Utilization of CSRR and DGS on Wideband SIW Bandpass Filter

The development of wideband bandpass filter (BPF) is proposed based on substrate integrated waveguide (SI-W) technique which utilizes complimentary split ring resonator (CSRR) and defected ground structure (DGS). The proposed wideband SIW BPF that was designed and realized on an FR4 epoxy dielectric substrate implements CSRR structures on its SIW conductor surface and square DGS at the groundplane. Parametric study upon the characteristics of wideband SIW BPF without and with DGS is performed using simulation software to investigate the effect of its existence prior the hardware realization. The characterization results with the measured working bandwidth and fractional bandwidth of 8.36 GHz and 123.28%, respectively, show the good agreement each other with the simulated ones.