Tunable band stop filters based on Metal-Insulator Transition in vanadium dioxide thin films

Abstract

We present the design, simulation and fabrication of innovative tunable band stop filters realized using switching devices based on the fast, reversible Metal-Insulator Transition of vanadium dioxide thin films. The filters are designed to operate in the 11–13 GHz frequency range and consists in a transmission line coupled with four U-shaped resonators. We developed two types of tunable filters based on VO2 switches integration namely a “switchable stop band filter” for which the rejection band can be switched on and off and a “discrete tunable stop-band filter” for which the width and position of the stopband can be discretely tuned.