Design of wideband metamaterial absorber using circuit theory for X‐band applications

Abstract

A broadband metamaterial absorber working in the X‐band is designed and fabricated by 3D printing in this study. This structure is capable of nearly absorbing the power of incoming waves (more than 90%) in the frequency band starting from 7.1 to 13.8 GHz. This metamaterial absorber is designed based on an infinite array of conductive ribbons, and the thickness of the absorber is just 0.1λ for the minimum frequency (without considering the thickness of the ground layer). A circuit model and transmission line theory are used to design and explain the absorption principle of the proposed structure. Our novel design method is flexible and can be applied to other frequency bands. The satisfaction of the proposed absorber can be applied to many applications namely communication, electromagnetic shielding, radar and satellite. Furthermore, due to the flexibility of the substrate, the proposed absorber is also suitable for flexible applications in the X‐band.

Ultra-thin wideband frequency tunable metamaterial absorber and its application for antenna radar cross section reduction

“…The absorbing capacity of MMAs arises from electromagnetic resonance, giving rise to its inherent limitation of a significantly narrow absorption bandwidth. While a considerable number of broadband or ultrabroadband passive metamaterial absorbers have been developed, the majority of them are unable to mitigate the increase in profile thickness [10][11][12][13][14]. In the design of MMAs, three critical factors that require attention are absorption bandwidth, absorption rate, and profile thickness.…”