Cold-circuit Simulation of a Thin-wire Metamaterial- inspired Backward Wave Interaction Structure

摘要

A thin wire (TW) metamaterial (MTM) based interaction structure has been proposed for the realization of a backward wave oscillator. The interaction structure is made of interconnected arrays of TW s of square cross-section arranged periodically along the axis of a rectangular waveguide. A fundamental backward mode has been observed in the frequency range 12.35-13.28 GHz. It has also been observed that the mode exhibits a strong axial electric field necessary for the beam-wave interaction with the on-axis interaction impedance of $pmb{362 Omega}$ at the chosen operating frequency of 12.7 GHz.