A high gain 100 kw X-band traveling-wave amplifier

This paper describes an X-Band periodically focused traveling-wave tube which yields 100 kw peak power with less than 100 mw RF drive at an electronic efficiency of 22%. The average RF output power is in excess of 500 watts at over 50 kw peak across a 1050 Mc bandwidth. The output power variation for constant drive under saturation conditions is 1.2 db over a 1000 Mc bandwidth. Freedom from oscillations is achieved over a 30% voltage range by the use of multiple severs and perturbation techniques on higher order modes.