JP2003324309A - パラボラアンテナ用一次放射器 - Google Patents
パラボラアンテナ用一次放射器Info
- Publication number
- JP2003324309A JP2003324309A JP2002128378A JP2002128378A JP2003324309A JP 2003324309 A JP2003324309 A JP 2003324309A JP 2002128378 A JP2002128378 A JP 2002128378A JP 2002128378 A JP2002128378 A JP 2002128378A JP 2003324309 A JP2003324309 A JP 2003324309A
- Authority
- JP
- Japan
- Prior art keywords
- protrusion
- primary radiator
- vswr
- waterproof cover
- horn antenna
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
- B63B2043/006—Methods or installations specially adapted for detecting ingress of ambient water, e.g. leak detectors
Abstract
MHzの帯域幅までVSWRを良好に抑え込むことができ
る構造とする。 【解決手段】 ホーンアンテナ本体11の先端開口部1
2に樹脂製の防水カバー21が圧入により嵌め込まれて
おり、この防水カバー21の内壁面22に、VSWRを
抑えるための円筒形状の突起部23が形成されている。
この突起部23は、ホーンアンテナ本体11の端部開口
部12側に突出して形成されており、かつ、ホーンアン
テナ本体11の中心軸L1と同心軸状に配置されてい
る。また、突起部23の開口先端部には、環状の段差部
24が形成されており、外側の高い段差突起部分25が
低い周波数のVSWRを抑え、内側の低い段差突起部2
6が高い周波数のVSWRを抑える構造となっている。
Description
ラボラアンテナに関し、特に、VSWRを調整するため
の一次放射器の構造に関する。
略側面図、図4は、従来のパラボラアンテナ用一次放射
器の断面図である。
は、図3に示すように、アンテナ部71で反射された約
12GHz帯の信号Sが、一次放射器72の開口部73に
集約されるようになっている。そして、一次放射器72
を通過した信号は、LNB(Low Noise Bl
ok down−converter)74により12
GHz帯から1GHz帯に周波数変換され、この周波数変換
された信号が、ケーブル75を通って屋内受信機(BS
(またはCS)チューナ、若しくは内蔵のTV(または
VTR)76に入力されるようになっている。
72は、図4に示す構造となっている。
形状に形成されており、扇状に広がった先端開口部82
に防水カバー91が圧入により嵌め込まれている。この
防水カバー91は、外部から一次放射器のホーンアンテ
ナ本体81内部へ雨等の水分が入り込まないようにする
ためのものである。そのため、ホーンアンテナ本体81
の端部開口部82と防水カバー91との間には、止水用
のOリング100を介装することにより、防水機能を保
っている。
樹脂で形成されているため、空気に対して比較的高い誘
電率を有している。そのため、防水カバー91の形状
が、一次放射器を含めた入力VSWRに大きく影響する
ことになる。
波数11.7〜12.0GHz:帯域幅300MHz)を受
信する際、この防水カバー91によってVSWRが影響
を受ける。
2には、VSWRを抑えるための円筒形状の突起部92
が形成されている。この突起部92は、ホーンアンテナ
本体81の端部開口部82側に突出して形成されてお
り、かつ、ホーンアンテナ本体81の中心軸L1と同心
軸状に配置されている。このように突起部92の内部を
空洞とすることで、入力VSWRを抑えている。
国内では、放送衛星(BS)と同じ東経110°の位置
に新たにCSディジタル放送用の衛星(伝送周波数1
2.2GHz〜12.75GHz:帯域幅1050MHz)が
打ち上げられサービスを開始している。そのため、1個
のパラボラアンテナでBS及びディジタルCSの両方を
受信するためには、入力周波数11.7〜12.75G
Hz(帯域幅1050MHz)に対して入力VSWRの小さ
い良好な一次放射器が必要となっている。
ンテナ用一次放射器72では、帯域幅が500〜800
MHz程度の周波数に対してはVSWRを良好に抑えるこ
とができるが、1050MHzの帯域幅までVSWRを良
好に抑え込むことが難しいといった問題があった。そし
て、VSWRを抑え込む良好な特性が得られない場合に
は、アンテナトータルの交差偏波特性を23dB以上得
ることが難しいといった問題もあった。
れたもので、その目的は、1050MHzの帯域幅までV
SWRを良好に抑え込むことができる構造のパラボラア
ンテナ用一次放射器を提供することにある。
ナ用一次放射器は、ホーンアンテナ本体の端部開口部に
防水カバーが設けられ、この防水カバーの内壁面に、前
記端部開口部に向かい、かつ、前記ホーンアンテナ本体
の中心軸と同心軸状に配置された誘電体からなる円筒形
状の突起部が形成されたパラボラアンテナ用一次放射器
において、前記突起部の開口先端部に環状の段差部が形
成されている。このように、突起部の開口先端部に環状
の段差部を形成することで、外側の高い段差突起が低い
周波数のVSWRを抑え、内側の低い段差突起が高い周
波数のVSWRを抑えることができ、300MHz〜10
50MHzの広い帯域幅にわたって、入力VSWRを効果
的に抑えることが可能となる。また、後段につながるブ
ロックの交差偏波特性を劣化させることなく、良好な交
差偏波特性(23dB以上)を実現することができる。
射器は、ホーンアンテナ本体の端部開口部に防水カバー
が設けられたパラボラ用一次放射器において、前記防水
カバーの内壁面に、前記端部開口部に向かい、かつ、前
記ホーンアンテナ本体の中心軸と同心軸状に配置された
誘電体からなる円筒形状の突起部が複数設けられるとと
もに、外側の突起部に対して内側の突起部の高さが低く
形成されている。これにより、外側の高い突起部が低い
周波数のVSWRを抑え、内側の低い突起部が高い周波
数のVSWRを抑えることができ、300MHz〜105
0MHzの広い帯域幅にわたって、入力VSWRを効果的
に抑えることが可能となる。また、後段につながるブロ
ックの交差偏波特性を劣化させることなく、良好な交差
偏波特性(23dB以上)を実現することができる。
て、図面を参照して説明する。
のパラボラアンテナ用一次放射器の断面図を示してい
る。
ーンアンテナ本体11が円筒形状に形成されており、扇
状に広がった先端開口部12に、樹脂製の防水カバー2
1が圧入により嵌め込まれている。また、ホーンアンテ
ナ本体11の端部開口部12と防水カバー21との間に
は、止水用のOリング13が介装されている。
は、VSWRを抑えるための円筒形状の突起部23が形
成されている。この突起部23は、ホーンアンテナ本体
11の端部開口部12側に突出して形成されており、か
つ、ホーンアンテナ本体11の中心軸L1と同心軸状に
配置されている。
実施の形態1では、突起部23の開口先端部に環状の段
差部24が形成されている。このように、突起部23の
開口先端部に環状の段差部24を形成することで、外側
の高い段差突起部分25が低い周波数のVSWRを抑
え、内側の低い段差突起部26が高い周波数のVSWR
を抑えることができ、300MHz〜1050MHzの広い
帯域幅にわたって、入力VSWRを効果的に抑えること
ができる。また、後段につながるブロックの交差偏波特
性を劣化させることなく、良好な交差偏波特性(23d
B以上)を実現することができる。
のパラボラアンテナ用一次放射器の断面図を示してい
る。
ーンアンテナ本体11が円筒状に形成されており、扇状
に広がった先端開口部12に、樹脂製の防水カバー31
が圧入により嵌め込まれている。また、ホーンアンテナ
本体11の端部開口部12と防水カバー31との間に
は、止水用のOリング13が介装されている。
は、VSWRを抑えるための円筒形状の複数(本実施の
形態2では、2個)の突起部33,34が形成されてい
る。これら突起部33,34は、ホーンアンテナ本体1
1の端部開口部12側に突出して形成されており、か
つ、ホーンアンテナ本体11の中心軸L1と同心軸状に
配置されている。また、これら突起部33,34の高さ
は、外側の大径の突起部33に対して、内側の小径の突
起部34の方が低くなるように形成されている。
周波数のVSWRを抑え、内側の低い突起部34が高い
周波数のVSWRを抑えることができ、300MHz〜1
050MHzの広い帯域幅にわたって、入力VSWRを効
果的に抑えることができる。また、後段につながるブロ
ックの交差偏波特性を劣化させることなく、良好な交差
偏波特性(23dB以上)を実現することができる。
心軸状に2個設けた構成としているが、同心軸状に3個
以上設けることも可能である。この場合には、内側の突
起部ほど、その高さが低くなるように形成すればよい。
は、ホーンアンテナ本体の端部開口部に防水カバーが設
けられ、この防水カバーの内壁面に、端部開口部に向か
い、かつ、ホーンアンテナ本体の中心軸と同心軸状に配
置された誘電体からなる円筒形状の突起部が形成された
パラボラアンテナ用一次放射器において、突起部の開口
先端部に環状の段差部が形成されている。このように、
突起部の開口先端部に環状の段差部を形成することで、
外側の高い段差突起が低い周波数のVSWRを抑え、内
側の低い段差突起が高い周波数のVSWRを抑えること
ができ、300MHz〜1050MHzの広い帯域幅にわた
って、入力VSWRを効果的に抑えることができる。ま
た、後段につながるブロックの交差偏波特性を劣化させ
ることなく、良好な交差偏波特性(23dB以上)を実
現することができる。
射器は、ホーンアンテナ本体の端部開口部に防水カバー
が設けられたパラボラ用一次放射器において、防水カバ
ーの内壁面に、端部開口部に向かい、かつ、ホーンアン
テナ本体の中心軸と同心軸状に配置された誘電体からな
る円筒形状の突起部が複数設けられるとともに、外側の
突起部に対して内側の突起部の高さが低く形成されてい
る。これにより、外側の高い突起部が低い周波数のVS
WRを抑え、内側の低い突起部が高い周波数のVSWR
を抑えることができ、300MHz〜1050MHzの広い
帯域幅にわたって、入力VSWRを効果的に抑えること
が可能となる。また、後段につながるブロックの交差偏
波特性を劣化させることなく、良好な交差偏波特性(2
3dB以上)を実現することができる。
テナ用一次放射器の断面図である。
テナ用一次放射器の断面図である。
る。
である。
Claims (4)
- 【請求項1】 ホーンアンテナ本体の端部開口部に防水
カバーが設けられ、この防水カバーの内壁面に、前記端
部開口部に向かい、かつ、前記ホーンアンテナ本体の中
心軸と同心軸状に配置された誘電体からなる円筒形状の
突起部が形成されたパラボラアンテナ用一次放射器にお
いて、 前記突起部の開口先端部に環状の段差部が形成されてい
ることを特徴とするパラボラアンテナ用一次放射器。 - 【請求項2】 外側の高い段差突起が低い周波数のVS
WRを抑え、内側の低い段差突起が高い周波数のVSW
Rを抑えることを特徴とする請求項1に記載のパラボラ
アンテナ用一次放射器。 - 【請求項3】 ホーンアンテナ本体の端部開口部に防水
カバーが設けられたパラボラ用一次放射器において、 前記防水カバーの内壁面に、前記端部開口部に向かい、
かつ、前記ホーンアンテナ本体の中心軸と同心軸状に配
置された誘電体からなる円筒形状の突起部が複数設けら
れるとともに、外側の突起部に対して内側の突起部の高
さが低く形成されていることを特徴とするパラボラアン
テナ用一次放射器。 - 【請求項4】 外側の高い突起部が低い周波数のVSW
Rを抑え、内側の低い突起部が高い周波数のVSWRを
抑えることを特徴とする請求項3に記載のパラボラアン
テナ用一次放射器。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002128378A JP3857178B2 (ja) | 2002-04-30 | 2002-04-30 | パラボラアンテナ用一次放射器 |
CNB031230946A CN100353609C (zh) | 2002-04-30 | 2003-04-30 | 抛物线天线用初级发射器 |
KR1020030027513A KR100550212B1 (ko) | 2002-04-30 | 2003-04-30 | 파라볼라 안테나용 1차 방사기 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002128378A JP3857178B2 (ja) | 2002-04-30 | 2002-04-30 | パラボラアンテナ用一次放射器 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2003324309A true JP2003324309A (ja) | 2003-11-14 |
JP3857178B2 JP3857178B2 (ja) | 2006-12-13 |
Family
ID=29267672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002128378A Expired - Fee Related JP3857178B2 (ja) | 2002-04-30 | 2002-04-30 | パラボラアンテナ用一次放射器 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP3857178B2 (ja) |
KR (1) | KR100550212B1 (ja) |
CN (1) | CN100353609C (ja) |
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JP4084299B2 (ja) * | 2003-12-26 | 2008-04-30 | シャープ株式会社 | フィードホーン、電波受信用コンバータおよびアンテナ |
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JP3239030B2 (ja) * | 1994-12-14 | 2001-12-17 | シャープ株式会社 | パラボラアンテナ用一次放射器 |
JPH0936634A (ja) * | 1995-05-17 | 1997-02-07 | Sony Corp | フィドーム、1次放射器及びマイクロ波用アンテナ |
JP3277755B2 (ja) * | 1995-05-29 | 2002-04-22 | 松下電器産業株式会社 | ヘリカル一次放射器とコンバーター |
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WO2021177712A1 (ko) * | 2020-03-03 | 2021-09-10 | 삼성전자 주식회사 | 사용자의 귀에 착용 가능한 웨어러블 장치 및 그의 통신 지원을 위한 액세서리 |
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CN100353609C (zh) | 2007-12-05 |
CN1455472A (zh) | 2003-11-12 |
KR100550212B1 (ko) | 2006-02-08 |
JP3857178B2 (ja) | 2006-12-13 |
KR20030086410A (ko) | 2003-11-10 |
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