JP2004032794A - Primary radiator for parabolic antenna and satellite-broadcasting receiving converter - Google Patents

Primary radiator for parabolic antenna and satellite-broadcasting receiving converter Download PDF

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Publication number
JP2004032794A
JP2004032794A JP2003194378A JP2003194378A JP2004032794A JP 2004032794 A JP2004032794 A JP 2004032794A JP 2003194378 A JP2003194378 A JP 2003194378A JP 2003194378 A JP2003194378 A JP 2003194378A JP 2004032794 A JP2004032794 A JP 2004032794A
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dielectric
circularly polarized
plate
phone
polarized wave
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JP2003194378A
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JP4047775B2 (en
JP2004032794A5 (en
Inventor
Mikihiro Matsuura
松浦　幹浩
Koji Sakauchi
坂内　功治
Atsushi Kaneko
金子　敦
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Hitachi Kokusai Electric Inc
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Hitachi Kokusai Electric Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress multiple reflections inside a phone and acquire good reflection loss characteristics and good circularly polarized axis ratio characteristics over a wide frequency band. <P>SOLUTION: A phone part 12 to receive electric waves from a parabolic reflection mirror is provided at a front opening part of a case main body 11, and a phone cover 21 is provided at an opening part of the phone part 12. In the case main body 11, a circularly polarized wave generator 13 and a feeding part 14 are provided. In the circularly polarized wave generator 13, a rod like holding part 22 is provided in the side of the phone part 12 and a tubular dielectric 23 is provided at the front end so as to be united. The tubular dielectric 23 is set to the length, in which the rate of wavelength shorting of the dielectric is multiplied with about 1/4 wavelength of an input electric wave, and placed around the center of the opening part of the phone part 12. By providing the tubular dielectric 23 independently from the phone cover 21, the phone cover 21 can be formed thinly enough, and without degrading the receiving level of an antenna, multiple refections inside of the phone are suppressed to acquire good electric characteristics. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば衛星放送受信用パラボラアンテナにおいて、広帯域に亘り良好な円偏波軸比特性を有するパラボラアンテナ用１次放射器及び衛星放送受信用コンバータに関する。
【０００２】
【従来の技術】
従来、円偏波受信用パラボラアンテナに用いられる１次放射器は、図６に示すように構成されている。図６において、１１は有底円筒状のケース本体で、このケース本体１１の前面開口部にパラボラ反射鏡（図示せず）からの電波を受信するホーン部１２が一体に設けられている。上記ケース本体１１内には、直線偏波と円偏波の変換を行なう円偏波発生器１３が配置される。この円偏波発生器１３は、板状誘電体により形成したもので、長方形の誘電体の左右両辺に切り込み部を設けた形状となっている。また、ケース本体１１には、上記円偏波発生器１３の切り込み部から所定距離離れた位置に回路側との接続部となる給電部１４が設けられる。なお、上記円偏波発生器１３は、給電部１４に対して４５°傾斜して配置される。
【０００３】
そして、上記ホーン部１２の開口部には、１次放射器を保護するために、誘電体により形成したホーンカバー１５が設けられる。更に、このホーンカバー１５の中央部内側には、反射損失特性並びに円偏波軸比特性を改善するための突起１６が一体に設けられる。この突起１６は、該当電波の約１／４波長の奇数倍の長さに、誘電体の波長短縮率を乗じた長さに設定される。
【０００４】
上記のようにホーン部１２の内部を保護するために誘電体のホーンカバー１５が一般に用いられている。しかし、このホーンカバー１５を設けることによって、１次放射器内部で電波が多重反射し、１次放射器の諸特性が劣化する。特に、円偏波軸比特性においては、周波数帯域が狭帯域となる。従来では、上記ホーンカバー１５により電波の反射をホーンカバー１５に設けた突起１６により打ち消している。すなわち、誘電体の突起１６により位相を１８０°進めた反射波を発生させ、ホーンカバー１５による反射波と打ち消し合うように作用させている。
【０００５】
【発明が解決しようとする課題】
上記のようにホーンカバー１５の内側に突起１６を設けることにより、広周波数帯域に亘って良好な円偏波軸比特性を得ることができる。
【０００６】
しかし、誘電体の突起１６をホーンカバー１５と一体で成型するためには、ホーンカバー１５の突起部付近の寸法を厚くしなければ、希望とする寸法精度が得られず、また、突起部付近の寸法を厚くすると、ホーンカバー１５における通過損失が大きくなり、パラボラアンテナ総合での受信レベルが劣化するという問題があった。
【０００７】
本発明は上記の課題を解決するためになされたもので、ホーンカバーの寸法を厚く形成する必要がなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘って良好な円偏波軸比特性を得ることができ、電気特性の優れたパラボラアンテナ用１次放射器及び衛星放送受信用コンバータを提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は、円偏波を送受信するパラボラアンテナの１次放射器において、ケース本体の開口部に設けられ、パラボラ反射鏡からの電波を受信するホーン部と、このホーン部の開口部に設けられる誘電体のホーンカバーと、前記ケース本体内に設けられる給電部と、前記ケース本体内に設けられ、円偏波を直線偏波に変更する誘電体からなる円偏波発生器と、前記ホーン部の開口部中心付近に設置され、前記円偏波発生器に支持部を介して一体に設けられる筒状誘電体とを具備したことを特徴とする。
【０００９】
上記のように筒状誘電体をホーンカバーから独立して設け、円偏波発生器と一体に成型することにより、ホーンカバーを十分な薄さで成型することが可能となり、アンテナの受信レベルを低下させることなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘り良好な円偏波軸比特性を得ることができる。
【００１０】
【発明の実施の形態】
以下、図面を参照して本発明の実施形態を説明する。
（第１実施形態）
図１は、本発明の第１実施形態に係るパラボラアンテナ用１次放射器２０の構成を示す断面図である。図１において、１１は有底円筒状のケース本体で、このケース本体１１の前面開口部にパラボラ反射鏡（図示せず）からの電波を受信するホーン部１２が一体に設けられている。更に、このホーン部１２の開口部には、１次放射器を保護するために、誘電体により形成したホーンカバー２１が設けられる。
【００１１】
そして、上記ケース本体１１内には、直線偏波と円偏波の変換を行なう円偏波発生器１３が配置される。この円偏波発生器１３は、板状誘電体により形成したもので、長方形の誘電体の左右両辺に切り込み部を設けた構造となっており、また、ケース本体１１には、上記円偏波発生器１３の切り込み部から所定距離離れた位置に給電部１４が設けられる。なお、上記円偏波発生器１３は、給電部１４に対して４５°傾斜して配置される。
【００１２】
上記円偏波発生器１３には、ホーン部１２側に棒状の支持部２２が設けられ、その先端に筒状誘電体２３が設けられる。この筒状誘電体２３は、ホーン部１２の開口部中心付近に位置するように上記支持部２２を介して円偏波発生器１３に一体に設けられる。
【００１３】
すなわち、上記円偏波発生器１３、支持部２２及び筒状誘電体２３は、図２（ａ）、（ｂ）に示すように一体で成型されている。図２の（ａ）は円偏波発生器１３、支持部２２及び筒状誘電体２３を一体成型した状態を示す断面図、（ｂ）は同左側面図である。
【００１４】
上記筒状誘電体２３は、ホーンカバー２１での反射を打ち消すためのもので、入射電波の約１／４波長に誘電体の波長短縮率を乗じた長さに設定する。上記の長さを有する筒状誘電体２３を設けることにより、位相を１８０°進めた反射波を発生させてホーンカバー２１による反射波を打ち消すことができる。なお、筒状誘電体２３は、上記したようにホーン部１２の開口部中心付近に位置するように設けられるが、先端をホーンカバー２１の内側面に当接させても良い。
【００１５】
上記実施形態で示したように筒状誘電体２３をホーンカバー２１から独立して設け、円偏波発生器１３と一体に成型することにより、ホーンカバー２１を十分な薄さで成型することが可能となり、アンテナの受信レベルを低下させることなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘り良好な円偏波軸比特性を得ることができる。また、筒状誘電体２３を支持部２２を介して円偏波発生器１３と一体に成型することにより、簡単な構成で筒状誘電体２３を所定の位置に確実に保持でき、かつ安価に構成することができる。
【００１６】
（第２実施形態）
次に本発明の第２実施形態について説明する。
図３は、本発明の第２実施形態に係るパラボラアンテナ用１次放射器２０の構成を示す断面図である。この第２実施形態は、第１実施形態に示した筒状誘電体２３に代えて薄い円形の誘電体板２４を設けたものである。すなわち、支持部２２の先端に誘電体板２４を一体に設け、ホーンカバー２１の中央部内側より、入射電波の約１／４波長の距離に配置したものである。その他の構成は、図１に示した第１実施形態と同様の構成であるので、上記第１実施形態と同一符号を付して詳細な説明は省略する。
【００１７】
上記第２実施形態に示したようにホーンカバー２１の中央部内側より、入射電波の約１／４波長の距離に誘電体板２４を配置しても、位相を１８０°進めた反射波を発生させてホーンカバー２１による反射波を打ち消すことができる。
【００１８】
従って、第２実施形態においても、アンテナの受信レベルを低下させることなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘り良好な円偏波軸比特性を得ることができる。
【００１９】
なお、上記第２実施形態では、誘電体板２４を円形に形成した場合について示したが、その他の形状、例えば矩形に形成しても同様の効果を得ることができる。
【００２０】
（第３実施形態）
次に本発明の第３実施形態について説明する。
図４は、本発明の第３実施形態に係るパラボラアンテナ用１次放射器２０の構成を示す断面図である。この第３実施形態は、第１実施形態に示した筒状誘電体２３と共に第２実施形態に示した円形または矩形の誘電体板２４を設けたものである。すなわち、ホーンカバー２１の中央部内側に接するように筒状誘電体２３を設けると共に、ホーンカバー２１の中央部内側より、入射電波の約１／４波長の距離に誘電体板２４を配置したものである。上記筒状誘電体２３及び誘電体板２４は、支持部２２を介して円偏波発生器１３に一体成型される。上記筒状誘電体２３は、入射電波の約１／４波長に誘電体の波長短縮率を乗じた長さに設定する。また、誘電体板２４は、ホーンカバー２１の中央部内側より、入射電波の約１／４波長の奇数倍の距離に配置する。その他の構成は、図１に示した第１実施形態と同様の構成であるので、上記第１実施形態と同一符号を付して詳細な説明は省略する。
【００２１】
上記のように筒状誘電体２３及び誘電体板２４をホーンカバー２１から独立して設けることによって、ホーンカバー２１による反射波をより効果的に打ち消すことができ、アンテナの受信レベルを低下させることなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘り良好な円偏波軸比特性を得ることができる。
【００２２】
（第４実施形態）
次に本発明の第４実施形態について説明する。
図５は、本発明の第４実施形態に係る衛星放送受信用コンバータの構成を示す側面図である。この第４実施形態は、第１ないし第３実施形態に示したパラボラアンテナ用１次放射器２０を用いて衛星放送受信用コンバータ３０を構成した場合について示したものである。衛星放送受信用コンバータ３０は、パラボラアンテナ用１次放射器２０とコンバータ部３１を一体に構成したもので、コンバータ部３１はコンバータ出力端子３２を備えている。
【００２３】
上記パラボラアンテナ用１次放射器２０は、衛星から送られてくる円偏波の放送信号をパラボラ反射鏡を介して受信し、直線偏波の信号に変換してコンバータ部３１に出力する。コンバータ部３１は、図示しないが例えばＳＨＦアンプ回路、ミキサー回路、局部発振器、ＩＦアンプ回路等からなり、パラボラアンテナ用１次放射器２０で受信した信号をＳＨＦアンプ回路で増幅した後、ミキサー回路及び局部発振器からなる周波数変換回路により中間周波信号に変換し、更にＩＦアンプ回路で増幅してコンバータ出力端子３２から同軸ケーブルによりテレビ受信機へ出力する。
【００２４】
上記したように第１ないし第３実施形態に示したパラボラアンテナ用１次放射器２０を用いることにより、良好な反射損失特性並びに広周波数帯域に亘って良好な円偏波軸比特性を持つ衛星放送受信用コンバータ３０を構成することができる。
【００２５】
【発明の効果】
以上詳記したように本発明によれば、パラボラアンテナ用１次放射器において、ホーンカバーから独立して筒状誘電体を設け、円偏波発生器と一体に成型してホーン部の開口部中心付近に配置することにより、ホーンカバーを十分な薄さで成型することが可能となり、アンテナの受信レベルを低下させることなく、ホーン内部での多重反射を抑え、良好な反射損失特性並びに広周波数帯域に亘り良好な円偏波軸比特性を得ることができる。また、上記パラボラアンテナ用１次放射器をコンバータ部と一体に設けることにより、良好な電気特性を有する衛星放送受信用コンバータを構成することができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係るパラボラアンテナ用１次放射器の構成を示す断面図。
【図２】（ａ）は同実施形態における筒状誘電体を円偏波発生器とを一体成型した状態を示す断面図、（ｂ）は同左側面図。
【図３】本発明の第２実施形態に係るパラボラアンテナ用１次放射器の構成を示す断面図。
【図４】本発明の第３実施形態に係るパラボラアンテナ用１次放射器の構成を示す断面図。
【図５】本発明の第４実施形態に係る衛星放送受信用コンバータの構成を示す側面図。
【図６】従来のパラボラアンテナ用１次放射器の構成を示す断面図。
【符号の説明】
１１　ケース本体
１２　ホーン部
１３　円偏波発生器
１４　給電部
２０　パラボラアンテナ用１次放射器
２１　ホーンカバー
２２　支持部
２３　筒状誘電体
２４　誘電体板
３０　衛星放送受信用コンバータ
３１　コンバータ部
３２　コンバータ出力端子[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a primary radiator for a parabolic antenna and a converter for receiving a satellite broadcast having good circular polarization axis ratio characteristics over a wide band, for example, in a satellite broadcast receiving parabolic antenna.
[0002]
[Prior art]
Conventionally, a primary radiator used for a circularly polarized wave receiving parabolic antenna is configured as shown in FIG. In FIG. 6, reference numeral 11 denotes a bottomed cylindrical case main body, and a horn portion 12 for receiving a radio wave from a parabolic reflector (not shown) is provided integrally with a front opening of the case main body 11. In the case body 11, a circularly polarized wave generator 13 for converting between linearly polarized light and circularly polarized wave is disposed. The circularly polarized wave generator 13 is formed of a plate-like dielectric, and has a shape in which cutouts are provided on both left and right sides of a rectangular dielectric. In addition, the case main body 11 is provided with a power supply section 14 serving as a connection section with the circuit side at a position away from the cut section of the circularly polarized wave generator 13 by a predetermined distance. Note that the circularly polarized wave generator 13 is arranged at an angle of 45 ° with respect to the feeder 14.
[0003]
A horn cover 15 made of a dielectric material is provided in the opening of the horn section 12 to protect the primary radiator. Further, a projection 16 for improving the reflection loss characteristic and the circular polarization axis ratio characteristic is integrally provided inside the central portion of the horn cover 15. The length of the projection 16 is set to a length obtained by multiplying an odd multiple of about 波長 wavelength of the radio wave by a wavelength shortening rate of the dielectric.
[0004]
As described above, the dielectric horn cover 15 is generally used to protect the inside of the horn portion 12. However, by providing the horn cover 15, radio waves are reflected multiple times inside the primary radiator, and various characteristics of the primary radiator deteriorate. In particular, in the circular polarization axis ratio characteristic, the frequency band is narrow. In the related art, the reflection of radio waves is canceled by the projection 16 provided on the horn cover 15 by the horn cover 15. In other words, a reflected wave whose phase is advanced by 180 ° is generated by the dielectric protrusion 16 and acts so as to cancel the reflected wave from the horn cover 15.
[0005]
[Problems to be solved by the invention]
By providing the projections 16 inside the horn cover 15 as described above, it is possible to obtain good circular polarization axis ratio characteristics over a wide frequency band.
[0006]
However, in order to mold the dielectric projection 16 integrally with the horn cover 15, the desired dimensional accuracy cannot be obtained unless the dimension near the projection of the horn cover 15 is increased. When the dimension of the horn cover 15 is increased, there is a problem that the passage loss in the horn cover 15 increases, and the reception level of the overall parabolic antenna deteriorates.
[0007]
The present invention has been made in order to solve the above-mentioned problem, and it is not necessary to form the horn cover in a large thickness, suppresses multiple reflection inside the horn, has a good reflection loss characteristic, and has a good performance over a wide frequency band. It is an object of the present invention to provide a primary radiator for a parabolic antenna and a converter for receiving satellite broadcasting, which can obtain excellent circular polarization axis ratio characteristics and have excellent electric characteristics.
[0008]
[Means for Solving the Problems]
The present invention provides a primary radiator of a parabolic antenna for transmitting and receiving circularly polarized waves, which is provided in an opening of a case body and receives a radio wave from a parabolic reflector, and is provided in an opening of the horn. A dielectric horn cover, a power supply unit provided in the case main body, a circular polarization generator provided in the case main body, and made of a dielectric substance that changes a circularly polarized wave into a linearly polarized wave; And a cylindrical dielectric that is provided near the center of the opening and is provided integrally with the circularly polarized wave generator via a support.
[0009]
By providing the cylindrical dielectric independently of the horn cover as described above and molding it integrally with the circularly polarized wave generator, it is possible to mold the horn cover with a sufficient thickness, and reduce the reception level of the antenna. Without lowering, multiple reflection inside the horn can be suppressed, and a good reflection loss characteristic and a good circular polarization axis ratio characteristic over a wide frequency band can be obtained.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 is a sectional view showing a configuration of a primary radiator 20 for a parabolic antenna according to a first embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a cylindrical case body having a bottom. A horn portion 12 for receiving a radio wave from a parabolic reflector (not shown) is integrally provided in an opening on the front surface of the case body 11. Further, a horn cover 21 made of a dielectric material is provided in the opening of the horn portion 12 to protect the primary radiator.
[0011]
In the case body 11, a circular polarization generator 13 for converting between linearly polarized light and circularly polarized wave is disposed. The circularly polarized wave generator 13 is made of a plate-shaped dielectric, and has a structure in which cutouts are provided on both left and right sides of a rectangular dielectric. A power supply unit 14 is provided at a position spaced a predetermined distance from the notch of the generator 13. Note that the circularly polarized wave generator 13 is arranged at an angle of 45 ° with respect to the feeder 14.
[0012]
The circularly polarized wave generator 13 is provided with a rod-shaped support portion 22 on the horn portion 12 side, and a cylindrical dielectric 23 at the tip. The cylindrical dielectric 23 is provided integrally with the circularly polarized wave generator 13 via the support 22 so as to be located near the center of the opening of the horn 12.
[0013]
That is, the circularly polarized wave generator 13, the support portion 22, and the cylindrical dielectric 23 are integrally formed as shown in FIGS. 2 (a) and 2 (b). FIG. 2A is a cross-sectional view showing a state in which the circularly polarized wave generator 13, the support portion 22, and the cylindrical dielectric 23 are integrally molded, and FIG. 2B is a left side view of the same.
[0014]
The cylindrical dielectric member 23 is for canceling the reflection at the horn cover 21 and is set to a length obtained by multiplying the wavelength shortening rate of the dielectric by approximately one quarter wavelength of the incident radio wave. By providing the cylindrical dielectric 23 having the above-described length, a reflected wave whose phase is advanced by 180 ° can be generated, and the reflected wave by the horn cover 21 can be canceled. Although the cylindrical dielectric 23 is provided so as to be located near the center of the opening of the horn portion 12 as described above, the distal end may be in contact with the inner surface of the horn cover 21.
[0015]
As shown in the above embodiment, the horn cover 21 can be formed with a sufficient thickness by providing the cylindrical dielectric 23 independently of the horn cover 21 and integrally forming the horn cover 21 with the circularly polarized wave generator 13. This makes it possible to suppress multiple reflection inside the horn without lowering the reception level of the antenna, and to obtain a good reflection loss characteristic and a good circular polarization axis ratio characteristic over a wide frequency band. Further, by molding the cylindrical dielectric 23 integrally with the circularly polarized wave generator 13 via the support portion 22, the cylindrical dielectric 23 can be securely held at a predetermined position with a simple configuration, and at low cost. Can be configured.
[0016]
(2nd Embodiment)
Next, a second embodiment of the present invention will be described.
FIG. 3 is a sectional view showing a configuration of a primary radiator 20 for a parabolic antenna according to a second embodiment of the present invention. In the second embodiment, a thin circular dielectric plate 24 is provided in place of the cylindrical dielectric 23 shown in the first embodiment. That is, the dielectric plate 24 is integrally provided at the tip of the support portion 22 and is disposed at a distance of about １ ／ wavelength of the incident radio wave from the inside of the central portion of the horn cover 21. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same reference numerals as those in the first embodiment are given and the detailed description is omitted.
[0017]
As shown in the second embodiment, even if the dielectric plate 24 is disposed at a distance of about 1/4 wavelength of the incident radio wave from the inside of the center of the horn cover 21, a reflected wave whose phase is advanced by 180 ° is generated. Thus, the reflected wave from the horn cover 21 can be canceled.
[0018]
Therefore, also in the second embodiment, it is possible to suppress the multiple reflection inside the horn without lowering the reception level of the antenna and to obtain a good reflection loss characteristic and a good circular polarization axis ratio characteristic over a wide frequency band. Can be.
[0019]
In the second embodiment, the case where the dielectric plate 24 is formed in a circular shape is described. However, similar effects can be obtained by forming the dielectric plate 24 into another shape, for example, a rectangular shape.
[0020]
(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 4 is a sectional view showing a configuration of a primary radiator 20 for a parabolic antenna according to a third embodiment of the present invention. In the third embodiment, the circular or rectangular dielectric plate 24 shown in the second embodiment is provided together with the cylindrical dielectric 23 shown in the first embodiment. That is, a cylindrical dielectric 23 is provided so as to be in contact with the inside of the center of the horn cover 21, and the dielectric plate 24 is arranged at a distance of about ４ wavelength of the incident radio wave from the inside of the center of the horn cover 21. It is. The cylindrical dielectric 23 and the dielectric plate 24 are formed integrally with the circularly polarized wave generator 13 via the support 22. The cylindrical dielectric 23 is set to a length obtained by multiplying the wavelength shortening rate of the dielectric by about 1/4 wavelength of the incident radio wave. The dielectric plate 24 is arranged at a distance from the inside of the center of the horn cover 21 that is an odd multiple of about １ ／ wavelength of the incident radio wave. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same reference numerals as those in the first embodiment are given and the detailed description is omitted.
[0021]
By providing the cylindrical dielectric 23 and the dielectric plate 24 independently of the horn cover 21 as described above, it is possible to more effectively cancel the reflected wave from the horn cover 21 and reduce the reception level of the antenna. In addition, multiple reflection inside the horn can be suppressed, and a good reflection loss characteristic and a good circular polarization axis ratio characteristic over a wide frequency band can be obtained.
[0022]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
FIG. 5 is a side view showing a configuration of a converter for receiving satellite broadcasting according to a fourth embodiment of the present invention. The fourth embodiment shows a case where the satellite broadcast receiving converter 30 is configured using the parabolic antenna primary radiator 20 shown in the first to third embodiments. The satellite broadcast receiving converter 30 is configured by integrating the parabolic antenna primary radiator 20 and the converter unit 31, and the converter unit 31 has a converter output terminal 32.
[0023]
The parabolic antenna primary radiator 20 receives a circularly polarized broadcast signal transmitted from a satellite via a parabolic reflector, converts the signal into a linearly polarized signal, and outputs the signal to the converter unit 31. Although not shown, the converter unit 31 includes, for example, an SHF amplifier circuit, a mixer circuit, a local oscillator, an IF amplifier circuit, and the like. After the signal received by the primary radiator 20 for the parabolic antenna is amplified by the SHF amplifier circuit, the converter circuit 31 The signal is converted into an intermediate frequency signal by a frequency conversion circuit comprising a local oscillator, further amplified by an IF amplifier circuit, and output from a converter output terminal 32 to a television receiver via a coaxial cable.
[0024]
By using the parabolic antenna primary radiator 20 shown in the first to third embodiments as described above, a satellite having good reflection loss characteristics and good circular polarization axis ratio characteristics over a wide frequency band. The broadcast receiving converter 30 can be configured.
[0025]
【The invention's effect】
As described above in detail, according to the present invention, in the primary radiator for the parabolic antenna, the cylindrical dielectric is provided independently of the horn cover, and is integrally formed with the circularly polarized wave generator to form the opening of the horn. By locating near the center, it is possible to mold the horn cover with a sufficient thickness, suppress multiple reflection inside the horn without lowering the reception level of the antenna, and achieve good reflection loss characteristics and wide frequency Good circular polarization axis ratio characteristics can be obtained over the band. In addition, by providing the parabolic antenna primary radiator integrally with the converter unit, a satellite broadcast receiving converter having good electric characteristics can be configured.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a configuration of a primary radiator for a parabolic antenna according to a first embodiment of the present invention.
FIG. 2A is a cross-sectional view showing a state in which a cylindrical dielectric in the embodiment is integrally formed with a circularly polarized wave generator, and FIG. 2B is a left side view of the same.
FIG. 3 is a sectional view showing a configuration of a primary radiator for a parabolic antenna according to a second embodiment of the present invention.
FIG. 4 is a sectional view showing a configuration of a primary radiator for a parabolic antenna according to a third embodiment of the present invention.
FIG. 5 is a side view showing a configuration of a satellite broadcast receiving converter according to a fourth embodiment of the present invention.
FIG. 6 is a sectional view showing a configuration of a conventional primary radiator for a parabolic antenna.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Case main body 12 Horn part 13 Circularly polarized wave generator 14 Feeding part 20 Primary radiator for parabolic antenna 21 Horn cover 22 Support part 23 Cylindrical dielectric 24 Dielectric plate 30 Satellite broadcast receiving converter 31 Converter part 32 Converter output Terminal

Claims (6)

円偏波を送受信するパラボラアンテナの１次放射器において、ケース本体の開口部に設けられ、パラボラ反射鏡からの電波を受信するホーン部と、このホーン部の開口部に設けられる誘電体のホーンカバーと、前記ケース本体内に設けられる給電部と、前記ケース本体内に設けられ、円偏波を直線偏波に変更する誘電体からなる円偏波発生器と、前記ホーン部の開口部中心付近に設置され、前記円偏波発生器に支持部を介して一体に設けられる筒状誘電体とを具備したことを特徴とするパラボラアンテナ用１次放射器。In a primary radiator of a parabolic antenna for transmitting and receiving circularly polarized waves, a horn provided in an opening of a case body and receiving a radio wave from a parabolic reflector, and a dielectric horn provided in an opening of the horn A cover, a power supply unit provided in the case main body, a circular polarization generator provided in the case main body, and made of a dielectric substance that changes a circular polarization into a linear polarization, and a center of an opening of the horn part. A primary radiator for a parabolic antenna, comprising: a cylindrical dielectric that is installed in the vicinity and is provided integrally with the circularly polarized wave generator via a support. 前記筒状誘電体を入射電波の約１／４波長に誘電体の波長短縮率を乗じた長さに設定したことを特徴とする請求項１記載のパラボラアンテナ用１次放射器。2. The primary radiator for a parabolic antenna according to claim 1, wherein the length of the cylindrical dielectric is set to a value obtained by multiplying a wavelength shortening rate of the dielectric by about a quarter wavelength of the incident radio wave. 前記請求項１記載の１次放射器とコンバータ部を一体に構成したことを特徴とする衛星放送受信用コンバータ。2. A converter for receiving satellite broadcasting, wherein the primary radiator according to claim 1 and a converter section are integrally formed. 長方形の板状誘電体の左右両辺に切り込み部を設け、該板状誘電体の一方の切り込み部に支持部を介して反射波打ち消し用の誘電体板を一体成型し、前記板状誘電体により直線偏波と円偏波の変換を行なうと共に前記筒状誘電体により反射波を打ち消すことを特徴とする円偏波発生器。Cutouts are provided on both left and right sides of the rectangular plate-like dielectric, and a dielectric plate for canceling reflected waves is integrally formed on one cutout of the plate-like dielectric via a support portion, and the plate-like dielectric is used. A circularly polarized wave generator which performs conversion between linearly and circularly polarized waves and cancels reflected waves by the cylindrical dielectric. 長方形の板状誘電体の左右両辺に切り込み部を設け、該板状誘電体の一方の切り込み部に支持部を介して反射波打ち消し用の誘電体板を一体成型し、前記板状誘電体により直線偏波と円偏波の変換を行なうことを特徴とする円偏波発生器。Cutouts are provided on both left and right sides of the rectangular plate-like dielectric, and a dielectric plate for canceling reflected waves is integrally formed on one cutout of the plate-like dielectric via a support portion, and the plate-like dielectric is used. A circularly polarized wave generator, which performs conversion between linearly polarized waves and circularly polarized waves. 長方形の板状誘電体の左右両辺に切り込み部を設け、該板状誘電体の一方の切り込み部に支持部を介して反射波打ち消し用の筒状誘電体及び誘電体板を一体成型し、前記板状誘電体により直線偏波と円偏波の変換を行なうことを特徴とする円偏波発生器。Cut-off portions are provided on both left and right sides of the rectangular plate-like dielectric, and a cylindrical dielectric and a dielectric plate for canceling reflected waves are integrally molded through one of the cut-out portions of the plate-like dielectric via a support portion, A circularly polarized wave generator characterized in that a linearly polarized wave and a circularly polarized wave are converted by a plate-shaped dielectric.
JP2003194378A 2003-07-09 2003-07-09 Circular polarization generator Expired - Fee Related JP4047775B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085918A (en) * 2005-09-22 2007-04-05 Fujitsu Ten Ltd In-vehicle display device and display control program

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007085918A (en) * 2005-09-22 2007-04-05 Fujitsu Ten Ltd In-vehicle display device and display control program

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