JP2514203Y2 - Circular linear polarization converter - Google Patents
Circular linear polarization converterInfo
- Publication number
- JP2514203Y2 JP2514203Y2 JP1987070599U JP7059987U JP2514203Y2 JP 2514203 Y2 JP2514203 Y2 JP 2514203Y2 JP 1987070599 U JP1987070599 U JP 1987070599U JP 7059987 U JP7059987 U JP 7059987U JP 2514203 Y2 JP2514203 Y2 JP 2514203Y2
- Authority
- JP
- Japan
- Prior art keywords
- linear polarization
- circular
- flat
- polarization converter
- portions
- 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.)
- Expired - Lifetime
Links
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 この考案は、パラボラアンテナ等の円偏波１次放射器
の円−直線偏波変換器に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a circular-linear polarization converter of a circularly polarized primary radiator such as a parabolic antenna.
〈従来技術〉 従来、上記の円−直線偏波変換器には、例えば第７図
及び第８図に示すように、円形導波管２の内周面に取り
出そうとしている直線偏波方向と45°の角度をなすよう
に一対の対向する平面部４、４を設け、その縦断面形状
が長円形となるようにしたものがあつた。このような円
−直線偏波変換器は、平面部４、４を設けた部分で、例
えば第８図の左端から入来した円偏波を構成している振
幅が等しく位相が90°異なる２つの直線偏波の一方の位
相を90°ずらせて、直線偏波に変換する。<Prior Art> Conventionally, in the above-mentioned circular-linear polarization converter, for example, as shown in FIGS. 7 and 8, a linear polarization direction to be extracted on the inner peripheral surface of the circular waveguide 2 is used. In some cases, a pair of opposing flat portions 4 and 4 are provided so as to form an angle of 45 °, and the vertical cross-sectional shape thereof is an ellipse. Such a circular-linear polarization converter is a portion provided with the plane portions 4 and 4, for example, a circularly polarized wave coming from the left end of FIG. The phase of one of the two linearly polarized waves is shifted by 90 ° and converted to a linearly polarized wave.
〈考案が解決しようとする問題点〉 このような円−直線偏波変換器は、アルミダイキヤス
ト等によつて一体成型できるという利点があるが、平面
部４、４を設けた部分と設けていない部分とでは断面形
状が異なり、平面部４、４の両端部の立上り部分が、円
偏波の電波の伝搬方向に対して部分的な壁となり、平面
部４、４を設けた部分と設けていない部分とでは大きく
インピーダンスが変化して、不整合が生じてVSWR特性が
悪化するという問題点があった。また、特公昭57-23443
号の第４図及び第５図には、第９図（ａ）、（ｂ）に示
すようなインピーダンス変換器50が開示されている。こ
のインピーダンス変換器50は、円形導波管52の内面に、
上述した平面部４、４と同様な平面部54、54を形成し、
これら平面部54の両端部にインピーダンス変換器50とし
て、テーパ面を形成したものである。但し、このテーパ
面の形状は、明確には示されていない。<Problems to be solved by the invention> Such a circular-linear polarization converter has an advantage that it can be integrally molded with an aluminum die cast or the like, but it is provided with a portion where the plane portions 4 and 4 are provided. The cross-sectional shape is different from that of the non-existing portion, and the rising portions at both ends of the flat portions 4 and 4 serve as partial walls in the propagation direction of the circularly polarized radio wave, and are provided with the portion where the flat portions 4 and 4 are provided. There is a problem that the VSWR characteristics are deteriorated due to a large impedance change between the unfilled part and the mismatch. Also, Japanese Examined Japanese Examined Sho 57-23443
FIGS. 4 and 5 of the publication disclose an impedance converter 50 as shown in FIGS. 9 (a) and 9 (b). This impedance converter 50 is provided on the inner surface of the circular waveguide 52,
Forming flat parts 54, 54 similar to the flat parts 4, 4 described above,
Tapered surfaces are formed as impedance converters 50 at both ends of the flat surface portion 54. However, the shape of this tapered surface is not clearly shown.
仮に、特公昭33-8573号公報の第１図（ｃ）に示され
ているような、即ち同図（ｃ）に示すような形状である
とすると、このテーパ面50の最外方点56での幅寸法は零
であり、平面部54に向かうに従って幅寸法が広くなり、
最終的には平面部54の幅寸法と同一の幅寸法となる。If the shape is as shown in FIG. 1 (c) of Japanese Patent Publication No. 33-8573, that is, as shown in FIG. 1 (c), the outermost point 56 of this tapered surface 50 is shown. The width dimension at is zero, and the width dimension becomes wider toward the flat surface portion 54,
Eventually, the width will be the same as the width of the flat portion 54.
このようなインピーダンス変換器50では、その外方点
56において平面部54と極端にインピーダンスが異なる不
整合の問題を生じ、上述した従来のものと同様にVSWR特
性が悪化するという問題点があった。In such an impedance converter 50, the external point
In the case of 56, there is a problem of mismatching in which the impedance is extremely different from that of the plane portion 54, and the VSWR characteristic is deteriorated as in the conventional case described above.
〈問題点を解決するための手段〉 この考案は、円形導波管の両端部の内周面に、その軸
線に対して垂直な断面形状が所定角度傾斜した長円とな
る状態に所定の厚さ寸法を有する１対の平面部を平行に
設け、これら平面部の両端部に変換部を設け、この変換
部は、上記平面部の両端において上記平面部の幅寸法に
等しい幅寸法を有すると共に厚さ寸法を零とし、上記平
面部の両端よりも内奥の最終点において零となるように
上記幅寸法を徐々に減少させ、厚さ寸法が上記最終点に
おいて上記平面部の厚さ寸法となるように徐々に増加さ
せた半円錐状に、上記平面部の両端部をそれぞれ除去し
てなるものである。<Means for Solving the Problems> This invention is directed to an inner peripheral surface of both ends of a circular waveguide in which a cross-sectional shape perpendicular to an axis thereof has a predetermined thickness in a state of being an ellipse inclined at a predetermined angle. A pair of flat portions having a flat dimension are provided in parallel, conversion portions are provided at both ends of the flat portions, and the conversion portions have a width dimension equal to a width dimension of the flat portion at both ends of the flat portion. The thickness dimension is set to zero, and the width dimension is gradually reduced so that it becomes zero at the final point inside the both ends of the plane portion, and the thickness dimension is equal to the thickness dimension of the plane portion at the final point. Both end portions of the plane portion are removed in a semi-conical shape gradually increased so that
〈作用・効果〉 この考案によれば、変換部は、円形導波管との接続部
において幅寸法が平面部の幅寸法と一致し、かつ厚さが
零であるので、円形導波管のインピーダンスに等しいイ
ンピーダンスを有し、完全に整合している。そして、変
換部の最終点において、幅寸法が零であり、厚さ寸法は
平面部の厚さ寸法は平面部の厚さ寸法と一致している。
そして、変換部と円形導波管との接続部から最終点ま
で、幅寸法と厚さ寸法が徐々に変化しているので、イン
ピーダンスが滑らかに変化する。特に、除去されている
部分の幅寸法を徐々に減少させているのが、インピーダ
ンスを滑らかに変化させるのに貢献する。従つて、不整
合は生じず、VSWR特性を改善できる。このように、この
考案によれば、一体成型できるというメリツトをいかし
つつ、VSWR特性を改善できる。<Operation / Effect> According to the present invention, since the width of the converter is the same as the width of the flat part at the connecting part with the circular waveguide and the thickness is zero, the conversion part of the circular waveguide is It has an impedance equal to the impedance and is perfectly matched. At the final point of the conversion portion, the width dimension is zero, and the thickness dimension of the flat portion matches the thickness dimension of the flat portion.
Since the width dimension and the thickness dimension gradually change from the connecting portion between the conversion portion and the circular waveguide to the final point, the impedance changes smoothly. In particular, gradually reducing the width dimension of the removed portion contributes to a smooth change in impedance. Therefore, no mismatch occurs and VSWR characteristics can be improved. As described above, according to this invention, VSWR characteristics can be improved while taking advantage of the advantage that they can be integrally molded.
〈実施例〉 この実施例は、第４図に示すようにオフセツトパラボ
ラ反射鏡10と共に用いられる１次放射器12の円−直線偏
波変換器14にこの考案を実施したものである。同図にお
いて、16は低雑音ブロツクコンバータで、１次放射器12
と取付けられている。18はアームで、低雑音ブロツクコ
ンバータ16と１次放射器12とをオフセツトパラボラ反射
鏡10に取付けるためのものである。20は支柱で、オフセ
ツトパラボラ反射鏡10を支持するためのものである。<Embodiment> In this embodiment, the present invention is applied to a circular-linear polarization converter 14 of a primary radiator 12 used with an offset parabolic reflector 10 as shown in FIG. In the figure, 16 is a low noise block converter, and the primary radiator 12
Installed with. Reference numeral 18 denotes an arm for attaching the low noise block converter 16 and the primary radiator 12 to the offset parabolic reflector 10. The column 20 is for supporting the offset parabolic reflector 10.
第３図に示すように、１次放射器12は、ホーン部22、
円−直線偏波変換器14、吸収抵抗部24及び変成器26から
なる。ホーン部22でピツクアツプされた円偏波の電波
は、円−直線偏波変換器14によつて直線偏波に変換さ
れ、変成器26を介して出力される。一方、交差偏波成分
は、吸収抵抗部24の抵抗シート板28によつて吸収され
る。As shown in FIG. 3, the primary radiator 12 includes a horn portion 22,
It is composed of a circular-linear polarization converter 14, an absorption resistance section 24, and a transformer 26. The circularly polarized radio wave picked up by the horn section 22 is converted into a linearly polarized wave by the circular-linear polarization converter 14 and output through the transformer 26. On the other hand, the cross polarization component is absorbed by the resistance sheet plate 28 of the absorption resistance section 24.
円−直線偏波変換器14は、第１図及び第２図に示すよ
うに、円形導波管30の内周面に従来のものと同様に平面
部32、32を有している。この平面部32、32は、垂直軸に
対して45°傾斜して対向するように設けられており、所
定の厚さを有している。これによつて平面部32、32が設
けられている部分の軸線に沿つて直角な断面は傾斜した
長円状をなしている。As shown in FIGS. 1 and 2, the circular-linear polarization converter 14 has flat portions 32, 32 on the inner peripheral surface of the circular waveguide 30 as in the conventional case. The plane portions 32, 32 are provided so as to face each other with an inclination of 45 ° with respect to the vertical axis, and have a predetermined thickness. As a result, the cross section perpendicular to the axis of the portion where the flat portions 32, 32 are provided has an elliptical shape inclined.
これら平面部32、32の両端部には、それぞれインピー
ダンス変換部34、34が設けられている。これらインピー
ダンス変換部34は、平面部32、32の両端部に形成した斜
面を半円錐状に切り取った形状をなしている。即ち、こ
の変換部32と円形導波管30の端部との接続部では、平面
部32の幅寸法に等しい幅寸法を有し、厚さ寸法が零であ
り、平面部の他方の端部に向かうに従って幅寸法が徐々
に零に向かって減少し、厚さ寸法が平面部32の厚さ寸法
に向かって徐々に増加する半円錐状に除去されている。Impedance converters 34 and 34 are provided at both ends of the flat portions 32 and 32, respectively. These impedance converters 34 have a shape in which the slopes formed at both ends of the flat surfaces 32, 32 are cut into a semi-conical shape. That is, the connecting portion between the conversion portion 32 and the end portion of the circular waveguide 30 has a width dimension equal to the width dimension of the flat portion 32, the thickness dimension is zero, and the other end portion of the flat portion is The width dimension gradually decreases toward 0, and the thickness dimension is gradually removed toward the thickness dimension of the flat portion 32 in a semi-conical shape.
従って、この変換部34、34における導波管30の端部に
接している部分のイピンーダンスは、導波管30の端部の
インピーダンスに等しく、平面部32側に向かうに従つて
インピーダンスは変化し、平面部32に接している部分の
インピーダンスは平面部32のインピーダンスに等しくな
る。従つて、インピーダンスの不整合は生じず、VSWRが
改善される。Therefore, the impedance of the portion of the converters 34, 34 in contact with the end of the waveguide 30 is equal to the impedance of the end of the waveguide 30, and the impedance changes as it goes toward the flat surface 32. The impedance of the portion in contact with the plane portion 32 becomes equal to the impedance of the plane portion 32. Therefore, no impedance mismatch occurs and VSWR is improved.
この点について、この考案による円−直線偏波変換器
を備える１次放射器を製作し、オフセツトパラボラ反射
鏡に取付け、VSWRを測定し、併せて交差偏波保護比も測
定した。また、比較のため第７図及び第８図に示した従
来の円−直線偏波変換器を備えた１次放射器をオフセツ
トパラボラ反射鏡に取付け、VSWR及び交差偏波保護比も
測定した。測定結果を第５図及び第６図に示す。両図に
おいて実線で示したものがこの考案による円−直線偏波
変換器を備えたもの、点線が従来の円−直線偏波変換器
を備えたものである。両図から判るように、この考案に
よるものの方がVSWR及び交差偏波保護比共に従来のもの
よりも改善されている。特にVSWR特性は使用周波数帯域
（500MHz）全域にわたつて1.1以下と非常に良好になつ
た。なお、この考案によるもの及び従来のものも、共に
円−直線偏波変換器の円形導波管の内径Ｄ1は0.88λ
（λは自由空間波長）とし、平面部間の距離Ｄ2は0.7λ
とし、平面部の長さＬ2は、設計周波数（12GHz帯）にお
いて最良の長さとなるように、この考案のものでは1.28
λ、従来のものでは1.72λとし、この考案によるものの
変換部の長さＬ1は0.62λとした。また、測定に用いた
オフセツトパラボラ反射鏡は短径が75cmのものである。Regarding this point, a primary radiator equipped with a circular-linear polarization converter according to the present invention was manufactured, mounted on an offset parabolic reflector, and VSWR was measured, and also cross polarization protection ratio was measured. For comparison, the primary radiator equipped with the conventional circular-linear polarization converter shown in FIGS. 7 and 8 was attached to the offset parabolic reflector, and VSWR and cross polarization protection ratio were also measured. . The measurement results are shown in FIGS. 5 and 6. In both figures, the solid line shows the one provided with the circular-linear polarization converter according to the present invention, and the dotted line shows the one provided with the conventional circular-linear polarization converter. As can be seen from both figures, the VSWR and the cross polarization protection ratio of the present invention are improved over the conventional one. In particular, the VSWR characteristics were very good at 1.1 or less over the entire frequency band used (500MHz). In both the device according to the present invention and the conventional device, the circular waveguide of the circular-linear polarization converter has an inner diameter D 1 of 0.88λ.
(Λ is a free space wavelength), and the distance D 2 between the flat portions is 0.7λ
In the present invention, the length L 2 of the flat portion is 1.28 so that it becomes the best length at the design frequency (12 GHz band).
lambda, than the conventional and 1.72Ramuda, the length L 1 of the conversion of the by this invention was 0.62Ramuda. The offset parabolic reflector used for the measurement has a short axis of 75 cm.
第１図はこの考案による円−直線偏波変換器の１実施例
の正面図、第２図は第１図のＡ−Ａ線に沿う断面図、第
３図はこの実施例の円−直線偏波変換器を用いた１次放
射器の縦断面組立図、第４図は第３図の１次放射器を備
えたオフセツトパラボラアンテナの斜視図、第５図はこ
の実施例の円−直線偏波変換器と従来の円−直線偏波変
換器との交差偏波保護比特性図、第６図はこの実施例の
円−直線偏波変換器と従来の円−直線偏波変換器とのVS
WR特性図、第７図は従来の円−直線偏波変換器の正面
図、第８図は第７図のＢ−Ｂ線に沿う断面図、第９図は
別の従来の円−直線偏波変換器を示す図である。 30……円形導波管、32……平面部、34……変換部。FIG. 1 is a front view of one embodiment of a circular-linear polarization converter according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a circle-linear of this embodiment. Fig. 4 is a vertical sectional assembly view of a primary radiator using a polarization converter, Fig. 4 is a perspective view of an offset parabolic antenna equipped with the primary radiator of Fig. 3, and Fig. 5 is a circle of this embodiment. Cross polarization protection ratio characteristic diagram of the linear polarization converter and the conventional circle-linear polarization converter. FIG. 6 shows the circle-linear polarization converter of this embodiment and the conventional circle-linear polarization converter. VS with
WR characteristic diagram, FIG. 7 is a front view of a conventional circular-linear polarization converter, FIG. 8 is a sectional view taken along the line BB of FIG. 7, and FIG. 9 is another conventional circular-linear polarization converter. It is a figure which shows a wave converter. 30 ... Circular waveguide, 32 ... Planar section, 34 ... Converter section.
Claims (1)
に対して垂直な断面形状が所定角度傾斜した長円となる
状態に所定の厚さ寸法を有する１対の平面部を平行に設
け、これら平面部の両端部に変換部を設け、この変換部
は、上記平面部の両端において上記平面部の幅寸法に等
しい幅寸法を有すると共に厚さ寸法を零とし、上記平面
部の両端よりも内奥の最終点において零となるように上
記幅寸法を徐々に減少させ、厚さ寸法が上記最終点にお
いて上記平面部の厚さ寸法となるように徐々に増加させ
た半円錐状に、上記平面部の両端部をそれぞれ除去して
なる円−直線偏波変換器。1. A pair of flat parts having a predetermined thickness dimension on the inner peripheral surfaces of both ends of a circular waveguide in a state where a cross-sectional shape perpendicular to an axis thereof is an ellipse inclined at a predetermined angle. Are provided in parallel, and the conversion portions are provided at both ends of the flat surface portions. The conversion portions have width dimensions equal to the width dimensions of the flat surface portions at both ends of the flat surface portion and have a thickness dimension of zero, and The width dimension is gradually reduced so that it becomes zero at the final point inward of both ends of the section, and the thickness dimension is gradually increased so as to become the thickness dimension of the flat section at the final point. A circular-linear polarization converter obtained by removing both end portions of the flat surface portion in a conical shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987070599U JP2514203Y2 (en) | 1987-05-11 | 1987-05-11 | Circular linear polarization converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987070599U JP2514203Y2 (en) | 1987-05-11 | 1987-05-11 | Circular linear polarization converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63178901U JPS63178901U (en) | 1988-11-18 |
| JP2514203Y2 true JP2514203Y2 (en) | 1996-10-16 |
Family
ID=30912382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987070599U Expired - Lifetime JP2514203Y2 (en) | 1987-05-11 | 1987-05-11 | Circular linear polarization converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2514203Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023464B2 (en) * | 1980-06-10 | 1985-06-07 | 富士通株式会社 | gas discharge panel |
-
1987
- 1987-05-11 JP JP1987070599U patent/JP2514203Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63178901U (en) | 1988-11-18 |
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