8 Mm Band Radial Waveguide Power Synthesis Technology Research

The application research for power combing amplification on8mm wave band was based on the theory of power combing amplification and the actual needs of the project in this thesis. Eight-path radial waveguide power combing amplifier on8mm wave band was designed on the base of non-resonant N road power combing method by comparing and analyzing the relevant application at home and abroad. The main contents in this thesis are as follows:(1) A power distribution/combining network based on the radial waveguide-rectangular waveguide-microstrip probe transition was adopted in this thesis by analyzing and comparing the characteristics of various power combining structures.(2) All modules of the power combing amplifier in this thesis were systematic designed and the simulation software Ansoft HFSS was used to simulate and optimize them. Rectangular waveguide-coaxial conversion structure used coaxial probe form, in the frequency range32.8～36.4GHz, the return loss<-30dB, the insertion loss<0.05dB.The millimeter signal coming from coaxial probe get through the radial waveguide and rectangular waveguide mix structure to divide into eight-path signal. The result for the radial wave power distribution/combine device was that:in the frequency range33.2～36.9GHz, the return loss<-20dB.at the edge of the eight-path waveguide, we used the rectangular-microstrip probe structure, in the30-40GHz, the return loss<-25dB, the insertion loss<0.049dB, the VSWR<1.14; in the frequency range32-37GHz, the insertion loss<0.033dB, the VSWR<1.04. Two90°rectangular waveguide were used for input and output to make sure the same transition direction of the signal. The low loss of power structures base on the power distribution/combine network gave full play to the advantages of the non-resonant type N road power combine methods.(3) DC power supply scheme and the assembly problem for the MMIC chip HMC283were designed. The cavity of the power combining amplifier and test scheme for the device were also discussed.By researching and optimizing the structure of the amplifier, the simulation result showed that:in the frequency range33～35.7GHz, the return loss<-20dB, and the VSWR<1.25.The data could meet the needs of the project and the result showed the scheme is feasible.