JPH06169219A - Multi-point feeding circularly polarized wave antenna - Google Patents
Multi-point feeding circularly polarized wave antennaInfo
- Publication number
- JPH06169219A JPH06169219A JP22376291A JP22376291A JPH06169219A JP H06169219 A JPH06169219 A JP H06169219A JP 22376291 A JP22376291 A JP 22376291A JP 22376291 A JP22376291 A JP 22376291A JP H06169219 A JPH06169219 A JP H06169219A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- polarized wave
- circularly polarized
- feeding
- radians
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は10〜20dBの中程度の利得と優れた円偏波
特性を単一のアンテナで実現する円偏波アンテナに関す
るものである。船舶、航空機、自動車、列車等を対象と
する移動体衛星通信では、利得が10数dB程度の円偏
波アンテナが求められている。通常よく用いられるクロ
スダイポールや円偏波のマイクロストリップアンテナ単
体では利得が低すぎるので、一般にはこれらを多数配列
し、アレーアンテナとして用いることが多い。高利得を
得るにはアレーアンテナは適していると言えるが、中利
得の場合には構造が複雑であり、コスト高になるという
欠点がある。単体で必要な利得を確保し、かつ、円偏波
特性のよいアンテナを簡易に実現できればその利用価値
は高いと考えられる。本発明は、複数個のアンテナ素子
を一定角度で回転して配置し、かつ、回転に応じた位相
偏移を与えることにより、ボアサイト方向に完全な円偏
波を放射させる、いわゆるシーケンシャルアレーの原理
を単体のアンテナに適用したもので、中程度の利得を持
つ簡易な円偏波アンテナを実現することができる。以
下、実施例によって、詳細に説明する。第1図(a),
(b)は、本発明の第1の実施例で、アンテナが回転対
称な場合である。この実施例におけるアンテナはマイク
ロストリップ円板パッチアンテナを背面から4点給電し
た場合である。第1図(a)は円板パッチアンテナを電
波が放射される側から見た図であり、また、同図(b)
は給電回路の構成を示したもので、1はパッチアンテ
ナ、Oはその中心、2はアンテナ基板、F−1,・・,
F−4は給電点、3−1,・・,3−4は給電線路、4
は電力分配器、5は入・出力端子である。この例では、
F−1,・・,F−4は順次π/4ラジアンずつ中心O
の回りに回転した位置にあり、かつ、給電線3−1,・
・3−4の相対位相は順にπ/4ラジアンずつ偏移する
ようになっているので、このアンテナからボアサイト方
向には完全な円偏波(図では左旋円偏波)が放射され
る。このアンテナは1点給電や2点給電のパッチアンテ
ナに比べ、軸比、インピーダンス特性ともはるかに広帯
域となる。次に第2の実施例につき説明する。これは次
の第3の実施例と同様、アンテナ構造がボアサイト軸の
回りの回転に対して周期性がある場合の例である。第2
図はマイクロストリップアンテナで構成した例で、アン
テナは60°周期の花びら状の形状をしている。この場
合に、各給電点の位相は60°ずつ偏移するように設定
される。このような構成にすると、シーケンシャルアレ
ーの原理によって円偏波アンテナが得られるが、アンテ
ナは放射効率の点からあまり大きくできないので利得に
は限界があり、通常アンテナの周囲長は数波長程度であ
る。この図には給電系の構成は特に示していないが、通
常は、第1図(b)のような給電系をマイクロストリッ
プ線路によってアンテナの背面に形成する。以上は、マ
イクロストリップアンテナのような板状アンテナの実施
例であるが、本発明は線状アンテナにも適用できる。第
3図は正六角形の線状アンテナを多点給電したときの一
実施例で、この図で6は導体棒で構成した正六角形のア
ンテナである。一辺の長さは半波長〜数波長である。B
−1,・・・B−6は同軸給電線と各放射導体との平衡
−不平衡モード変換を行うためのバランである。給電線
3−1、・・3−6は60°ずつの位相偏移を与えるよ
うにその長さが調節されている。この場合にも、シーケ
ンシャルアレーの原理よって円偏波アンテナを得ること
ができる。なお、この例では形状が正六角形であるが、
他の正多角形でもこのようなアンテナを実現できること
は言うまでもない。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circular polarization antenna that realizes a medium gain of 10 to 20 dB and excellent circular polarization characteristics with a single antenna. In mobile satellite communications for ships, aircraft, automobiles, trains, etc., a circularly polarized antenna with a gain of about 10 dB is required. Since a single cross dipole or circularly polarized microstrip antenna, which is commonly used, has too low a gain, many of them are generally arrayed and used as an array antenna. Although an array antenna is suitable for obtaining high gain, it has a drawback that the structure is complicated and the cost is high in the case of medium gain. If the required gain can be secured by itself and an antenna with good circular polarization characteristics can be easily realized, its utility value is considered to be high. The present invention arranges a plurality of antenna elements by rotating them at a constant angle, and gives a phase shift according to the rotation to radiate complete circular polarization in the boresight direction, that is, a so-called sequential array. By applying the principle to a single antenna, a simple circular polarization antenna with a medium gain can be realized. Hereinafter, the details will be described with reference to examples. Figure 1 (a),
(B) is the first embodiment of the present invention, in which the antenna is rotationally symmetrical. The antenna in this embodiment is a case where a microstrip disk patch antenna is fed from four points from the back surface. FIG. 1 (a) is a view of the disk patch antenna as seen from the side from which radio waves are radiated, and FIG. 1 (b) is the same.
Shows the structure of the feeding circuit, 1 is a patch antenna, O is its center, 2 is an antenna substrate, F-1 ,.
F-4 is a feeding point, 3-1, ..., 3-4 are feeding lines, 4
Is a power distributor, and 5 is an input / output terminal. In this example,
F-1, ..., F-4 are centered by π / 4 radians in sequence
It is in a position rotated around the
-Since the relative phase of 3-4 is sequentially shifted by π / 4 radians, perfect circular polarization (left-hand circular polarization in the figure) is radiated from this antenna in the boresight direction. This antenna has a much wider band in terms of axial ratio and impedance characteristics than a patch antenna with one-point feeding or two-point feeding. Next, a second embodiment will be described. This is an example in which the antenna structure has periodicity with respect to the rotation around the boresight axis, as in the third embodiment. Second
The figure shows an example of a microstrip antenna, which has a petal-like shape with a period of 60 °. In this case, the phase of each feeding point is set to deviate by 60 °. With such a configuration, a circularly polarized antenna can be obtained by the principle of the sequential array, but the antenna cannot be made too large in terms of radiation efficiency, so there is a limit to the gain, and the perimeter of the antenna is usually several wavelengths. . Although the structure of the power feeding system is not particularly shown in this figure, the power feeding system as shown in FIG. 1B is usually formed on the back surface of the antenna by a microstrip line. The above is an embodiment of a plate antenna such as a microstrip antenna, but the present invention can also be applied to a linear antenna. FIG. 3 shows an embodiment in which a regular hexagonal linear antenna is fed at multiple points. In this figure, 6 is a regular hexagonal antenna composed of conductor rods. The length of one side is a half wavelength to several wavelengths. B
-1, ... B-6 are baluns for performing balanced-unbalanced mode conversion between the coaxial feeder and each radiation conductor. The lengths of the feeder lines 3-1, ... 3-6 are adjusted so as to give a phase shift of 60 °. Also in this case, a circular polarization antenna can be obtained by the principle of the sequential array. In this example, the shape is a regular hexagon,
It goes without saying that such an antenna can be realized with other regular polygons.
第1図は、本発明の第1の実施例である回転対称形状の
多点給電アンテナを示す図で、(a)は放射部の斜視
図、(b)は給電部の構成を示す図、第2図は周期性の
ある形状のアンテナのうち、板状アンテナの実施例を示
す正面図、第3図は周期性のあるアンテナのうち、線状
アンテナの実施例を示す図である。 1・・・・放射素子、2・・・・アンテナ基板、3−
1,・・・3−6・・・・給電線、4・・・・電力分配
器、5・・・・入・出力端子、6・・・・線状アンテ
ナ、F−1,・・・F−6・・・・給電点、B−1,・
・・B−6・・・・バラン。 なお、図中、同一あるいは相当部分には同一符号を付し
て示してある。FIG. 1 is a diagram showing a rotationally symmetric multi-point feeding antenna according to a first embodiment of the present invention, in which (a) is a perspective view of a radiating portion and (b) is a diagram showing a configuration of a feeding portion. FIG. 2 is a front view showing an embodiment of a plate antenna among the antennas having a periodic shape, and FIG. 3 is a view showing an embodiment of a linear antenna among the antennas having a periodicity. 1 ... Radiation element, 2 ... Antenna substrate, 3-
1, ... 3-6 ... ・ Feeding line, 4 ... Power distributor, 5 ... Input / output terminal, 6 ... Linear antenna, F-1, ... F-6 ... ・ Feeding point, B-1, ・
・ ・ B-6 ・ ・ ・ ・ Balun. In the drawings, the same or corresponding parts are designated by the same reference numerals.
Claims (1)
ン(N≧3の整数)の周期性を有する形状の板状または
線状のアンテナにおいて、これにN個の給電点を設け、
それらを順次π/Nラジアンまたは2π/Nラジアンず
つボアサイト軸の回りに回転して配置し、かつ、それら
の位相を給電点の回転角に応じて、それぞれπ/Nラジ
アンまたは2π/Nラジアンずつ偏移させて給電するこ
とを特徴とする円偏波アンテナ。In a plate-like or linear antenna having a shape having rotational symmetry around the boresight axis or periodicity of 2π / N radians (an integer of N ≧ 3), N feeding points are provided in the antenna.
They are sequentially arranged by rotating around the boresight axis by π / N radians or 2π / N radians, and their phases are π / N radians or 2π / N radians, respectively, depending on the rotation angle of the feeding point. A circularly polarized wave antenna that is characterized by shifting each of them and feeding power.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22376291A JPH06169219A (en) | 1991-05-27 | 1991-05-27 | Multi-point feeding circularly polarized wave antenna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22376291A JPH06169219A (en) | 1991-05-27 | 1991-05-27 | Multi-point feeding circularly polarized wave antenna |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58051498A Division JPS59178002A (en) | 1983-03-29 | 1983-03-29 | Circularly polarized wave antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06169219A true JPH06169219A (en) | 1994-06-14 |
Family
ID=16803317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22376291A Pending JPH06169219A (en) | 1991-05-27 | 1991-05-27 | Multi-point feeding circularly polarized wave antenna |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06169219A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997032355A1 (en) * | 1996-03-01 | 1997-09-04 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
US6078294A (en) * | 1996-03-01 | 2000-06-20 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
CN106654561A (en) * | 2016-12-30 | 2017-05-10 | 中国人民解放军军械工程学院 | High-gain ultra-wideband directional antenna of origin symmetric structure |
CN106654536A (en) * | 2016-12-30 | 2017-05-10 | 中国人民解放军军械工程学院 | Dual-band high-gain directional antenna with structure symmetric about original point |
WO2021140738A1 (en) * | 2020-01-06 | 2021-07-15 | 原田工業株式会社 | Power feeder circuit for circularly polarized antenna |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS538546A (en) * | 1976-07-13 | 1978-01-26 | Mitsubishi Electric Corp | Circular array antenna |
JPS59178002A (en) * | 1983-03-29 | 1984-10-09 | Radio Res Lab | Circularly polarized wave antenna |
-
1991
- 1991-05-27 JP JP22376291A patent/JPH06169219A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS538546A (en) * | 1976-07-13 | 1978-01-26 | Mitsubishi Electric Corp | Circular array antenna |
JPS59178002A (en) * | 1983-03-29 | 1984-10-09 | Radio Res Lab | Circularly polarized wave antenna |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997032355A1 (en) * | 1996-03-01 | 1997-09-04 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
US6078294A (en) * | 1996-03-01 | 2000-06-20 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
CN106654561A (en) * | 2016-12-30 | 2017-05-10 | 中国人民解放军军械工程学院 | High-gain ultra-wideband directional antenna of origin symmetric structure |
CN106654536A (en) * | 2016-12-30 | 2017-05-10 | 中国人民解放军军械工程学院 | Dual-band high-gain directional antenna with structure symmetric about original point |
CN106654561B (en) * | 2016-12-30 | 2019-07-16 | 中国人民解放军军械工程学院 | A kind of center of circle symmetrical structure high-gain ultra wide band directional aerial |
CN106654536B (en) * | 2016-12-30 | 2019-07-16 | 中国人民解放军军械工程学院 | A kind of center of circle symmetrical structure two-band gain directional antenna |
WO2021140738A1 (en) * | 2020-01-06 | 2021-07-15 | 原田工業株式会社 | Power feeder circuit for circularly polarized antenna |
JP2021111813A (en) * | 2020-01-06 | 2021-08-02 | 原田工業株式会社 | Power supply circuit for circularly polarized antenna |
CN115023857A (en) * | 2020-01-06 | 2022-09-06 | 原田工业株式会社 | Feed circuit for circularly polarized antenna |
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