Design of broadband electromagnetic absorber using resistive Minkowski loops

Lossy frequency selective surfaces have been used to design thin and broadband electromagnetic absorbers. Unit cell of the FSS is based on two concentric Minkowski loops. In the first design, the Minkowski loops are loaded with lumped resistors in different configurations. In the second design, Minkowski loops are designed using the concept of resistive sheets. Resistive Minkowski loops offer very wide bandwidth from 2.2GHz to 9.4GHz and 4.5GHz to 17GHz for reflection loss greater than 10dB. Thickness of the absorber with resistive Minkowski loops is 0.09λ.