Synthetic Efficiency Of Millimeter-wave Power Combiner Components And Systems

This thesis mainly expresses the design,research and analysis for millimeter-wave power combiner components and for the combining efficiency of power combiner system.Above all ,we introduce the development of millimeter-wave power combiner and the novel study production at home and abroad .Taking circuit form into consideration in the design of millimeter-wave power combiner, the gauge of high reliability and high performance must be defined.we design two kinds of waveguide-to-microstrip transition ,the first kind of transition based on the achievement of a matched impedance probe show excellent performance,the second transition can also have good performance on some conditions through numerical simulation.The theory of Wilkinson power combiner and ratrace coupler is analyzed by using the odd-even mode method in this thesis.On the basis of the theoretical analysis,we designed and tested the Wilkinson power divider ,the modified Wilkinson power divider and ratrace coupler ,good agreement is observed .In addition we propose a power combiner based on a waveguide-to-microstrip transition using antipodal finlines .This structure united the two functions of transition and equal power division ,it can not only be used in the circuit power combiner but also be used in spatial power combiner .The main design goals of a power amplifier are focused on output power and efficiency. The haronics at the output is terminated especially to the second harmonic,in order to improve the output power and efficiency.We present a new method for harmonic tuning by using photonic bandgap (PBG structure at the output of the power combiner in this thesis.Finally ,we discussed combining efficiency and the failures in the power combiner.