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Realization of single layer Fourier phased metasurfaces for wideband RCS reduction

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journal contribution
posted on 2023-01-23, 09:11 authored by Mustafa K Taher Al-Nuaimi, Guan-Long Huang, William WhittowWilliam Whittow, Rui-Sen Chen, Sai-Wai Wong

An efficient and fast strategy to design and realize single layer Fourier phased metasurfaces for wideband radar cross section (RCS) reduction when illuminated by a circular polarization (CP) plane wave is proposed in this letter. The scattering phase (between 0o and 360o ) required at each unit cell of the proposed metasurfaces was computed using the Fourier phase formula in which the focal length ( F ) is inversely proportional to the phase distribution. Pancharatnam-Berry (PB) phase theory was applied with unit cells of subwavelength periodicity to further enhance the scattering and RCS reduction characteristics. The proposed wideband Fourier phased metasurface has a square shape and contains 30 × 30 PB unit cells with subwavelength periodicity of 5 mm ≈ 0.26λ16GHz . Both simulation and measured results show that the proposed Fourier phased metasurfaces can achieve more than 10 dB of RCS reduction under normal incidence of CP plane wave regardless of the value of F . Under oblique incidence, more than 10 dB of RCS reduction was maintained for incident angles up to 60°. In addition, the single-layer Fourier phased metasurface features wideband 10 dB RCS reduction bandwidth from 10 GHz to 24 GHz with a thickness of only 2 mm. This resulted in an 82.3% fractional bandwidth (FBW) of RCS reduction which is higher than other designs reported in the literature. The proposed design strategy provides a promising way to design and realize metasurfaces for wideband and stable RCS reduction performance without the need to use a computationally complex and/or time-consuming and slow running optimization algorithm.

Funding

State Key Laboratory of Millimeter waves, Southeast University, China (Grant Number: K202317)

Newton International Fellowship (Grant Number: NIF\R1\222093)

Anisotropic Microwave/Terahertz Metamaterials for Satellite Applications (ANISAT)

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Antennas and Wireless Propagation Letters

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Version

AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publication date

2023-01-11

Copyright date

2023

ISSN

1536-1225

eISSN

1548-5757

Language

en

Depositor

Prof Will Whittow. Deposit date: 21 January 2023