A Dual Plane Comb-Line Filter Consisting of Conductor-Backed Coplanar Waveguide

Abstract

A dual plane comb-line filter consisting of conductor-backed CPW is proposed in this paper. It is shown through numerical simulations by means of the FD-TD method that this filter has an attenuation pole just below the pass band in contrast to conventional uniplane-based-CPW comb-line filters having an attenuation pole on the other side of the pass band. We also investigate the filtering characteristics from both numerical simulations and experiments when the resonators are formed in the step-impedance structure. The validity of FD-TD simulations has been comfirmed through a careful comparison between the numerical results and measurements.