JP3857178B2 - Primary radiator for parabolic antenna - Google Patents

Primary radiator for parabolic antenna Download PDF

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Publication number
JP3857178B2
JP3857178B2 JP2002128378A JP2002128378A JP3857178B2 JP 3857178 B2 JP3857178 B2 JP 3857178B2 JP 2002128378 A JP2002128378 A JP 2002128378A JP 2002128378 A JP2002128378 A JP 2002128378A JP 3857178 B2 JP3857178 B2 JP 3857178B2
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primary radiator
waterproof cover
protrusion
vswr
parabolic antenna
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JP2003324309A (en
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哲也 池本
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Sharp Corp
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Sharp Corp
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    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、衛星放送受信用パ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。
【０００２】
【従来の技術】
図３は、一般的なパラボラアンテナの概略側面図、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。
【０００３】
パラボラアンテナによる衛星放送の受信は、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 Ｂｌｏｋ ｄｏｗｎ−ｃｏｎｖｅｒｔｅｒ）７４により１２ＧHz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。
【０００４】
ここで、パラボラアンテナ用の一次放射器７２は、図４に示す構造となっている。
【０００５】
すなわち、ホーンアンテナ本体８１は円筒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。
【０００６】
この防水カバー９１は、プラスチック等の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。
【０００７】
例えば、日本国内で衛星放送ＢＳ（伝送周波数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。
【０００８】
そのため、この防水カバー９１の内壁面９２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。
【０００９】
【発明が解決しようとする課題】
ところで、最近、日本国内では、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１２．２ＧHz〜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１１．７〜１２．７５ＧHz（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。
【００１０】
しかしながら、上記した従来のパラボラアンテナ用一次放射器７２では、帯域幅が５００〜８００ＭHz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。
【００１１】
本発明はかかる問題点を解決すべく創案されたもので、その目的は、１０５０ＭHzの帯域幅までＶＳＷＲ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。
【００１２】
【課題を解決するための手段】
本発明のパラボラアンテナ用一次放射器は、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〜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（２３ｄＢ以上）を実現することができる。
【００１３】
また、本発明のパラボラアンテナ用一次放射器は、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〜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（２３ｄＢ以上）を実現することができる。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態について、図面を参照して説明する。
【００１５】
［実施の形態１］
図１は、本実施の形態１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。
【００１６】
このパラボラアンテナ用一次放射器は、ホーンアンテナ本体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２１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。
【００１７】
また、この防水カバー２１の内壁面２２には、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。
【００１８】
このような構成の突起部２３において、本実施の形態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（２３ｄＢ以上）を実現することができる。
【００１９】
［実施の形態２］
図２は、本実施の形態２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。
【００２０】
このパラボラアンテナ用一次放射器は、ホーンアンテナ本体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。
【００２１】
また、この防水カバー３１の内壁面３２には、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、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。
【００２２】
これにより、外側の高い突起部３３が低い周波数の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〜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。
【００２３】
なお、上記実施の形態２では、突起部を同心軸状に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。
【００２４】
【発明の効果】
本発明のパラボラアンテナ用一次放射器は、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、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。
【００２５】
また、本発明のパラボラアンテナ用一次放射器は、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〜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（２３ｄＢ以上）を実現することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１に係わるのパラボラアンテナ用一次放射器の断面図である。
【図２】本発明の実施の形態２に係わるのパラボラアンテナ用一次放射器の断面図である。
【図３】一般的なパラボラアンテナの概略側面図である。
【図４】従来のパラボラアンテナ用一次放射器の断面図である。
【符号の説明】
１１ ホーンアンテナ本体
１２ 先端開口部
１３ Ｏリング
２１ 防水カバー
２２ 内壁面
２３ 突起部
２４ 段差部
２５，２６ 段差突起部分
３１ 防水カバー
３２ 内壁面
３３，３４ 突起部
Ｌ１ ホーンアンテナ本体の中心軸[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a satellite dish receiving parabola antenna, and more particularly to a structure of a primary radiator for adjusting VSWR.
[0002]
[Prior art]
FIG. 3 is a schematic side view of a general parabolic antenna, and FIG. 4 is a cross-sectional view of a conventional primary radiator for a parabolic antenna.
[0003]
As shown in FIG. 3, the satellite broadcast reception by the parabolic antenna is configured such that the signals S in the approximately 12 GHz band reflected by the antenna unit 71 are collected in the opening 73 of the primary radiator 72. The signal that has passed through the primary radiator 72 is frequency-converted from a 12 GHz band to a 1 GHz band by an LNB (Low Noise Block down-converter) 74, and the frequency-converted signal passes through the cable 75 to an indoor receiver ( The signal is input to a BS (or CS) tuner or a built-in TV (or VTR) 76.
[0004]
Here, the primary radiator 72 for the parabolic antenna has a structure shown in FIG.
[0005]
That is, the horn antenna main body 81 is formed in a cylindrical shape, and the waterproof cover 91 is press-fitted into the front end opening 82 that expands in a fan shape. The waterproof cover 91 is for preventing moisture such as rain from entering the horn antenna body 81 of the primary radiator from the outside. Therefore, a waterproof function is maintained by interposing a water-stopping O-ring 100 between the end opening 82 of the horn antenna body 81 and the waterproof cover 91.
[0006]
Since the waterproof cover 91 is formed of a resin such as plastic, it has a relatively high dielectric constant with respect to air. Therefore, the shape of the waterproof cover 91 greatly affects the input VSWR including the primary radiator.
[0007]
For example, when a satellite broadcast BS (transmission frequency 11.7 to 12.0 GHz: bandwidth 300 MHz) is received in Japan, the waterproof cover 91 affects the VSWR.
[0008]
Therefore, a cylindrical projection 92 for suppressing VSWR is formed on the inner wall surface 92 of the waterproof cover 91. The projecting portion 92 is formed so as to protrude toward the end opening 82 of the horn antenna main body 81 and is disposed concentrically with the central axis L 1 of the horn antenna main body 81. Thus, the input VSWR is suppressed by making the inside of the protrusion 92 hollow.
[0009]
[Problems to be solved by the invention]
By the way, recently in Japan, a satellite for CS digital broadcasting (transmission frequency 12.2 GHz to 12.75 GHz: bandwidth 1050 MHz) was launched at the same 110 ° east longitude as the broadcasting satellite (BS) and started service. is doing. Therefore, in order to receive both BS and digital CS with one parabolic antenna, a good primary radiator with a small input VSWR is required for an input frequency of 11.7 to 12.75 GHz (bandwidth 1050 MHz). It has become.
[0010]
However, in the above-described conventional primary radiator 72 for a parabolic antenna, the VSWR can be satisfactorily suppressed for frequencies with a bandwidth of about 500 to 800 MHz, but the VSWR can be satisfactorily suppressed to a bandwidth of 1050 MHz. There was a problem that was difficult. And when the favorable characteristic which suppresses VSWR is not acquired, there also existed a problem that it was difficult to obtain 23 dB or more of cross polarization characteristics of a total antenna.
[0011]
The present invention was devised to solve such problems, and an object thereof is to provide a primary radiator for a parabolic antenna having a structure capable of satisfactorily suppressing VSWR up to a bandwidth of 1050 MHz.
[0012]
[Means for Solving the Problems]
The primary radiator for a parabolic antenna of the present invention is provided with a waterproof cover at an end opening of a horn antenna main body, on the inner wall surface of the waterproof cover, facing the end opening, and at the center of the horn antenna main body. In a primary radiator for a parabolic antenna in which a cylindrical projection made of a dielectric material arranged concentrically with a shaft is formed, an annular stepped portion is formed at the opening tip of the projection. Thus, by forming an annular step at the opening tip of the protrusion, the outer high step protrusion can suppress the low frequency VSWR, and the inner low step protrusion can suppress the high frequency VSWR, The input VSWR can be effectively suppressed over a wide bandwidth of 300 MHz to 1050 MHz. Also, good cross polarization characteristics (23 dB or more) can be realized without degrading the cross polarization characteristics of the blocks connected to the subsequent stage.
[0013]
Further, the primary radiator for a parabolic antenna according to the present invention is a parabolic primary radiator in which a waterproof cover is provided at an end opening of a horn antenna main body, on an inner wall surface of the waterproof cover, toward the end opening. In addition, a plurality of cylindrical protrusions made of a dielectric material arranged concentrically with the central axis of the horn antenna body are provided, and the inner protrusions are formed at a lower height than the outer protrusions. Has been. Thereby, the outer high protrusion can suppress the low frequency VSWR, the inner low protrusion can suppress the high frequency VSWR, and effectively suppress the input VSWR over a wide bandwidth of 300 MHz to 1050 MHz. It becomes possible. Also, good cross polarization characteristics (23 dB or more) can be realized without degrading the cross polarization characteristics of the blocks connected to the subsequent stage.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
[Embodiment 1]
FIG. 1 shows a sectional view of a primary radiator for a parabolic antenna according to the first embodiment.
[0016]
In this primary radiator for a parabolic antenna, a horn antenna main body 11 is formed in a cylindrical shape, and a resin waterproof cover 21 is press-fitted into a distal end opening portion 12 that expands in a fan shape. Further, a water-stopping O-ring 13 is interposed between the end opening 12 of the horn antenna main body 11 and the waterproof cover 21.
[0017]
In addition, a cylindrical protrusion 23 for suppressing VSWR is formed on the inner wall surface 22 of the waterproof cover 21. The protrusion 23 is formed so as to protrude toward the end opening 12 of the horn antenna main body 11 and is arranged concentrically with the central axis L1 of the horn antenna main body 11.
[0018]
In the projecting portion 23 having such a configuration, in the first embodiment, an annular stepped portion 24 is formed at the opening tip of the projecting portion 23. In this way, by forming the annular step 24 at the opening tip of the protrusion 23, the outer high step protrusion 25 suppresses the low frequency VSWR, and the inner low step protrusion 26 increases the high frequency VSWR. And the input VSWR can be effectively suppressed over a wide bandwidth of 300 MHz to 1050 MHz. Also, good cross polarization characteristics (23 dB or more) can be realized without degrading the cross polarization characteristics of the blocks connected to the subsequent stage.
[0019]
[Embodiment 2]
FIG. 2 shows a cross-sectional view of the parabolic antenna primary radiator according to the second embodiment.
[0020]
In this primary radiator for a parabolic antenna, a horn antenna body 11 is formed in a cylindrical shape, and a waterproof cover 31 made of resin is press-fitted into a front end opening 12 that expands in a fan shape. Further, between the end opening 12 of the horn antenna body 11 and the waterproof cover 31, an O-ring 13 for water stop is interposed.
[0021]
Further, on the inner wall surface 32 of the waterproof cover 31, a plurality of cylindrical projections 33 and 34 (two in the second embodiment) for suppressing VSWR are formed. The protrusions 33 and 34 are formed so as to protrude toward the end opening 12 of the horn antenna main body 11 and are arranged concentrically with the central axis L1 of the horn antenna main body 11. Further, the heights of the protrusions 33 and 34 are formed so that the inner small-diameter protrusion 34 is lower than the outer large-diameter protrusion 33.
[0022]
Thus, the outer high protrusion 33 can suppress the low frequency VSWR, and the inner low protrusion 34 can suppress the high frequency VSWR, effectively suppressing the input VSWR over a wide bandwidth of 300 MHz to 1050 MHz. be able to. Also, good cross polarization characteristics (23 dB or more) can be realized without degrading the cross polarization characteristics of the blocks connected to the subsequent stage.
[0023]
In the second embodiment, two concentric shafts are provided, but three or more concentric shafts may be provided. In this case, what is necessary is just to form so that the inner side projection part may become low.
[0024]
【The invention's effect】
The primary radiator for a parabolic antenna of the present invention is provided with a waterproof cover at the end opening of the horn antenna body, and faces the end opening on the inner wall surface of the waterproof cover, and the central axis of the horn antenna body. In a primary radiator for a parabolic antenna in which cylindrical projections made of a dielectric material arranged concentrically are formed, an annular stepped portion is formed at the opening tip of the projection. Thus, by forming an annular step at the opening tip of the protrusion, the outer high step protrusion can suppress the low frequency VSWR, and the inner low step protrusion can suppress the high frequency VSWR, The input VSWR can be effectively suppressed over a wide bandwidth of 300 MHz to 1050 MHz. In addition, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block connected to the subsequent stage.
[0025]
The parabolic antenna primary radiator of the present invention is a parabolic primary radiator in which a waterproof cover is provided at an end opening of a horn antenna body, on an inner wall surface of the waterproof cover, toward an end opening, and A plurality of cylindrical projections made of a dielectric material arranged concentrically with the central axis of the horn antenna body are provided, and the height of the inner projection is lower than the outer projection. . Thereby, the outer high protrusion can suppress the low frequency VSWR, the inner low protrusion can suppress the high frequency VSWR, and effectively suppress the input VSWR over a wide bandwidth of 300 MHz to 1050 MHz. It becomes possible. In addition, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block connected to the subsequent stage.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a primary radiator for a parabolic antenna according to Embodiment 1 of the present invention.
FIG. 2 is a sectional view of a primary radiator for a parabolic antenna according to a second embodiment of the present invention.
FIG. 3 is a schematic side view of a general parabolic antenna.
FIG. 4 is a cross-sectional view of a conventional primary radiator for a parabolic antenna.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Horn antenna main body 12 Tip opening part 13 O-ring 21 Waterproof cover 22 Inner wall surface 23 Projection part 24 Step part 25, 26 Step projection part 31 Waterproof cover 32 Inner wall surface 33, 34 Projection part L1 Center axis of horn antenna main body

Claims (4)

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。A waterproof cover is provided at the end opening of the horn antenna main body, and the dielectric is disposed on the inner wall surface of the waterproof cover toward the end opening and concentrically with the central axis of the horn antenna main body. In a primary radiator for a parabolic antenna in which a cylindrical projection formed of
A primary radiator for a parabolic antenna, wherein an annular stepped portion is formed at an opening tip of the projection. 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。The primary radiator for a parabolic antenna according to claim 1, wherein the outer high step protrusion suppresses a low frequency VSWR and the inner low step protrusion suppresses a high frequency VSWR. 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。In the parabolic primary radiator in which a waterproof cover is provided at the end opening of the horn antenna body,
The inner wall surface of the waterproof cover is provided with a plurality of cylindrical projections made of a dielectric material facing the end opening and arranged concentrically with the central axis of the horn antenna body. A primary radiator for a parabolic antenna, characterized in that the height of an inner protrusion is lower than the protrusion. 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。The primary radiator for a parabolic antenna according to claim 3, wherein the outer high protrusion suppresses a low frequency VSWR and the inner low protrusion suppresses a high frequency VSWR.
JP2002128378A 2002-04-30 2002-04-30 Primary radiator for parabolic antenna Expired - Fee Related JP3857178B2 (en)

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