Localized-Spoof-Surface-Plasmons Bandpass Filters Based on Magnetic Coupling

In this paper, two bandpass filters based on localized spoof surface plasmons (LSSPs) are proposed. Magnetic coupling is selected as the scheme to connect the input and output ports with the LSSPs resonator. Simulation results show that the 3-dB bandwidth is 1.44 GHz (24.7%) from 5.10 GHz to 6.54 GHz, centered at 5.82 GHz. Compared with the counterparts coupled by microstrip lines, this work has the advantage of wide bandwidth. Compared with the conventional filters, this work has the advantages of lightness and compactness.