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Spherical vacuum microwave window

A vacuum microwave and window technology, applied in the field of receivers, can solve the problems of reducing receiver system sensitivity, increasing insertion loss and voltage standing wave ratio, increasing dielectric materials, etc., achieving good sealing performance, ensuring vacuum degree, reducing Effect of Noise Temperature

Inactive Publication Date: 2018-11-13
XINJIANG ASTRONOMICAL OBSERVATORY CHINESE ACADEMY OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

In order to reduce its influence, the size of the vacuum microwave window must be increased. In order to withstand greater atmospheric pressure, the thickness of the dielectric material needs to be increased, which increases the thickness of the dielectric material of the microwave vacuum window, thereby increasing its insertion loss and VSWR, reducing receiver system sensitivity

Method used

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Embodiment

[0017] A kind of spherical vacuum microwave window of the present invention, this vacuum microwave window is made up of hemispherical dielectric thin shell, feed source, pressure plate, screw, refrigeration dewar, sealing ring, radiation mouth surface (such as figure 1 As shown), the feed source 2 is installed inside the refrigeration Dewar 5, and the hemispherical dielectric shell 1 is fixed on the top of the refrigeration Dewar 5 through the pressure plate 3 and the screw 4, and the hemispherical dielectric shell 1 isolates the feed source 2 from the external environment, And use the sealing ring 6 to isolate the air, the center of the hemispherical dielectric thin shell 1 coincides with the phase center of the feed source 2, and the radiation port surface 7 of the feed source 2 (such as figure 2 As shown) toward the hemispherical dielectric shell 1, the connecting surface of the hemispherical dielectric shell 1 and the cooling Dewar 5 is 4 cm downwards from the upper end of...

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Abstract

The invention relates to a spherical vacuum microwave window. The spherical vacuum microwave window comprises a semispherical medium thin shell, a feed source, a pressing plate, screws, a refrigerating Dewar vessel, a sealing ring and a radiation opening face, wherein the semispherical medium thin shell is machined by a high-strength, low-dielectric-constant, low-loss and tangent-angle medium material. The spherical vacuum microwave window has the advantages that the mounting flanges of the semispherical medium thin shell are fixed at positions lower than the feed source opening face, so thatlow-loss wave transmission and air isolation are achieved, and the influence of the fixing flanges on the radiation pattern of the feed source is lowered effectively; the vacuum microwave window is reasonable in design scheme, applicable to various receiver systems which need to perform overall refrigeration on the feed source, capable of effectively guaranteeing the Dewar vessel vacuum degree ofa receiver and capable of reducing receiver noise temperature and increasing sensitivity.

Description

technical field [0001] The invention relates to a spherical vacuum microwave window which can effectively reduce the influence on the radiation pattern and voltage standing wave ratio of the feed source, and is specially used for various receivers which need to refrigerate the feed source as a whole. Background technique [0002] Radio astronomy is the study of astronomical phenomena by observing radio waves from celestial bodies. Pulsar surveys of the entire Milky Way, large-field mapping of interstellar dust and massive interstellar molecular cloud cores in star-forming regions, search for transient sources on time scales ranging from milliseconds to years, and search for all stars at redshifts up to 1 The all-sky neutral hydrogen survey of galaxies to determine the basic structure and evolution of the universe and many other breakthrough scientific researches have put forward higher requirements for radio telescopes and their receiver systems, especially wideband receiver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/08H01Q1/00H01Q1/42H01Q1/50
CPCH01P1/08H01Q1/02H01Q1/42H01Q1/50
Inventor 马军伍洋王凯曹亮
Owner XINJIANG ASTRONOMICAL OBSERVATORY CHINESE ACADEMY OF SCI
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