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

Compared with traveling wave tube power amplifiers,solid-state power synthesis amplifiers have superior performance that makes them more widely used in contemporary electronic communication systems.Today,the development of this technology is relatively mature,and it is developing in the direction of larger output power,wider operating frequency band and smaller size.The content of this thesis is to explore the wide-band,high-power solid-state power combining technology,specifically the following content:The theory on the main technical indicess of the active and passive parts of the power combining system are introduced respectively,The main broadband matching structure is analyzed.A 3dB power dividing circuit with a microstrip line of ceramic dielectric at an operating frequency from 2 to18 GHz is designed.Each output branch of the structure is matched with 7 quarter-wavelength matchers.The isolation resistance is the square resistance.The simulation results show that each port of the structure is impedance matched to the other two ports and the isolation of the two output ports is more than 20 dB,and the insertion loss is less than 0.7dB.An 8-way power dividing circuit using suspended microstrip lines and microstrip lines at an operating frequency from 2 to 8 GHz is designed.The first two levels of the structure use suspended microstrip lines,and the third level uses microstrip lines.After processing and testing,the return loss of this structure in the frequency band of 2-8GHz is more than 11 dB,and the insertion loss is less than 1dB.The transmission characteristics and power capacity of the air strip line are analyzed,and the 2-way and 4-way power dividing circuit using the air strip line at an operating frequency from 2 to 8 GHz are designed.They were processed and tested,and the test result is good.A power dividing circuit with a working frequency from 2 to 8GHz and a output of 150 W under continuous wave working condition was developed by using 12-channel suspended microstrip line power dividing circuit and 12-channel air stripline combining circuit.After testing and analysis,the output power of the power amplifier is more than 150 W at high temperature,low temperature and normal temperature,and the overall efficiency is about 20%.Broadband power dividings using extended coaxial structure and transition structure based on slot line and microstrip line were explored.In this paper,an 8-way extended coaxial power dividing at an operating frequency from 2 to 18 GHz is designed and processed.The structure of some defective grounds can also achieve broadband characteristics.In this paper,a broadband power dividing is designed using the transition structure based on slot line to the microstrip line.The power dividing has a return loss higher than 15 dB from 2.8 to 7.8GHz,Successfully verified its feasibility.Based on this structure,this paper has designed 4-way and 8-way power division structure.The simulation results show that the 4-way and 8-way power division structures based on the transition structure based on slot line and the microstrip line both exhibit good characteristics.