A compact wideband metamaterial absorber for Ku band applications

A compact wideband metamaterial absorber (MA) for Ku band applications is presented in this paper. Ku band is a part of a microwave frequency spectrum ranging from 12 to 18 GHz. The proposed MA absorbs incident wave from 11.39 to 20.15 GHz with a bandwidth of 8.76 GHz which fully covers the Ku band. The proposed structure is compact having an overall dimension of 10 mm x 10 mm. The structure is fabricated on the FR4 substrate and the simulated result is carried using ANSYS HFSS 19.1. The absorption mechanism is illustrated by calculating effective electro magnetic (EM) parameters (epsilon(eff) & mu(eff)). Current distribution is also plotted in support of absorption mechanism. The structure is also examined at different angles (0(degrees)-90 degrees) for the oblique and normal incident. The proposed MA is tested inside the Anechoic Chamber and it was found that simulated and measured result is close to each other with variation within the tolerance limit. At last comparison of the proposed MA is done with already reported MA. MA presented in this paper finds applications for satellite communication radar surveillance and other defense applications.