Research on a Multiband Metamaterial Absorber

This paper describes the design of a multiband metamaterial absorber based on double-gap sheet metal and takes it into simulation by CST microwave studio. The results of simulation show that the metamaterial absorber achieves absorption rate up to 99.6%, 99.8%, 99.9% and 93.5% at 4.64 GHz, 8.67 GHz, 13.93 GHz and 18.53 GHz respectively. The thickness of the metamaterial absorber is just 3.3%, 6.3%, 10.0% and 13.3% of its working wavelength respectively. Finally, the absorption mechanism is analyzed by using the surface current, surface charge and the impedance matching theory. This metamaterial absorber has potential application in multifrequency radar, electromagnetic compatibility of complex electronic platform and so on.