Abstract

Abstract — In this work, the design procedure, modelling and implementation of reconfigurable filters based on RF microelectromechanical systems metamaterials is presented. Specifically, tunable stop-band and pass-band frequency responses are obtained by combining RF-MEMS with metamaterials based in complementary split rings resonators. These particles, allow for the design of negative effective permittivity transmission lines, providing forbidden propagation frequency bands. Moreover, CSRRs properly combined with metal vias in transmission lines, generate a simultaneously ε < 0 and µ < 0 effective media which involves an allowed frequency band. These two phenomenons have been used in order to implement stop-band and pass-band filters. Since CSRRs present a LC-tank behaviour and are electrically coupled to the host line, the tunability is achieved by means of the RF-MEMS, which modify the electrical characteristics of the CSRRs and the electric coupling. A full electrical model for the description of the proposed structures is presented. The circuit model take into account the electrical characteristics of the RF-MEMS, CSRRs and transmission lines as well as the involved electromagnetic coupling and are used for accurate prediction of switchable filters response. 1.