A high efficiency, G-band, 350 kW pulsed, traveling wave tube

The efficiency and gain of a power output tube are important parameters in determining the overall size and power consumption of a radar transmitter chain. Hitherto, high efficiency has only been obtained in travelling wave tubes at relatively low power levels and limited gain. This paper describes the application of efficiency enhancement techniques to higher power levels with the achievement of 50% efficiency in a 350 kW, G-band, pulsed travelling wave tube having 30 dB minimum gain. The tube uses a cloverleaf circuit with a single sever, a velocity tapered output section and a two stage depressed collector.