Broadening the Bandwidth of Metamaterial Cloaks with Non-Foster Metasurfaces

TL;DR

This paper presents a novel active cloaking technology using non-Foster metasurfaces that significantly broadens the operational bandwidth of microwave cloaks, surpassing passive methods and enabling diverse practical applications.

Contribution

The paper introduces a practical design for broadband, ultrathin cloaks using active, non-Foster metasurfaces, extending cloaking bandwidths beyond passive limitations.

Findings

Achieved drastically reduced scattering over a wide microwave frequency range

Demonstrated practical, conformal active cloaking design

Surpassed passive cloaking bandwidth limitations

Abstract

We introduce the concept and practical design of broadband, ultrathin cloaks based on non-Foster, negatively capacitive metasurfaces. By using properly tailored, active frequency-selective screens conformal to an object, within the realm of practical realization, is shown to enable drastically reduced scattering over a wide frequency range in the microwave regime, orders of magnitude broader than any available passive cloaking technology. The proposed active cloak may impact not only invisibility and camouflaging, but also practical antenna and sensing applications.