Spoof Surface Plasmon Polariton Based Ultra-Wideband Bandpass Filters

This paper presents Spoof Surface Plasmon Po-lariton (SSPP) based eight different designs of bandpass filters with various geometric parameters and structural configurations. Optimal performance is achieved with a groove height mismatch of 1 mm, resulting in an ultra-wide transmission band of 37.5-174 GHz with a bandwidth of 136.5 GHz and significantly low signal reflection of below -10 dB. Moreover, the impact of change in the geometric entities of the SSPP interconnect on the transmission characteristics has also been explored. Through Finite Element Modeling (FEM) simulations, we further investigated how the curvature, bending, and structural mismatches of the SSPP connector affect the bandwidth of these filters.