Short-centimeter-waveband dual-polarized refrigeration receiver dewar

Abstract

The invention relates to a 1.3-centimeter-waveband dual-polarized refrigeration receiver dewar used for observing molecular spectra lines, pulsar and VLBI (very long baseline interferometry) in the radio astronomy. The receiver dewar consists of a dewar cavity, a shielding cover, a microwave window, a frame carrier, a support, a ring-shaped fixing frame, a soft connector, a feed source, a transition waveguide, a circle and square converter, a polarizer, a low-noise amplifier, a waveguide coaxial converter, an isolator, a semi-rigid coaxial cable, a microwave window sealing film, a microwave window fastening ring, an air-filled cavity, an air-filled cavity sealing film, an air-filled cavity fastening ring, an air cylinder and a refrigerator. The 1.3-centimeter-waveband dual-polarized refrigeration receiver dewar with high sensitivity has the advantages that the design scheme is more reasonable, good sealing performance is ensured, internal devices can be well fixed and supported, the refrigeration effect is more excellent, the stability is better, the sensitivity is higher, and the thermal radiation can be effectively isolated, thereby being capable of being better applied to high frequence radiation characteristic study of molecular spectra lines and pulsar and radio astronomy observation of VLBI.

Description

technical field [0001] The invention relates to a short centimeter band dual-polarization refrigeration receiver Dewar, in particular to a 1.3 centimeter band dual-polarization refrigeration receiver Dewar, which is a refrigeration receiver specially used for radio astronomy observation. [0002] Background technique [0003] Radio astronomy is a discipline that studies astronomical phenomena by receiving and processing radio radiation from cosmic celestial bodies, and is an important branch of modern astronomy. Radio astronomy uses radio reception technology as the means of observation, and the objects of observation cover all celestial bodies. The radio telescope is an important tool for radio astronomy observation, mainly composed of antenna system, receiver system, terminal system and other equipment. The main function of the receiver system is to amplify the weak electromagnetic wave signal collected by the antenna through the low noise amplifier, and then output it t...

AI Technical Summary

Problems solved by technology

On the one hand, the inside of the Dewar is a vacuum, while the outside is at normal atmospheric pressure. If a general material is used to seal the Dewar, since the pressure difference between the upper and lower sides of the sealing material is too large, it is necessary to place foam under the sealing material to support it. The price is that the insertion loss of the input signal becomes larger; on the other hand, the interior of the Dewar is a low-temperature cold stage, while the exterior is at room temperature. How to ensure the normal operation of the sealing material under the conditions of these two extreme temperature differences is worth considering.

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