JP2009290408A - Monopole antenna - Google Patents

Monopole antenna Download PDF

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JP2009290408A
JP2009290408A JP2008139061A JP2008139061A JP2009290408A JP 2009290408 A JP2009290408 A JP 2009290408A JP 2008139061 A JP2008139061 A JP 2008139061A JP 2008139061 A JP2008139061 A JP 2008139061A JP 2009290408 A JP2009290408 A JP 2009290408A
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coil
monopole antenna
axis
parasitic
present
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JP5049877B2 (en
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Kikuo Mori
喜久男 森
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Yazaki Corp
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Yazaki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a monopole antenna capable of easily adjusting a resonant frequency when an impedance characteristic is improved. <P>SOLUTION: A monopole antenna body 2 includes a coil 21 wound spirally so as to surround an axis Z, and a rising part 22 provided at one end of the coil 21 along the axis Z. A linear parasitic coil 3 wound spirally so as to surround the axis Z is arranged separately on the side of the coil 21 of the monopole antenna body 2 in the direction of the axis Z. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、モノポールアンテナに係り、特に、軸周りを囲むように螺旋状に巻回されたコイル部、及び、前記コイル部の一端に設けられた前記軸に沿った立ち上がり部、から構成された線状のモノポールアンテナ本体を有するモノポールアンテナに関するものである。   The present invention relates to a monopole antenna, and in particular, includes a coil portion spirally wound around an axis and a rising portion along the axis provided at one end of the coil portion. The present invention relates to a monopole antenna having a linear monopole antenna body.

一般的に、モノポールアンテナは、アンテナ長がλ0／４（λ0：使用波長）の直線状の導体から構成されている。このようなモノポールアンテナは、使用周波数が低いと使用波長λ0が長くなりアンテナ長が長くなる、という問題があった。そこで、例えば、図５に示すように、アンテナ長Ｌ1を短縮するために、モノポールアンテナ１００の一部にコイル部１０１を形成する構成が提案されている。 Typically, the monopole antenna, the antenna length of λ 0/4: and a linear conductor (lambda 0 the wavelength used). Such a monopole antenna has a problem that when the frequency used is low, the wavelength λ 0 is increased and the antenna length is increased. Therefore, for example, as shown in FIG. 5, a configuration in which a coil portion 101 is formed in a part of the monopole antenna 100 has been proposed in order to shorten the antenna length L 1 .

しかしながら、図５に示すように小型化のためにアンテナ長Ｌ1を大幅に短縮すると、モノポールアンテナ１００のインピーダンス特性が劣化して、インピーダンス整合が取れなくなる、という問題があった。即ち、使用周波数ｆ0（＝光速／λ0）で共振してインピーダンス整合が良好になるようにモノポールアンテナ１００を構成する導体の長さをλ0／４としても、モノポールアンテナ１００にコイル部１０１を設けると、図６に示すように、使用周波数ｆ0からズレた周波数で共振してしまい、使用周波数ｆ0付近で良好なインピーダンス整合を取ることができない。 However, as shown in FIG. 5, when the antenna length L 1 is greatly shortened for miniaturization, the impedance characteristic of the monopole antenna 100 is deteriorated and impedance matching cannot be obtained. That is, using the frequency f 0 (= speed of light / lambda 0) is also the length of the conductor resonance to impedance matching constitutes a monopole antenna 100 so as to better as lambda 0/4, the coil monopole antenna 100 the provision of parts 101, as shown in FIG. 6, will resonate at a frequency was shifted from using frequency f 0, it is impossible to take a good impedance matching at around the operating frequency f 0.

上述した共振周波数の使用周波数ｆ0からのズレはコイル部１０１の長さに応じて変動する。このため、従来のモノポールアンテナ１００では、使用周波数ｆ0で共振してインピーダンス整合が良好になるように共振周波数を調整することが非常に困難である、という問題があった。 The deviation of the resonance frequency from the use frequency f 0 varies according to the length of the coil unit 101. For this reason, the conventional monopole antenna 100 has a problem that it is very difficult to adjust the resonance frequency so that the impedance matching is good by resonating at the use frequency f 0 .

そこで、本発明は、上記のような問題点に着目し、インピーダンス特性を改善すると共振周波数を簡単に調整することができるモノポールアンテナを提供することを課題とする。   Accordingly, the present invention pays attention to the above-described problems, and an object thereof is to provide a monopole antenna that can easily adjust the resonance frequency by improving the impedance characteristics.

本発明者は、インピーダンス特性を改善すると共に共振周波数を簡単に調整することができるモノポールアンテナを得るべく検討を重ねた結果、コイル部を設けたモノポールアンテナ本体のコイル部側に軸方向に離間して無給電コイルを配置すると、インピーダンス特性が改善されて、共振周波数を使用周波数に近づけることができることを見出した。また、モノポールアンテナ本体と無給電コイルとの距離を調整することにより、共振周波数の調整が可能になることを見出し、本発明を完成するに至った。   As a result of repeated studies to improve the impedance characteristics and to easily adjust the resonance frequency, the present inventor has made a study in the axial direction toward the coil portion side of the monopole antenna body provided with the coil portion. It has been found that when the parasitic coil is arranged apart from each other, the impedance characteristic is improved and the resonance frequency can be brought close to the use frequency. Further, it has been found that the resonance frequency can be adjusted by adjusting the distance between the monopole antenna body and the parasitic coil, and the present invention has been completed.

即ち、請求項１記載の発明は、軸周りを囲むように螺旋状に巻回されたコイル部、及び、前記コイル部の一端に設けられた前記軸に沿った立ち上がり部、から構成された線状のモノポールアンテナ本体を有するモノポールアンテナにおいて、前記モノポールアンテナ本体のコイル部側に前記軸方向に離間して配置された前記軸周りを囲むように螺旋状に巻回された線状の無給電コイルを有することを特徴とするモノポールアンテナに存する。   That is, the invention according to claim 1 is a wire composed of a coil portion wound spirally so as to surround the axis, and a rising portion along the axis provided at one end of the coil portion. In a monopole antenna having a monopole antenna main body, a linear winding wound in a spiral manner so as to surround the axis disposed in the axial direction on the coil portion side of the monopole antenna main body. The present invention resides in a monopole antenna having a parasitic coil.

請求項２記載の発明は、前記コイル部及び前記無給電コイルが各々、密巻きコイル状に設けられていることを特徴とする請求項１又は２に記載のモノポールアンテナに存する。   According to a second aspect of the present invention, there is provided the monopole antenna according to the first or second aspect, wherein the coil portion and the parasitic coil are each provided in a closely wound coil shape.

以上説明したように請求項１記載の発明によれば、軸周りを囲むように螺旋状に巻回された線状の無給電コイルがモノポールアンテナ本体のコイル部側に軸方向に離間して配置されているので、インピーダンス特性を改善すると共振周波数を簡単に調整することができる。   As described above, according to the first aspect of the present invention, the linear parasitic coil wound spirally so as to surround the axis is separated in the axial direction on the coil portion side of the monopole antenna body. Since it is arranged, the resonance frequency can be easily adjusted by improving the impedance characteristics.

請求項２記載の発明によれば、アンテナをより一層小型化することができる。   According to the second aspect of the present invention, the antenna can be further reduced in size.

以下、本発明の一実施の形態を図面に基づいて説明する。図１及び図２に示すように、モノポールアンテナ１は、モノポールアンテナ本体２と、無給電コイル３と、を有している。モノポールアンテナ本体２は、使用波長λ0（＝光速／使用周波数ｆ0）／４の長さの導線から構成されている。モノポールアンテナ本体２は、図１中の一点鎖線で示す軸Ｚ周りを囲むように螺旋状に巻回されたコイル部２１と、コイル部２１の一端に設けられた軸Ｚに沿った立ち上がり部２２と、から構成されている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the monopole antenna 1 has a monopole antenna body 2 and a parasitic coil 3. The monopole antenna main body 2 is composed of a conducting wire having a length of use wavelength λ 0 (= light speed / use frequency f 0 ) / 4. The monopole antenna body 2 includes a coil portion 21 wound in a spiral shape so as to surround an axis Z indicated by a one-dot chain line in FIG. 1, and a rising portion along the axis Z provided at one end of the coil portion 21. 22.

上記立ち上がり部２２は、平板状の導体板４と直交するようにその端部が導体板４に接続されている。コイル部２１を設けることにより、モノポールアンテナ本体２のアンテナ長Ｌ1は、λ0／４より短くすることができ、小型化を図ることができる。無給電コイル３は、軸Ｚ周りを囲むように螺旋状に巻回された導線から構成されている。無給電コイル３は、モノポールアンテナ本体２のコイル部２１側に軸Ｚ方向に距離Ｌ2だけ離間して配置されている。 The rising portion 22 is connected to the conductor plate 4 at an end thereof so as to be orthogonal to the flat conductor plate 4. By providing the coil section 21, the antenna length L 1 of the monopole antenna body 2 may be shorter than lambda 0/4, it can be miniaturized. The parasitic coil 3 is composed of a conducting wire wound in a spiral shape so as to surround the axis Z. The parasitic coil 3 is disposed on the side of the coil portion 21 of the monopole antenna body 2 with a distance L 2 apart in the axis Z direction.

無給電コイル３は、その半径Ｒ1がコイル部２１と同じになるように巻回されている。また、上記コイル部２１及び無給電コイル３は各々、密巻きコイル状に設けられている。ここで、密巻きコイルとは、図１に示すように、導線が軸Ｚ方向に隙間無く巻回されたコイルのことをいう。上述したコイル部２１及び無給電コイル３内には、図示しない円筒状の誘電体箔の外周に巻回されて電磁界への影響の小さい粘着テープで固定されている。 The parasitic coil 3 is wound so that its radius R 1 is the same as that of the coil portion 21. In addition, the coil part 21 and the parasitic coil 3 are each provided in a tightly wound coil shape. Here, the densely wound coil means a coil in which a conducting wire is wound without gaps in the axis Z direction as shown in FIG. In the coil part 21 and the non-feed coil 3 described above, it is wound around the outer periphery of a cylindrical dielectric foil (not shown) and fixed with an adhesive tape that has little influence on the electromagnetic field.

次に、本発明者は、後述する図１に示す本発明品Ａ及びＢと、図５に示す従来品と、をそれぞれ作製して、周波数に対応するＶＳＷＲ特性を測定した。結果を、図３、図４及び図６に示す。なお、本発明品Ａは、立ち上がり部２２の長さＬ3＝０．５mm、コイル部２１及び密巻きコイル３の直径Ｒ1＝１１．７mm、コイル部２１の巻き数Ｎ1＝４回、密巻きコイル３の巻き数Ｎ2＝４．２５回としている。本発明品Ｂは、Ｌ3、Ｒ1、Ｎ1については本発明品Ａと同じ寸法とし、Ｎ2＝１回としている。従来品は、本発明品Ａ及びＢのモノポールアンテナ本体２と同じ寸法としている。また、モノポールアンテナ本体２及び無給電コイル３を構成する導線としては、例えば直径１．２mmのエナメル線を用いている。また、導体板４としては、２００mm×２００mmの銅板を用いている。 Next, the inventor manufactured the present invention products A and B shown in FIG. 1 described later and the conventional product shown in FIG. 5, and measured the VSWR characteristics corresponding to the frequency. The results are shown in FIG. 3, FIG. 4 and FIG. The product A of the present invention has a length L 3 = 0.5 mm of the rising portion 22, a diameter R 1 of the coil portion 21 and the closely wound coil 3 = 11.7 mm, and the number of turns N 1 of the coil portion 21 = 4 times. The number of turns N 2 of the closely wound coil 3 is 4.25. In the product B of the present invention, L 3 , R 1 and N 1 have the same dimensions as those of the product A of the present invention, and N 2 = 1. The conventional product has the same dimensions as the monopole antenna body 2 of the products A and B of the present invention. Moreover, as a conducting wire constituting the monopole antenna body 2 and the parasitic coil 3, for example, an enameled wire having a diameter of 1.2 mm is used. The conductor plate 4 is a 200 mm × 200 mm copper plate.

図６に示すように、共振周波数の使用周波数ｆ0からズレは、従来品が＋９０ＭＨｚであるのに対して、図３に示すように本発明品Ａがほぼ０であり、図４に示すように本発明品Ｂでも＋１２ＭＨｚ程度と低減できることが分かった。即ち、本発明品Ａ、Ｂのように無給電コイル３を設けることにより、共振周波数を使用周波数ｆ0に近づけてインピーダンス特性を改善できることが分かった。また、無給電コイル３の巻き数Ｎ2をコイル部２１の巻き数Ｎ1に近づけるほど、共振周波数が使用周波数ｆ0に近づいてインピーダンス特性を改善できることが分かった。 As shown in FIG. 6, the deviation of the resonance frequency from the use frequency f 0 is +90 MHz in the conventional product, whereas the product A of the present invention is almost 0 as shown in FIG. 3, and as shown in FIG. It was also found that the present invention product B can be reduced to about +12 MHz. That is, it was found that by providing the parasitic coil 3 as in the products A and B of the present invention, the impedance characteristic can be improved by bringing the resonance frequency close to the use frequency f 0 . Further, it has been found that the closer the number of turns N 2 of the parasitic coil 3 is to the number of turns N 1 of the coil portion 21, the closer the resonance frequency is to the use frequency f 0 and the impedance characteristics can be improved.

また、図６に示すように、共振周波数でのＶＳＲＷは、従来品が６．５であるのに対して、巻き数Ｎ2＝１回の本発明品Ｂが図４に示すように７と低減できないものの巻き数Ｎ2を増やしてコイル部２１の巻き数Ｎ1に近づけた本発明品Ａが図３に示すように１．３と低減できることが分かった。即ち、無給電コイル３の巻き数Ｎ2をコイル部２１の巻き数Ｎ1に近づけることにより、ＶＳＷＲを低減できることが分かった。 Further, as shown in FIG. 6, the VSRW at the resonance frequency is 6.5 for the conventional product, whereas the product B of the present invention B with the number of turns N 2 = 1 is 7 as shown in FIG. Although it cannot be reduced, it was found that the product A of the present invention in which the number of turns N 2 was increased to approach the number of turns N 1 of the coil portion 21 could be reduced to 1.3 as shown in FIG. That is, it was found that the VSWR can be reduced by bringing the number of turns N 2 of the parasitic coil 3 close to the number of turns N 1 of the coil portion 21.

また、本発明者は、距離Ｌ2がそれぞれ異なる図１に示す本発明品をそれぞれ作製して、周波数に対応するＶＳＲＷ特性を測定した。結果、距離Ｌ2を変えることにより共振周波数を変動できることが分かった。よって、使用周波数ｆ0を変更したい場合、距離Ｌ2を変えるだけで簡単に共振周波数を使用周波数ｆ0に調整することができる。 In addition, the present inventor manufactured the products of the present invention shown in FIG. 1 having different distances L 2 and measured the VSRW characteristics corresponding to the frequency. Result, it was found that can vary the resonance frequency by changing the distance L 2. Therefore, when it is desired to change the use frequency f 0 , the resonance frequency can be easily adjusted to the use frequency f 0 simply by changing the distance L 2 .

上述したモノポールアンテナによれば、軸Ｚ周りを囲むように螺旋状に巻回された線状の無給電コイル３がモノポールアンテナ本体２のコイル部２１側に軸Ｚ方向に離間して配置されているので、インピーダンス特性を改善すると共振周波数を簡単に調整することができる。   According to the above-described monopole antenna, the linear parasitic coil 3 wound spirally so as to surround the axis Z is arranged on the coil portion 21 side of the monopole antenna body 2 so as to be separated in the axis Z direction. Therefore, the resonance frequency can be easily adjusted by improving the impedance characteristic.

また、上述したモノポールアンテナによれば、コイル部２１及び無給電コイル３が各々、密巻きコイル状に設けられている。これにより、疎巻きコイルに比べてモノポールアンテナ本体２及び無給電コイル３を構成する導線を容易に小型に収めることができる。また、コイル部２１及び無給電コイル３を疎巻きコイル状にすると、コイル部２１と無給電コイル３との相互の結合が十分に得られ難くなりなり、共振周波数の使用周波数ｆ0からのズレも大きくなり、ＶＳＷＲもあまり低減できなくなる。また、コイル部２１から直接放射される成分（電波）が多くなり使用周波数ｆ0でのＶＳＷＲ特性が低下する。これに対して、コイル部２１及び無給電コイル３を密巻きコイル状にすることにより、コイル部２１と無給電コイル３との相互の結合が十分に得られ、共振周波数の使用周波数ｆ0からのズレも小さくなり、ＶＳＷＲも低減することができる。また、コイルから直接放射される成分を少なくして、本来の電気的特性を得ることができる。 Moreover, according to the monopole antenna mentioned above, the coil part 21 and the parasitic coil 3 are each provided in the shape of a closely wound coil. Thereby, compared with a loosely wound coil, the conducting wire which comprises the monopole antenna main body 2 and the parasitic coil 3 can be easily accommodated in a small size. In addition, if the coil part 21 and the parasitic coil 3 are formed into a loosely wound coil shape, it is difficult to obtain sufficient coupling between the coil part 21 and the parasitic coil 3, and the resonance frequency is shifted from the use frequency f 0. And VSWR cannot be reduced much. Further, the component (radio wave) directly radiated from the coil portion 21 increases, and the VSWR characteristic at the use frequency f 0 is lowered. On the other hand, by making the coil part 21 and the parasitic coil 3 into a tightly wound coil shape, mutual coupling between the coil part 21 and the parasitic coil 3 can be sufficiently obtained, and the resonance frequency from the use frequency f 0 can be obtained. And the VSWR can be reduced. In addition, the original electrical characteristics can be obtained by reducing the component directly radiated from the coil.

なお、上述した実施形態では、コイル部２１及び無給電コイル３は密巻きコイル状に設けられていたが、本発明はこれに限ったものではない。コイル部２１及び無給電コイル３としては、螺旋状に設けられていればよく、疎巻きコイル状に設けてもよい。   In the above-described embodiment, the coil portion 21 and the parasitic coil 3 are provided in a tightly wound coil shape, but the present invention is not limited to this. The coil part 21 and the parasitic coil 3 may be provided in a spiral shape, or may be provided in a loosely wound coil shape.

また、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。   Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

本発明のモノポールアンテナの一実施の形態を示す斜視図である。It is a perspective view which shows one Embodiment of the monopole antenna of this invention. （ａ）は図１に示すモノポールアンテナを構成する無給電コイルの上面図であり、（ｂ）は図１に示すモノポールアンテナを構成するモノポールアンテナ本体の下面図である。(A) is a top view of the parasitic coil which comprises the monopole antenna shown in FIG. 1, (b) is a bottom view of the monopole antenna main body which comprises the monopole antenna shown in FIG. 本発明品Ａの周波数に対するＶＳＷＲを示すグラフである。It is a graph which shows VSWR with respect to the frequency of this invention product A. FIG. 本発明品Ｂの周波数に対するＶＳＷＲを示すグラフである。It is a graph which shows VSWR with respect to the frequency of this invention product B. FIG. 従来のモノポールアンテナの一例を示す斜視図である。It is a perspective view which shows an example of the conventional monopole antenna. 図５に示す従来品であるモノポールアンテナの周波数に対するＶＳＷＲを示すグラフである。It is a graph which shows VSWR with respect to the frequency of the monopole antenna which is a conventional product shown in FIG.

符号の説明Explanation of symbols

１ モノポールアンテナ
２ モノポールアンテナ本体
３ 無給電コイル
２１ コイル部
２２ 立ち上がり部 DESCRIPTION OF SYMBOLS 1 Monopole antenna 2 Monopole antenna main body 3 Parasitic coil 21 Coil part 22 Standing part

Claims (2)

軸周りを囲むように螺旋状に巻回されたコイル部、及び、前記コイル部の一端に設けられた前記軸に沿った立ち上がり部、から構成された線状のモノポールアンテナ本体を有するモノポールアンテナにおいて、
前記モノポールアンテナ本体のコイル部側に前記軸方向に離間して配置された前記軸周りを囲むように螺旋状に巻回された線状の無給電コイルを有する
ことを特徴とするモノポールアンテナ。 A monopole having a linear monopole antenna body composed of a coil portion spirally wound around an axis and a rising portion along the axis provided at one end of the coil portion In the antenna
A monopole antenna having a linear parasitic coil wound spirally so as to surround the axis and spaced apart in the axial direction on the coil portion side of the monopole antenna body . 前記コイル部及び前記無給電コイルが各々、密巻きコイル状に設けられている
ことを特徴とする請求項１に記載のモノポールアンテナ。 The monopole antenna according to claim 1, wherein the coil portion and the parasitic coil are each provided in a closely wound coil shape.
JP2008139061A 2008-05-28 2008-05-28 Monopole antenna Expired - Fee Related JP5049877B2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6394704A (en) * 1986-10-09 1988-04-25 Masashi Mikkaichi Monopole antenna
JPH0653729A (en) * 1992-07-29 1994-02-25 Kyocera Corp Antenna
JPH10242740A (en) * 1997-02-26 1998-09-11 Nippon Antenna Co Ltd Multi-resonance antenna
JP2000196338A (en) * 1998-12-28 2000-07-14 Optex Co Ltd Three-dimensional antenna
JP2003152427A (en) * 2001-11-12 2003-05-23 Univ Nihon Small tight winding helical antenna
JP2007019572A (en) * 2005-07-05 2007-01-25 Kanai Hiroaki Densely wound helical antenna
JP2007043653A (en) * 2005-06-28 2007-02-15 Nippon Soken Inc Antenna

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6394704A (en) * 1986-10-09 1988-04-25 Masashi Mikkaichi Monopole antenna
JPH0653729A (en) * 1992-07-29 1994-02-25 Kyocera Corp Antenna
JPH10242740A (en) * 1997-02-26 1998-09-11 Nippon Antenna Co Ltd Multi-resonance antenna
JP2000196338A (en) * 1998-12-28 2000-07-14 Optex Co Ltd Three-dimensional antenna
JP2003152427A (en) * 2001-11-12 2003-05-23 Univ Nihon Small tight winding helical antenna
JP2007043653A (en) * 2005-06-28 2007-02-15 Nippon Soken Inc Antenna
JP2007019572A (en) * 2005-07-05 2007-01-25 Kanai Hiroaki Densely wound helical antenna

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