Design And Realization Of Miniaturized High-efficiency Radial Waveguide Power Combiner

The current microwave communication system is developing in the direction of miniaturization,high frequency band,and high power.In this case,a single power amplifier chip has become difficult to meet the needs of the system.Power synthesis technology is currently the most effective method,but Traditional power combiners are relatively large in size and low in efficiency,so,miniaturized,high-efficiency power combiners are currently an important research topic.This thesis uses chip micro-assembly technology,combined with low insertion loss radial waveguide power synthesis technology,performs multi-channel amplifier synthesis in the waveguide cavity,and overcomes the loss of traditional binary waveguide cascade power synthesis technology during multi-channel power synthesis.The big shortcomings have greatly improved the output power,with the combined efficiency exceeding 80%,while reducing the size and improving the practicability and reliability of the power combiner.The main work of this paper is as follows:1.Based on the theoretical analysis of radial waveguide,waveguide coaxial conversion and waveguide microstrip conversion,the synthesis network of Ku-band radial waveguide power combiner has been studied in detail.The research results show that it is in the frequency range of 14.3～15.5GHz,The insertion loss of the entire passive synthesis network is less than 0.8dB,and the synthesis efficiency exceeds 80%.The research results verify the feasibility of the design idea.2.Using high-performance gallium nitride bare chip and micro-assembly technology,a single-channel microwave amplifier module is designed.The length,width and height of the module are 5.5*4.7*0.9cm,and the output power of the module exceeds 20W.The output power of each module The amplitude difference is less than 0.5dB,which meets the design requirements of this subject.3.Based on the radial waveguide power combining network and the miniaturized microwave amplifier module,an eight-path waveguide power combiner is designed.The test results show that the combined power reaches more than 120W in the 14.3～15.5GHz frequency band,and the combined efficiency exceeds 80%.And the synthesizer has scalability,and can further design higher-power synthesizers.This thesis starts with theoretical analysis,simulation,technology and other aspects,and carries out detailed design and research on miniaturized high-efficiency power synthesizers,which provides a certain reference for the development and application of power synthesizers.