Design Simulation and Analysis of a Polarization-Independent Ultrathin Pixelated Metasurface Absorber

摘要

A polarization independent, ultrathin, planar, and conformal microwave absorber is presented for X-band application. An efficient metasurface absorber comprising of an array of pixelated unit cells over a grounded lossy substrate is designed using a simple simulation-driven approach. Subsequently, the absorption mechanism of the proposed absorber is demonstrated by means of straightforward analytical expressions derived from the transmission line approach. Finally, the equivalent circuit model is validated by performing the simulation of the lumped equivalent circuit of the absorber. The notable features of the proposed absorber are its design on a λ0 ⁄ 154 (0.177 mm) ultrathin substrate and its absorptivity characteristics of over 94% at 11.03 GHz for all angle of polarization. Also, the proposed absorber maintains more than 80% absorptivity up to 45° incident angle and demonstrates its suitability for conformal applications.