Broadband surface Plasmon radiator

The invention discloses a broadband surface Plasmon radiator. The broadband surface Plasmon radiator operates at the microwave frequency band and uses dual-surface antipodal metallic structure, namely dielectric upper-level metal and lower-level metal use same structure and are arranged oppositely. The broadband surface Plasmon radiator performs feed through a conventional microstrip transmission line, achieves radiation of surface Plasmon by using a single-side fold belt line with a gradually-changed groove depth and an opening metallic structure, and solves a problem that a radiator in the prior art is large in overall size and cannot be miniaturized. The broadband surface Plasmon radiator may achieve direct and high-efficient radiating surface Plasmon within a broadband range.