Complementary split ring resonators with dual mesh-shaped couplings and defected ground structures for wide pass-band and stop-band BPF design

Abstract

Novel configurations of complementary split ring resonator (CSRR) with dual mesh-shaped couplings and defected ground structures (DGS) are introduced to design the high performance of wide pass-band and stop-band band pass filters (BPF). This paper presents a low insertion loss (-0.82dB), symmetry and sharper transmission zero level (-51.88dB), using effective DGS and alternative coupling for CSRR. The filter with center frequency at 1.92 GHz, pass-band from 1.21GHz to 3.05GHz (BW = 95.8%) and wider stop-band (extended to 4.2f0 below -20dB rejection level) is designed and fabricated. Simulation and measured results including surface current distributions and frequency responses are presented and discussed.