Radar shielding experiments by composite bilayer magnetic systems

TL;DR

This study demonstrates that composite bilayer magnetic systems significantly enhance radar reflection loss and absorption bandwidth, offering promising advancements for stealth technology through experimental validation in real radar conditions.

Contribution

The paper introduces novel composite bilayer systems that markedly improve microwave absorption and radar shielding, with experimental results validating their effectiveness under real radar conditions.

Findings

Reflection loss increased from 25 to 35 dB

Absorption bandwidth extended up to 20%

Unprecedented microwave absorption improvements

Abstract

An experimental strong increase of the reflection loss (from 25 up to 35 dBs) and an extension of the absorption bandwidth up to 20% is measured in a set of novel functional bilayer systems. We focus our work on studying the samples in an anechoic chamber under far-field real radar conditions. Each layer consists of a composite material, typically a dielectric matrix filled with random anisotropy hexaferrite and soft metallic materials (powder or wires). Combining the two types of materials into a submillimetric bilayer structure has shown unprecedented improvements in microwave absorption capacities compared to the former absorption of each layer. The capacity to improve the shielding behavior is strongly related to each layer permittivity, permeability, and thickness leading, therefore, to a strong control over the design of novel materials for stealth applications.