Research On Multi-channel Gysel Power Distribution/combiner

The rapid development of wireless communication technology has put forward higher requirements for modern microwave circuit systems.The power divider(PD)is a three-port or multi-port passive device which is able to split an input signal into two or more and identical(i.e.in-phase)signals.It can also be used as a power combiner,where the common port is the output and the two or more power ports are used as the inputs.Power dividers/combiners are essential circuits of mixers,power amplifiers,and feeding networks of antennas.Especially for solid state power amplifiers(SSPAs),the power dividers/combiners with smaller size can be used to combine multi-path signals to achieve high-power output,and have thus received extensive attention.Based on the theory of transmission line,microwave network and power divider,this thesis is focused on in-depth theoretical research on high power,high isolation N-way Gysel power dividers/combiners with arbitrary power division ratio and arbitrary terminal loads.The main work is given as follows:1.An N-way radial Gysel power divider is proposed based on the traditional two-way Gysel power divider.By applying voltage and current node method,the complete design equations for three-way/four-way radial Gysel power divider with arbitrary power dividing ratio and arbitrary terminal load are derived for the first time.2.Four radial Gysel power dividers with different numbers of outputs and different power dividing ratios are designed by using the design formulas of three-way and four-way unequal Gysel power dividers,based on single-layer and double-layer structures.The simulation results confirm the accuracy of the design formulas.3.A full-parameter circuit analysis of the N-way Gysel power divider with joint point is carried out by using voltage and current node method.The design equations of N-way original Gysel power divider with arbitrary power ratio and arbitrary terminal load is obtained for the first time.4.Four different Gysel power dividers with joint point,which have different numbers of outputs and different power dividing ratios are designed and fabricated based on the microstrip-line double-layer circuit structure by using the design equations of original N-way Gysel power divider.The design equations are verified by good agreements between simulation results and measured results.This thesis lays emphasis on the theoretical analysis of two types of N-way Gysel power dividers and design equations are obtained for the first time.On this basis,eight Gysel power dividers with different numbers of outputs and different power dividing ratios are designed,simulated,and measured.The design equations are verified by the simulation results and measured results,which can provide potential technical guidance for the relating designs.