用于雷达散射截面（RCS）缩减的多频段交叉极化转换（CPC）超表面的设计与实验验证
Design and Experimental Validation of a Multiband Cross-Polarization Conversion (CPC) Metasurface for Radar Cross Section (RCS) Reduction
AI总结：
本文针对多频段雷达散射截面缩减问题，提出在FR4基板上设计单层交叉极化转换超表面的方法，该超表面在特定频率下极化转换率超95%，对应频段RCS缩减超10dBsm，斜入射下性能稳定，经实验验证，为相关应用提供了轻质、低成本且高性能的方案。
AI中文摘要：
雷达散射截面（RCS）缩减是现代隐身技术的基本要求，在航空和海军平台的低可观测性能中起关键作用。在各种无源RCS缩减策略中，基于超表面的交叉极化转换因其结构简单和低剖面而成为一种引人注目的方法。本文提出一种在具有成本效益的FR4介质基板（相对介电常数4.4，损耗角正切0.02）上开发的单层交叉极化转换（CPC）超表面，用于多频段RCS缩减。所设计结构在7.8GHz、11.7GHz和18GHz三个不同工作频率下实现了超过95%的极化转换率（PCR），对应频段下单站RCS缩减超过10dBsm。该超表面在高达60度的斜入射下仍具有稳定的极化转换性能。在消声室进行的实验验证与全波电磁模拟结果吻合良好，证实了所制造原型的可靠性。该设计为多频段隐身和低可观测平台应用提供了一种轻质、低成本且高性能的候选方案。
英文摘要：
Radar cross-section (RCS) reduction is a fundamental requirement in modern stealth technology, playing a critical role in the low-observable performance of aerial and naval platforms. Among the various passive RCS reduction strategies, including radar-absorbing materials, absorptive coatings, and artificially engineered surfaces, metasurface-based cross-polarization conversion has emerged as a compelling approach owing to its structural simplicity and low profile. In this work, a single-layer cross-polarization conversion (CPC) metasurface developed on a cost-effective FR4 dielectric substrate (relative permittivity 4.4, loss tangent 0.02) is proposed for multiband RCS reduction. The designed structure achieves a polarization conversion ratio (PCR) exceeding 95% at three distinct operating frequencies of 7.8 GHz, 11.7 GHz, and 18 GHz, spanning the C-, X-, and Ku-bands, which directly translates into a monostatic RCS reduction exceeding 10 dBsm at the corresponding bands. The metasurface further demonstrates stable polarization conversion performance under oblique incidence up to 60 degrees, confirming its suitability for wide-angle illumination conditions encountered in practical deployment scenarios. Experimental validation conducted in an anechoic chamber confirms close agreement with full-wave electromagnetic simulations, substantiating the reliability of the fabricated prototype. The proposed design offers a lightweight, low-cost, and high-performance candidate for multiband stealth and low-observable platform applications.
