A CPW-based Band-Elimination Filter Using a Patch of Conductor

Abstract

A new band elimination filter for coplanar waveguide using a patch of conductor is proposed. The proposed structure is composed of a coplanar waveguide (CPW) to which a patch of conductor on the opposite surface of the substrate is wired through a narrow hole drilled in the substrate. It is shown through numerical simulations by means of the FD-TD method that the structure provides excellent bandstop characteristics and that frequencies of stopband can be controlled by dimensions of the patch. We also investigate, both numerically and experimentally, the characteristics of a filter with several patches aligned periodically.