JPH024493Y2 - - Google Patents
Info
- Publication number
- JPH024493Y2 JPH024493Y2 JP1984161251U JP16125184U JPH024493Y2 JP H024493 Y2 JPH024493 Y2 JP H024493Y2 JP 1984161251 U JP1984161251 U JP 1984161251U JP 16125184 U JP16125184 U JP 16125184U JP H024493 Y2 JPH024493 Y2 JP H024493Y2
- Authority
- JP
- Japan
- Prior art keywords
- horn
- spherical
- antenna
- spherical part
- protrusion
- 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
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 7
- 239000000057 synthetic resin Substances 0.000 claims description 7
- 210000003323 beak Anatomy 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 241000271566 Aves Species 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 241000272201 Columbiformes Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
Landscapes
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案はオフセツトパラボラアンテナ(以下反
射鏡という)に用いられるフイドーム付アンテナ
ホーンに関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antenna horn with a feedome used in an offset parabolic antenna (hereinafter referred to as a reflector).
この種のフイドーム付アンテナホーン21は、
第3図に示すように円偏波直線偏波変換器22、
周波数変換器23を伴つて屋外に設置された反射
鏡24の焦点箇所に配置されているが、一般にそ
の向きが上向きとなるため雨水、じんあい等が入
らないように第4図に示すものはフイードホーン
25の開口端に膜26を取付け、又、第5図に示
すものはアンテナ一次ホーン27の開口端に膜2
8を取付けている。このような膜を一般にフイド
ームという。フイドームは誘電率、耐熱性、耐候
性の良い材質で肉厚は波長に対して十分に小さい
値にとつており、一般にテフロン製フアツプリツ
ク、プラスチツクフイルム等が用いられている。
This type of antenna horn 21 with a feed dome is
As shown in FIG. 3, a circular polarization linear polarization converter 22,
It is placed at the focal point of a reflector 24 installed outdoors together with a frequency converter 23, but since its direction is generally upward, the one shown in Fig. 4 is designed to prevent rainwater, dust, etc. from entering. A membrane 26 is attached to the open end of the feed horn 25, and the membrane 26 is attached to the open end of the antenna primary horn 27 in the case shown in FIG.
8 is installed. Such a membrane is generally called a phydome. The film dome is made of a material with good dielectric constant, heat resistance, and weather resistance, and its wall thickness is set to a sufficiently small value relative to the wavelength, and Teflon fabric, plastic film, etc. are generally used.
上記するような膜26,28は平坦で薄肉であ
つたから鳥類、特に鳥、鳩等のくちばしで破ら
れ、浸水等で受信不能となることがあつた。
Since the membranes 26 and 28 described above were flat and thin, they could be torn by the beaks of birds, especially birds, pigeons, etc., and reception could become impossible due to flooding.
又、オフセツトパラボラアンテナ受信装置で
は、第3図に示す如く反射鏡24は電波到来方向
に向けると立つた状態となり、特に寒冷地では静
止放送衛星からの電波到来方向の仰角が地平線上
に近づくため一層起立して反射鏡24への積雪は
殆どないが、反射鏡24の焦点にあるアンテナホ
ーン21は逆に上向きとなるため、第4図及び第
5図に示す如く鍔付ナツト29の内周側段部30
によつて膜26,28上の雪31が支持されこの
雪でアンテナ特性が劣化する。 In addition, in the offset parabolic antenna receiving device, as shown in FIG. 3, the reflector 24 is in an upright position when facing the direction in which the radio waves arrive, and especially in cold regions, the angle of elevation of the direction in which the radio waves arrive from the geostationary broadcasting satellite approaches the horizon. As a result, the antenna horn 21 at the focal point of the reflector 24 is oriented upward, so the inner part of the flanged nut 29 is exposed as shown in FIGS. 4 and 5. Circumferential stepped portion 30
The snow 31 on the membranes 26 and 28 is supported by the snow, and this snow deteriorates the antenna characteristics.
又、現在の静止放送衛星は春分、秋分の前後の
日の午後2時頃の太陽の方向にあるため、この時
間帯には反射鏡24で反射した太陽は焦点に集ま
るが、従来の膜26,28はこの焦点に近いため
相当高温となり、破損する等の問題があつた。 Furthermore, since current geostationary broadcasting satellites are located in the direction of the sun at around 2:00 pm on days before and after the vernal and autumnal equinoxes, the sun reflected by the reflector 24 is focused at the focal point during these times, but the conventional membrane 26 , 28 are close to this focal point, so they become quite hot, causing problems such as breakage.
〔問題点を解決するための手段〕
上記するような問題点を解決するため本考案に
おいては、略円筒状をなす突出し部の後端にフラ
ンジ部を突設すると共に前端を球面部分で覆着し
てなる硬質合成樹脂製のフイドームを、そのフラ
ンジ部でオフセツトパラボラアンテナ用ホーンの
開口端に装着し、且つ、この装着状態にてホーン
の円錐内面の母線の延長線が突出し部の前端近傍
の球面部分を通るようにしたことを特徴とするも
のである。[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a flange portion is provided protruding from the rear end of the approximately cylindrical protrusion, and the front end is covered with a spherical portion. A field made of hard synthetic resin is attached at its flange to the open end of the horn for an offset parabolic antenna, and in this attached state, the extension line of the generatrix of the conical inner surface of the horn is near the front end of the protrusion. It is characterized by passing through the spherical part of.
本考案においては、アンテナ用ホーンの前面に
硬質合成樹脂製の球面部分が位置するように反射
鏡に取付けており、平板状のものより一段と強度
が大となる球面部分は鳥類がくちばしでつついて
もつつく方向が球面部分の曲率半径よりずれると
くちばしが滑るため損傷されない。又、静止放送
衛星が太陽の方向にあると反射鏡で反射した太陽
光は焦点に集まるが、球面部分はホーン前端から
突出し部を経てさらに前方へ突き出ていて焦点よ
りかなり離れた位置で太陽光を受け、しかも球面
状を呈することにより平坦なものに比べ単位面積
当りの受熱量が格段に少くなるから、球面部分の
温度上昇をかなり低く押えることができる。又、
球面部分は反射鏡からの電波到来方向に略直角な
形状であるから、放射電力密度が平坦なものに比
べ均一化され、さらに球面部分はホーンの円錐内
面の母線の延長線が突出し部の前端近傍の球面部
分を通る大きさとしているから、球面部分に対す
る球面波の入射角が一様に小さくなる。しかし
て、フイドームをホーン開口端に取付ける取付具
の下部は球面部分及び突出し部にかくれてフイド
ーム上の雪を下方から支持できないため、球面部
分に積雪がないため、あつても軽微となる。
In this invention, the antenna horn is attached to the reflector so that the spherical part made of hard synthetic resin is located in front of it, and the spherical part, which is stronger than a flat plate, is easily pecked by birds with their beaks. However, if the direction of the beak deviates from the radius of curvature of the spherical part, the beak will slip and will not be damaged. Also, when the geostationary broadcasting satellite is facing the sun, the sunlight reflected by the reflector will converge at the focal point, but the spherical part protrudes further forward from the front end of the horn through the protrusion, and the sunlight will be reflected at a position quite far from the focal point. Moreover, by having a spherical shape, the amount of heat received per unit area is significantly lower than that of a flat one, so the temperature rise in the spherical portion can be suppressed to a considerably low level. or,
Since the spherical part has a shape that is approximately perpendicular to the direction in which the radio waves arrive from the reflecting mirror, the radiation power density is more uniform than that of a flat part. Since the wave is sized to pass through a nearby spherical surface, the angle of incidence of the spherical wave on the spherical surface becomes uniformly small. However, the lower part of the fixture that attaches the feedome to the horn opening end is hidden behind the spherical part and the protruding part and cannot support the snow on the feedome from below, so even if there is snow, it will be light since there is no snow on the spherical part.
以下本考案の実施例を図面について説明する。
第1図に示すものは、フイードホーン1とその基
部内周から突き出た一次ホーン2からなるアンテ
ナホーン3のフイードホーン1の開口端に周設さ
れたフランジ部4に、又、第2図に示すものは、
アンテナ一次ホーン5の開口端に周設されたフラ
ンジ部6に、略円筒状をなす突出し部7の前端に
フランジ部8を突設すると共に、前端を球面部分
9で覆着してなるフイドーム10のフランジ部8
を、球面部分9を前にして適宜の手段、例えば断
面コ形の保持リング11で取付けている。フイド
ーム10は硬質合成樹脂材で成形されており、球
面部分9の大きさは、フイドーム10をホーン
1,5の開口端に取付けた状態にてホーン1,5
の円錐内面12,13の母線の延長線14,15
が突出し部7の前端近傍の球面部分を通るように
選定されている。
Embodiments of the present invention will be described below with reference to the drawings.
The one shown in FIG. 1 is attached to a flange 4 provided around the open end of the feed horn 1 of an antenna horn 3 consisting of a feed horn 1 and a primary horn 2 protruding from the inner periphery of its base. teeth,
A feedome 10 is formed by protruding a flange part 8 at the front end of a substantially cylindrical projection part 7 on a flange part 6 provided around the open end of the antenna primary horn 5, and covering the front end with a spherical part 9. flange part 8
is attached with the spherical portion 9 in front by suitable means, for example, a retaining ring 11 having a U-shaped cross section. The feed dome 10 is molded from a hard synthetic resin material, and the size of the spherical portion 9 is the same as that of the horns 1 and 5 when the feed dome 10 is attached to the open ends of the horns 1 and 5.
Extension lines 14, 15 of the generating lines of the conical inner surfaces 12, 13 of
is selected so that it passes through a spherical portion near the front end of the protrusion 7.
尚、本実施例ではフイドーム10の球面部分9
の外径と曲率半径を同寸としている。又、フイド
ーム10の突出し部7は本実施例では円筒部とし
ているが、若干テーパをつけるとか、Rをつける
ようにしてもよい。 In this embodiment, the spherical portion 9 of the feedome 10
The outer diameter and radius of curvature are the same. Further, although the projecting portion 7 of the feed dome 10 is a cylindrical portion in this embodiment, it may be slightly tapered or rounded.
尚又図中、16はホーン1,5の基部に突設し
た円偏波直線偏波変換器である。 Furthermore, in the figure, 16 is a circularly polarized/linearly polarized wave converter protruding from the bases of the horns 1 and 5.
本実施例においては、アンテナ用ホーンの前面
に硬質合成樹脂製の球面部分9を位置せしめて反
射鏡24に取付けており、平板状のものより一段
と強度が大となる球面部分9は鳥類がくちばしで
つついてもつつく方向が球面部分9の曲率半径よ
りずれるとくちばしが滑るため破損されない。
又、静止放送衛星が太陽の方向にあると反射鏡で
反射した太陽光は焦点に集まるが、球面部分9は
ホーン1,5の開口端17から突出し部7を経て
さらに前方へ突き出ていて焦点よりかなり離れた
位置で太陽光を受けとめ、しかも球面状を呈する
ことにより平坦なものに比べ単位面積当りの受熱
量が格段に少くなるから、球面部分9の温度上昇
をかなり低く押えることができる。又、球面部分
9は反射鏡からの電波到来方向に略直角な形状で
あるから、放射電力密度が平坦なものに比べ均一
化され、さらに球面部分9はホーン1,5の円錐
内面12,13の母線の延長線14,15が突出
し部7の前端近傍の球面部分を通る大きさとして
いるので、球面波は一様に小さな入射角で球面部
分を通過することになる。しかして、保持リング
11の下部は若干上向きとなる球面部分9及び突
出し部7でかくれるため、フイドーム10上の雪
を下方から支持できない、従つて、球面部分に積
雪がないか、あつても軽微となる。 In this embodiment, a spherical part 9 made of hard synthetic resin is placed on the front side of the antenna horn and attached to the reflector 24. Even if the beak is pecked, if the peck direction deviates from the radius of curvature of the spherical portion 9, the beak will slip and will not be damaged.
Also, when the geostationary broadcasting satellite is in the direction of the sun, the sunlight reflected by the reflector will be focused at the focal point, but the spherical portion 9 will protrude further forward from the open end 17 of the horns 1 and 5 through the protruding portion 7, and the focal point will be focused. It receives sunlight from a much further away position, and because it has a spherical shape, the amount of heat received per unit area is much lower than that of a flat one, so the temperature rise in the spherical part 9 can be suppressed to a considerably low level. Furthermore, since the spherical portion 9 has a shape substantially perpendicular to the direction in which the radio waves arrive from the reflecting mirror, the radiation power density is more uniform than that of a flat one. Since the extension lines 14 and 15 of the generatrix are sized to pass through the spherical part near the front end of the protrusion 7, the spherical wave uniformly passes through the spherical part at a small incident angle. However, since the lower part of the retaining ring 11 is hidden by the spherical part 9 and the protruding part 7 which are slightly upwardly oriented, it is not possible to support the snow on the field 10 from below. It will be minor.
以上の説明より明らかなように本考案によれ
ば、硬質合成樹脂製のフイドームの前面は球面状
をなすから平坦なものに比べ強度が一段と向上す
ると共に、鳥類が球面部分をつついてもフイドー
ムは損傷され難い。又、球面部分の放射電力密度
が平坦なものに比べ均一化され、さらにホーンの
円錐内面の母線の延長線が突出し部の前端近傍の
球面部分を通るから、球面部分に対する球面波の
入射角が一様に小さくなり電気的な反射損失が少
ない。又、球面部分を等厚とすることによつて、
ここを通過する電波の損失や位相等も一様となり
効率がよい。又、球面部分はホーン前端から突出
し部を経てさらに前方へ突き出ており、しかも、
平坦なものより単位面積当りの受熱量が小さいか
ら、平坦なものに比べ反射鏡で反射した太陽光に
よる温度上昇をかなり低く押えることができる。
このため、温度上昇によるフイドームの破損を防
止できると共に、耐熱性の面で材料の選択が楽で
あり、成形性のよい硬質合成樹脂材を使用でき
る。しかして、球面部分に積雪することが殆どな
いので積雪による電波障害はないか、あつても軽
微である。
As is clear from the above explanation, according to the present invention, the front surface of the hard synthetic resin feedome is spherical, so the strength is much improved compared to a flat one, and even if a bird pecks at the spherical part, the feedome will remain intact. Not easily damaged. In addition, the radiation power density of the spherical part is more uniform than that of a flat part, and since the extension of the generatrix of the conical inner surface of the horn passes through the spherical part near the front end of the protrusion, the angle of incidence of the spherical wave on the spherical part is It is uniformly small and has little electrical reflection loss. Also, by making the spherical part equal thickness,
The loss, phase, etc. of the radio waves passing through this area are uniform, resulting in good efficiency. In addition, the spherical part protrudes further forward from the front end of the horn through the protruding part, and,
Since the amount of heat received per unit area is smaller than that of a flat object, the temperature rise due to sunlight reflected by a reflecting mirror can be suppressed considerably lower than that of a flat object.
Therefore, damage to the feedome due to temperature rise can be prevented, and the material can be easily selected in terms of heat resistance, and a hard synthetic resin material with good moldability can be used. However, since there is almost no snow accumulation on the spherical surface, there is no radio wave interference due to snow accumulation, or if there is, it is only minor.
第1図は本考案をアンテナホーンに実施した側
面図、第2図は本考案をアンテナ一次ホーンの実
施した側面図、第3図はフイドーム付アンテナホ
ーンを備えた反射鏡の側面図、第4図及び第5図
はそれぞれ従来品の側面図である。
1……フイードホーン、2……一次ホーン、3
……アンテナホーン、5……アンテナ一次ホー
ン、7……突出し部、8……フランジ部、9……
球面部分、10……フイドーム、12,13……
円錐内面、14,15……母線の延長線。
Fig. 1 is a side view of the present invention implemented in an antenna horn, Fig. 2 is a side view of the antenna primary horn in which the present invention is implemented, Fig. 3 is a side view of a reflector equipped with an antenna horn with a feed dome, and Fig. 4 5 and 5 are side views of the conventional product, respectively. 1...Feed horn, 2...Primary horn, 3
...Antenna horn, 5...Antenna primary horn, 7...Protrusion part, 8...Flange part, 9...
Spherical part, 10...Fidome, 12, 13...
Inner surface of cone, 14, 15... extension line of generatrix.
Claims (1)
突設すると共に前端を球面部分で覆着してなる硬
質合成樹脂製のフイドームを、そのフランジ部で
オフセツトパラボラアンテナ用ホーンの開口端に
装着し、且つ、この装着状態にてホーンの円錐内
面の母線の延長線が突出し部の前端近傍の球面部
分を通るようにしたことを特徴とするフイドーム
付アンテナホーン。 A field made of hard synthetic resin is provided with a flange protruding from the rear end of a substantially cylindrical protrusion and the front end is covered with a spherical part, and the flange is attached to the open end of the horn for the offset parabolic antenna. An antenna horn with a feedome, characterized in that the antenna horn is mounted, and in this mounted state, an extension line of the generatrix of the conical inner surface of the horn passes through a spherical part near the front end of the protrusion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984161251U JPH024493Y2 (en) | 1984-10-25 | 1984-10-25 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984161251U JPH024493Y2 (en) | 1984-10-25 | 1984-10-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6175610U JPS6175610U (en) | 1986-05-21 |
JPH024493Y2 true JPH024493Y2 (en) | 1990-02-02 |
Family
ID=30719157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1984161251U Expired JPH024493Y2 (en) | 1984-10-25 | 1984-10-25 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH024493Y2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2298272A (en) * | 1938-09-19 | 1942-10-13 | Research Corp | Electromagnetic horn |
JPS58184802A (en) * | 1982-04-22 | 1983-10-28 | Toshiba Corp | Reflecting mirror antenna device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58135105U (en) * | 1982-03-08 | 1983-09-10 | デイエツクスアンテナ株式会社 | Bag-shaped snow protection body for satellite broadcasting antenna equipment |
-
1984
- 1984-10-25 JP JP1984161251U patent/JPH024493Y2/ja not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2298272A (en) * | 1938-09-19 | 1942-10-13 | Research Corp | Electromagnetic horn |
JPS58184802A (en) * | 1982-04-22 | 1983-10-28 | Toshiba Corp | Reflecting mirror antenna device |
Also Published As
Publication number | Publication date |
---|---|
JPS6175610U (en) | 1986-05-21 |
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