Radio frequency low-temperature low-noise amplifier system of thermoelectric refrigeration

Abstract

The invention relates to a radio frequency low-temperature low-noise amplifier system of thermoelectric refrigeration, belonging to the technical field of microwave communication. The system mainly comprises a sealing heat insulation cavity, a thermoelectric cooling assembly arranged in the cavity, a radio frequency low-temperature and low-noise amplifier, a temperature sensor, a heat dissipation assembly, a heat conduction assembly and an electric control assembly, wherein the radio frequency low-temperature and low-noise amplifier, the thermoelectric cooling assembly and the heat dissipation assembly are sequentially connected through the heat conduction assembly; the electric control assembly is respectively connected with the thermoelectric cooling assembly, the heat dissipation assembly and the radio frequency low-temperature and low-noise amplifier; the temperature sensor is arranged on one side of the heat dissipation assembly, which is close to the thermoelectric cooling assembly, and is connected with the electric control assembly; and the radio frequency input interface and the radio frequency output interface in two ends of the radio frequency low-temperature and low-noise amplifier are fixed in two end walls of the sealing heat insulation cavity. The radio frequency low-temperature low-noise amplifier system of thermoelectric refrigeration ensures vibration and water prevention and heat insulation when the low-temperature and low-noise radio frequency amplifier works in low-temperature, and meanwhile is capable of improving the sensitivity of the radio frequency receiving system.

Description

technical field [0001] The invention belongs to the technical field of microwave communication equipment, and in particular relates to the structure design of a low-noise amplifier used in reducing receivers by thermoelectric refrigeration. Background technique [0002] The wireless radio frequency communication module is mainly composed of a radio frequency transmitting module and a receiving module. The receiving module mainly selects useful signals from numerous wireless signals in the space and amplifies them for signal processing by the back-end radio frequency link. Due to the interference and loss on the transmission path and the multipath effect, the signal received by the antenna is weak and changeable, so the sensitivity of the receiver is very high, and the low noise amplifier is located at the front end of the radio frequency receiving system. Its main function is to The weak signal from the antenna is amplified. According to the noise cascading formula, the nois...

AI Technical Summary

Problems solved by technology

When the system works at low temperature, the noise of the low-temperature low-noise amplifier is reduced, but due to the large insertion loss of the coaxial connector at the input end and the semi-steel coaxial cable, from the system level, although the noise of the amplifier is reduced, but due to The insertion loss of the coaxial connector and the semi-steel coaxial cable is the same order of magnitude as the noise level of the amplifier itself or even greater than the noise level of the amplifier itself, so the obtained system noise is not significantly reduced, and because a vacuum chamber with a certain structure must be equipped The body, the compressor of the refrigerator, and the supporting heat dissipation structure are relatively large in size. The weight and volume of such a low-temperature system are relatively unsatisfactory, which has caused certain difficulties in application.

Images