Design and Investigation of Polarization Independent Dual-Band Metamaterial Absorber

Abstract

The vital objectives of this exploration were to design and investigate the polarization independent dual-band metamaterial absorbers. The inner square loop controls the resonant frequency of EM wave at 10 GHz (X-band) as per structure shows a maximum absorption of 99.95% while outer circular loop controls the EM wave resonant frequency at 5 GHz (C-band) of 99.99%. The most interesting finding of this simulated result under oblique incident record over 99% absorptivity variation at different absorber elevation angles ranging from 15° until 75° at every step angle of 15°, thus it be independent polarize in TE and TM mode. The absorptivity variation of the absorber at difference azimuth angles under oblique incidence in both TE and TM polarization at each of the two resonant peaks result state that 15°, 30°, 45° and 60° remains higher than 85% except for 75° at 63% absorptivity response. The normalized input impedance was investigated and reveals that real part of the normalized impedance is near to unity, while the imaginary part becomes zero as there is no reflection.