Study of Side Coupled Modulation Cavity for High Power Microwave Application

Abstract

In this paper, we have studied the side coupled modulation cavity as an RF interaction structure of the reltron. In this modulation cavity beam wave interaction takes place. Using CST Eigenmode solver a beam absent simulation of the modulation cavity has been carried out. Since the side coupled modulation cavity is made of three re-entrant cavities, the modulation cavity provides three resonant modes i.e. 0 mode, ?/2 mode and ? mode. Here,  ?/2 mode  is  the  desired  mode of the operation and it is obtained at 2.896 GHz at 10mm coupling depth. One of the major advantages of the side coupled modulation activity is that it can be made the frequency tunable. To  predict this behavior we have varied the coupling depth of  the cavity and obtained the frequency for all the three resonating modes.