Development of High-Performance, Long-Life and High-Reliability Microwave Amplifier for Satellite Application

Abstract

As the key electronic device of a new generation of long-life and high-reliable satellite payload system, a satellite-borne S-band microwave amplifier was designed in this paper. By resolving key techniques of the high-reliability architecture design technique, the protecting circuit design technique of large dynamic input overload protection, power supply and radio frequency channel safety, the microwave circuit design of anti-self-excited oscillation and anti-cavity-effect, electro-magnetic compatibility and other stability design techniques, high-efficiency heat dissipation technique. A microwave amplifier with test results of gain fluctuation ≤0.081dB, Voltage Standing Wave Ra-tio(VSWR)≤1.27, and amplitude consistency between channel ≤ ± 0.075dB was obtained, which can still work normally under 20dB excitation overload, 90~110V voltage bias, and 3:1 VSWR. The power supply unit has the functions of input overcurrent protection, output overcurrent protection, output overvoltage protection and so on. The reliability degree at the end of 12 years is better than 0.998. According to test results, the amplifier achieved high performance, long life and high reliability. During original stage and flight model stage, no significant quality and technical problems were detected. The performance of the amplifier is normal and stable on orbit.