Analysis of Coupled Microstrip Lines with DGS UWB Printed Filter

This paper will present a microstrip bandpass filter design with controllable cutoff frequencies. The proposed design of filter is simulated, fabricated, measured and analyzed for UWB system application. The expected of filtering range is about 3.1 GHz to 10.6 GHz. This filter also expected to produce low insertion loss. A bandpass filter, based on microstrip structure provides the advantage of easy design, lower fabrication cost and compact size and has been widely used. This filter is simulated by HFSS and result show reasonable performances over entire UWB and the averaged insertion loss for UWB of this filter is about 0.2 dB with constant group delay.