Ka-band Total Power Radiometer Direct Put Receiving Module Design

In view of the problem that there exist converse radiation and multi-channel interference in traditional superheterodyne millimeter-wave (MMW) radiometer when imaging at short range, it is necessary to expand research on Ka-band total-power direct amplification receiver module. The main contents are presented as follows:(1) Based on the analysis of composition, basic principle and sensitivity of Ka-band total-power direct amplification radiometer, combing with the actual requirements, the realistic design scheme is put forward.(2) As to the radiometric sensitivity in total-power radiometer, the effects of bandwidth, integration time, and receiver noise figure are analyzed. Then, both a low noise high gain broadband MMW amplifier and low noise broadband MMW detector are designed. In addition, the simulation and optimization of three waveguide to microstrip structures are conducted in HFSS. And at the same time, the optimization of input VSWR in detector and bias circuit of the low noise amplifier are simulated in ADS.(3) According to the specifications of the total-power radiometer, the fabrication and test are carried out in laboratory, and some results are presented and analyzed.The practicability of the design described in this thesis is validated by actual tests, and it provides important reference to area of radiometric detection.