Research On Synthesis Technology Of Solid State Broadband Power Amplifier

With the continuous development of microwave and millimeter wave technology,the demand for microwave and millimeter wave amplifiers is increasing in radar,electronic countermeasure,communication,electromagnetic compatibility testing and other fields.In order to solve the problem that the design of microwave and millimeter wave synthesis is very difficult in the wide-band field and the index is deteriorated,this paper proposes a research method based on the comparison of various synthesis schemes of microstrip and stripline structures.The advantages and disadvantages of various broadband synthesis schemes are obtained,and the suitable synthesis schemes under different working environments are summarized and the optimization direction is proposed.Firstly,the index of synthesizer is studied,and the factors that affect the key index and the causes of these factors are analyzed.On this basis,the research and analysis of broadband synthesis scheme are carried out,mainly aiming at Wilkinson and 3dB bridge synthesis scheme for modeling and simulation.After that,the simulation results are compared and analyzed to find out the advantages and disadvantages of the two structures and propose the suitable environment for different synthesis schemes.The Wilkinson two-way synthesizer with 6-18 ghz gradient line and the 0.8-6GHz multi section symmetrical interleaved coupler are selected for physical processing,and the design of active test link and timing protection power board are carried out.Then the synthesizer is assembled and tested.Compare passive test results with simulation results.This paper mainly analyzes the reason why the insertion loss of 0.8-6GHz multi section symmetrical interleaved coupler is larger than that of the simulation,and puts forward the improvement and optimization scheme according to the analysis results.Then the active test is carried out,and the test results are compared with the passive test results.Based on the analysis of the self excitation phenomenon of the Wilkinson two-way synthesizer with 6-18 ghz gradual line in the process of active test,an optimization solution is proposed.At the same time,according to the problem of insufficient heat dissipation in the test process,the improvement ideas are given.The simulation and test results show that the synthesis method of bandline multi section symmetrical staggered coupling 3dB bridge structure is more suitable for the system with poor standing wave ratio,which can solve the problem of link self excitation caused by the difference of standing wave ratio.Later,LTCC technology can be used to solve the assembly error caused by the discrete bandline structure.