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<p>Miniaturized frequency selective rasorber (FSR) designs often face critical challenges such as dependence on lumped resistive components, limited angular stability, increased profile due to multilayer configurations, and fabrication complexity. These limitations restrict their integration into compact and low-profile electromagnetic systems. In this study, a compact, dual-polarized FSR is proposed based on an interleaved geometric approach that avoids the use of any lumped passive elements. The structure consists of a single-layered absorber on top of a dielectric substrate combined with a bandpass filtering surface at the bottom. The interleaved design enables miniaturization by effectively combining eight surrounding unit cells into a central response, reducing the thickness to just <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(0.08\lambda_{0}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>0.08</mn> <msub> <mi>λ</mi> <mn>0</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> at the absorption frequency. The proposed FSR provides strong absorption at 12.2 GHz and a well-defined transmission band at 5.3 GHz, while maintaining polarization insensitivity and angular stability up to <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(45^\circ \)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>45</mn> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation>. To validate the design, a prototype was fabricated and tested under normal incidence, showing good agreement with simulated results.</p>

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A Miniaturized Single-Layered Frequency Selective Rasorber with Narrow Band Absorption Along a Transmission Band

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Seyed Hadi Hosseini,
  • Javad Nourinia,
  • Changiz Ghobadi

摘要

Miniaturized frequency selective rasorber (FSR) designs often face critical challenges such as dependence on lumped resistive components, limited angular stability, increased profile due to multilayer configurations, and fabrication complexity. These limitations restrict their integration into compact and low-profile electromagnetic systems. In this study, a compact, dual-polarized FSR is proposed based on an interleaved geometric approach that avoids the use of any lumped passive elements. The structure consists of a single-layered absorber on top of a dielectric substrate combined with a bandpass filtering surface at the bottom. The interleaved design enables miniaturization by effectively combining eight surrounding unit cells into a central response, reducing the thickness to just \(0.08\lambda_{0}\) 0.08 λ 0 at the absorption frequency. The proposed FSR provides strong absorption at 12.2 GHz and a well-defined transmission band at 5.3 GHz, while maintaining polarization insensitivity and angular stability up to \(45^\circ \) 45 ∘ . To validate the design, a prototype was fabricated and tested under normal incidence, showing good agreement with simulated results.