A miniaturized high-gain, high-efficiency metamaterial assited S-band extended interaction klystron

We proposed a miniaturized S-band extended interaction klystron (EIK) assisted by metamaterial. The interaction structure of the EIK consists of a cylindrical resonant cavity filled with a metamaterial (complementary electric split-ring resonator) array. The study based on CST Eigenmode Solver predicted that the transverse cavity dimension of the proposed metamaterial assisted EIK is 1/3-1/2 times smaller than that of its conventional counterparts, while the device delivers typically 122 kW power, 53.5 dB gain and 43.5% electronic efficiency with an input drive of 0.27 W for typical beam and magnetic field parameters. The proposed metamaterial assisted EIK has potential applications in radar, industrial heating, accelerator, and satellite communications.