In this work, both planar and conformal novel electromagnetic interference (EMI) shielding structures with customized properties are developed using a unique coupling of frequency-selective surface (FSS) and magnetic substrate. A hybrid equivalent circuit model (ECM) blended whale optimization (WO) technique is offered in the quest of customized shielding of $L$ -, $S$ -, $C$ -, $X$ -, and $Ku$ -bands using a simple FSS geometry. The proposed structure is designed to shield $L$ -, $S$ -, $C$ -, $X$ -, and $Ku$ -bands with a fractional bandwidth of 66.67%, 66.67%, 66.67%, 50.2%, and 40.50%, respectively. The frequency-dependent complex dielectric permittivity ( $\epsilon '$ – $j\epsilon ''$ ) and complex magnetic permeability ( $\mu '$ – $j\mu ''$ ) of ferrite are measured using a waveguide measurement setup at $X$ -band. The measured electromagnetic parameters are utilized in the modeling of planar and conformal ferrite-based frequency-selective shielding structures. An optimal ferrite coupled FSS shielding structure is fabricated, and its performance is evaluated using a non-destructive free-space microwave measurement setup. The measured results are found in congruence with the full-wave simulation and WO results. Besides, the conformal configuration of the proposed shielding structure is peculiarly investigated for inward and outward curved shielding structures for different values of radius of curvature. The proposed technique is intended to achieve a customized, simple, wideband, polarization-insensitive, and angular stable structure in the desired frequency regime, thus verifying the potential of the aforementioned technique for shielding applications.

中文翻译：

---

使用铁氧体衬底的混合 ECM 混合优化推导频率选择共形 EMI 屏蔽结构

在这项工作中，使用频率选择表面 (FSS) 和磁性基板的独特耦合开发了具有定制特性的平面和共形新型电磁干扰 (EMI) 屏蔽结构。一种混合等效电路模型 (ECM) 混合鲸鱼优化 (WO) 技术用于寻求定制屏蔽 $L$ -, $S$ -, $C$ -, $X$ -， 和 $Ku$ - 使用简单的 FSS 几何的波段。建议的结构旨在屏蔽 $L$ -, $S$ -, $C$ -, $X$ -， 和 $Ku$ - 部分带宽分别为 66.67%、66.67%、66.67%、50.2% 和 40.50% 的频带。频率相关的复介电常数 ( $\epsilon '$ —— $j\epsilon ''$ ) 和复磁导率 ( $\mu'$ —— $j\mu ''$ ) 的铁氧体是使用波导测量装置测量的 $X$ -乐队。测量的电磁参数用于平面和共形铁氧体基选频屏蔽结构的建模。制造了一种最佳的铁氧体耦合 FSS 屏蔽结构，并使用非破坏性自由空间微波测量装置评估其性能。发现测量结果与全波模拟和 WO 结果一致。此外，针对不同曲率半径值的向内和向外弯曲屏蔽结构，特别研究了所提出的屏蔽结构的共形配置。所提出的技术旨在在所需的频率范围内实现定制的、简单的、宽带的、偏振不敏感的和角稳定的结构，