In this paper, we present a novel dual-bandpass filter based on the substrate-integrated waveguide (SIW) and spoof surface plasmon-polariton (SSPP) hybrid structure. In this design, periodic subwavelength H-shaped units are etched on the top SIW surface to support SSPP mode. The dispersion and transmission characteristics of the proposed SIW-SSPP filter are analyzed. The dual-bandpass feature is observed for resonant tunneling of the H-shaped elements, and the passbands can be controlled easily by adjusting the filter parameters. Simulated and measured results demonstrate excellent transmission performance of the proposed filter.
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