A band-notched coplanar waveguide based on spoof surface plasmon polaritons

A simple band-notched coplanar waveguide (BNCPW) is presented in this paper, which is designed based on the idea that a defect mode in the bandgap between the fundamental and higher modes of the spoof surface plasmon polaritons (SSPPs) can be introduced to form a stopband. The BNCPW, a quite simple structure, consists of a coplanar waveguide (CPW) and a periodic corrugated metallic strips on the back of the dielectric substrate. By properly tuning the geometrical parameters of the strips, we can introduce a very narrow stopband at will in the working band of the CPW. In this framework, a variety of band-notched devices and antenna can be easily designed without additional band-stop filters.