大功率高效率星载固态功率放大器研究

High power high efficiency solid state power amplifier used in space

针对卫星系统对于微波大功率放大器的需求,研制了L频段200 W高效率固态功率放大器,对其设计方法和关键技术进行了详细论述。应用低温共烧多层陶瓷技术,实现了射频电路的高集成和小型化;基于第三代半导体器件,应用波形赋形及线性补偿技术,提升了射频电路的功率和效率;采用移相全桥拓扑,研制了高效率、大功率二次电源。在1.45~1.55 GHz的频带范围内,固放整机输出功率大于200 W,效率高于60%,3阶交调优于18 dBc,同时具备30 dB增益可调,360°内步进5.6°的相位可调能力。试验结果表明,该固放为目前国内星载领域连续波功率和效率最高的单机。

In response to the demands for microwave high power amplifier in satellite systems,an L-band 200W highefficiency solid-state amplifier(SSPA)was developed and its design methods and key technologies were discussed.a highly integrated and miniaturized radio frequency unit(RFU)was realized with SSPA by using LTCC(low temperature co-fired ceramic)substrate.Based on the third-generation semiconductor devices,the power and efficiency of the RFU were improved by applying waveform shaping and linear compensation techniques.A high efficiency and high power secondary power supply was developed by using phase-shift-full-bridge(PSFB)topology.From 1.45GHz to 1.55GHz,the SSPA delivers more than 200W of output power with an associated 3rd order intermodulation product(IM3)and power added efficiency(PAE)better than 18dBc and 60%respectively.The gain can be adjusted within 30dB,whereas the phase can be adjusted within 360°range with a minimal step of 5.6°.The experimental results show that the SSPA is the most advanced with the highest power and efficiency in China.