG. 1, the magnetic antenna of Patent Document 1 has a structure in which a magnetic flux parallel to the back conductive plate 34 is coupled. For this reason, for example, when mounted on a mobile phone terminal, if the mobile phone terminal is mounted parallel to the circuit board inside the housing, the mobile phone terminal cannot be used while being held parallel to the surface of the reader / writer. In addition, when the antenna coil is placed near the center of the conductive plate 34, communication is possible only within a short distance range, and the position where the maximum communication distance can be obtained is a position greatly deviated from the center of the housing, which is inconvenient. There's a problem.

そこで、この発明の目的は、通信可能最長距離を長くでき、しかも通信可能距離が最も長くなる位置を筐体のほぼ中心にできるようにしたアンテナを提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna that can increase the longest communicable distance and that the position where the communicable distance is the longest can be approximately at the center of the casing.

前記課題を解決するためにこの発明のアンテナは、コイル導体が形成されたフレキシブル基板と、第１主面及び第２主面を有する板状の磁性体コアと、を備えたアンテナコイルが平面導体に近接配置されたアンテナにおいて、
前記平面導体の外形は、前記アンテナコイルの平面外形よりも大きく、
前記磁性体コアの第１主面は前記平面導体に対面し、
前記アンテナコイルは前記平面導体の縁端部寄りに配置され、
前記コイル導体のうち、前記磁性体コアの第１主面に近接する第１の導体部分と、前記磁性体コアの第２主面に近接する第２の導体部分とは、前記磁性体コアの第１主面または第２主面の法線方向から見て重ならない位置にあり、
第２の導体部分は第１の導体部分に比べて前記平面導体の前記縁端部側となる位置に配置され、
前記コイル導体のコイル軸は前記平面導体の前記縁端部側を向いている。 In order to solve the above problems, an antenna according to the present invention includes a flexible substrate on which a coil conductor is formed and a plate-like magnetic core having a first main surface and a second main surface. For antennas placed close to
The outer shape of the planar conductor is larger than the planar outer shape of the antenna coil,
The first main surface of the magnetic core faces the planar conductor,
The antenna coil is disposed near the edge of the planar conductor;
Among the coil conductors, a first conductor portion that is close to the first main surface of the magnetic core and a second conductor portion that is close to the second main surface of the magnetic core are: Located in a position that does not overlap when viewed from the normal direction of the first main surface or the second main surface,
The second conductor portion is disposed at a position on the edge side of the planar conductor as compared to the first conductor portion,
The coil axis of the coil conductor faces the edge side of the planar conductor.

また、前記コイル導体は、フレキシブル基板に形成された、ヘリカル状のコイルを所定の切り開き線で切り開かれた形状であり、前記フレキシブル基板は前記磁性体コアの四面に巻き付けられて、前記切り開き線部分で前記コイル導体が接合されたものとする。 The coil conductor has a shape formed by cutting a helical coil formed on a flexible substrate by a predetermined slit line, and the flexible substrate is wound around four surfaces of the magnetic core, and the slit line portion And the coil conductor is joined.

また、前記コイル導体はフレキシブル基板に形成されたスパイラル状の導体であり、前記フレキシブル基板は前記磁性体コアの三面に巻き付けられたものとする。
また、前記コイル導体はフレキシブル基板に形成されたスパイラル状の導体であり、前記フレキシブル基板は前記コイル導体の形成位置の中心に貫通孔を備え、前記磁性体コアは前記貫通孔に挿入されたものとする。
また、前記第１の導体部分と前記第２の導体部分との間をつなぐコイル導体の最も狭い部分の幅をＷ、前記平面導体の前記縁端部に対して直角方向の前記磁性体コアの長さをＹとしたとき、Ｗ≧Ｙの関係に定める。 The coil conductor is a spiral conductor formed on a flexible substrate, and the flexible substrate is wound around three surfaces of the magnetic core.
The coil conductor is a spiral conductor formed on a flexible substrate, the flexible substrate has a through hole at the center of the coil conductor forming position, and the magnetic core is inserted into the through hole. And
The width of the narrowest portion of the coil conductor connecting between the first conductor portion and the second conductor portion is W, and the width of the magnetic core perpendicular to the edge of the planar conductor is W. When the length is Y, the relationship is W ≧ Y.

また、前記磁性体コアは磁束の出入りする端部が他の部分より太いものとする。
また、前記平面導体の前記縁端部に近い側の前記アンテナの端部から前記平面導体の前記縁端部までの距離をＸ、前記平面導体の前記縁端部に対して直角方向の前記アンテナコイルの長さをＹとしたとき、Ｙ＞Ｘの関係に定める。
また、前記平面導体は前記アンテナコイルが実装される回路基板で構成されている。 Further, the magnetic core is assumed to have thicker end portions where magnetic flux enters and exits than other portions.
Further, the distance from the end of the antenna closer to the edge end portion of the flat conductor to the edge end portion of the planar conductor X, the direction perpendicular to the antenna with respect to the edge end portion of the planar conductor When the length of the coil is Y, the relationship is defined as Y> X.
Further, the planar conductor that consists of a circuit board on which the antenna coil is mounted.

この発明によれば、通信可能最長距離を長くでき、しかも通信可能距離が最も長くなる位置を筐体のほぼ中心にできる。   According to the present invention, the longest communicable distance can be lengthened, and the position where the communicable distance is longest can be set substantially at the center of the casing.

特許文献１に記載されるアンテナ装置の構造を示す正面図である。It is a front view which shows the structure of the antenna apparatus described in patent document 1. 第１の実施形態に係る磁性体アンテナ及びアンテナ装置の構成を示す図である。It is a figure which shows the structure of the magnetic body antenna and antenna apparatus which concern on 1st Embodiment. 図３（Ａ）は前記アンテナ１０１の磁束の分布及び指向性を表す図、図３（Ｂ）は、第１の実施形態に係るアンテナと対比するために示す従来構造のアンテナの磁束の分布及び指向性を示す図である。FIG. 3A is a diagram showing the magnetic flux distribution and directivity of the antenna 101, and FIG. 3B is a magnetic flux distribution of a conventional structure shown for comparison with the antenna according to the first embodiment. It is a figure which shows directivity. 第１の実施形態に係るアンテナ１０１を備えた携帯電話端末等の電子機器とＲＦＩＤ用のＩＣカードとの間で通信を行う状態を示す図である。It is a figure which shows the state which communicates between electronic devices, such as a mobile telephone terminal provided with the antenna 101 which concerns on 1st Embodiment, and IC card for RFID. 第１の実施形態に係るアンテナ１０１を収納する電子機器の筐体の中心とリーダライタ側アンテナの中心とのずれに対する通信可能最長距離との関係を示す図である。It is a figure which shows the relationship between the longest communicable distance with respect to the shift | offset | difference of the center of the housing | casing of the electronic device which accommodates the antenna 101 which concerns on 1st Embodiment, and the center of the reader-writer side antenna. 平面導体２とアンテナコイル２１との位置関係について示す図である。FIG. 3 is a diagram showing a positional relationship between a planar conductor 2 and an antenna coil 21. 図７（Ａ）は、平面導体２とアンテナコイル２１との位置関係について示す平面図である。図７（Ｂ）は、第１の実施形態に係るアンテナコイル２１と、従来構造のアンテナコイル２０について、距離Ｘと結合係数との関係を示す図である。FIG. 7A is a plan view showing the positional relationship between the planar conductor 2 and the antenna coil 21. FIG. 7B is a diagram illustrating the relationship between the distance X and the coupling coefficient for the antenna coil 21 according to the first embodiment and the antenna coil 20 having the conventional structure. 図８（Ａ）は第２の実施形態に係るアンテナコイル２２の組み立て前の状態を示す図、図８（Ｂ）はそのアンテナコイル２２の平面図である。FIG. 8A is a diagram showing a state before the assembly of the antenna coil 22 according to the second embodiment, and FIG. 8B is a plan view of the antenna coil 22. 図９（Ａ）は第２の実施形態に係るアンテナコイル２２を備えたアンテナ１０２の下面図、図９（Ｂ）はその正面図である。図９（Ｃ）は、回路基板である平面導体２を収納する筐体２０２の内側にアンテナコイル２２を固定した例である。FIG. 9A is a bottom view of the antenna 102 provided with the antenna coil 22 according to the second embodiment, and FIG. 9B is a front view thereof. FIG. 9C shows an example in which the antenna coil 22 is fixed inside the housing 202 that houses the planar conductor 2 that is a circuit board. 図１０（Ａ）は第３の実施形態に係るアンテナコイル２３の組み立て前の平面図、図１０（Ｂ）はそのアンテナコイル２３の平面図である。FIG. 10A is a plan view of the antenna coil 23 according to the third embodiment before assembly, and FIG. 10B is a plan view of the antenna coil 23. 図１１（Ａ）は第３の実施形態に係るアンテナコイル２３を備えたアンテナ１０３の下面図、図１１（Ｂ）はその正面図である。図１１（Ｃ）は、回路基板である平面導体２を収納する筐体２０３の内側にアンテナコイル２３を固定した例である。FIG. 11A is a bottom view of the antenna 103 provided with the antenna coil 23 according to the third embodiment, and FIG. 11B is a front view thereof. FIG. 11C shows an example in which the antenna coil 23 is fixed inside the housing 203 that houses the planar conductor 2 that is a circuit board. 第１の導体部分１１と第２の導体部分１２との間をつなぐコイル導体の最も狭い部分の幅をＷ、平面導体の一辺に対して直角方向の磁性体コアの長さをＹとしたとき、ＷとＹとの積を一定にしてＷを変化させたときの、Ｗと結合係数との関係を示す図である。When the width of the narrowest portion of the coil conductor connecting the first conductor portion 11 and the second conductor portion 12 is W, and the length of the magnetic core perpendicular to one side of the planar conductor is Y FIG. 6 is a diagram illustrating a relationship between W and a coupling coefficient when W is changed with a product of W and Y being constant. 図１３（Ａ）は第４の実施形態に係るアンテナコイル２４Ａの組み立て前の平面図、図１３（Ｂ）はそのアンテナコイル２４Ａの平面図である。FIG. 13A is a plan view before assembly of the antenna coil 24A according to the fourth embodiment, and FIG. 13B is a plan view of the antenna coil 24A. 図１４（Ａ）は第４の実施形態に係る別のアンテナコイル２４Ｂの組み立て前の平面図、図１４（Ｂ）はそのアンテナコイル２４Ｂの平面図である。FIG. 14A is a plan view before assembling another antenna coil 24B according to the fourth embodiment, and FIG. 14B is a plan view of the antenna coil 24B. 図１５（Ａ）は第４の実施形態に係る別のアンテナコイル２４Ｃの組み立て前の平面図、図１５（Ｂ）はそのアンテナコイル２４Ｃの平面図である。FIG. 15A is a plan view before assembling another antenna coil 24C according to the fourth embodiment, and FIG. 15B is a plan view of the antenna coil 24C. 図１６（Ａ）は第５の実施形態に係るアンテナコイル２５の組み立て前の平面図、図１６（Ｂ）はそのアンテナコイル２５の上面図、図１６（Ｃ）はアンテナコイル２５の下面図である。16A is a plan view before assembly of the antenna coil 25 according to the fifth embodiment, FIG. 16B is a top view of the antenna coil 25, and FIG. 16C is a bottom view of the antenna coil 25. is there. 図１７（Ａ）は第５の実施形態に係るアンテナコイル２５を備えたアンテナ１０４の下面図、図１７（Ｂ）はその正面図である。図１７（Ｃ）は、回路基板である平面導体２を収納する筐体２０４の内側にアンテナコイル２５を固定した例である。FIG. 17A is a bottom view of the antenna 104 provided with the antenna coil 25 according to the fifth embodiment, and FIG. 17B is a front view thereof. FIG. 17C shows an example in which the antenna coil 25 is fixed inside the housing 204 that houses the planar conductor 2 that is a circuit board. 図１８（Ａ）は、第６の実施形態に係るアンテナコイル２６Ａの組み立て前の平面図、図１８（Ｂ）はそのアンテナコイル２６Ａの平面図である。FIG. 18A is a plan view of the antenna coil 26A according to the sixth embodiment before assembly, and FIG. 18B is a plan view of the antenna coil 26A. 図１９（Ａ）は、第６の実施形態に係る別のアンテナコイル２６Ｂの組み立て前の平面図、図１９（Ｂ）はそのアンテナコイル２６Ｂの平面図である。FIG. 19A is a plan view before assembling another antenna coil 26B according to the sixth embodiment, and FIG. 19B is a plan view of the antenna coil 26B. 図２０（Ａ）は、第６の実施形態に係る別のアンテナコイル２６Ｃの組み立て前の平面図、図２０（Ｂ）はそのアンテナコイル２６Ｃの平面図であるFIG. 20A is a plan view before assembling another antenna coil 26C according to the sixth embodiment, and FIG. 20B is a plan view of the antenna coil 26C.

《第１の実施形態》
図２は第１の実施形態に係るアンテナの構成を示す図である。
図２（Ａ）は、アンテナコイル２１と、それを実装する回路基板などの矩形板状の平面導体２とを備えるアンテナ１０１の斜視図である。図２（Ｂ）は、前記アンテナ１０１の正面図である。 << First Embodiment >>
FIG. 2 is a diagram illustrating the configuration of the antenna according to the first embodiment.
FIG. 2A is a perspective view of an antenna 101 including an antenna coil 21 and a planar conductor 2 having a rectangular plate shape such as a circuit board on which the antenna coil 21 is mounted. FIG. 2B is a front view of the antenna 101.

磁性体コア１は矩形板形状のフェライトコアであり、図２における下面が第１主面ＭＳ１、上面が第２主面ＭＳ２である。この磁性体コア１には図２に示すようにコイル導体ＣＷが巻回されている。図中の符号１１で示す部分はコイル導体ＣＷのうち、磁性体コア１の第１主面ＭＳ１に近接する第１の導体部分である。また、図中符号１２で示す部分は磁性体コア１の第２主面ＭＳ２に近接する第２の導体部分である。前記磁性体コア１とコイル導体ＣＷとによってアンテナコイル２１が構成されている。   The magnetic core 1 is a rectangular plate-shaped ferrite core, and the lower surface in FIG. 2 is the first main surface MS1 and the upper surface is the second main surface MS2. A coil conductor CW is wound around the magnetic core 1 as shown in FIG. A portion indicated by reference numeral 11 in the drawing is a first conductor portion of the coil conductor CW that is close to the first main surface MS1 of the magnetic core 1. Moreover, the part shown with the code | symbol 12 in a figure is a 2nd conductor part which adjoins 2nd main surface MS2 of the magnetic body core 1. FIG. An antenna coil 21 is constituted by the magnetic core 1 and the coil conductor CW.

前記アンテナコイル２１は平面導体２の中心より所定の一辺（図２における右側の辺）Ｓ寄りに配置されている。また、第１の導体部分１１と第２の導体部分１２とは、磁性体コア１の第１主面ＭＳ１または第２主面ＭＳ２の法線方向から見て（透視して）重ならないように配置されている。そして、第２の導体部分１２は第１の導体部分１１に比べて平面導体２の中心より遠い位置関係にそれらが配置されている。さらに、コイル導体ＣＷのコイル軸ＣＡは平面導体２の前記一辺Ｓに対して垂直である。   The antenna coil 21 is disposed closer to a predetermined side (right side in FIG. 2) S than the center of the planar conductor 2. In addition, the first conductor portion 11 and the second conductor portion 12 do not overlap each other when viewed from the normal direction of the first main surface MS1 or the second main surface MS2 of the magnetic core 1 (see through). Has been placed. The second conductor portion 12 is disposed in a positional relationship farther from the center of the planar conductor 2 than the first conductor portion 11. Further, the coil axis CA of the coil conductor CW is perpendicular to the one side S of the planar conductor 2.

図３（Ａ）は前記アンテナ１０１の磁束の分布及び指向性を表す図である。また図３（Ｂ）は、第１の実施形態に係るアンテナと対比するために示す従来構造のアンテナの磁束の分布及び指向性を示す図である。前記アンテナ１０１は、そのアンテナコイル２１が平面導体２よりリーダライタ側アンテナ３０１に近接する位置関係に配置される。この状態は、前記アンテナ１０１が内蔵された電子機器をリーダライタの読取部にかざす状態である。   FIG. 3A is a diagram illustrating the magnetic flux distribution and directivity of the antenna 101. FIG. 3B is a diagram showing the magnetic flux distribution and directivity of the antenna having the conventional structure shown for comparison with the antenna according to the first embodiment. The antenna 101 is arranged in such a positional relationship that the antenna coil 21 is closer to the reader / writer side antenna 301 than the planar conductor 2. This state is a state in which the electronic device incorporating the antenna 101 is held over the reading unit of the reader / writer.

前記コイル導体ＣＷのうち、第２の導体部分１２が第１の導体部分１１に比べて平面導体２の中心より外側に位置しているので、アンテナコイル２１の磁性体コアを通過する磁束Ｈのループの長軸は図に示すように平面導体２の面に対して傾く。すなわち、平面導体２の法線方向（Ｚ軸方向）の成分が強くなる。これに伴いアンテナ１０１の指向性ビームＤＢはリーダライタ側アンテナ３０１の中心方向を向くことになる。   Of the coil conductor CW, the second conductor portion 12 is located outside the center of the planar conductor 2 as compared to the first conductor portion 11, so that the magnetic flux H that passes through the magnetic core of the antenna coil 21 is reduced. The major axis of the loop is inclined with respect to the plane conductor 2 as shown in the figure. That is, the component in the normal direction (Z-axis direction) of the planar conductor 2 becomes strong. Accordingly, the directional beam DB of the antenna 101 is directed toward the center of the reader / writer side antenna 301.

一方、図３（Ｂ）に示すように、磁性体コアの第１主面と第２主面にそれぞれ近接する第１の導体部分と第２の導体部分が表裏面で重なる位置関係にある従来のアンテナコイル２０では、その磁性体コアを通過する磁束Ｈのループの長軸は平面導体２と平行となり、アンテナの指向性ビームＤＢは平面導体２の面に沿った方向に向く。そのため、リーダライタ側アンテナ３０１に対してアンテナ１００を平行に近接させると通信可能最長距離が短くなり、寧ろ、リーダライタ側アンテナ３０１に対してアンテナ１００を傾けて近接させる方が通信可能な最長距離が延びることになる。   On the other hand, as shown in FIG. 3B, the first conductor portion and the second conductor portion that are respectively close to the first main surface and the second main surface of the magnetic core have a positional relationship in which the front and back surfaces overlap each other. In the antenna coil 20, the major axis of the loop of the magnetic flux H passing through the magnetic core is parallel to the planar conductor 2, and the directional beam DB of the antenna is directed in the direction along the plane of the planar conductor 2. Therefore, when the antenna 100 is brought close to the reader / writer side antenna 301 in parallel, the longest communicable distance is shortened. Rather, when the antenna 100 is tilted and made close to the reader / writer side antenna 301, the longest communication distance is possible. Will be extended.

これに対して、第１の実施形態によれば通信可能最長距離を長くでき、しかもアンテナ１０１の中心とリーダライタ側アンテナ３０１の中心とが一致した状態で通信可能最長距離が得られる。   In contrast, according to the first embodiment, the longest communicable distance can be increased, and the longest communicable distance can be obtained in a state where the center of the antenna 101 and the center of the reader / writer side antenna 301 coincide with each other.

次に、ＲＦＩＤ用のＩＣカードと前記アンテナ１０１を備えた携帯電話端末等の電子機器との間で通信を行う例について示す。
図４はＲＦＩＤ用のＩＣカードと前記アンテナ１０１を備えた携帯電話端末等の電子機器との配置関係を示す図である。平面導体２の端部にアンテナコイル２１が配置されることによって構成されたアンテナが電子機器の筐体２０１に収められている。図４（Ａ）は、その電子機器とＩＣカード４０１とを同じ縦方向にして近接させた状態、図４（Ｂ）は両者を直交状態に配置した状態である。ＩＣカード４０１の内部には、その外周に沿って複数ターンのアンテナコイルが形成されていて、アンテナコイル２１と磁気的に結合する。 Next, an example in which communication is performed between an RFID IC card and an electronic device such as a mobile phone terminal including the antenna 101 will be described.
FIG. 4 is a diagram showing an arrangement relationship between an RFID IC card and an electronic device such as a mobile phone terminal provided with the antenna 101. An antenna configured by arranging the antenna coil 21 at the end of the planar conductor 2 is housed in a casing 201 of the electronic device. 4A shows a state in which the electronic device and the IC card 401 are brought close to each other in the same vertical direction, and FIG. 4B shows a state in which the two are arranged in an orthogonal state. Inside the IC card 401, an antenna coil having a plurality of turns is formed along the outer periphery thereof and is magnetically coupled to the antenna coil 21.

このように、平面導体２の端部にアンテナコイル２１を配置したことにより、平面導体２とほぼ同一サイズのＩＣカードを近接させた時、ＩＣカード４０１のアンテナコイルとこの実施形態に係るアンテナのアンテナコイル２１とのコイル導体同士の距離が近接するので、アンテナ間の強い結合が得られる。   As described above, by arranging the antenna coil 21 at the end of the planar conductor 2, when the IC card having substantially the same size as the planar conductor 2 is brought close to the antenna coil of the IC card 401 and the antenna according to this embodiment. Since the distance between the coil conductors with the antenna coil 21 is close, strong coupling between the antennas can be obtained.

このように、例えば１００ｍｍ程度離れたリーダライタとの間での通信だけでなく、ＩＣカードとほぼ接した状態で通信を行う場合にも適応できる。   As described above, for example, the present invention can be applied not only to communication with a reader / writer separated by about 100 mm but also to communication in a state of being substantially in contact with the IC card.

すなわち、本発明のアンテナは、平面導体の端部にアンテナコイルを配置した時にも良好な通信性能が得られるようなコイル導体の巻き方になっている。磁性体コアの周囲に単にコイル導体を巻回しただけの従来構造のアンテナコイルを用いたアンテナと比較して、通信に寄与する磁界強度が強く、高い通信性能（通信可能距離や通信データの誤り率等に関する性能）が得られる。   In other words, the antenna of the present invention is wound in such a manner that a good communication performance can be obtained even when an antenna coil is arranged at the end of the planar conductor. Compared to an antenna using a conventional antenna coil in which a coil conductor is simply wound around a magnetic core, the magnetic field strength that contributes to communication is strong, and high communication performance (communication distance and communication data errors) Performance with respect to rate, etc.).

図５は、第１の実施形態に係るアンテナ１０１を収納する電子機器の筐体の中心とリーダライタ側アンテナの中心とのずれに対する通信可能最長距離の関係を示す図である。ここで、リーダライタ側アンテナの中心と電子機器の筐体の中心とを合わせた位置を原点とし、リーダライタ側アンテナの中心に対する電子機器の筐体の中心のずれ量を横軸にとっている。   FIG. 5 is a diagram illustrating the relationship of the longest communicable distance with respect to the deviation between the center of the casing of the electronic device that houses the antenna 101 according to the first embodiment and the center of the reader / writer side antenna. Here, the origin is the position where the center of the reader / writer side antenna and the center of the electronic device casing are aligned, and the horizontal axis represents the amount of deviation of the center of the electronic device casing from the center of the reader / writer side antenna.

リーダライタ側アンテナのループの寸法は約６５×１００ｍｍ、電子機器の筐体寸法は約４５×９０ｍｍ、アンテナコイル２１の寸法は約２０×１５ｍｍである。
このように、リーダライタ側アンテナの中心と電子機器の筐体の中心を合わせた時に通信可能な最長距離が最も長くなることが分かる。 The loop size of the reader / writer side antenna is about 65 × 100 mm, the housing size of the electronic device is about 45 × 90 mm, and the size of the antenna coil 21 is about 20 × 15 mm.
As described above, it can be seen that the longest communicable distance becomes the longest when the center of the reader / writer side antenna is aligned with the center of the housing of the electronic device.

図６は平面導体２とアンテナコイル２１との位置関係について示す図である。ここで、平面導体２の一辺Ｓに近い側のアンテナコイル２１の端部から前記一辺Ｓまでの距離をＸ、平面導体２の一辺Ｓに対して直角方向のアンテナコイル２１の長さをＹとすると、
Ｙ＞Ｘ
の関係とする。 FIG. 6 is a diagram showing the positional relationship between the planar conductor 2 and the antenna coil 21. Here, the distance from the end of the antenna coil 21 near the one side S of the planar conductor 2 to the one side S is X, and the length of the antenna coil 21 perpendicular to the one side S of the planar conductor 2 is Y. Then
Y> X
The relationship.

前記ＸとＹの関係について、図７を参照して接続する。
図７（Ａ）は、平面導体２とアンテナコイル２１との位置関係について示す平面図である。この例では、平面導体２は４２ｍｍ×９０ｍｍ、アンテナコイル２１は２０ｍｍ×１５ｍｍとしている。図７（Ｂ）は、第１の実施形態に係るアンテナコイル２１と、従来構造のアンテナコイルについて、前記距離Ｘと結合係数との関係を示す図である。ここで、比較例である従来構造のアンテナコイルは、磁性体コアの第１主面と第２主面にそれぞれ近接する第１の導体部分と第２の導体部分が表裏面で重なる位置関係にある。また、リーダライタのアンテナは１００×１００ｍｍとし、そのアンテナと３０ｍｍの距離で対向させた。 The relationship between X and Y is connected with reference to FIG.
FIG. 7A is a plan view showing the positional relationship between the planar conductor 2 and the antenna coil 21. In this example, the planar conductor 2 is 42 mm × 90 mm, and the antenna coil 21 is 20 mm × 15 mm. FIG. 7B is a diagram showing the relationship between the distance X and the coupling coefficient for the antenna coil 21 according to the first embodiment and the antenna coil having the conventional structure. Here, the antenna coil having a conventional structure as a comparative example has a positional relationship in which the first conductor portion and the second conductor portion that are close to the first main surface and the second main surface of the magnetic core overlap on the front and back surfaces, respectively. is there. The reader / writer antenna was 100 × 100 mm, and was opposed to the antenna at a distance of 30 mm.

図７（Ｂ）に表れているように、Ｘ＜１５ｍｍのときに、アンテナコイル２１の結合係数が従来構造のアンテナコイルより大きくなっている。今、Ｙ＝１５であるので、Ｙ＞Ｘの関係とすることによって、従来構造のアンテナコイルに比べて高い結合係数が得られることがわかる。   As shown in FIG. 7B, when X <15 mm, the coupling coefficient of the antenna coil 21 is larger than that of the antenna coil having the conventional structure. Now, since Y = 15, it can be seen that a high coupling coefficient can be obtained by using the relationship of Y> X as compared with the antenna coil having the conventional structure.

なお、図７（Ｂ）にも表れているように、前記寸法Ｘはマイナスの値であってもよい。すなわち図６（Ｂ）のように、アンテナコイル２１の端部が平面導体２の一辺Ｓより外側にあってもよい。
このような関係とすることにより、図３（Ａ）に示した指向性ビームＤＢの向きを立ち上げることができ、本発明の目的を達することができる。 As shown in FIG. 7B, the dimension X may be a negative value. That is, as shown in FIG. 6B, the end of the antenna coil 21 may be outside the one side S of the planar conductor 2.
With such a relationship, the direction of the directional beam DB shown in FIG. 3A can be raised, and the object of the present invention can be achieved.

《第２の実施形態》
図８（Ａ）は第２の実施形態に係るアンテナコイル２２の組み立て前の状態を示す図、図８（Ｂ）はそのアンテナコイル２２の平面図である。図８（Ａ）に示すように、フレキシブル基板１０にコイル導体ＣＷが形成されている。このコイル導体ＣＷは、ヘリカル状のコイルが所定の切り開き線で切り開かれた状態の導体パターンである。フレキシブル基板１０は磁性体コア１の四面に巻き付けられて、前記切り開き線部分でコイル導体ＣＷの端部同士が接合される。この例では、端部ａ−ａ′，ｂ−ｂ′，ｃ−ｃ′が半田等により接合される。これにより、図８（Ｂ）に示すアンテナコイル２２が構成される。 << Second Embodiment >>
FIG. 8A is a diagram showing a state before the assembly of the antenna coil 22 according to the second embodiment, and FIG. 8B is a plan view of the antenna coil 22. As shown in FIG. 8A, a coil conductor CW is formed on the flexible substrate 10. The coil conductor CW is a conductor pattern in which a helical coil is cut along a predetermined slit line. The flexible substrate 10 is wound around the four surfaces of the magnetic core 1 and the ends of the coil conductor CW are joined to each other at the cut line portion. In this example, the end portions aa ′, bb ′, and cc ′ are joined by solder or the like. Thereby, the antenna coil 22 shown in FIG.

図８（Ｂ）に示す向きで、第２の導体部分１２は磁性体コア１の上面（第２主面）に近接し、第１の導体部分１１は磁性体コア１の下面（第１主面）に近接する。   In the orientation shown in FIG. 8B, the second conductor portion 12 is close to the upper surface (second main surface) of the magnetic core 1, and the first conductor portion 11 is the lower surface (first main portion) of the magnetic core 1. Close to the surface).

図９（Ａ）は前記アンテナコイル２２を備えたアンテナ１０２の下面図、図９（Ｂ）はその正面図である。アンテナコイル２２は、回路基板である平面導体２の一辺の中央部に沿った位置に実装される。   9A is a bottom view of the antenna 102 provided with the antenna coil 22, and FIG. 9B is a front view thereof. The antenna coil 22 is mounted at a position along the center of one side of the planar conductor 2 that is a circuit board.

図９（Ｃ）は、回路基板である平面導体２を収納する筐体２０２の内側にアンテナコイル２２を固定した例である。この場合でも、第２の導体部分１２が第１の導体部分１１に比べて平面導体２の中心より遠い位置に配置される。
このようにして第１の実施形態で述べたと同様の作用効果を奏する。 FIG. 9C shows an example in which the antenna coil 22 is fixed inside the housing 202 that houses the planar conductor 2 that is a circuit board. Even in this case, the second conductor portion 12 is disposed farther from the center of the planar conductor 2 than the first conductor portion 11.
Thus, the same operational effects as described in the first embodiment can be obtained.

《第３の実施形態》
図１０（Ａ）は第３の実施形態に係るアンテナコイル２３の組み立て前の平面図、図１０（Ｂ）はそのアンテナコイル２３の平面図である。フレキシブル基板１０にはスパイラル状のコイル導体ＣＷが形成されていて、スパイラル状コイル導体の形成位置の中心に貫通孔Ａを備えている。磁性体コア１はフレキシブル基板１０の貫通孔Ａ部分に挿入されて、図１０（Ｂ）に示されるアンテナコイル２３が構成される。 << Third Embodiment >>
FIG. 10A is a plan view of the antenna coil 23 according to the third embodiment before assembly, and FIG. 10B is a plan view of the antenna coil 23. The flexible substrate 10 is formed with a spiral coil conductor CW, and has a through hole A at the center of the position where the spiral coil conductor is formed. The magnetic core 1 is inserted into the through hole A portion of the flexible substrate 10 to constitute the antenna coil 23 shown in FIG.

図１１（Ａ）は前記アンテナコイル２３を備えたアンテナ１０３の下面図、図１１（Ｂ）はその正面図である。アンテナコイル２３は、回路基板である平面導体２の一辺の中央部に沿った位置に実装される。   FIG. 11A is a bottom view of the antenna 103 provided with the antenna coil 23, and FIG. 11B is a front view thereof. The antenna coil 23 is mounted at a position along the center of one side of the planar conductor 2 that is a circuit board.

図１１（Ｃ）は、図１１（Ａ），図１１（Ｂ）の例とは異なり、回路基板である平面導体２を収納する筐体２０３の内側にアンテナコイル２３を固定した例である。この場合でも、第２の導体部分１２が第１の導体部分１１に比べて平面導体２の中心より遠い位置に配置される。
このようにして第１の実施形態で述べたと同様の作用効果を奏する。 FIG. 11C is an example in which the antenna coil 23 is fixed inside the housing 203 that houses the planar conductor 2 that is a circuit board, unlike the examples of FIGS. 11A and 11B. Even in this case, the second conductor portion 12 is disposed farther from the center of the planar conductor 2 than the first conductor portion 11.
Thus, the same operational effects as described in the first embodiment can be obtained.

図１０（Ｂ）に示したように、第１の導体部分１１と第２の導体部分１２との間をつなぐコイル導体の最も狭い部分の幅をＷ、前記平面導体の前記一辺に対して直角方向の前記磁性体コアの長さをＹとしたとき、ＷとＹとの関係について、図１２を参照して接続する。
図１２は、ＷとＹとの積を１５×１５＝２２５ｍｍ2 で一定にし、Ｗを変化させたときの、Ｗと結合係数との関係を示す図である。この例では、リーダライタのアンテナは１００×１００ｍｍとし、そのアンテナと３０ｍｍの距離で対向させた。 As shown in FIG. 10B, the width of the narrowest portion of the coil conductor that connects between the first conductor portion 11 and the second conductor portion 12 is W, and the width is perpendicular to the one side of the planar conductor. When the length of the magnetic core in the direction is Y, the relationship between W and Y is connected with reference to FIG.
FIG. 12 is a diagram showing the relationship between W and the coupling coefficient when the product of W and Y is fixed at 15 × 15 = 225 mm 2 and W is changed. In this example, the reader / writer antenna is 100 × 100 mm, and is opposed to the antenna at a distance of 30 mm.

Ｗ＜Ｙのとき（Ｗ＜１５ｍｍのとき）は、Ｗが小さくなるほど結合係数が小さくなり、通信性能が悪化する。したがって、Ｗ≧Ｙの関係とすることによって、良好な通信性能が確保できる。
《第４の実施形態》
図１３〜図１５は第４の実施形態に係るアンテナコイル２４Ａ，２４Ｂ，２４Ｃのそれぞれの構成を示す図である。図１３（Ａ）はアンテナコイル２４Ａの組み立て前の平面図、図１３（Ｂ）はそのアンテナコイル２４Ａの平面図である。図１４（Ａ）はアンテナコイル２４Ｂの組み立て前の平面図、図１４（Ｂ）はそのアンテナコイル２４Ｂの平面図である。同様に、図１５（Ａ）はアンテナコイル２４Ｃの組み立て前の平面図、図１５（Ｂ）はそのアンテナコイル２４Ｃの平面図である。 When W <Y (when W <15 mm), the smaller the W is, the smaller the coupling coefficient is, and the communication performance deteriorates. Therefore, good communication performance can be ensured by making the relationship W ≧ Y.
<< Fourth Embodiment >>
FIG. 13 to FIG. 15 are diagrams showing the configurations of the antenna coils 24A, 24B, and 24C according to the fourth embodiment. FIG. 13A is a plan view of the antenna coil 24A before assembly, and FIG. 13B is a plan view of the antenna coil 24A. FIG. 14A is a plan view of the antenna coil 24B before assembly, and FIG. 14B is a plan view of the antenna coil 24B. Similarly, FIG. 15A is a plan view before assembly of the antenna coil 24C, and FIG. 15B is a plan view of the antenna coil 24C.

図１０に示したアンテナコイル２３と異なるのは磁性体コア１の磁束の出入りする端部が他の部分より太く形成されていることである。図１３に示すアンテナコイル２４Ａでは磁性体コア１は、その一方の端部が全体に広く（太く）形成されている。図１４のアンテナコイル２４Ｂでは磁性体コア１の一方の端部が台形状に広がっている。図１５のアンテナコイル２４Ｃの例では、磁性体コア１は、その中央より両端部にかけて幅が広くなる形状である。   What is different from the antenna coil 23 shown in FIG. 10 is that the end portion of the magnetic core 1 where the magnetic flux enters and exits is formed thicker than the other portions. In the antenna coil 24 </ b> A shown in FIG. 13, one end of the magnetic core 1 is formed wide (thicker) as a whole. In the antenna coil 24B of FIG. 14, one end portion of the magnetic core 1 spreads in a trapezoidal shape. In the example of the antenna coil 24 </ b> C in FIG. 15, the magnetic core 1 has a shape that becomes wider from the center to both ends.

このような形状の磁性体コア１を用いることにより、磁性体コア１を通る磁束が大きくなり、通信相手のアンテナとの磁界結合を強めることができ、通信可能最長距離が長くなるなど、通信性能が向上する。   By using the magnetic core 1 having such a shape, the magnetic flux passing through the magnetic core 1 is increased, the magnetic field coupling with the antenna of the communication partner can be increased, and the maximum communicable distance is increased. Will improve.

《第５の実施形態》
図１６（Ａ）は第５の実施形態に係るアンテナコイル２５の組み立て前の平面図、図１６（Ｂ）はそのアンテナコイル２５の上面図、図１６（Ｃ）はアンテナコイル２５の下面図である。フレキシブル基板１０には図中破線で示す位置を折り目として折り曲げられて磁性体コア１が挟み込まれる（三面に巻き付けられる）ようになるが、フレキシブル基板１０には、前記折り目からずれた位置を中心としてスパイラル状のコイル導体ＣＷが形成されている。そして、コイル導体ＣＷのうち、前記折り目から遠い側が第２の導体部分１２として用いられ、近い側が第１の導体部分１１として用いられる。 << Fifth Embodiment >>
16A is a plan view before assembly of the antenna coil 25 according to the fifth embodiment, FIG. 16B is a top view of the antenna coil 25, and FIG. 16C is a bottom view of the antenna coil 25. is there. The flexible substrate 10 is bent at a position indicated by a broken line in the drawing so that the magnetic core 1 is sandwiched (wound around three surfaces). However, the flexible substrate 10 has a position shifted from the fold as a center. A spiral coil conductor CW is formed. And among coil conductor CW, the side far from the said fold is used as the 2nd conductor part 12, and the near side is used as the 1st conductor part 11. FIG.

図１７（Ａ）は前記アンテナコイル２５を備えたアンテナ１０４の下面図、図１７（Ｂ）はその正面図である。アンテナコイル２５は、回路基板である平面導体２の一辺の中央部に沿った位置に実装される。   FIG. 17A is a bottom view of the antenna 104 provided with the antenna coil 25, and FIG. 17B is a front view thereof. The antenna coil 25 is mounted at a position along the center of one side of the planar conductor 2 that is a circuit board.

図１７（Ｃ）は図１７（Ａ），図１７（Ｂ）の例とは異なり、アンテナコイル２５を、回路基板である平面導体２を収納する筐体２０４の内側に固定した例である。この場合でも、第２の導体部分１２が第１の導体部分１１に比べて平面導体２の中心より遠い位置に配置される。
このようにして第１の実施形態で述べたと同様の作用効果を奏する。 FIG. 17C is an example in which the antenna coil 25 is fixed inside the housing 204 that houses the planar conductor 2 that is a circuit board, unlike the examples of FIGS. 17A and 17B. Even in this case, the second conductor portion 12 is disposed farther from the center of the planar conductor 2 than the first conductor portion 11.
Thus, the same operational effects as described in the first embodiment can be obtained.

《第６の実施形態》
図１８〜図２０は第６の実施形態に係るアンテナコイル２６Ａ，２６Ｂ，２６Ｃのそれぞれの構成を示す図である。図１８（Ａ）はアンテナコイル２６Ａの組み立て前の平面図、図１８（Ｂ）はそのアンテナコイル２６Ａの平面図である。図１９（Ａ）はアンテナコイル２６Ｂの組み立て前の平面図、図１９（Ｂ）はそのアンテナコイル２６Ｂの平面図である。同様に、図２０（Ａ）はアンテナコイル２６Ｃの組み立て前の平面図、図２０（Ｂ）はそのアンテナコイル２６Ｃの平面図である。 << Sixth Embodiment >>
18 to 20 are diagrams showing the configurations of the antenna coils 26A, 26B, and 26C according to the sixth embodiment. 18A is a plan view of the antenna coil 26A before assembly, and FIG. 18B is a plan view of the antenna coil 26A. FIG. 19A is a plan view of the antenna coil 26B before assembly, and FIG. 19B is a plan view of the antenna coil 26B. Similarly, FIG. 20A is a plan view before the antenna coil 26C is assembled, and FIG. 20B is a plan view of the antenna coil 26C.

図１６に示したアンテナコイル２５と異なるのは磁性体コア１の磁束の出入りする端部が他の部分より太く形成されていることである。図１８に示すアンテナコイル２６Ａでは磁性体コア１は、その一方の端部が全体に広く（太く）形成されている。図１９のアンテナコイル２６Ｂでは磁性体コア１の一方の端部が台形状に広がっている。図２０のアンテナコイル２６Ｃの例では、磁性体コア１は、その中央より両端部にかけて幅が広くなる形状である。   A difference from the antenna coil 25 shown in FIG. 16 is that the end portion of the magnetic core 1 where the magnetic flux enters and exits is formed thicker than the other portions. In the antenna coil 26 </ b> A shown in FIG. 18, one end of the magnetic core 1 is formed wide (thicker) as a whole. In the antenna coil 26B of FIG. 19, one end of the magnetic core 1 is spread in a trapezoidal shape. In the example of the antenna coil 26 </ b> C in FIG. 20, the magnetic core 1 has a shape that becomes wider from the center to both ends.

このような形状の磁性体コア１を用いることにより、磁性体コア１を通る磁束が大きくなり、通信相手のアンテナとの磁界結合を強めることができ、通信可能最長距離が長くなるなど、通信性能が向上する。   By using the magnetic core 1 having such a shape, the magnetic flux passing through the magnetic core 1 is increased, the magnetic field coupling with the antenna of the communication partner can be increased, and the maximum communicable distance is increased. Will improve.

Ａ…貫通孔
ＣＡ…コイル軸
ＣＷ…コイル導体
ＤＢ…指向性ビーム
Ｈ…磁束
ＭＳ１…第１主面
ＭＳ２…第２主面
Ｓ…一辺
１…磁性体コア
２…平面導体
１０…フレキシブル基板
１１…第１の導体部分
１２…第２の導体部分
２１〜２３…アンテナコイル
２４Ａ，２４Ｂ，２４Ｃ…アンテナコイル
２５…アンテナコイル
２６Ａ，２６Ｂ，２６Ｃ…アンテナコイル
１００〜１０４…アンテナ
２０１〜２０４…筐体
３０１…リーダライタ側アンテナ
４０１…ＩＣカード A ... Through hole CA ... Coil axis CW ... Coil conductor DB ... Directional beam H ... Magnetic flux MS1 ... First main surface MS2 ... Second main surface S ... One side 1 ... Magnetic core 2 ... Planar conductor 10 ... Flexible substrate 11 ... 1st conductor part 12 ... 2nd conductor part 21-23 ... Antenna coil 24A, 24B, 24C ... Antenna coil 25 ... Antenna coil 26A, 26B, 26C ... Antenna coil 100-104 ... Antenna 201-204 ... Case 301 ... Reader / writer side antenna 401 ... IC card

Claims (8)

第１主面及び第２主面を有する板状の磁性体コアと、この磁性体コアに巻回されたコイル導体と、を備えたアンテナコイルが平面導体に近接配置されたアンテナにおいて、
前記平面導体の外形は、前記アンテナコイルの平面外形よりも大きく、
前記磁性体コアの第１主面は前記平面導体に対面し、
前記アンテナコイルは前記平面導体の縁端部寄りに配置され、
前記コイル導体のうち、前記磁性体コアの第１主面に近接する第１の導体部分と、前記磁性体コアの第２主面に近接する第２の導体部分とは、前記磁性体コアの第１主面または第２主面の法線方向から見て重ならない位置にあり、
第２の導体部分は第１の導体部分に比べて前記平面導体の前記縁端部側となる位置に配置され、
前記コイル導体のコイル軸は前記平面導体の前記縁端部側を向いている、アンテナ。 In an antenna in which an antenna coil including a plate-like magnetic core having a first main surface and a second main surface and a coil conductor wound around the magnetic core is disposed close to a planar conductor,
The outer shape of the planar conductor is larger than the planar outer shape of the antenna coil,
The first main surface of the magnetic core faces the planar conductor,
The antenna coil is disposed near the edge of the planar conductor;
Among the coil conductors, a first conductor portion that is close to the first main surface of the magnetic core and a second conductor portion that is close to the second main surface of the magnetic core are: Located in a position that does not overlap when viewed from the normal direction of the first main surface or the second main surface,
The second conductor portion is disposed at a position on the edge side of the planar conductor as compared to the first conductor portion,
The antenna, wherein the coil axis of the coil conductor faces the edge side of the planar conductor. 前記コイル導体は、フレキシブル基板に形成された、ヘリカル状のコイルが所定の切り開き線で切り開かれた形状の導体パターンで構成され、前記フレキシブル基板が前記磁性体コアの四面に巻き付けられて、前記切り開き線部分で前記導体パターン同士が接合された、請求項１に記載のアンテナ。   The coil conductor is formed of a conductive pattern in which a helical coil formed on a flexible substrate is cut by a predetermined slit line, and the flexible substrate is wound around four surfaces of the magnetic core, so that the slit is opened. The antenna according to claim 1, wherein the conductor patterns are joined at a line portion. 前記コイル導体はフレキシブル基板に形成されたスパイラル状の導体であり、前記フレキシブル基板は前記磁性体コアの三面に巻き付けられた、請求項１に記載のアンテナ。   The antenna according to claim 1, wherein the coil conductor is a spiral conductor formed on a flexible substrate, and the flexible substrate is wound around three surfaces of the magnetic core. 前記コイル導体はフレキシブル基板に形成されたスパイラル状の導体であり、前記フレキシブル基板は前記コイル導体の形成位置の中心に貫通孔を備え、前記磁性体コアは前記貫通孔に挿入された、請求項１に記載のアンテナ。   The coil conductor is a spiral conductor formed on a flexible substrate, the flexible substrate includes a through hole at the center of the formation position of the coil conductor, and the magnetic core is inserted into the through hole. The antenna according to 1. 前記第１の導体部分と前記第２の導体部分との間をつなぐコイル導体の最も狭い部分の幅をＷ、前記平面導体の前記縁端部に対して直角方向の前記磁性体コアの長さをＹとしたとき、Ｗ≧Ｙの関係に定めた、請求項１〜４のいずれかに記載のアンテナ。   The width of the narrowest portion of the coil conductor that connects between the first conductor portion and the second conductor portion is W, and the length of the magnetic core perpendicular to the edge of the planar conductor The antenna according to claim 1, wherein a relationship of W ≧ Y is established, where Y is Y. 前記磁性体コアは磁束の出入りする端部が他の部分より太い、請求項１〜５のいずれかに記載のアンテナ。   The antenna according to claim 1, wherein the magnetic core has a thicker end portion where magnetic flux enters and exits than other portions. 前記平面導体の前記縁端部に近い側の前記アンテナの端部から前記平面導体の前記縁端部までの距離をＸ、前記平面導体の前記縁端部に対して直角方向の前記磁性体コアの長さをＹとしたとき、Ｙ＞Ｘの関係に定めた、請求項１〜６のいずれかに記載のアンテナ。   The distance X from the end of the antenna on the side close to the edge of the planar conductor to the edge of the planar conductor is X, and the magnetic core perpendicular to the edge of the planar conductor is X The antenna according to claim 1, wherein a relationship of Y> X is defined, where Y is a length. 前記平面導体は前記アンテナコイルが実装される回路基板で構成されている、請求項１〜７のいずれかに記載のアンテナ。   The antenna according to claim 1, wherein the planar conductor is configured by a circuit board on which the antenna coil is mounted.
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