JPS618875U

JPS618875U - System noise temperature measurement circuit

Info

Publication number: JPS618875U
Application number: JP9326584U
Authority: JP
Inventors: 光元飯田
Original assignee: 日本電気株式会社
Priority date: 1984-06-22
Filing date: 1984-06-22
Publication date: 1986-01-20

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案によるシステム雑音温度測定回路の実施
例を示す概略図で、同図ａはカセグレンアンテナを用い
た場合、同図ｂはパラボラアンテナを用いた場合、同図
Ｃはホーンアンテナを用いた場合をそれぞれ示している
。第２図は本考案に用いる各種電波吸収体キャップの実施
例を示す斜視図で、同図ａは中空円錐形、同図ｂは中空
角錐形、同図Ｃは波状板形、同図ｄは整合層付平板形を
それぞれ示している。第３図および第４図は従来のシステム雑音温度測定回路
の構成例を示す概略図、第５図および第６図は雑音校正
回路の構成例を示す斜視図である。１，１４．２４・・・低雑音増幅器、２，１５
，２５・・・テストレシーバ、３・・・ホーンアンテナ
、４，７，１０・・・電波吸収体キャップ、５，８・・
・反射鏡、１２．２２・・・分岐給電部、１３・・・導
波管切替器、１６・・・標準雑音発生器、１８・・・整
合層付電波吸収体、２３・・・雑音校正回路、３１・・
・矩形導波管、３２・・・抵抗板、３３・・・スリット
、４１・・・方向性結合器、４２・・・雑音発生器、４
３・・・無反射終端器。Fig. 1 is a schematic diagram showing an embodiment of the system noise temperature measurement circuit according to the present invention, in which Fig. 1a shows a case where a Cassegrain antenna is used, Fig. 1b shows a case where a parabolic antenna is used, and Fig. 1c shows a case where a horn antenna is used. The cases in which they were used are shown. Fig. 2 is a perspective view showing examples of various radio wave absorber caps used in the present invention, in which a is a hollow cone, b is a hollow pyramid, C is a corrugated plate, and d is a wavy plate. Each figure shows a flat plate with matching layer. 3 and 4 are schematic diagrams showing an example of the configuration of a conventional system noise temperature measuring circuit, and FIGS. 5 and 6 are perspective views showing an example of the configuration of a noise calibration circuit. 1, 14. 24...Low noise amplifier, 2,15
, 25... Test receiver, 3... Horn antenna, 4, 7, 10... Radio wave absorber cap, 5, 8...
・Reflector, 12.22... Branch feeder, 13... Waveguide switch, 16... Standard noise generator, 18... Radio wave absorber with matching layer, 23... Noise calibration Circuit, 31...
・Rectangular waveguide, 32... Resistance plate, 33... Slit, 41... Directional coupler, 42... Noise generator, 4
3...Reflection-free terminator.

Claims

[Scope of utility model registration request]

In a system noise temperature measurement circuit necessary for G/T measurement in receiving terminal equipment equipped with an aperture antenna, a primary radiator of the aperture antenna has a shape that satisfies matching conditions with the primary radiator in front of the aperture. A system noise temperature measuring circuit characterized in that a radio wave absorber cap is removable and the system noise temperature is determined from the output level ratio of a test receiver when the radio wave absorber cap is attached and removed.