L-band 300-Watt solid state pulse power amplifiers for SAR

To meet the special requirement of SAR, a solid state power amplifier, with an integral heat-sink requiring forced air cooling, has been developed. The amplifier delivers 300 Watts of pulsed power output into 1.5:1 load VSWR with 36 dB minimum gain at 28 volt, and provides about eight percent bandwidth (1 dB) while maintaining an efficiency of approximately thirty percent. High reliability, simplicity and model repeatability are featured in this amplifier design. It has an integrated and compact structure. This paper describes the design and development of the amplifier and presents some of important performance data, including some test data.