JP2013009071A - Antenna coil - Google Patents

Antenna coil Download PDF

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JP2013009071A
JP2013009071A JP2011139166A JP2011139166A JP2013009071A JP 2013009071 A JP2013009071 A JP 2013009071A JP 2011139166 A JP2011139166 A JP 2011139166A JP 2011139166 A JP2011139166 A JP 2011139166A JP 2013009071 A JP2013009071 A JP 2013009071A
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coil
magnetic core
antenna
magnetic flux
loop
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Masayuki Takahashi
政幸 高橋
Masatake Shirai
正剛 白井
Shuichi Yatabe
主一 谷田部
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Toko Inc
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Toko Inc
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Abstract

PROBLEM TO BE SOLVED: To cope with the problem that a distance at which communications can be performed decreases when a thickness of a magnetic body core is decreased so as to make an antenna coil thin, since a coefficient of coupling between a loop antenna and an antenna coil decreases.SOLUTION: A first coil and a second coil wound in a solenoid form are provided at both ends of a plate-shaped magnetic body core. A third coil wound in a spiral form is provided on a surface of the magnetic body core between the first coil and the second coil. The first coil, the second coil, and the third coil are connected in series.

Description

本発明は、携帯機器端末等に内蔵され、近距離の非接触通信に用いられるアンテナコイルに係わる。   The present invention relates to an antenna coil that is built in a portable device terminal or the like and used for short-range non-contact communication.

携帯端末等とリーダーライタとが近接して通信する非接触通信では、リーダーライタ（Ｒ／Ｗ）に内蔵されたリーダーライタ側アンテナと、携帯機器端末等に内蔵された端末側アンテナとを、電磁的に結合させることによって通信を行う。
リーダーライタ側のアンテナには、導線を枠状に巻線したループコイルが用いられ、端末側のアンテナには、平板状のフェライトに導線を巻線したアンテナコイルを用いられる。 In non-contact communication in which a portable terminal or the like and a reader / writer communicate in close proximity, the reader / writer side antenna built in the reader / writer (R / W) and the terminal side antenna built in the portable device terminal are electromagnetically coupled. Communication is performed by linking them together.
A loop coil in which a conducting wire is wound in a frame shape is used for the antenna on the reader / writer side, and an antenna coil in which a conducting wire is wound on a flat ferrite is used for the antenna on the terminal side.

このような通信では、ループコイルとアンテナコイルとの結合係数によって、通信可能な距離が変動する。結合係数ｋは、ループコイルで発生した磁束Φ１に対する、アンテナコイルと鎖交する磁束Φ２の割合で表され、ｋ＝Φ２／Φ１である。結合係数ｋが小さいと、通信可能な距離は短くなる。 In such communication, the communicable distance varies depending on the coupling coefficient between the loop coil and the antenna coil. The coupling coefficient k is represented by the ratio of the magnetic flux Φ 2 interlinked with the antenna coil to the magnetic flux Φ 1 generated in the loop coil, and k = Φ 2 / Φ 1 . When the coupling coefficient k is small, the communicable distance becomes short.

図６は、ループコイルと、従来のアンテナコイルとが非接触通信する斜視図を示す。
図６に示すように、長さｌ、幅ｗ、厚さｔの平板状の磁性体コア６１に第１のコイル６２と第２のコイル６３がソレノイド状に巻回された端末側のアンテナコイル６０が、略四角形の枠状に巻線されたループコイル７０と対峙し、ループコイル７０の対辺を横切るように配置されている。
第１のコイル６２と第２のコイル６３は、磁性体コア６１の両端に巻回され、第１のコイル６２と第２のコイル６３は離間しているとともに、ループコイル７０のそれぞれの対辺を横切るように配置されている。 FIG. 6 shows a perspective view in which a loop coil and a conventional antenna coil communicate in a contactless manner.
As shown in FIG. 6, a terminal-side antenna coil in which a first coil 62 and a second coil 63 are wound in a solenoid shape on a flat magnetic core 61 having a length l, a width w, and a thickness t. 60 is arranged so as to face the loop coil 70 wound in a substantially rectangular frame shape and cross across the opposite side of the loop coil 70.
The first coil 62 and the second coil 63 are wound around both ends of the magnetic core 61, the first coil 62 and the second coil 63 are separated from each other, and the opposite sides of the loop coil 70 are connected to each other. It is arranged to cross.

特開２００８−３５４６４号公報JP 2008-35464 A

携帯機器の小型軽量化に伴い、特に端末側のアンテナコイルは薄型化が強く望まれている。そのため、従来のアンテナコイルは、磁性体コアの厚さを薄くして薄型化していた。   As mobile devices become smaller and lighter, it is strongly desired that the antenna coil on the terminal side be particularly thin. Therefore, the conventional antenna coil has been thinned by reducing the thickness of the magnetic core.

図７は、ループコイルとアンテナコイルとの間の距離を一定とし、磁性体コアの厚さを変化させた場合の、ループコイルとアンテナコイルの結合係数の変化を示すグラフである。
図７において、横軸は磁性体コアの厚さｔ［ｍｍ］、縦軸は、結合係数ｋを示す。磁性体コアは、幅ｗ＝９［ｍｍ］、長さｌ＝１００［ｍｍ］である。
グラフより、例えば、磁性体コアの寸法が、幅ｗ＝９［ｍｍ］、厚さｔ＝０．２［ｍｍ］、長さｌ＝１００［ｍｍ］の場合の結合係数は、約０．０４であり、磁性体コアの厚さｔが厚くなるに従い、結合係数ｋが大きくなることがわかる。 FIG. 7 is a graph showing a change in the coupling coefficient between the loop coil and the antenna coil when the distance between the loop coil and the antenna coil is constant and the thickness of the magnetic core is changed.
In FIG. 7, the horizontal axis indicates the thickness t [mm] of the magnetic core, and the vertical axis indicates the coupling coefficient k. The magnetic core has a width w = 9 [mm] and a length l = 100 [mm].
From the graph, for example, when the dimension of the magnetic core is a width w = 9 [mm], a thickness t = 0.2 [mm], and a length l = 100 [mm], the coupling coefficient is about 0.04. It can be seen that the coupling coefficient k increases as the thickness t of the magnetic core increases.

図８は、図５のＡ−Ａ断面における磁束のシミュレーション結果を示す。
ループコイル７０に電流が流れると、ループコイル７０の巻線を中心に磁束が発生する。
発生した一部の磁束は、アンテナコイル６０の磁性体コア６１の側面から磁性体コア６１の内部に入射し、磁性体コア６１の内部を曲げられながら進み、第１のコイル６２または第２のコイル６３の巻軸を貫き、磁性体コア６１の端部から射出する。
一方、別の一部の磁束は、図中９０ａ〜９０ｄに示すように、磁性体コア６１の側面から入射し、磁性体コアの内部を曲げられながら進み、第１のコイル６２または第２のコイル６３の巻軸を貫かずに磁性体コア６１の反対の側面から出射する。このような磁束９０ａ〜９０ｄは、結合係数には寄与しない。 FIG. 8 shows a simulation result of the magnetic flux in the AA cross section of FIG.
When a current flows through the loop coil 70, a magnetic flux is generated around the winding of the loop coil 70.
A part of the generated magnetic flux enters the magnetic core 61 from the side surface of the magnetic core 61 of the antenna coil 60, proceeds while being bent inside the magnetic core 61, and the first coil 62 or the second coil. It passes through the winding axis of the coil 63 and is ejected from the end of the magnetic core 61.
On the other hand, as shown by 90a to 90d in the figure, another part of the magnetic flux is incident from the side surface of the magnetic core 61, proceeds while being bent inside the magnetic core, and the first coil 62 or the second coil The light is emitted from the opposite side of the magnetic core 61 without passing through the winding axis of the coil 63. Such magnetic fluxes 90a to 90d do not contribute to the coupling coefficient.

磁性体コアの厚さを薄くすると、磁性体コアの中で十分に曲げられずに、第１のコイル６２または第２のコイル６３の巻軸を貫かずに、磁性体コアの反対の側面から出射してしまう磁束の割合が多くなり、その結果、ループアンテナとアンテナコイルの結合係数が小さくなる。   When the thickness of the magnetic core is reduced, the magnetic core is not bent sufficiently and does not penetrate the winding axis of the first coil 62 or the second coil 63, and from the opposite side of the magnetic core. The ratio of the magnetic flux that exits increases, and as a result, the coupling coefficient between the loop antenna and the antenna coil decreases.

このように、アンテナコイルを薄型化するために、磁性体コアを薄くすると、ループアンテナとアンテナコイルとの間の結合係数が小さくなり、通信可能な距離が短くなるという問題があった。
本発明の目的は、上記した問題を解決するためのものであり、アンテナコイルの磁性体コアを薄型化しても、結合係数の高いアンテナコイルを提供することを目的とする。 Thus, if the magnetic core is made thin in order to reduce the thickness of the antenna coil, there is a problem that the coupling coefficient between the loop antenna and the antenna coil becomes small and the communicable distance becomes short.
An object of the present invention is to solve the above-described problem, and an object of the present invention is to provide an antenna coil having a high coupling coefficient even if the magnetic core of the antenna coil is thinned.

本発明のアンテナコイルは、
平板状の磁性体コアと、前記磁性体コアの両端部にソレノイド状に巻回され、夫々が離間して配置された第１のコイルと第２のコイルと、
前記第１のコイルと前記第２のコイルとの間の、前記磁性体コアの表面に配置されたスパイラル状に巻回された第３のコイルと、
を備え、ループコイルに対峙して配置されるアンテナコイルであって、
前記磁性体コアの中心から前記第１のコイルの巻軸を貫く方向の磁束により前記第１のコイルに生じる電圧と、
前記磁性体コアの中心から前記第２のコイルの巻軸を貫く方向の磁束により前記第２のコイルに生じる電圧と、
前記表面から前記第３のコイルの巻軸を貫く方向の磁束により前記第３のコイルに生じる電圧とが
互いに強められるように、
前記第１のコイルと前記第２のコイルと前記第３のコイルとを、直列に接続したことを特徴とすることを特徴とする。 The antenna coil of the present invention is
A flat magnetic core, a first coil and a second coil that are wound in a solenoid shape around both ends of the magnetic core and are spaced apart from each other;
A third coil wound in a spiral shape disposed on the surface of the magnetic core between the first coil and the second coil;
An antenna coil disposed opposite to the loop coil,
A voltage generated in the first coil by a magnetic flux in a direction penetrating the winding axis of the first coil from the center of the magnetic core;
A voltage generated in the second coil by magnetic flux in a direction penetrating the winding axis of the second coil from the center of the magnetic core;
The voltage generated in the third coil by the magnetic flux in the direction penetrating the winding axis of the third coil from the surface is strengthened mutually.
The first coil, the second coil, and the third coil are connected in series.

本発明のアンテナコイルによれば、端末側のアンテナコイルの磁性体コアの厚さを薄くしても、リーダーライタ側のアンテナコイルと端末側のアンテナコイルとの間の結合係数を大きくすることができる。その結果、薄型化しても通信可能な距離が短くならない、アンテナコイルとすることができる。   According to the antenna coil of the present invention, even if the thickness of the magnetic core of the antenna coil on the terminal side is reduced, the coupling coefficient between the antenna coil on the reader / writer side and the antenna coil on the terminal side can be increased. it can. As a result, it is possible to provide an antenna coil that does not shorten the communicable distance even if it is thinned.

本発明のアンテナコイルを用いた非接触通信の一実施例を示す斜視図である。It is a perspective view which shows one Example of non-contact communication using the antenna coil of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１のアンテナコイルのコイルの接続を説明する図である。It is a figure explaining the connection of the coil of the antenna coil of FIG. 図１の結合係数を示すグラフである。It is a graph which shows the coupling coefficient of FIG. 図１の磁束のシミュレーション結果を示す図である。It is a figure which shows the simulation result of the magnetic flux of FIG. 従来のアンテナコイルを用いた非接触通信の一実施例を示す斜視図である。It is a perspective view which shows one Example of the non-contact communication using the conventional antenna coil. 図６の結合係数を示すグラフである。It is a graph which shows the coupling coefficient of FIG. 従来のアンテナコイルの結合係数のシミュレーション結果を示す図である。It is a figure which shows the simulation result of the coupling coefficient of the conventional antenna coil.

以下、図面を用いて本発明のアンテナコイルに係わる一実施例を説明する。
図１は、ループアンテナと、本発明のアンテナコイルとが非接触通信する一実施例の斜視図を示す。図２は、図１のＡ−Ａ断面図を示す。
図１〜２に示すように、本発明のアンテナコイル１０は、略四角形の枠状に巻線されたループコイル２０に対峙し、ループコイル２０の対辺を横切るように配置される。アンテナコイル１０は、平板状の磁性体コア１１と、磁性体コア１１の両端に導線がソレノイド状に巻回された第１のコイル１２および第２のコイル１３と、第１のコイル１２と第２のコイル１３の間の磁性体コア１１のループコイル２０と対峙する表面に導線がスパイラル状に巻回された第３のコイル１４とを備える。
第１のコイル１２と第２のコイル１３は、ループコイル２０のそれぞれの対辺を横切るように配置されている。 Hereinafter, an embodiment of the antenna coil according to the present invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of an embodiment in which a loop antenna and an antenna coil of the present invention communicate in a non-contact manner. FIG. 2 is a cross-sectional view taken along the line AA in FIG.
As shown in FIGS. 1 and 2, the antenna coil 10 of the present invention is disposed so as to face the loop coil 20 wound in a substantially rectangular frame shape and across the opposite side of the loop coil 20. The antenna coil 10 includes a flat magnetic core 11, a first coil 12 and a second coil 13 in which conductive wires are wound around both ends of the magnetic core 11, a first coil 12, and a first coil 12. And a third coil 14 in which a conductive wire is wound in a spiral shape on the surface facing the loop coil 20 of the magnetic core 11 between the two coils 13.
The first coil 12 and the second coil 13 are arranged so as to cross the opposite sides of the loop coil 20.

図３は、第１のコイル１２と第２のコイル１３と第３のコイル１４の巻回方向および接続を詳しく説明する図である。図３に示すように、
磁性体コアの中心から、第１のコイル１２の巻軸を貫き磁性体コアの一方の端部から磁性体コアの外に出る磁束を磁束３１、
磁性体コアの中心から、第２のコイル１３の巻軸を貫き磁性体コアの他方の端部から磁性体コアの外に出る磁束を磁束３２、
磁性体コアの側面から、磁性体コアの内部に入る磁束を磁束３０としたとき、
第１のコイル１２と第２のコイル１３と第３のコイル１４とは、
磁束３１により第１のコイル１２の両端１２ａ、１２ｂの間に生じる電圧と、
磁束３２により第２のコイル１３の両端１３ａ、１３ｂの間に生じる電圧と、
磁束３０により第３のコイル１４の両端１２ｂ、１３ａの間に生じる電圧とが、
強め合うように、第１のコイル１２と第３のコイル１４と第２のコイル１３とが直列に接続されている。 FIG. 3 is a diagram for explaining in detail the winding direction and connection of the first coil 12, the second coil 13, and the third coil 14. As shown in FIG.
From the center of the magnetic core, the magnetic flux 31 passes through the winding axis of the first coil 12 and exits the magnetic core from one end of the magnetic core.
From the center of the magnetic core, the magnetic flux 32 that passes through the winding axis of the second coil 13 and exits from the other end of the magnetic core to the outside of the magnetic core.
When the magnetic flux entering the inside of the magnetic core from the side surface of the magnetic core is the magnetic flux 30,
The first coil 12, the second coil 13, and the third coil 14 are:
A voltage generated between both ends 12a and 12b of the first coil 12 by the magnetic flux 31,
A voltage generated between both ends 13a and 13b of the second coil 13 by the magnetic flux 32;
The voltage generated between both ends 12b and 13a of the third coil 14 by the magnetic flux 30 is
The first coil 12, the third coil 14, and the second coil 13 are connected in series so as to strengthen each other.

図４は、アンテナコイルとループアンテナの間の距離を一定にして、磁性体コアの厚さｔを変化させたときの、ループアンテナとアンテナコイルの結合係数の変化を示すグラフである。
図４において、横軸は磁性体コアの幅ｗ［ｍｍ］、縦軸は、結合係数ｋを示す。磁性体コアは、厚さｔ＝０．２［ｍｍ］、長さｌ＝１００［ｍｍ］である。
図４より、磁性体コアが、幅ｗ＝９［ｍｍ］、厚さｔ＝０．２［ｍｍ］のときの結合係数は、約０．０６であり、これは、図７に示した、磁性体コアが、幅ｗ＝９［ｍｍ］、厚さｔ＝０．２［ｍｍ］のときの結合係数が、約０．０４であることと比較して、結合係数が大きくなっていることがわかる。 FIG. 4 is a graph showing changes in the coupling coefficient between the loop antenna and the antenna coil when the distance t between the antenna coil and the loop antenna is made constant and the thickness t of the magnetic core is changed.
In FIG. 4, the horizontal axis represents the width w [mm] of the magnetic core, and the vertical axis represents the coupling coefficient k. The magnetic core has a thickness t = 0.2 [mm] and a length l = 100 [mm].
From FIG. 4, when the magnetic core has a width w = 9 [mm] and a thickness t = 0.2 [mm], the coupling coefficient is about 0.06, which is shown in FIG. The magnetic core has a larger coupling coefficient than the coupling coefficient when the width w = 9 [mm] and the thickness t = 0.2 [mm] is about 0.04. I understand.

図５は、図１のＡ−Ａ断面における磁束の、シミュレーション結果を示す。
図５に示すように、ループアンテナ２０に電流が流れると、ループコイル２０の周囲に磁束が発生する。
発生した磁束は、アンテナコイル１０の磁性体コア１１の表面から磁性体コア１１の内部に入射し、磁性体コア１１の内部を曲げられながら進み、一部の磁束は第１のコイル１２または第２のコイル１３の巻軸を貫く。さらに、磁性体コア１１の側面から出射する磁束４０ａ〜４０ｄは、第３のコイル１４の巻軸を貫いている。
このように、３つのコイルによって、アンテナコイル１０を貫く磁束の数を多くすることができ、これによりリーダーライタ側のアンテナコイルと端末側のアンテナコイルとの間の結合係数を大きくすることができる。その結果、通信可能な距離を長くすることができる。 FIG. 5 shows a simulation result of the magnetic flux in the AA cross section of FIG.
As shown in FIG. 5, when a current flows through the loop antenna 20, a magnetic flux is generated around the loop coil 20.
The generated magnetic flux enters the magnetic core 11 from the surface of the magnetic core 11 of the antenna coil 10 and proceeds while being bent inside the magnetic core 11, and a part of the magnetic flux is the first coil 12 or the first coil. The winding axis of the second coil 13 is penetrated. Further, the magnetic fluxes 40 a to 40 d emitted from the side surface of the magnetic core 11 penetrate the winding axis of the third coil 14.
In this way, the number of magnetic fluxes penetrating the antenna coil 10 can be increased by the three coils, and thereby the coupling coefficient between the antenna coil on the reader / writer side and the antenna coil on the terminal side can be increased. . As a result, the communicable distance can be increased.

本発明のアンテナコイルは、第１のコイルおよび第２のコイルを貫かない磁束があるにもかかわらず、第３のコイルを貫いた磁束によって、その分、結合係数を大きくできる。
第３のコイルは、ループコイルと対峙しない表面であってもよいが、第３のコイルをループコイルと対峙しない面に配置した場合は、磁束の間隔が広がっているので、対峙する面に配置した場合よりも大きな面積の第３のコイルが必要である。 In the antenna coil of the present invention, although there is a magnetic flux that does not pass through the first coil and the second coil, the coupling coefficient can be increased correspondingly by the magnetic flux that passes through the third coil.
The third coil may be a surface that does not face the loop coil, but when the third coil is arranged on the surface that does not face the loop coil, the magnetic flux is widened, so the third coil is arranged on the surface that faces the loop coil. A third coil with a larger area is required.

第３のコイルは、フレキシブルプリント基板上に印刷して作製することが可能であり、アンテナコイルの厚さを厚くせずに、結合係数の高いアンテナコイルとすることができる。第１のコイルおよび第２のコイルもフレキシブルプリント基板にパターンを作製してもよい。パターンの作製されたフレキシブルプリント基板を、磁性体コアに巻き付けて、パターンがソレノイド状のコイルになるようにパターンの端部を接続する。
また、磁性体コアは、第１のコイルと第２のコイルと第３のコイルで夫々分割されていてもよい。磁性体コアを分割することにより携帯機器への組み込みが容易になる。 The third coil can be manufactured by printing on a flexible printed board, and can be an antenna coil having a high coupling coefficient without increasing the thickness of the antenna coil. The first coil and the second coil may also be formed on the flexible printed board. The flexible printed circuit board on which the pattern is produced is wound around a magnetic core, and the ends of the pattern are connected so that the pattern becomes a solenoidal coil.
The magnetic core may be divided by the first coil, the second coil, and the third coil. By dividing the magnetic core, it can be easily incorporated into a portable device.

１０、６０ アンテナコイル
２０、７０ ループコイル
１１、６１ 磁性体コア
１２、６２ 第１のコイル
１３、６３ 第２のコイル
１４ 第３のコイル 10, 60 Antenna coil 20, 70 Loop coil 11, 61 Magnetic core 12, 62 First coil 13, 63 Second coil 14 Third coil

Claims (3)

平板状の磁性体コアと、前記磁性体コアの両端部にソレノイド状に巻回され、夫々が離間して配置された第１のコイルと第２のコイルと、
前記第１のコイルと前記第２のコイルとの間の、前記磁性体コアの表面に配置されたスパイラル状に巻回された第３のコイルと、
を備え、ループコイルに対峙して配置されるアンテナコイルであって、
前記磁性体コアの中心から前記第１のコイルの巻軸を貫く方向の磁束により前記第１のコイルに生じる電圧と、
前記磁性体コアの中心から前記第２のコイルの巻軸を貫く方向の磁束により前記第２のコイルに生じる電圧と、
前記表面から前記第３のコイルの巻軸を貫く方向の磁束により前記第３のコイルに生じる電圧とが
互いに強められるように、
前記第１のコイルと前記第２のコイルと前記第３のコイルとを、直列に接続したことを特徴とするアンテナコイル。 A flat magnetic core, a first coil and a second coil that are wound in a solenoid shape around both ends of the magnetic core and are spaced apart from each other;
A third coil wound in a spiral shape disposed on the surface of the magnetic core between the first coil and the second coil;
An antenna coil disposed opposite to the loop coil,
A voltage generated in the first coil by a magnetic flux in a direction penetrating the winding axis of the first coil from the center of the magnetic core;
A voltage generated in the second coil by magnetic flux in a direction penetrating the winding axis of the second coil from the center of the magnetic core;
The voltage generated in the third coil by the magnetic flux in the direction penetrating the winding axis of the third coil from the surface is strengthened mutually.
An antenna coil, wherein the first coil, the second coil, and the third coil are connected in series. 前記第３のコイルは、フレキシブルプリント基板上に形成されていることを特徴とする請求項１記載のアンテナコイル。   The antenna coil according to claim 1, wherein the third coil is formed on a flexible printed circuit board. 前記磁性体コアは、第１のコイルと第３のコイルの間と、第２のコイルと第３のコイルの間とで、３つに分解されていることを特徴とする請求項１乃至２記載のアンテナコイル。   3. The magnetic core is divided into three parts between a first coil and a third coil and between a second coil and a third coil. The antenna coil described.
JP2011139166A 2011-06-23 2011-06-23 Antenna coil Pending JP2013009071A (en)

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CN109698401A (en) * 2017-10-23 2019-04-30 普莱默公司 Antenna and LF communication system for the LF communication in vehicle environmental

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DE102013104059A1 (en) * 2013-04-22 2014-10-23 Infineon Technologies Ag Antenna arrangement, communication device and antenna structure
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CN109698401A (en) * 2017-10-23 2019-04-30 普莱默公司 Antenna and LF communication system for the LF communication in vehicle environmental

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