基于波导合成高效高集成度 Ku 波段发射机

摘要

提出了一种基于 BB180波导 HT 合成与双 BB180波导转 BJ180ET 合成相结合的 Ku 波段高效波导合成方案。波导合成实现了高效率,BB180波导形式实现合成结构轻小型化。首先利用 HFSS 软件分析两种波导合成器三维模型,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。170 W 功放采用8个模块单元合成。发射机采用4个170 W 发射功放波导合成,在 Ku 波段输出功率600 W(占空比19%),总合成效率在80%,附加效率达到18%。在结构设计上,170 W功放、电源模块、波导合成器采用叠层结构组装,大大减小了发射机空间,实现了发射机高集成度。合理的结构及热设计保证了发射机高功率工作的可靠性。%Based on BB180 waveguide HT power combiner and double-BB180-waveguide to BJ180 ET power combiner,a compact high efficiency power-combining system is presented.High efficiency is realized by using waveguide-combiner,and the small-sized combiner is realized by utilizing BB180 waveguide struc-ture.Firstly,by analyzing two models of waveguide combiners using HFSS software,the simulation result is provided.In project design,peak-power output of the mini-module unit constructed by GaN MMIC is 25W. The HPA module combined 8 units produces up to 1 70W.Combined 4 1 70W-HPA-modules using waveguide combiner,the transmitter produces 600W(1 9% duty cycle)output in Ku-band.The total passive combining efficiency is measured up to 80%,and PAE is over 18%.In structure design,1 70W-HPA-module,power supply module and waveguide combiners are assembled in superposition structure.So small-space and high integration is realized.Reasonable structure and thermal design ensure the reliability of the transmitter.