Deep Learning-Enabled Invisible Electromagnetic Scattering Amplifier

TL;DR

This paper introduces an electromagnetic device that simultaneously remains invisible and amplifies the scattering signals of micro-targets, enhancing detection capabilities without revealing its own presence.

Contribution

It presents a novel design combining electromagnetic invisibility with scattering amplification using neural networks, overcoming previous limitations of separate functionalities.

Findings

Achieves up to 8.58 times scattering amplification for subwavelength targets.

Maintains invisibility while amplifying scattering regardless of target position or shape.

Demonstrates potential applications in radar detection and security.

Abstract

With the rapid development of micro-electro-mechanical systems, electrically small micro-targets, such as subwavelength micro unmanned aerial vehicles and bionic mosquito robots, exhibit ultra-low scattering cross section, which brings severe challenges to their effective detection. To address this problem, an Invisible Electromagnetic Scattering Amplifier (IESA) is designed by combining finite-element electromagnetic simulation with a forward lossless tandem neural network. The IESA realizes the dual-functional integration of intrinsic electromagnetic invisibility (near-zero scattering) for itself and significant scattering amplification for subwavelength targets entering its air sensing region. Electromagnetic simulations verify that the designed IESA can achieve a stable scattering amplification effect on subwavelength targets with a characteristic size of approximately 0.1{\lambda}0, regardless of their spatial positions or geometric shapes, with a maximum scattering cross section amplification factor of 8.58. The IESA breaks the technical bottleneck of the separate design of electromagnetic invisibility and scattering amplification functions. It shows potential for applications in the fields of radar detection, anti-terrorism security, micro-target monitoring, and adaptive electromagnetic sensing.