Compact Coplanar-waveguide Band-rejection DGS Resonators

Abstract

In this paper, compact coplanar-waveguide (CPW) defected-ground-structure (DGS) resonators are demonstrated, by placing floating patches. Two T-shaped slots as a bandstop resonator are etched in two ground planes of a CPW 50 Omega transmission line. Two rectangular patches are symmetrically placed on the bottom layer of the substrate. The patches modeled as an additional capacitance increase the effective capacitance of the resonator. By tuning the geometrical dimension of the patches, the resonance frequency is lowered.