Study on equivalent circuit of wideband BPF using groundplane windowed SRR and its realization

Abstract

This paper deals with the study on equivalent circuit of wideband bandpass filter (BPF) constructed using groundplane windowed split ring resonator (SRR). The study also covers realization and characterization of wideband BPF as well as its result comparison. The proposed wideband BPF is composed of 3 cascaded groundplane windowed SRR connected with microstrip lines. The equivalent circuit comprises of lumped elements of inductor and capacitor based on its geometrical structure and is performed using EM & Circuit simulator. Meanwhile, the realization is carried out using a 0.8mm thick FR4 Epoxy dielectric substrate with the dimension of 60mm × 20mm. The characterization result shows that the realized wideband BPF has the −3dB bandwidth response of 0.81GHz in the frequency range of 1.75GHz-2.56GHz which is comparable with the simulated result of equivalent circuit.