Ultra-broadband Microwave Metamaterial Absorber

TL;DR

This paper presents a microwave metamaterial absorber with ultra-broadband, polarization-independent absorption achieved through a periodic array of multilayered pyramids, covering 7.8-14.7 GHz with over 90% efficiency.

Contribution

It introduces a novel design of multilayered pyramids that achieve ultra-wideband absorption, validated by experiments and simulations.

Findings

Achieves over 90% absorption from 7.8 to 14.7 GHz.

Maintains high absorption for incident angles less than 60 degrees.

Experimental results align well with numerical 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 7.8-14.7GHz, and the absorption is kept large when the incident angle is smaller than 60 degrees. The experimental results agree well with the numerical simulation.