JP6122809B2 - Magnetic field antenna - Google Patents

Magnetic field antenna Download PDF

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JP6122809B2
JP6122809B2 JP2014123207A JP2014123207A JP6122809B2 JP 6122809 B2 JP6122809 B2 JP 6122809B2 JP 2014123207 A JP2014123207 A JP 2014123207A JP 2014123207 A JP2014123207 A JP 2014123207A JP 6122809 B2 JP6122809 B2 JP 6122809B2
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JP2016005065A (en
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佐々木　愛一郎
愛一郎 佐々木
勉 溝田
勉 溝田
森村　浩季
浩季 森村
加々見　修
修 加々見
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Nippon Telegraph and Telephone Corp
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Description

本発明は、磁界アンテナに関するものである。   The present invention relates to a magnetic field antenna.

磁界を利用した近距離無線通信システムが提案されている(特許文献１)。電波の距離減衰特性は20dB/decに留まるが、磁界の減衰特性は60dB/decと急峻である。したがって磁界を利用した無線通信システムにおいては、通信エリア外で磁界強度が急激に減衰するので、エリア近傍の障害物からの反射波の影響を受けにくいというメリットがある。   A short-range wireless communication system using a magnetic field has been proposed (Patent Document 1). The distance attenuation characteristics of radio waves remain at 20 dB / dec, but the attenuation characteristics of magnetic fields are as steep as 60 dB / dec. Therefore, in a wireless communication system using a magnetic field, the magnetic field strength is rapidly attenuated outside the communication area, and thus there is an advantage that it is difficult to be affected by reflected waves from obstacles near the area.

特開２０１３−１２５９９１号公報JP2013-125991A 特開２０１３−１２５９９８号公報JP 2013-125998 A

磁界を生成する磁界アンテナとして、図８に示すようなループアンテナが利用される(特許文献２)。ループアンテナの特徴として、ループ面を対称に表と裏の双方に磁界（磁力線Ｈ）が生成されるという点が挙げられる(図９)。このような特性のデメリットは、例えば、ループアンテナ裏側に導体が存在する場合、磁界が導体と相互作用を起こし、これの影響で、ループアンテナの表側の磁界分布が乱れることである。   As a magnetic field antenna for generating a magnetic field, a loop antenna as shown in FIG. 8 is used (Patent Document 2). A characteristic of the loop antenna is that a magnetic field (lines of magnetic force H) is generated on both the front and back sides of the loop plane symmetrically (FIG. 9). A demerit of such characteristics is that, for example, when a conductor is present on the back side of the loop antenna, the magnetic field interacts with the conductor, and this affects the magnetic field distribution on the front side of the loop antenna.

本発明は、上記の事情を鑑みてなされたものであり、その目的とするところは、所望の方向以外の磁界を小さくできる磁界アンテナを提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a magnetic field antenna capable of reducing a magnetic field in a direction other than a desired direction.

上記の課題を解決するために、本発明の磁界アンテナは、同一方向を向くＭ本（ただし、Ｍ≧４）のブランチを有する磁性体と、前記Ｍ本のブランチのうちの２本のそれぞれに巻かれ、一方端を信号源の出力端子に接続された本流導体線と、前記Ｍ本のブランチに含まれ且つ前記２本のブランチに含まれない前記２本のブランチの隣のブランチのそれぞれに巻かれ、一方端を前記信号源のグラウンド端子に接続し、前記本流導体と反対方向に巻かれた支流導体線とを備え、前記各支流導体線の他方端は、いずれかの前記本流導体線の他方端に接続され、前記各本流導体線の他方端は、いずれかの前記支流導体線の他方端に接続されていることを特徴とする。
In order to solve the above-described problem, the magnetic field antenna of the present invention includes a magnetic body having M (M ≧ 4 ) branches facing in the same direction and two of the M branches. wound, whereas the main flow conductor line connected to an output terminal of the signal source end, each branch next to the contained in the M branches and the two said two branches not included in the branch of the A branch conductor wire wound in one direction and connected to a ground terminal of the signal source and wound in a direction opposite to the main flow conductor, and the other end of each branch conductor wire is one of the main flow conductors It is connected to the other end of the wire, and the other end of each of the main flow conductor wires is connected to the other end of any of the tributary conductor wires.

本発明の磁界アンテナによれば、本流導体線の巻かれたブランチの先端から発生して支流導体線の巻かれたブランチの先端から磁性体に吸収される磁力線は、主にブランチの向く方向に存在するので、その方向以外の磁界を小さくできる。   According to the magnetic field antenna of the present invention, the lines of magnetic force generated from the tip of the branch wound with the main conductor wire and absorbed by the magnetic body from the tip of the branch wound with the branch conductor wire are mainly in the direction of the branch. Since it exists, the magnetic field other than that direction can be reduced.

第１の実施の形態に係る磁界アンテナの平面図を示す。The top view of the magnetic field antenna which concerns on 1st Embodiment is shown. 図１の磁性体の斜視図を示す。The perspective view of the magnetic body of FIG. 1 is shown. 第２の実施の形態に係る磁界アンテナの平面図を示す。The top view of the magnetic field antenna which concerns on 2nd Embodiment is shown. 図３の磁性体の斜視図を示す。The perspective view of the magnetic body of FIG. 3 is shown. 第２の実施の形態に係る磁界アンテナに使用される磁性体の斜視図を示す。The perspective view of the magnetic body used for the magnetic field antenna which concerns on 2nd Embodiment is shown. 第４の実施の形態に係る磁界アンテナ（配線例１）の平面図を示す。The top view of the magnetic field antenna (wiring example 1) which concerns on 4th Embodiment is shown. 第４の実施の形態に係る磁界アンテナ（配線例２）の平面図を示す。The top view of the magnetic field antenna (wiring example 2) which concerns on 4th Embodiment is shown. 従来の磁界アンテナの一例を示す。An example of the conventional magnetic field antenna is shown. 図８に示す磁界アンテナ近傍の磁力線分布を示す。FIG. 9 shows magnetic field line distribution in the vicinity of the magnetic field antenna shown in FIG.

以下、本発明の実施の形態について図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

各実施の形態に係る磁界アンテナは、詳しくは後述するが、同一方向を向くＭ本（ただし、Ｍ＞２）のブランチを有する磁性体と、Ｍ本のブランチのうちのＮ本（ただし、Ｎ＜Ｍ）のそれぞれに巻かれ、一方端を信号源の出力端子に接続された本流導体線と、Ｍ本のブランチに含まれ且つＮ本のブランチに含まれないブランチのそれぞれに巻かれ、一方端を信号源のグラウンド端子に接続された支流導体線とを備え、各支流導体線の他方端は、いずれかの本流導体線の他方端に接続され、各本流導体線の他方端は、いずれかの支流導体線の他方端に接続されていることを特徴とする。   Although the magnetic field antenna according to each embodiment will be described in detail later, a magnetic body having M (M> 2) branches facing the same direction, and N of the M branches (however, N <M) wound around each of a mainstream conductor wire having one end connected to the output terminal of the signal source and each branch included in the M branches and not included in the N branches. A branch conductor line connected to the ground terminal of the signal source, the other end of each branch conductor line is connected to the other end of one of the main stream conductor lines, and the other end of each main stream conductor line is It is connected to the other end of the tributary conductor wire.

[第１の実施の形態]
図１は、第１の実施の形態に係る磁界アンテナの平面図を示し、図２は、図１の磁性体の斜視図を示す。Ｍは２、Ｎは１である。図２では、本流導体線、支流導体線、信号源等を図示省略する。 [First embodiment]
FIG. 1 is a plan view of the magnetic field antenna according to the first embodiment, and FIG. 2 is a perspective view of the magnetic body of FIG. M is 2 and N is 1. In FIG. 2, the main conductor line, the branch conductor line, and the signal source are not shown.

すなわち、磁界アンテナは、ｚ（ｚ＋）方向を向く２本のブランチ１１、１２を有する磁性体１と、２本のブランチのうちの１本（１１）に巻かれ、一方端２Ｈ１を信号源１０の出力端子１０１に接続された本流導体線２Ｈと、２本のブランチ１１、１２に含まれ且つ１本のブランチ１１に含まれないブランチ１２に巻かれ、一方端２Ｓ１を信号源１０のグラウンド端子１０２に接続された支流導体線２Ｓとを備える。   That is, the magnetic field antenna is wound around the magnetic body 1 having the two branches 11 and 12 facing the z (z +) direction and one (11) of the two branches, and one end 2H1 is connected to the signal source 10. The main conductor 2H connected to the output terminal 101 and the branch 12 included in the two branches 11 and 12 and not included in the one branch 11, and one end 2S1 is connected to the ground terminal of the signal source 10. And a tributary conductor wire 2 </ b> S connected to 102.

また、支流導体線２Ｓの他方端２Ｓ２は、本流導体線２Ｈの他方端２Ｈ２に接続され、すなわち、本流導体線２Ｈの他方端２Ｈ２は、支流導体線２Ｓの他方端２Ｓ２に接続されている。グラウンド端子１０２は接地されている。   Further, the other end 2S2 of the branch conductor line 2S is connected to the other end 2H2 of the mainstream conductor line 2H, that is, the other end 2H2 of the mainstream conductor line 2H is connected to the other end 2S2 of the branch conductor line 2S. The ground terminal 102 is grounded.

磁性体１は、いわゆるＵ字形である。   The magnetic body 1 has a so-called U-shape.

例えば、支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲを介して信号源１０のグラウンド端子１０２に接続されている。   For example, one end 2S1 of the branch conductor line 2S is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR.

信号源１０から電流ｉを供給すると、ブランチ１１の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１２の先端から磁性体１内に吸収される。可変抵抗ＶＲを使って電流ｉを調整することにより、磁力線Ｈの強度を調整できる。なお、調整が不要なら可変抵抗は不要である。   When the current i is supplied from the signal source 10, a magnetic force line H is generated from the tip of the branch 11, and the magnetic force line H is absorbed into the magnetic body 1 from the tip of the branch 12. By adjusting the current i using the variable resistor VR, the strength of the magnetic field lines H can be adjusted. If adjustment is not required, the variable resistor is unnecessary.

ブランチ１１、１２は共にｚ（ｚ＋）方向を向くので、磁力線Ｈは主にその方向にしか存在せず、ｚ（ｚ−）方向の磁力線は極めて少ない（磁界は極めて小さい）。よって、ｚ（ｚ−）方向に金属があっても、磁界分布の乱れを極めて少なくできるという効果がある。   Since both the branches 11 and 12 are oriented in the z (z +) direction, the magnetic field lines H exist mainly only in that direction, and the magnetic field lines in the z (z−) direction are extremely small (the magnetic field is very small). Therefore, even if there is a metal in the z (z−) direction, there is an effect that disturbance of the magnetic field distribution can be extremely reduced.

[第２の実施の形態]
図３は、第２の実施の形態に係る磁界アンテナの平面図を示し、図４は、図３の磁性体の斜視図を示す。Ｍは３、Ｎは１である。図４では、本流導体線、支流導体線、信号源等を図示省略する。 [Second Embodiment]
FIG. 3 is a plan view of the magnetic field antenna according to the second embodiment, and FIG. 4 is a perspective view of the magnetic body of FIG. M is 3 and N is 1. In FIG. 4, the main conductor line, the branch conductor line, the signal source, and the like are not shown.

すなわち、磁界アンテナは、ｚ（ｚ＋）方向を向く３本のブランチ１１、１２、１３を有する磁性体１と、３本のブランチのうちの１本（１１）に巻かれ、一方端２Ｈ１を信号源１０の出力端子１０１に接続された本流導体線２Ｈと、３本のブランチ１１、１２、１３に含まれ且つ１本のブランチ１１に含まれないブランチ１２、１３のそれぞれに巻かれ、一方端２Ｓ１を信号源１０のグラウンド端子１０２に接続された支流導体線２Ｓとを備える。   That is, the magnetic field antenna is wound around the magnetic body 1 having the three branches 11, 12, 13 facing the z (z +) direction, and one of the three branches (11), and one end 2H1 is signaled. The main stream conductor wire 2H connected to the output terminal 101 of the source 10 is wound around each of the branches 12 and 13 included in the three branches 11, 12, and 13 but not included in the one branch 11, 2S1 is provided with a branch conductor line 2S connected to the ground terminal 102 of the signal source 10.

また、支流導体線２Ｓの他方端２Ｓ２は、本流導体線２Ｈの他方端２Ｈ２に接続され、すなわち、本流導体線２Ｈの他方端２Ｈ２は、支流導体線２Ｓの他方端２Ｓ２に接続されている。グラウンド端子１０２は接地されている。   Further, the other end 2S2 of the branch conductor line 2S is connected to the other end 2H2 of the mainstream conductor line 2H, that is, the other end 2H2 of the mainstream conductor line 2H is connected to the other end 2S2 of the branch conductor line 2S. The ground terminal 102 is grounded.

磁性体１は、いわゆるＥ字形である。すなわち、ｚ方向の逆方向に磁性体１を見て、１（＝Ｎ）本のブランチ１１は、残りの各ブランチ１２、１３の位置を結ぶ直線のいずれかの位置（例えば、中点）に配置されている。   The magnetic body 1 has a so-called E shape. That is, when viewing the magnetic body 1 in the direction opposite to the z direction, the 1 (= N) branches 11 are located at any position (for example, the midpoint) of the straight lines connecting the positions of the remaining branches 12 and 13. Has been placed.

例えば、ブランチ１２に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ１を介して信号源１０のグラウンド端子１０２に接続されている。   For example, one end 2S1 of the branch conductor wire 2S wound around the branch 12 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR1.

また、ブランチ１３に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ１を介して信号源１０のグラウンド端子１０２に接続されている。   One end 2S1 of the branch conductor wire 2S wound around the branch 13 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR1.

信号源１０から電流ｉを供給すると、ブランチ１１の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１２、１３の先端から磁性体１内に吸収される。可変抵抗ＶＲ１、ＶＲ２を使って電流ｉ１、ｉ２を調整することにより、磁力線Ｈの強度を個別に調整できる。なお、調整が不要なら可変抵抗は不要である。   When a current i is supplied from the signal source 10, a magnetic force line H is generated from the tip of the branch 11, and the magnetic force line H is absorbed into the magnetic body 1 from the tips of the branches 12 and 13. By adjusting the currents i1 and i2 using the variable resistors VR1 and VR2, the strength of the magnetic field lines H can be individually adjusted. If adjustment is not required, the variable resistor is unnecessary.

ブランチ１１、１２、１３は共にｚ（ｚ＋）方向を向くので、磁力線Ｈは主にその方向にしか存在せず、ｚ（ｚ−）方向の磁力線は極めて少ない（磁界は極めて小さい）。よって、ｚ（ｚ−）方向に金属があっても、磁界分布の乱れを極めて少なくできるという効果がある。   Since the branches 11, 12, and 13 all face the z (z +) direction, the magnetic field lines H mainly exist only in that direction, and the magnetic field lines in the z (z−) direction are very small (the magnetic field is very small). Therefore, even if there is a metal in the z (z−) direction, there is an effect that disturbance of the magnetic field distribution can be extremely reduced.

[第３の実施の形態]
図５は、第２の実施の形態に係る磁界アンテナに使用される磁性体の斜視図を示す。図では、本流導体線、支流導体線、信号源等を省略する。Ｍは５、Ｎは１である。 [Third embodiment]
FIG. 5 is a perspective view of a magnetic body used in the magnetic field antenna according to the second embodiment. In the figure, the main conductor line, the branch conductor line, the signal source, etc. are omitted. M is 5 and N is 1.

すなわち、磁界アンテナは、ｚ（ｚ＋）方向を向く５本のブランチ１１、１２、１３、１４、１５を有する磁性体１を備える。図示しないが、磁界アンテナは、５本のブランチのうちの１本（１１）に巻かれ、一方端を信号源の出力端子に接続された本流導体線と、５本のブランチ１１、１２、１３、１４、１５に含まれ且つ１本のブランチ１１に含まれないブランチ１２、１３、１４、１５のそれぞれに巻かれ、一方端を信号源のグラウンド端子に接続された支流導体線とを備える。また、支流導体線の他方端は、本流導体線の他方端に接続され、すなわち、本流導体線の他方端は、支流導体線の他方端に接続されている。グラウンド端子は接地されている。   That is, the magnetic field antenna includes the magnetic body 1 having five branches 11, 12, 13, 14, and 15 that face in the z (z +) direction. Although not shown, the magnetic field antenna is wound around one of the five branches (11), one end of which is connected to the output terminal of the signal source, and the five branches 11, 12, 13 , 14 and 15 and each branch 12, 13, 14 and 15 not included in one branch 11 is provided with a tributary conductor wire having one end connected to the ground terminal of the signal source. In addition, the other end of the branch conductor line is connected to the other end of the main conductor line, that is, the other end of the main conductor line is connected to the other end of the branch conductor line. The ground terminal is grounded.

なお、第１の実施の形態、第２の実施の形態のように、可変抵抗を設けてもよい。   Note that a variable resistor may be provided as in the first embodiment and the second embodiment.

また、ｚ方向の逆方向に磁性体１を見て、１（＝Ｎ）本のブランチ１１が円の中心に配置されているとした場合、各ブランチ１２、１３、１４、１５は、円の円周のいずれかの位置に配置されている。なお、支流導体線および支流導体線が巻かれるブランチの数は共に４だが、３または５以上でもよい。また、その位置は、円周を均等分割する境界であることが好ましい。   Further, when the magnetic body 1 is viewed in the direction opposite to the z direction and 1 (= N) branches 11 are arranged at the center of the circle, each of the branches 12, 13, 14, and 15 It is arranged at any position on the circumference. The number of branches on which the branch conductor wire and the branch conductor wire are wound is four, but may be three or five or more. The position is preferably a boundary that equally divides the circumference.

信号源から電流を供給すると、ブランチ１１の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１２、１３、１４、１５の先端から磁性体１内に吸収される。可変抵抗を使って電流を調整することにより、磁力線Ｈの強度を調整できる。なお、調整が不要なら可変抵抗は不要である。   When a current is supplied from the signal source, a magnetic field line H is generated from the tip of the branch 11, and the magnetic field line H is absorbed into the magnetic body 1 from the tips of the branches 12, 13, 14, and 15. The intensity of the magnetic field lines H can be adjusted by adjusting the current using a variable resistor. If adjustment is not required, the variable resistor is unnecessary.

ブランチ１１、１２、１３、１４、１５は共にｚ（ｚ＋）方向を向くので、磁力線Ｈは主にその方向にしか存在せず、ｚ（ｚ−）方向の磁力線は極めて少ない（磁界は極めて小さい）。よって、ｚ（ｚ−）方向に金属があっても、磁界分布の乱れを極めて少なくできるという効果がある。   Since the branches 11, 12, 13, 14, and 15 all face the z (z +) direction, the magnetic field lines H mainly exist only in that direction, and the magnetic field lines in the z (z−) direction are very few (the magnetic field is very small). ). Therefore, even if there is a metal in the z (z−) direction, there is an effect that disturbance of the magnetic field distribution can be extremely reduced.

[第４の実施の形態]
図６は、第４の実施の形態に係る磁界アンテナ（配線例１）の平面図を示す。Ｍは５、Ｎは２である。 [Fourth embodiment]
FIG. 6 is a plan view of a magnetic field antenna (Wiring Example 1) according to the fourth embodiment. M is 5 and N is 2.

すなわち、磁界アンテナは、ｚ（ｚ＋）方向を向く５本のブランチ１１、１２、１３、１４、１５を有する磁性体１と、５本のブランチのうちの２本（１１、１２）のそれぞれに巻かれ、一方端２Ｈ１を信号源１０の出力端子１０１に接続された本流導体線２Ｈと、５本のブランチ１１、１２、１３、１４、１５に含まれ且つ２本のブランチ１１、１２に含まれないブランチ１３、１４、１５のそれぞれに巻かれ、一方端２Ｓ１を信号源１０のグラウンド端子１０２に接続された支流導体線２Ｓとを備える。   That is, the magnetic field antenna is provided on each of the magnetic body 1 having five branches 11, 12, 13, 14, and 15 facing the z (z +) direction, and two of the five branches (11 and 12). Wrapped and included in the main stream conductor wire 2H whose one end 2H1 is connected to the output terminal 101 of the signal source 10 and the five branches 11, 12, 13, 14, 15 and included in the two branches 11, 12. The branch branches 13, 14, and 15 are each provided with a branch conductor line 2 </ b> S that has one end 2 </ b> S 1 connected to the ground terminal 102 of the signal source 10.

また、ブランチ１３、１４に巻かれた支流導体線２Ｓの他方端２Ｓ２は、ブランチ１１に巻かれた本流導体線２Ｈの他方端２Ｈ２に接続される。ブランチ１５に巻かれた支流導体線２Ｓの他方端２Ｓ２は、ブランチ１２に巻かれた本流導体線２Ｈの他方端２Ｈ２に接続される。すなわち、本流導体線２Ｈの他方端２Ｈ２は、支流導体線２Ｓの他方端２Ｓ２に接続されている。グラウンド端子１０２は接地されている。   The other end 2S2 of the branch conductor wire 2S wound around the branches 13 and 14 is connected to the other end 2H2 of the mainstream conductor wire 2H wound around the branch 11. The other end 2S2 of the branch conductor wire 2S wound around the branch 15 is connected to the other end 2H2 of the mainstream conductor wire 2H wound around the branch 12. That is, the other end 2H2 of the mainstream conductor line 2H is connected to the other end 2S2 of the branch conductor line 2S. The ground terminal 102 is grounded.

例えば、ブランチ１３に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ１を介して信号源１０のグラウンド端子１０２に接続されている。   For example, one end 2S1 of the branch conductor wire 2S wound around the branch 13 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR1.

また、ブランチ１４に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ２を介して信号源１０のグラウンド端子１０２に接続されている。   One end 2S1 of the branch conductor wire 2S wound around the branch 14 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR2.

また、ブランチ１５に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ３を介して信号源１０のグラウンド端子１０２に接続されている。   One end 2S1 of the branch conductor wire 2S wound around the branch 15 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR3.

信号源１０から電流ｉを供給すると、ブランチ１１の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１３、１４の先端から磁性体１内に吸収される。可変抵抗ＶＲ１、ＶＲ２を使って電流ｉ１、ｉ２を調整することにより、磁力線Ｈの強度を個別に調整できる。なお、調整が不要なら可変抵抗は不要である。   When a current i is supplied from the signal source 10, a magnetic force line H is generated from the tip of the branch 11, and the magnetic force line H is absorbed into the magnetic body 1 from the tips of the branches 13 and 14. By adjusting the currents i1 and i2 using the variable resistors VR1 and VR2, the strength of the magnetic field lines H can be individually adjusted. If adjustment is not required, the variable resistor is unnecessary.

また、信号源１０から電流ｉを供給すると、ブランチ１２の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１５の先端から磁性体１内に吸収される。可変抵抗ＶＲ３を使って電流ｉ３を調整することにより、磁力線Ｈの強度を調整できる。なお、調整が不要なら可変抵抗は不要である。   Further, when a current i is supplied from the signal source 10, a magnetic force line H is generated from the tip of the branch 12, and the magnetic force line H is absorbed into the magnetic body 1 from the tip of the branch 15. By adjusting the current i3 using the variable resistor VR3, the strength of the magnetic field lines H can be adjusted. If adjustment is not required, the variable resistor is unnecessary.

ブランチ１１、１２、１３、１４、１５は共にｚ（ｚ＋）方向を向くので、磁力線Ｈは主にその方向にしか存在せず、ｚ（ｚ−）方向の磁力線は極めて少ない（磁界は極めて小さい）。よって、ｚ（ｚ−）方向に金属があっても、磁界分布の乱れを極めて少なくできるという効果がある。   Since the branches 11, 12, 13, 14, and 15 all face the z (z +) direction, the magnetic field lines H mainly exist only in that direction, and the magnetic field lines in the z (z−) direction are very few (the magnetic field is very small). ). Therefore, even if there is a metal in the z (z−) direction, there is an effect that disturbance of the magnetic field distribution can be extremely reduced.

また、図のように、前者の磁力線Ｈが存在する空間と後者の磁力線Ｈが存在する空間を分離させ、磁力線がほとんど存在しない空間Ａを意図的に作ることができる。例えば、前者の磁力線が存在する空間と後者の磁力線が存在する空間とで異なるサービスを提供するなどの応用が可能である。   Further, as shown in the figure, the space where the former magnetic lines of force H and the space where the latter magnetic lines of force H are present can be separated to intentionally create a space A where almost no magnetic lines of force exist. For example, it is possible to apply different services in a space where the former magnetic field lines exist and a space where the latter magnetic field lines exist.

図７は、第４の実施の形態に係る磁界アンテナ（配線例２）の平面図を示す。Ｍは５、Ｎは２である。   FIG. 7 is a plan view of a magnetic field antenna (Wiring Example 2) according to the fourth embodiment. M is 5 and N is 2.

すなわち、磁界アンテナは、ｚ（ｚ＋）方向を向く５本のブランチ１１、１２、１３、１４、１５を有する磁性体１と、５本のブランチのうちの２本（１１、１２）のそれぞれに巻かれ、一方端２Ｈ１を信号源１０（又は信号源１０Ａ）の出力端子１０１に接続された本流導体線２Ｈと、５本のブランチ１１、１２、１３、１４、１５に含まれ且つ２本のブランチ１１、１２に含まれないブランチ１３、１４、１５のそれぞれに巻かれ、一方端２Ｓ１を信号源１０（又は信号源１０Ａ）のグラウンド端子１０２に接続された支流導体線２Ｓとを備える。   That is, the magnetic field antenna is provided on each of the magnetic body 1 having five branches 11, 12, 13, 14, and 15 facing the z (z +) direction, and two of the five branches (11 and 12). The main stream conductor wire 2H is wound and has one end 2H1 connected to the output terminal 101 of the signal source 10 (or signal source 10A), and included in the five branches 11, 12, 13, 14, 15 and two A branch conductor wire 2S wound around each of the branches 13, 14, 15 not included in the branches 11, 12 and having one end 2S1 connected to the ground terminal 102 of the signal source 10 (or signal source 10A) is provided.

ブランチ１１に巻かれた本流導体線の一方端は信号源１０の出力端子に接続され、ブランチ１２に巻かれた本流導体線の一方端は信号源１０Ａの出力端子に接続される。ブランチ１３、１４に巻かれた支流導体線の一方端は、信号源１０のグラウンド端子に接続され、ブランチ１５に巻かれた支流導体線の一方端は、信号源１０Ａのグラウンド端子に接続される。   One end of the mainstream conductor wire wound around the branch 11 is connected to the output terminal of the signal source 10, and one end of the mainstream conductor wire wound around the branch 12 is connected to the output terminal of the signal source 10A. One end of the branch conductor wire wound around the branches 13 and 14 is connected to the ground terminal of the signal source 10, and one end of the branch conductor wire wound around the branch 15 is connected to the ground terminal of the signal source 10A. .

また、ブランチ１３、１４に巻かれた支流導体線２Ｓの他方端２Ｓ２は、ブランチ１１に巻かれた本流導体線２Ｈの他方端２Ｈ２に接続され、ブランチ１５に巻かれた支流導体線２Ｓの他方端２Ｓ２は、ブランチ１２に巻かれた本流導体線２Ｈの他方端２Ｈ２に接続され、すなわち、本流導体線２Ｈの他方端２Ｈ２は、支流導体線２Ｓの他方端２Ｓ２に接続されている。   The other end 2S2 of the branch conductor wire 2S wound around the branches 13 and 14 is connected to the other end 2H2 of the main conductor wire 2H wound around the branch 11, and the other end of the branch conductor wire 2S wound around the branch 15 is connected. The end 2S2 is connected to the other end 2H2 of the mainstream conductor line 2H wound around the branch 12, that is, the other end 2H2 of the mainstream conductor line 2H is connected to the other end 2S2 of the branch conductor line 2S.

２つのグラウンド端子１０２は接地されている。   The two ground terminals 102 are grounded.

例えば、ブランチ１３に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ１を介して信号源１０のグラウンド端子１０２に接続されている。   For example, one end 2S1 of the branch conductor wire 2S wound around the branch 13 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR1.

また、ブランチ１４に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ２を介して信号源１０のグラウンド端子１０２に接続されている。   One end 2S1 of the branch conductor wire 2S wound around the branch 14 is connected to the ground terminal 102 of the signal source 10 via the variable resistor VR2.

また、ブランチ１５に巻かれた支流導体線２Ｓの一方端２Ｓ１は可変抵抗ＶＲ３を介して信号源１０Ａのグラウンド端子１０２に接続されている。   One end 2S1 of the branch conductor wire 2S wound around the branch 15 is connected to the ground terminal 102 of the signal source 10A via the variable resistor VR3.

信号源１０から電流ｉを供給すると、ブランチ１１の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１３、１４の先端から磁性体１内に吸収される。可変抵抗ＶＲ１、ＶＲ２を使って電流ｉ１、ｉ２を調整することにより、磁力線Ｈの強度を個別に調整できる。なお、調整が不要なら可変抵抗は不要である。   When a current i is supplied from the signal source 10, a magnetic force line H is generated from the tip of the branch 11, and the magnetic force line H is absorbed into the magnetic body 1 from the tips of the branches 13 and 14. By adjusting the currents i1 and i2 using the variable resistors VR1 and VR2, the strength of the magnetic field lines H can be individually adjusted. If adjustment is not required, the variable resistor is unnecessary.

また、信号源１０Ａから電流ｉａを供給すると、ブランチ１２の先端から磁力線Ｈが発生し、磁力線Ｈはブランチ１５の先端から磁性体１内に吸収される。可変抵抗ＶＲ３を使って電流ｉａを調整することにより、磁力線Ｈの強度を調整できる。なお、調整が不要なら可変抵抗は不要である。   Further, when the current ia is supplied from the signal source 10 </ b> A, a magnetic force line H is generated from the tip of the branch 12, and the magnetic force line H is absorbed into the magnetic body 1 from the tip of the branch 15. By adjusting the current ia using the variable resistor VR3, the strength of the magnetic field lines H can be adjusted. If adjustment is not required, the variable resistor is unnecessary.

ブランチ１１、１２、１３、１４、１５は共にｚ（ｚ＋）方向を向くので、磁力線Ｈは主にその方向にしか存在せず、ｚ（ｚ−）方向の磁力線は極めて少ない（磁界は極めて小さい）。よって、ｚ（ｚ−）方向に金属があっても、磁界分布の乱れを極めて少なくできるという効果がある。   Since the branches 11, 12, 13, 14, and 15 all face the z (z +) direction, the magnetic field lines H mainly exist only in that direction, and the magnetic field lines in the z (z−) direction are very few (the magnetic field is very small). ). Therefore, even if there is a metal in the z (z−) direction, there is an effect that disturbance of the magnetic field distribution can be extremely reduced.

また、図のように、前者の磁力線Ｈが存在する空間と後者の磁力線Ｈが存在する空間を分離させ、磁力線がほとんど存在しない空間Ａを意図的に作ることができる。前者の磁力線が存在する空間と後者の磁力線が存在する空間とで異なるサービスを提供するなどの応用が可能である。   Further, as shown in the figure, the space where the former magnetic lines of force H and the space where the latter magnetic lines of force H are present can be separated to intentionally create a space A where almost no magnetic lines of force exist. Applications such as providing different services in a space where the former magnetic field lines exist and a space where the latter magnetic field lines exist are possible.

１…磁性体
２Ｈ…本流導体線
２Ｈ１…本流導体線の一方端
２Ｈ２…本流導体線の他方端
２Ｓ…支流導体線
２Ｓ１…支流導体線の一方端
２Ｓ２…支流導体線 他方端
１０、１０Ａ…信号源
１１、１２、１３、１４、１５…ブランチ
１０１…信号源の出力端子
１０２…信号源のグラウンド端子
ｉ、ｉ１、ｉ２、ｉ３、ｉａ…電流
ＶＲ１、ＶＲ２、ＶＲ３…可変抵抗
DESCRIPTION OF SYMBOLS 1 ... Magnetic body 2H ... Mainstream conductor wire 2H1 ... One end of mainstream conductor wire 2H2 ... The other end of mainstream conductor wire 2S ... Tributary conductor wire 2S1 ... One end of tributary conductor wire 2S2 ... Tributary conductor wire The other end 10, 10A ... Signal Source 11, 12, 13, 14, 15 ... Branch 101 ... Signal source output terminal 102 ... Signal source ground terminal i, i1, i2, i3, ia ... Current VR1, VR2, VR3 ... Variable resistance

Claims (2)

同一方向を向くＭ本（ただし、Ｍ≧４）のブランチを有する磁性体と、
前記Ｍ本のブランチのうちの２本のそれぞれに巻かれ、一方端を信号源の出力端子に接続された本流導体線と、
前記Ｍ本のブランチに含まれ且つ前記２本のブランチに含まれない前記２本のブランチの隣のブランチのそれぞれに巻かれ、一方端を前記信号源のグラウンド端子に接続し、前記本流導体線と反対方向に巻かれた支流導体線とを備え、
前記各支流導体線の他方端は、いずれかの前記本流導体線の他方端に接続され、
前記各本流導体線の他方端は、いずれかの前記支流導体線の他方端に接続されていることを特徴とする磁界アンテナ。 A magnetic body having M (where M ≧ 4) branches facing the same direction;
A mainstream conductor wire wound around each of two of the M branches and having one end connected to the output terminal of the signal source;
Wrapped in each of the adjacent branches of the two branches that are included in the M branches and not included in the two branches, one end is connected to the ground terminal of the signal source, and the main conductor line And a tributary conductor wire wound in the opposite direction,
The other end of each of the branch conductor lines is connected to the other end of any of the main stream conductor lines,
The other end of each of the main flow conductor wires is connected to the other end of any of the branch flow conductor wires. 同一方向を向くＭ本（ただし、Ｍ≧４）のブランチを有する磁性体と、
前記Ｍ本のブランチのうちの１本に巻かれ、一方端を第１信号源の出力端に接続した第１本流導体線と、
前記Ｍ本のブランチから前記第１本流導体線が巻かれたブランチを除いた残りのブランチのうちの１本に巻かれ、一方端を第２信号源の出力端に接続した第２本流導体線と、
一方端を前記第１信号源のグランド端子に接続し、前記第１本流導体線が巻かれたブランチの隣の１本以上のブランチに前記第１本流導体線と反対方向に巻かれた第１支流導体線と、
一方端を前記第２信号源のグラウンド端子に接続し、前記第２本流導体線が巻かれたブランチの隣の１本以上のブランチに前記第２本流導体線と反対方向に巻かれた第２支流導体線とを備え、
前記第１支流導体線の他方端は、前記第１本流導体線の他方端に接続され、
前記第２支流導体線の他方端は、前記第２本流導体線の他方端に接続されていることを特徴とする磁界アンテナ。 A magnetic body having M (where M ≧ 4) branches facing the same direction;
A first mainstream conductor wire wound around one of the M branches and having one end connected to the output end of the first signal source;
A second mainstream conductor wire wound around one of the remaining branches excluding the branch around which the first mainstream conductor wire is wound from the M branches and having one end connected to the output end of the second signal source. When,
The first end is connected to the ground terminal of the first signal source and is wound in one or more branches adjacent to the branch around which the first mainstream conductor wire is wound in the direction opposite to the first mainstream conductor wire. A tributary conductor wire,
The second end is connected to the ground terminal of the second signal source, and one or more branches adjacent to the branch around which the second main conductor line is wound are wound in the opposite direction to the second main conductor line. A branch conductor wire,
The other end of the first tributary conductor wire is connected to the other end of the first mainstream conductor wire;
The other end of the second branch conductor wire is connected to the other end of the second main conductor wire.
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