Abstract: In order to achieve broadband stable absorption of electromagnetic wave, a microwave broadband perfect metamaterial absorber (MA) with a smooth absorption band is designedin this paper. The equivalent circuit model and COMSOL simulation software is used to optimize the structure parameters of the MA. The origin of the absorption mechanism is analyzed by the electric field and surface current distributions, and which is also explained by the equivalent input impedance. The polarization and oblique incidence characteristics and the absorption response of each layer are further studied. Results show that the absorptivity of the MA proposed in this paper is more than 90% in the range of 5—9.2 GHz, and the average absorption of the MA is 97.71%, perfect absorption happened in the broadband of 5.9—8 GHz (the absorptivity is more than 99%, and the reflectivity is less than 1%), and the structure has good polarization and wide incident angle stability. The thickness and unit size of the MA proposed in this paper are 0.12λ0 and 0.29λ0×0.29λ0 (λ0 is the wavelength at the center frequency of the absorption band), respectively. Moreover, by changing the permittivity of the dielectric substrate, the operating band can be adjusted on the premise that the waveform is basically unchanged, it has good frequency band portability and can be applied to stealth technology, electromagnetic compatibility, and other fields.
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2021, Vol. 35 
