Double layer circular ring metamaterial absorber for dual-directional application at 10 GHz

This report presents a double layer circular ring metamaterial absorber working at 10 GHz for dual-directional application. The structure is designed using lossy FR4 substrate with thin copper layers. The circular ring shape, which is copper metal, is printed on both side of the metamaterial structure. A copper layer is placed between two layers of FR4 substrate. From the simulation, the double layer circular ring metamaterial absorber proved to work at wide incident angle as large as 70⁰, which maintain high absorbance, which is more than 88% for both TE and TM polarization incident waves. This kind of absorbance is also insensitive to any polarization state due to their shape of structure.