A UWB bandpass filter based on elliptical open stub-loaded resonator and dumbbell-sided cross-circle DGS

Abstract

An Ultra-wideband (UWB) bandpass filter (BPF) based on an elliptical open stub-loaded resonator (EOSLR) and dumbbell-sided cross-circle (DSCC) defected ground structure (DGS) is proposed in this paper. The measured results show that the 3dB bandwidth of the filter is 3.49∼11.04GHz, the skirt factor (S.F) is 0.844, the upper stopband rejection is greater than 20dB at 11.70∼26.80GHz, and the stopband width is 15.1GHz. The proposed filter has the advantages of high selectivity and extremely broad upper stopband and it can be applied in UWB Wireless communication system.