Rectangular Waveguide BPF Using Split Ring Resonator Metamaterials

A bandpass filter (BPF) made of a rectangular waveguide with two artificial dielectric resonators inserted is investigated numerically and experimentally. The resonators which take rectangular shapes are placed in the center of waveguide excited using TE10 mode. Each resonator which is separated in a certain distance each other is divided into three sides with FR4 Epoxy dielectric substrate in the left and right sides, while in the middle it is composed of artificial dielectric materials realized using metamaterials based on split ring resonator (SRR). The characteristic response of BPF is investigated by changing the distance between resonators, the thickness of resonators, and the dimension of artificial dielectric materials. From the measurement result, it shows that the realized BPF has center frequency of 1.16GHz with S-11 and S-21 values of -25dB and -5.4dB, respectively. This is comparable with the simulation result which has same center frequency with S-11 value of -16.3dB and S-21 value of -8.9dB.