Rejection filters based on spoof surface plasmons and complementary metamaterial particles

We propose a rejection filter using metamaterial particles to etch the metal part of spoof surface plasmons (SPPs) waveguide which is made up of double-side corrugated metallic strip. The combination of spoof SPP transmission and H-shape structure a kind of capacitive wire media can consist of the LC resonant circuit. It is affirmative to achieve signal suppressions at their resonant frequency. Adjusting groove depth can not only change the cut-off frequency but also change the rejection band of the filter. The simulation results demonstrate the excellent filtering performance of all the designed filters, and the proposed filters can play an important role in the integrated plasmonic devices and circuit at microwave and terahertz frequencies.