Akademik Veri Yönetim Sistemi
Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi, cilt.14, sa.2, ss.789-801, 2021 (Hakemli Dergi)
In this study, a metamaterial (MM)-based microwave absorber working at three microwave bandwidths is
designed. The design works with 90% absorption in 3 different microwave bands, namely C band between 5.4
and 7.75 GHz, X band between 8.3 and 9.65 GHz and Ku band between 13.65 and 15 GHz respectively. The
polarization of the wave incoming to the designed metamaterial absorber is changed, and the percent
absorption is obtained exactly the same for TE and TM. In this respect, it is polarization insensitive absorber,
and strong absorption results have been obtained at various oblique incidence (10o
, 20o
and 30o
) for
absorption performance. For the analysis of the microwave absorber, the electrical permittivity and magnetic
permeability of the proposed metamaterial absorber is obtained in resonance. In addition, for impedance
analysis, the normalized impedance of the proposed metamaterial absorber is obtained. In the frequency
ranges where absorption is provided, it is observed that the normalized impedance of the absorber is almost
similar the normalized impedance of the air. In addition, the surface currents of the proposed metamaterial
absorber were obtained for the frequencies 5.67 GHz, 7.37 GHz, 8.76 GHz and 14.43 GHz where strong
resonance frequencies were realized. The maximum percent absorption rates at strong resonance frequencies
are compared with other reference studies. The transmission line equivalent circuit is given to understand the
behavior of the metamaterial absorber. CST Microwave Studio (CST) is used as an electromagnetic
simulation program.