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Abstract:
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In this work, the design procedure, modelling and implementation of recon¯gurable
¯lters based on RF microelectromechanical systems metamaterials is presented. Speci¯cally,
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 e®ective permittivity transmission lines, providing forbidden propagation
frequency bands. Moreover, CSRRs properly combined with metal vias in transmission lines,
generate a simultaneously " < 0 and ¹ < 0 e®ective media which involves an allowed frequency
band. These two phenomenons have been used in order to implement stop-band and pass-band
¯lters. 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 ¯lters response. |
