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In this paper, a compact rejection filter is proposed based on 2.5-D spoofsurface plasmon polariton (SSPP) structure and folded spilt-ring resonators(SRRs). By embedding the folded SRRs into periodic grooves of the 2.5-D SSPPtransmission line, a rejection band is created in the ultra-wide passband,resulting in pass-rejection-pass frequency characteristics. The rejection bandand the cut-off frequency of the filter can be adjusted independently bychanging the geometrical parameters of the 2.5-D SSPP rejection unit. Becauseof the compact folding structure, the lateral size is reduced by 54% comparedwith the conventional 2-D SSPP rejection filter.

A Compact Rejection Filter Based on 2.5-D Spoof Surface Plasmon Polaritons and Folded Spilt-Ring Resonators