Circuit Model Analysis of a Polarization and Wide Angle Independent Hexagonal Shaped Metamaterial Absorber
Keywords:
Circuit model analysis, metamaterial absorber, triple band, wide angle independentAbstract
This paper presents an equivalent circuit model of metamaterial absorber (MA) based on triple hexagonal shaped resonators. This metamaterial unit cell absorber possesses a nearly wide angle perfect absorption of incidence wave and polarization independence. The absorption is occurred in three different frequencies. The absorptivity is as high as 98%, 93% and 94%, at 3.5 (GHz), 4.7 (GHz) and 6.6 (GHz), respectively. The equivalent circuit model of a single hexagonal ring has been extended to the triple band absorber structure. The simulation of the circuit model agrees well with the full-wave simulation, regarding to return loss and absorption. The important features of this method are simple fabrication of metamaterial absorber and maximum absorption in three frequencies. The proposed metamaterial absorber has wide applications such as thermal detector, stealth technology and imaging. Moreover, a very good agreement between simulation and measurement results has been observed.
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