Dual Band Absorber Based on Multilayer SSR

The need to protect telecommunications equipment from electromagnetic wave interference is increasing rapidly with technology development. This paper proposes an absorber based on AMC that can eliminate EM waves, which are expected in dual-band of 2.4 GHz and 3.7 GHz. The proposed metamaterial absorber is expected to achieve multiband bandwidth by using a square split ring resonator multilayer with the square patch on the top layer. The type of unit cell is SRR which has the advantage of a simple shape and can produce a resonant frequency depending on the number of rings and various changes on the split or gap. To provide wide bandwidth is using multilayer technique with adding air gap between split-ring resonator on the bottom layer and square patch as a compliment on the top layer. Characterizing the parameter is tested by a series of computer simulations, which is realized with dimensions of 132mm x 132mm. The proposed design work well based on the range 2.37 GHz - 2.42 GHz and 3.65 GHz - 4.3 GHz with an absorptivity rate above 90% on return loss minimum value at -10 dB. The absorptivity rate at 2.4 GHz is 96%, and 3.7 GHz is 98%.