# High-performance dendritic metamaterial absorber for broadband and near-meter wave radar

## TL;DR

This paper presents two composite metamaterial absorbers designed for broadband absorption in the UHF band, achieving over 90% absorption from 300-1000MHz with good incident angle tolerance and low-cost, lightweight materials.

## Contribution

The study introduces magnetic and dielectric metamaterial composites that enable broadband, high-efficiency absorption in the UHF band with simple, low-cost, and lightweight construction.

## Key findings

- Achieved over 90% absorption in 300-1000MHz range.
- Maintained over 80% absorption at incident angles up to 45 degrees.
- Used simple, low-cost materials like ITO film and PMI foam.

## Abstract

Absorbing materials in ultra-high frequency (UHF) band has constantly been a major challenge. The size of the absorber in UHF band is large, whereas the resonant frequency band is narrow. According to Rozanov's theory, two kinds of composite metamaterial absorbers are designed to realize the requirements of low-frequency broadband metamaterial microwave absorber: the magnetic-metamaterial composite absorber1 (MA1) and the dielectric-metamaterial composite absorber 2 (MA2). In the range of approximately 300-1000MHz, both absorbers achieve absorption of over 90% and feature good adaptability to the incident angle of the incident wave. The absorbers also present good absorption rate of over 80% in the range of 0-45 degree. Processing samples of indium tin oxide (ITO) resistance film and polymethacrylimide (PMI) foam board feature simple preparation and low cost, and the most important thing is to consider the weight problem, which features certain advantages in terms of use.

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Source: https://tomesphere.com/paper/1902.10398