基于波导合成高效高功率密度Ku波段功放

摘要

Based on BB180 waveguide power combiners and double-channel micro-strip probe transition, a compact high efficiency power-combing system is presented in this paper.High efficiency is realized by using waveguide-combiner,and utilizing double-channel microstrip probe transition structure,the power mini-modules are stacked,so high power density output is realized in Ku band.Firstly,by analyzing the model of waveguide combiner and double-channel micro-strip probe transition using HFSS software,the simulation result is provided.In engineering design,peak-power output of the mini-module constructed by GaN MMIC is 25W.The HPA module combines 8 modules to produce up to 180W output in Ku-band(19%duty cycle).The total passive combing efficiency is up to 85%,PAE is over 25%,and the power density is 0.135 W/cm3 .So a high efficiency and high power density RF output amplifier is realized in Ku-band.%提出了一种基于BB180波导电桥合成器与波导微带双探针相结合的Ku波段高效空间合成方案，波导合成实现了高效率，波导微带双探针结构实现功率模块的叠层安装，在 Ku波段通过二者的结合实现了高功率密度。首先利用 H FSS软件分析波导合成器和波导微带双探针模型，给出了仿真结果。在工程设计中采用 GaN功率芯片构成放大器小模块单元，输出峰值功率25 W。功放采用8个模块单元合成，在Ku波段合成饱和输出180 W峰值功率（19％占空比），合成效率超过85％，附加效率高于25％，功率密度达到0．135 W/cm3，实现了Ku波段微波高效合成与高功率密度输出。