Design Of Ultra Wideband Radial Space Power Combiner

So far communication technology and wide application of power devices have achieved such prominent development that requirements of ultra-wideband and high-power applications have surpassed the standard which the best traditional single-chip power devices represent.As entire industry progresses incessantly,power synthesis technology has gradually proven to be dependable in terms of high-power technology.This paper first introduces the research status of space power synthesis at home and abroad and the classification of common synthesis technology,analyzes the advantages of space synthesis from the theoretical level,and introduces the basic design principle of power synthesizer.Secondly,the theory and design scheme of WRD650 standard double ridge waveguide power synthesizer are analyzed.The power synthesizer is divided into the following three parts for design:the mode conversion structure from TEM mode to double ridge waveguide mode,namely the input part structure;Double ridge waveguide mode transition to radial waveguide TEM mode conversion structure,namely synthesis part structure;And the coaxial waveguide output radial waveguide power structure,namely the output part structure.In addition,a power combiner is designed by using double ridge waveguide.When the input port is double ridge waveguide,the simulation results of the power combiner show that in the frequency band of 6.5?18GHz,S₁₁ is better than-15.4 d B,and the insertion loss is less than-9.3d B.In the frequency band of7?18.5GHz,S₁₁ is better than-20d B,and the insertion loss is less than-9.2d B.Finally,the theory and design method of coaxial-to-double-ridge waveguide adapter are introduced,and two different coaxial-to-double-ridge waveguide converters are designed.Finally,the overall test analysis is carried out.The test results show that the first type of N-type to WRD650 standard double ridge waveguide direct insertion high-power converter,HFSS simulation results show that the VSWR is less than 1.25,and the S₁₁ measured is better than-10d B;Another side-fed SMA joint to the WRD650 standard double ridge waveguide general power converter,the simulation VSWR is less than 1.4,S₁₁ measured better than-13d B.Using the above first transfer structure,the overall simulation test of this power synthesizer is carried out on HFSS.The HFSS results show that S₁₁ is better than-17d B in 6?18GHz,and the branch is better than-9.5d B.The measured results show that the power combiner meets the requirement that the synthesis port is less than-10d B,and the synthesis efficiency in the frequency band is greater than 75%.The main research results of this paper are as follows:1.The basic theory of designing power combiner and the calculation method of characteristic parameters of ridge waveguide are deduced;2.Using the WRD650 standard double ridge waveguide,a new radial space power combiner is designed by using the method of gradually changing the upper ridge and lengthening the lower ridge.3.Two conversion joints are designed.Finally,the conversion joint is cascaded with the dual-ridge waveguide power combiner for simulation test.