An x-band refrigeration polarizer cooling structure device

Abstract

The invention relates to an X-waveband refrigeration polarizer cooling structure device which comprises a polarizer, an upper waveguide cavity and a lower waveguide cavity. One end of the polarizer is connected with the cold end of a refrigerating machine through heat conducting strips, and the other end of the polarizer is connected with the end, not opposite to the upper waveguide cavity, of the lower waveguide cavity. A slot waveguide, the polarizer and the cold end of the refrigerating machine are located inside a vacuum cavity. The end, not opposite to the lower waveguide cavity, of the upper waveguide cavity is connected with the vacuum cavity. The heat conducting strips are a plurality of copper foils, wherein the ends of the copper foils are welded in a pressure mode. The vacuum cavity comprises a cavity body and a cover plate fixedly connected with the cavity body. A thermal insulation cylinder is arranged on the periphery of the slot waveguide, one end of the thermal insulation cylinder is fixedly connected with the inner wall of the cavity body, and the other end of the thermal insulation cylinder is fixedly connected with the end, connected with the lower waveguide cavity, of the polarizer. The upper waveguide cavity is fixedly connected with the cover plate, a sealing film is arranged between the upper waveguide cavity and the cover plate, and a gasket is arranged between the thermal insulation cylinder and the polarizer. According to the X-waveband refrigeration polarizer cooling structure device, due to the fact that the polarizer works under the vacuum and low-temperature environment, the equivalent noise temperature of the polarizer is reduced, and the quality of received signals is improved.

Description

technical field [0001] The invention specifically relates to an X-band refrigeration polarizer cooling structure device. Background technique [0002] In the fields of long-distance detection and radio astronomy, although large-area antennas are used to receive signals, the received signals are very weak, so signal amplification must be performed before signal mediation and data processing. Because the quality of signal reception depends on the signal-to-noise ratio, in order to obtain a higher signal-to-noise ratio, it is necessary to further reduce the noise level of the ground receiving system and obtain the highest possible quality factor G / T value of the antenna. [0003] At present, cryogenic refrigeration low noise amplifier technology is usually used to reduce the noise of the receiving system. However, because the polarizer of the pre-stage link connected to the low-noise amplifier works in a normal temperature environment, the noise introduced by the loss of the p...

AI Technical Summary

Problems solved by technology

However, because the polarizer of the pre-stage link connected to the low-noise amplifier works in a normal temperature environment, the noise introduced by the loss of the polarizer will be directly superimposed on the noise of the receiving system, which will increase the noise level of the ground receiving system, and then make the signal Reception quality degrades

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