Four-channel band-pass filter of comb-type artificial surface plasmon polaritons

The invention provides a comb-type artificial surface plasmon polariton four-channel band-pass filter which is in a traditional microstrip form and is produced and processed on the upper side and the lower side of a microwave dielectric substrate. A coplanar waveguide formed by a special fan-shaped structure and a traditional microstrip line is used as an input/output end of the filter to form a defected ground structure (DGS), so that large-area grounding of the bottom surface is avoided; the trapezoidal comb-shaped SSPP structure with the gradually-changed size is used for completing transition from the coplanar waveguide to the artificial surface plasmon polaritons; a T-shaped dual-mode resonator is loaded on a cascaded comb-type SSPP transmission line, so that a four-channel band-pass filtering effect is realized. In the aspect of performance, space radiation loss is low, insertion loss is small, out-of-band rejection is high, the matrix coefficient is good, and the bandwidth utilization rate is high. In