某星载S频段线性化行波管放大器输出功率下降问题研究OA

The spaceborne traveling wave tube amplifier is a key unit of the satellite payload subsystem,and its performance stability directly affects the reliability and service life of the satellite communication link.This paper conducts a comprehensive fault diagnosis and mechanism study on the abnormal phenomenon that the output power of one S-band TWTA dropped by approximately 4 dB during the transponder performance test of a certain satellite in the whole satellite state.Based on fault tree analysis and various ground troubleshooting tests,it was determined that this malfunction was caused by hydrogen poisoning of two low-noise amplifier chips inside microwave modules located in the linearized channel amplifier.After implementing corrective measures to replace the faulty modules with another batch of the same model and specification products with qualified hydrogen content and conducting experimental verification,the S-band TWTA returns to normal operation,which provides suggestions for the design improvement and component selection of subsequent satellite design.This research has significant engineering reference value for ensuring the long-term stable operation of spaceborne TWTA in orbit and enhancing the reliability of satellites.