Study of a Ka-Band High-Power All-Metal Metamaterial Microwave Generator

A new high-power microwave-generator based on metamaterial (MTM) slow wave structure is studied. The microwave structure is formed by inserting a MTM plates loaded with 2D split ring resonators (SRRs) into a rectangular waveguide. The dispersion characteristics of the unit cell are obtained by using eigenmode simulations in the High Frequency Structure Simulator (HFSS). In addition, the transmission properties and the beam-wave interaction characteristics are simulated in the Computer Simulation Technology (CST). The simulation results indicate that the novel metallic MTM backward wave oscillator (BWO) can produce 20.05 MW output peak power and an interaction efficiency of 45.56% at the frequency of 33.157 GHz.