Research On The Technology Of Microwave Broadband Solid-state Power Combiner

With the rapid development of communication system,the requirements for broadband,high power and other indicators of the system are becoming higher and higher.Therefore,it promotes the development of Microwave Monolithic Integrated Circuit.However,MMIC is limited by semiconductor technology and it is difficult to meet the high outpower requirement of the system.Therefore,microwave solid-state power combining technology is an important research area.In the whole power combiner system,power divider/combiner network plays an important role,its low loss and good properties of amplitude and phase can improve the combining efficiency of the whole power combiner system.In this paper,microwave broadband solid-state power combining technology is taken as the research direction,focuses on multi-way broadband power divider/combiner based on coaxial waveguide and suspended microstrip line.The first chapter of this paper outlines the research background of microwave solid-state power combining technology and the development status.The second chapter introduces the basic theory of power combiner and analyzes the key factors which affect the efficiency of combiner The third chapter introduces the design method of the power divider/combiner of the coaxial waveguide.This power divider/combiner can directly perform N-way distribution/synthesis,which can effectively reduce the size of the device.Based on this,6-way,9-way,12-way,15-way power dividers operating from 2GHz to 8GHz are designed.According to the simulation result,it can be seen that their return loss is greater than 15 dB,while the insertion loss will rise with the increase of the number of ways;Another 6GHz-18 GHz power divier is designed.The measurement of 6-way power divider shows that the return loss is greater than 12 dB and the insertion loss is less than 1.5 dB.The fourth chapter introduces the basic characteristics of the suspended microstrip line,and designs a multi-way power divider network operating from 2GHz to 18 GHz.According to the measurement results,the return loss of the two-way power divider is greater than 10 dB,and the insertion loss is less than 1.8dB.The return loss of the 4-way power divider is greater than 10 dB,and the insertion loss is less than 1.5dB;the return loss of the input of the 8-way power divider is greater than 10 dB,and the insertion loss is less than 2.5dB.Subsequently,thetransition structure of the microstrip line to the suspended microstrip line is improved.The return loss of the new transition form is greater than 26 dB in 2-18 GHz,and the insertion loss is less than 0.03 dB.Based on this,the improved multi-way's power divider is designed.According to the simulation results,the return loss is greater than15 dB,the insertion loss is less than 0.3dB;In addition,the 8-way power divider/combiner operating from 6GHz to 18 GHz is designed.The simulation results show that the return loss of the input is greater than 17 dB,insertion loss less than 0.5dB,based on this design 6-18 GHz power combiner amplifier which outputs 47 dBm power is designed.