Input Circuit for a Wideband IOT

Emission gated microwave amplifiers, such as the inductive output tube (IOT), use density modulation to establish an AC current on the electron beam directly at the cathode surface. These amplifiers are compact and highly efficient, even in the linear regime. L-3 Electron Devices Division is developing a wide instantaneous bandwidth IOT (WBIOT) which will provide output power levels suitable for UHF radar applications with a 1 dB bandwidth in excess of ten percent. In this paper we describe the input circuit of the WBIOT.