Effect of Various CSRR Meta-resonator Geometries on the Bandwidth of C-band Waveguide Filters

Recently, split ring resonator (SRR) or complementary split ring resonator (CSRR) meta-resonator structures have been widely used in waveguide filter designs. These waveguide filters with meta-resonator have some advantages over conventional waveguide filters using iris and post as follows: easy to make the equivalent circuit model, a wide range of applications, miniaturization, and low cost. In this work, the bandwidth impact of three widely used CSRR meta-resonator structures with different geometries (ring, rectangular, and crescent shapes) is investigated at C-band. The analyses are performed numerically in CST Microwave Studio (MWS) and Rogers 5SS0 is used as a substrate. According to the results, the narrowest band design is the rectangular-shaped filter while the widest band design is the crescent-shaped filter.