Study on C-Band Electromagnetic Wave Absorber made of S-Ring Resonator

This paper presents the characterization of rectangular s-ring resonator as an electromagnetic wave absorber for C band. The structure consists of copper s-ring patch in the top layer, FR-4 dielectric substrate, and the back is fully copper laminated. The initial dimension has 7 mm × 7 mm with the thickness of FR4 is 1 mm. The characterization observes the changes of each variable from the initial design that affect the shift in resonant frequency and bandwidth. Maximum bandwidth can be achieved at S-Ring length 4.4 mm for 0.0941 GHz.