Preliminary Design of Reentrant Square Cavity for EIK Application

A slow-wave structure (SWS) with periodic coupling structure and reentrant cavity is proposed for extending the extended interaction klystron (EIK) technology. The conventional higher-order mode single-period cavities allow for larger sizes, corresponding to the G-band (220 GHz), but their low R/Q values are not facilitating the realization of extended interaction klystron (EIK). The newly proposed compact EIK topology is to support millimeter-wave higher-order mode operations. The slow wave structure facilitates the advantages of multi-layered processing.