Advantages of the Extended Interaction klystron Technology at Millimeter and Sub-Millimeter Frequencies

The extended interaction klystron is one of the few readily available devices, capable of providing the required performance. This presentation describes the extended interaction klystron technology and presents improvements and design modifications in order to enhance power capability, bandwidth and to extend the operating frequency to the sub-millimeter region. A ladder-type RF circuit supports high efficiency and thermal stability at millimeter and sub-millimeter frequencies, while operating with moderate electron beam voltages. These EIKs operate at frequencies from 25 GHz to 280 GHz in continuous or pulsed modes.