Scattering analysis of a width modulated coplanar waveguide metasurface

Analysis of the scattering from a novel type of metasurface consisting of unit cells incorporating a width modulated coplanar waveguide (CPW) line is presented. The width modulated center conductor is circumscribed by two modulated parallel conductors which can play the role of ground planes in case of insertion of active devices. The structure provides flexibility of changing modulation over both ground or center conductor; however the present study is limited to the modulation of center conductor only. Theoretical details and results of numerical analysis of the reflection phase and surface impedance are presented. The resonance is linearly tuned over a wide range of frequency and the phase contrivance nature allows the possibilities of reducing virtual prototyping time of geometries for reflectarray and holographic applications.