Dual Band Metasurface-based Perfect Absorber for Ku band Applications

In this paper, a reflective metasurface that can work as a metasurface based perfect absorber in microwave frequency regime is presented. The unit cell consist of star shape copper layer with a square slot printed on FR4, the thickness of substrate is 2.4mm with loss tangent 0.02 backed by a metal ground. The proposed metasurface absorbs electromagnetic (EM) waves in two frequency bands specifically at frequencies from 13.82 – 14.02 GHz and 17.65 – 17.82 GHz. The absorption efficiencies of the proposed metasurface are above 90% within the operating frequency bands. The mirror symmetry of a structure make the response of metasurface same for both transverse electric (TE) or x-polarized and transverse magnetic (TM) or y-polarized incident waves.