Study of the Overlapping Mode in Coupled Extended Interaction Cavity

To extend the bandwidth of extended interaction klystron(EIK) in millimeter-wave band, an overlapping mode coupled extended interaction cavity is designed by adding a coupling slots between cavities. This paper presents the mode analysis of a coupled extended interaction cavity operating in overlapping mode. The electric field distributions, characteristic impedance, coupling coefficients and S11 parameters of the cavity are calculated by CST-MWS. The results show that the bandwidth can reach around 1.5 GHz.