Ultra-wideband RCS reduction realized by a coding diffusion metasurface

Abstract

In this study, a coding diffusion metasurface (CDMS) based on a circular-polarization (CP)-maintaining metasurface is proposed for radar cross-section (RCS) reduction. The CP-maintaining metasurface can achieve ultra-wideband CP-maintaining reflection, and its main reflection phase under CP incidence can be adjusted at will by the Pancharatnam-Berry phase generated by the rotation of its unit cell, so it can be used to design CDMS. Thus, based on the CP-maintaining metasurface, the 2-bit CDMS is proposed. The simulated and measured results demonstrate that the CDMS can achieve highly effective and ultra-wideband RCS reduction under arbitrarily polarized incidences, compared with a pure metallic plate of the same size, its RCS can be reduced by more than 10 dB under normal incidence in the ultra-wide frequency band of 7.1-33.6 GHz with a relative bandwidth of 130.2%; moreover, when the incident angle is increased to 40°, an ultra-wideband RCS reduction can still be achieved.

KEYWORDS:

• Metasurface
• Pancharatnam-Berry phase
• radar cross section (RCS)

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

Data available on request from the author.

Additional information

Funding

This study was supported by the National Natural Science Foundation of China (grant number 62072378), and Key Research and Development Plan of Xianyang City (L2023-ZDYF-XCZX-006).