Ultra-broadband microwave metamaterial absorber

TLDR

The absorber consists of a periodic array of metal‑dielectric multilayered quadrangular frustum pyramids whose overlapping resonant modes produce ultra‑wideband absorption. The device achieves >90 % absorption from 7.8 to 14.7 GHz at normal incidence and remains high up to 60° incidence, matching simulations.

Abstract

A microwave ultra-broadband polarization-independent metamaterial absorber is demonstrated. It is composed of a periodic array of metal-dielectric multilayered quadrangular frustum pyramids. These pyramids possess resonant absorption modes at multi-frequencies, of which the overlapping leads to the total absorption of the incident wave over an ultra-wide spectral band. The experimental absorption at normal incidence is above 90% in the frequency range of 7.8–14.7 GHz, and the absorption is kept large when the incident angle is smaller than 60°. The experimental results agree well with the numerical simulation.