A Circular-Head Short-End Stub DGS Loaded Coplanar Tri-Band-Pass Microstrip Filter

Abstract

A tri-bandpass microstrip filter is designed using inductive coupling technique to overcome the unwanted loss generated by the coupling gap between coplanar transmission line and coplanar ground plane. A circular head short-end stub DGS is integrated with coplanar waveguide which improves filter characteristics. Integration of DGS offered additional band-pass and compactness without degrading original filter performance. The experimental results of the proposed filter are found in good agreement with simulated results.