KR100550212B1 - Primary radiator for parabolic antenna - Google Patents

Primary radiator for parabolic antenna Download PDF

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KR100550212B1
KR100550212B1 KR1020030027513A KR20030027513A KR100550212B1 KR 100550212 B1 KR100550212 B1 KR 100550212B1 KR 1020030027513 A KR1020030027513 A KR 1020030027513A KR 20030027513 A KR20030027513 A KR 20030027513A KR 100550212 B1 KR100550212 B1 KR 100550212B1
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vswr
primary radiator
ghz
horn antenna
protrusion
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KR1020030027513A
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KR20030086410A (en
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이케모토테츠야
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샤프 가부시키가이샤
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00Improving safety of vessels, e.g. damage control, not otherwise provided for
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating 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
    • G01F23/24Indicating 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00Thermometers specially adapted for specific purposes
    • G01K13/02Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02Measuring 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B2043/006Methods or installations specially adapted for detecting ingress of ambient water, e.g. leak detectors

Abstract

혼 안테나 본체(11)의 선단 개구부(12)에 수지제의 방수 커버(21)가 압입에 의해 끼워져 있고, 이 방수 커버(21)의 내벽면(22)에, VSWR을 억제하기 위한 원통 형상의 돌기부(23)가 형성되어 있다. 이 돌기부(23)는, 혼 안테나 본체(11)의 단부 개구부(12)측으로 돌출하여 형성되어 있고, 또한 혼 안테나 본체(11)의 중심축 L1과 동심축상으로 배치되어 있다. 또한, 돌기부(23)의 개구 선단부에는, 고리 모양의 단차부(24)가 형성되어 있고, 외측의 높은 단차 돌기 부분(25)이 낮은 주파수의 VSWR을 억제하고, 내측의 낮은 단차 돌기부(26)가 높은 주파수의 VSWR을 억제하는 구조로 되어 있다.The waterproof cover 21 made of resin is inserted into the tip opening 12 of the horn antenna main body 11 by press-fitting, and a cylindrical shape for suppressing the VSWR on the inner wall surface 22 of the waterproof cover 21. The protrusion part 23 is formed. The protrusion 23 is formed to protrude toward the end opening 12 side of the horn antenna main body 11 and is disposed concentrically with the central axis L1 of the horn antenna main body 11. In addition, an annular stepped portion 24 is formed at the opening tip of the protrusion 23, and the outer high stepped protrusion 25 suppresses the low frequency VSWR and the inner low stepped protrusion 26. Has a structure of suppressing VSWR of high frequency.

Description

파라볼라 안테나용 1차 방사기{PRIMARY RADIATOR FOR PARABOLIC ANTENNA}Primary radiator for parabolic antenna {PRIMARY RADIATOR FOR PARABOLIC ANTENNA}

도1은, 본 발명의 실시예 1에 따른 파라볼라 안테나용 1차 방사기의 단면도이다.1 is a cross-sectional view of a primary radiator for a parabolic antenna according to Embodiment 1 of the present invention.

도2는, 본 발명의 실시예 2에 따른 파라볼라 안테나용 1차 방사기의 단면도이다.Fig. 2 is a sectional view of the primary radiator for parabolic antenna according to the second embodiment of the present invention.

도3은, 일반적인 파라볼라 안테나의 개략 측면도이다.3 is a schematic side view of a general parabolic antenna.

도4는, 종래의 파라볼라 안테나용 1차 방사기의 단면도이다.4 is a cross-sectional view of a conventional radiator for a parabolic antenna.

본 발명은, 위성 방송 수신용 파라볼라 안테나에 관한 것으로, 특히 VSWR을 조정하기 위한 1차 방사기의 구조에 관한 것이다.The present invention relates to a parabolic antenna for satellite broadcast reception, and more particularly to the structure of a primary radiator for adjusting VSWR.

도3은 일반적인 파라볼라 안테나의 개략 측면도, 도4는 종래의 파라볼라 안테나용 1차 방사기의 단면도이다.3 is a schematic side view of a general parabolic antenna, and FIG. 4 is a cross-sectional view of a conventional radiator for a conventional parabola antenna.

파라볼라 안테나에 의한 위성 방송의 수신은, 도3에 도시된 바와 같이, 안테나부(71)에서 반사된 약 12GHz대의 신호 S가, 1차 방사기(72)의 개구부(73)에 집약되도록 되어 있다. 그리고, 1차 방사기(72)를 통과한 신호는, LNB(Low Noise Block down-converter)(74)에 의해 12GHz대에서 1GHz대로 주파수 변환되고, 이 주파수 변환된 신호가 케이블(75)을 통해 옥내 수신기(BS(또는 CS) 튜너, 또는 내장 TV(또는 VTR))(76)에 입력되도록 되어 있다.As shown in Fig. 3, the satellite broadcast by the parabola antenna is such that the signal S reflected by the antenna section 71 is concentrated in the opening 73 of the primary radiator 72. And the signal which passed the primary radiator 72 is frequency-converted from 12 GHz to 1 GHz by the Low Noise Block down-converter (LNB) 74, and this frequency-converted signal is indoors through the cable 75. A receiver (BS (or CS) tuner or built-in TV (or VTR)) 76 is input.

여기서, 파라볼라 안테나용의 1차 방사기(72)는, 도4에 도시된 구조로 되어 있다.Here, the primary radiator 72 for the parabola antenna has the structure shown in FIG.

즉, 혼(horn) 안테나 본체(81)는 원통 형상으로 형성되어 있고, 부채 모양(扇狀)으로 퍼진 선단(先端) 개구부(82)에 방수 커버(91)가 압입(壓入)에 의해 끼워져 있다. 이 방수 커버(91)는, 외부로부터 1차 방사기의 혼 안테나 본체(81) 내부로 비 등의 수분이 들어가지 않도록 하기 위한 것이다. 그 때문에, 혼 안테나 본체(81)의 단부 개구부(82)와 방수 커버(91) 사이에는, 지수(止水)용의 O링(100)을 삽입함으로써, 방수 기능을 유지하고 있다.That is, the horn antenna main body 81 is formed in the cylindrical shape, and the waterproof cover 91 is fitted by press-fitting in the front end opening 82 which spread in fan shape. have. This waterproof cover 91 is for preventing moisture, such as rain, from entering into the horn antenna main body 81 of the primary radiator from the outside. Therefore, the water-proof function is maintained by inserting the O-ring 100 for the still water between the end opening 82 of the horn antenna main body 81 and the waterproof cover 91.

이 방수 커버(91)는, 플라스틱 등의 수지로 형성되어 있기 때문에, 공기에 대해 비교적 높은 유전율을 갖고 있다. 그 때문에, 방수 커버(91)의 형상이, 1차 방사기를 포함한 입력 VSWR에 크게 영향을 주게 된다.Since the waterproof cover 91 is made of 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.

예컨대, 일본 국내에서 위성 방송 BS(전송 주파수 11.7∼12.OGHz : 대역폭 300MHz)를 수신할 때, 이 방수 커버(91)에 의해 VSWR이 영향을 받는다.For example, when receiving a satellite broadcast BS (transmission frequency 11.7 to 12 GHz: bandwidth 300 MHz) in Japan, the VSWR is affected by this waterproof cover 91.

그 때문에, 이 방수 커버(91)의 내벽면(92)에는, VSWR을 억제하기 위한 원통 형상의 돌기부(92)가 형성되어 있다. 이 돌기부(92)는 혼 안테나 본체(81)의 단부 개구부(82)측으로 돌출하여 형성되어 있고, 또한 혼 안테나 본체(81)의 중심축 L1과 동심축상으로 배치되어 있다. 이와 같이 돌기부(92)의 내부를 공동(空洞)으로 함으로써, 입력 VSWR을 억제하고 있다.Therefore, the cylindrical protrusion part 92 for suppressing VSWR is formed in the inner wall surface 92 of this waterproof cover 91. As shown in FIG. The protrusion 92 protrudes toward the end opening 82 of the horn antenna main body 81 and is disposed concentrically with the central axis L1 of the horn antenna main body 81. Thus, the input VSWR is suppressed by making the inside of the projection part 92 empty.

그런데, 최근 일본 국내에서는, 방송 위성(BS)과 동일한 동경 110°의 위치에 새로이 CS 디지털 방송용의 위성(전송 주파수 12.2GHz∼12.75GHz : 대역폭 1050MHz)이 쏘아올려져 서비스를 개시하고 있다. 그 때문에, 1개의 파라볼라 안테나에서 BS 및 디지털 CS의 양방을 수신하기 위해서는, 입력 주파수 11.7∼ 12.75GHz(대역폭 1050MHz)에 대해 입력 VSWR이 적은 양호한 1차 방사기가 필요하게 되고 있다.In recent years, however, in Japan, a satellite for CS digital broadcasting (transmission frequency 12.2 GHz to 12.75 GHz: bandwidth 1050 MHz) has been newly launched at the same 110-degree eastward position as the broadcast satellite BS to start a service. Therefore, in order to receive both BS and digital CS in one parabola 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).

그렇지만, 상기한 종래의 파라볼라 안테나용 1차 방사기(72)에서는, 대역폭이 500∼800MHz 정도의 주파수에 대해서는 VSWR을 양호하게 억제할 수 있지만, 1050MHz의 대역폭까지 VSWR을 양호하게 억제하는 것이 어렵다고 하는 문제가 있었다. 그리고, VSWR을 억제하는 양호한 특성이 얻어지지 않는 경우에는, 안테나 토탈의 교차 편파 특성을 23dB 이상 얻는 것이 어렵다고 하는 문제도 있었다.However, in the above-described conventional parabolic antenna primary radiator 72, the VSWR can be suppressed well for a frequency of about 500 to 800 MHz, but it is difficult to suppress the VSWR to a bandwidth of 1050 MHz well. There was. And when the favorable characteristic which suppresses VSWR is not acquired, there also existed a problem that it is difficult to acquire the cross polarization characteristic of antenna total more than 23dB.

본 발명은 관계되는 문제점을 해결하기 위해 창안된 것으로, 그 목적은, 1050MHz의 대역폭까지 VSWR을 양호하게 억제할 수 있는 구조의 파라볼라 안테나용 1차 방사기를 제공하는 것에 있다.The present invention was devised to solve the related problems, and an object thereof is to provide a primary radiator for a parabolic antenna having a structure capable of suppressing VSWR to a bandwidth of 1050 MHz.

상기 목적을 달성하기 위해, 본 발명의 파라볼라 안테나용 1차 방사기는, 혼 안테나 본체의 단부 개구부에 방수 커버가 제공되고, 이 방수 커버의 내벽면에, 상기 단부 개구부로 향하고, 또한 상기 혼 안테나 본체의 중심축과 동심축상으로 배치된 유전체로 이루어지는 원통 형상의 돌기부가 형성된 파라볼라 안테나용 1차 방 사기에 있어서, 상기 돌기부의 개구 선단부에 고리 모양(環狀)의 단차부가 형성되어 있다. 이와 같이, 돌기부의 개구 선단부에 고리 모양의 단차부를 형성함으로써, 외측의 높은 단차 돌기가 낮은 주파수의 VSWR을 억제하고, 내측의 낮은 단차 돌기가 높은 주파수의 VSWR을 억제할 수 있어, 1050MHz의 넓은 대역폭에 걸쳐, 입력 VSWR을 효과적으로 억제하는 것이 가능하게 된다. 또한, 후단으로 이어지는 블록의 교차 편파 특성을 열화시키지 않고, 양호한 교차 편파 특성(23dB 이상)을 실현할 수 있다.In order to achieve the above object, 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 body, and faces an inner wall surface of the waterproof cover toward the end opening, and furthermore, In the primary barrier for a parabola antenna having a cylindrical projection formed of a dielectric arranged concentrically with the central axis of the antenna, an annular step is formed at the opening end of the projection. In this way, by forming an annular stepped portion at the opening end of the protruding portion, the outer high stepped projection can suppress a low frequency VSWR and the inner low stepped projection can suppress a high frequency VSWR, thereby providing a wide bandwidth of 1050 MHz. It is possible to effectively suppress the input VSWR. Further, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block leading to the next stage.

또한, 본 발명의 파라볼라 안테나용 1차 방사기는, 혼 안테나 본체의 단부 개구부에 방수 커버가 제공된 파라볼라용 1차 방사기에 있어서, 상기 방수 커버의 내벽면에, 상기 단부 개구부로 향하고, 또한 상기 혼 안테나 본체의 중심축과 동심축상으로 배치된 유전체로 이루어지는 원통 형상의 돌기부가 복수 제공되는 동시에, 외측의 돌기부에 대해 내측의 돌기부의 높이가 낮게 형성되어 있다. 이에 의해, 외측의 높은 돌기부가 낮은 주파수의 VSWR을 억제하고, 내측의 낮은 돌기부가 높은 주파수의 VSWR을 억제할 수 있어, 1050MHz의 넓은 대역폭에 걸쳐, 입력 VSWR을 효과적으로 억제하는 것이 가능하게 된다. 또한, 후단으로 이어지는 블록의 교차 편파 특성을 열화시키지 않고, 양호한 교차 편파 특성(23dB 이상)을 실현할 수 있다.Further, the primary radiator for a parabolic antenna of the present invention is a parabolic primary radiator provided with a waterproof cover at an end opening of a horn antenna main body, which is directed toward the end opening of the inner wall of the waterproof cover, and further comprises the horn antenna. A plurality of cylindrical protrusions made of a dielectric arranged concentrically with the central axis of the main body are provided, and the height of the inner protrusions is lower than the outer protrusions. As a result, the outer high protrusions can suppress the low frequency VSWR, and the inner low protrusions can suppress the high frequency VSWR, so that the input VSWR can be effectively suppressed over a wide bandwidth of 1050 MHz. Further, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block leading to the next stage.

이하, 본 발명의 실시예에 대해서, 도면을 참조하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

[실시예 1]Example 1

도1은, 본 실시예 1의 파라볼라 안테나용 1차 방사기의 단면도를 도시하고 있다.Fig. 1 shows a cross-sectional view of the primary radiator for parabolic antenna of the first embodiment.

이 파라볼라 안테나용 1차 방사기는, 혼 안테나 본체(11)가 원통 형상으로 형성되고 있고, 부채 모양으로 퍼진 선단 개구부(12)에, 수지제(樹脂製)의 방수 커버(21)가 압입에 의해 끼워져 있다. 또한, 혼 안테나 본체(11)의 단부 개구부(12)와 방수 커버(21) 사이에는, 지수(止水)용의 O링(13)이 삽입되어 있다.The primary radiator for the parabolic antenna has a horn antenna body 11 formed in a cylindrical shape, and the waterproof cover 21 made of resin is press-fitted into the front end opening 12 spread in a fan shape. It is fitted. In addition, an O-ring 13 for exponential water is inserted between the end opening 12 of the horn antenna main body 11 and the waterproof cover 21.

또한, 이 방수 커버(21)의 내벽면(22)에는, VSWR을 억제하기 위한 원통 형상의 돌기부(23)가 형성되어 있다. 이 돌기부(23)는, 혼 안테나 본체(11)의 단부 개구부(12)측으로 돌출하여 형성되어 있고, 또한 혼 안테나 본체(11)의 중심축 L1과 동심축상으로 배치되어 있다.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 to protrude toward the end opening 12 side of the horn antenna main body 11 and is disposed concentrically with the central axis L1 of the horn antenna main body 11.

이와 같은 구성의 돌기부(23)에 있어서, 본 실시예 1에서는, 돌기부(23)의 개구 선단부에 고리 모양의 단차부(24)가 형성되어 있다. 이와 같이, 돌기부(23)의 개구 선단부에 고리 모양의 단차부(24)를 형성함으로써, 외측의 높은 단차 돌기 부분(25)이 낮은 주파수의 VSWR을 억제하고, 내측의 낮은 단차 돌기부(26)가 높은 주파수의 VSWR을 억제할 수 있어, 1050MHz의 넓은 대역폭에 걸쳐, 입력 VSWR을 효과적으로 억제할 수 있다. 또한, 후단으로 이어지는 블록의 교차 편파 특성을 열화시키지 않고, 양호한 교차 편파 특성(23dB 이상)을 실현할 수 있다.In the protrusion part 23 of such a structure, in this Embodiment 1, the annular step part 24 is formed in the opening front-end | tip of the protrusion part 23. As shown in FIG. Thus, by forming the annular stepped portion 24 at the opening tip of the protrusion 23, the outer high stepped protrusion 25 suppresses the low frequency VSWR, and the inner low stepped protrusion 26 The high frequency VSWR can be suppressed, effectively suppressing the input VSWR over a wide bandwidth of 1050 MHz. Further, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block leading to the next stage.

[실시예 2]Example 2

도2는, 본 실시예 2의 파라볼라 안테나용 1차 방사기의 단면도를 도시하고 있다.Fig. 2 shows a cross-sectional view of the primary radiator for parabolic antenna of the second embodiment.

이 파라볼라 안테나용 1차 방사기는, 혼 안테나 본체(11)가 원통 형상으로 형성되어 있고, 부채 모양으로 퍼진 선단 개구부(12)에, 수지제의 방수 커버(31)가 압입에 의해 끼워져 있다. 또한, 혼 안테나 본체(11)의 단부 개구부(12)와 방수 커버(31) 사이에는, 지수(止水)용의 O링(13)이 삽입되어 있다.The primary radiator for the parabolic antenna has a horn antenna main body 11 formed in a cylindrical shape, and a waterproof cover 31 made of resin is fitted into the front end opening 12 spread in a fan shape by press fitting. In addition, an O-ring 13 for exponential water is inserted between the end opening 12 of the horn antenna main body 11 and the waterproof cover 31.

또한, 이 방수 커버(31)의 내벽면(32)에는, VSWR을 억제하기 위한 원통 형상의 복수(본 실시예 2에서는, 2개)의 돌기부(33,34)가 형성되어 있다. 이들 돌기부(33,34)는, 혼 안테나 본체(11)의 단부 개구부(12)측으로 돌출하여 형성되어 있고, 또한 혼 안테나 본체(11)의 중심축 L1과 동심축상으로 배치되어 있다. 또한, 이들 돌기부(33,34)의 높이는, 외측의 대 직경의 돌기부(33)에 대해, 내측의 소 직경의 돌기부(34) 쪽이 낮게 되도록 형성되어 있다.In addition, the inner wall surface 32 of the waterproof cover 31 is provided with a plurality of cylindrical projections (two and two in the second embodiment) for projecting the VSWR. These protrusions 33 and 34 protrude toward the end opening 12 side of the horn antenna main body 11 and are arranged concentrically with the central axis L1 of the horn antenna main body 11. In addition, the height of these protrusions 33 and 34 is formed so that the inner side of the small diameter protrusion part 34 may become low with respect to the outer side large diameter protrusion part 33. As shown in FIG.

이에 의해, 외측의 높은 돌기부(33)가 낮은 주파수의 VSWR을 억제하고, 내측의 낮은 돌기부(34)가 높은 주파수의 VSWR을 억제할 수 있어, 1050MHz의 넓은 대역폭에 걸쳐, 입력 VSWR을 효과적으로 억제할 수 있다. 또한, 후단으로 이어지는 블록의 교차 편파 특성을 열화시키지 않고, 양호한 교차 편파 특성(23dB 이상)을 실현할 수 있다.Thereby, the outer high protrusion part 33 can suppress the low frequency VSWR, and the inner low protrusion part 34 can suppress the high frequency VSWR, and can effectively suppress an input VSWR over a wide bandwidth of 1050 MHz. Can be. Further, a good cross polarization characteristic (23 dB or more) can be realized without degrading the cross polarization characteristic of the block leading to the next stage.

또, 상기 실시예 2에서는, 돌기부를 동심축상으로 2개 제공한 구성으로 하고 있지만, 동심축상으로 3개 이상 제공하는 것도 가능하다. 이 경우에는, 내측의 돌기부 정도, 그 높이가 낮게 되도록 형성되면 좋다.In addition, in the said Example 2, although it is set as the structure which provided two projection parts concentrically, it is also possible to provide three or more concentrically. In this case, what is necessary is just to form so that the inner processus | protrusion part and height may become low.

본 발명에 의하면, 1050MHz의 대역폭까지 VSWR을 양호하게 억제할 수 있는 구조의 파라볼라 안테나용 1차 방사기를 제공할 수 있다.According to the present invention, it is possible to provide a primary radiator for a parabolic antenna having a structure capable of satisfactorily suppressing VSWR up to a bandwidth of 1050 MHz.

Claims (4)

혼 안테나 본체의 단부 개구부에 방수 커버가 제공되고, 이 방수 커버의 내벽면에, 상기 단부 개구부로 향하고, 또한 상기 혼 안테나 본체의 중심축과 동심축상으로 배치된 유전체로 이루어지는 원통 형상의 돌기부가 형성된 파라볼라 안테나용 1차 방사기에 있어서,A watertight cover is provided at an end opening of the horn antenna body, and a cylindrical protrusion is formed on the inner wall surface of the watertight cover toward the end opening and made of a dielectric disposed concentrically with the central axis of the horn antenna body. In a primary radiator for a parabola antenna, 상기 돌기부의 개구 선단부에 고리 모양의 단차부가 형성되어 있는 것을 특징으로 하는 파라볼라 안테나용 1차 방사기.A parabolic antenna primary radiator, characterized in that an annular stepped portion is formed at the opening end of the projection. 제1항에 있어서, 외측의 높은 단차 돌기가, 입력 주파수가 11.7~12.75 GHz인 경우, 11.7~12.0 GHz의 낮은 주파수대의 VSWR을 억제하고, 내측의 낮은 단차 돌기가, 입력 주파수가 11.7~12.75 GHz인 경우, 12.0~12.75 GHz의 높은 주파수대의 VSWR을 억제하는 것을 특징으로 하는 파라볼라 안테나용 1차 방사기.2. The low frequency step of 11.7 to 12.0 GHz suppresses the VSWR of the low frequency band of 11.7 to 12.0 GHz, and the inner low stepped protrusion is 11.7 to 12.75 GHz. In the case of, the primary radiator for a parabolic antenna, characterized in that to suppress the VSWR of high frequency band of 12.0 ~ 12.75 GHz. 혼 안테나 본체의 단부 개구부에 방수 커버가 제공된 파라볼라 안테나용 1차 방사기에 있어서,In the primary radiator for a parabolic antenna provided with a waterproof cover in the end opening of the horn antenna body, 상기 방수 커버의 내벽면에, 상기 단부 개구부로 향하고, 또한 상기 혼 안테나 본체의 중심축과 동심축상으로 배치된 유전체로 이루어지는 원통 형상의 돌기부가 복수 제공되는 동시에, 외측의 돌기부에 대해 내측의 돌기부의 높이가 낮게 형성되어 있는 것을 특징으로 하는 파라볼라 안테나용 1차 방사기.The inner wall surface of the waterproof cover is provided with a plurality of cylindrical protrusions made of a dielectric arranged concentrically with the central axis of the horn antenna body, and at the same time the inner protrusions Primary radiator for a parabolic antenna, characterized in that the height is formed low. 제3항에 있어서, 외측의 높은 돌기부가, 입력 주파수가 11.7~12.75 GHz인 경우, 11.7~12.0 GHz의 낮은 주파수대의 VSWR을 억제하고, 내측의 낮은 돌기부가, 입력 주파수가 11.7~12.75 GHz인 경우, 12.0~12.75 GHz의 높은 주파수대의 VSWR을 억제하는 것을 특징으로 하는 파라볼라 안테나용 1차 방사기.The case of claim 3, wherein the outer high protrusions suppress the VSWR of the low frequency band of 11.7 to 12.0 GHz, and the inner low protrusions have the input frequency of 11.7 to 12.75 GHz. The primary radiator for parabolic antennas, characterized in that it suppresses the VSWR of the high frequency band of 12.0 ~ 12.75 GHz.
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