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<p>A novel multifunctional bi-anisotropic omega metasurface (MS) that simultaneously supports polarization transformation in both reflection and transmission modes, as well as narrow bandpass transmission functionality, is proposed by combining a patterned polarization-converting surface with a cross-dipole bandpass frequency-selective surface (BP-FSS). The BP-FSS, etched inside the metal ground, provides a reflection-transmission frequency response and acts as an equivalent ground plane. When the incident wave is illuminated from +<i>Z</i>-side (forward direction), the entire MS exhibits two reflective circularly polarized and cross-polarized bands separated by a low-loss bandpass window. Under the −<i>Z</i>-side (backward direction) excitation, the structure functions as a partial reflector (PR) outside the bandpass region without altering the polarization state of the incident wave. For both ±<i>Z</i>-sided excitation, the MS maintains symmetric transmission responses, realizing a narrow bandpass window with an insertion loss (IL) of less than − 1 dB and two partial transmissive cross-polarization (TCP) conversion bands. The proposed concept is validated through equivalent circuit models (ECMs) of the BP-FSS and the cascaded MS, along with measurements of a fabricated 17 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\times\)</EquationSource> </InlineEquation> 29 unit-cell prototype, confirming excellent agreement with simulations. Compared with existing MSs, the proposed design uniquely combines multiple functionalities, making it a potential alternative to frequency-selective rasorbers and a promising candidate for antennas and communication system applications.</p>

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A multifunctional bi-anisotropic metasurface with reflection-transmission polarization conversion and narrow bandpass transmission characteristics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月17日

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  • Muhammad Nasir,
  • Slawomir Koziel,
  • Anna Pietrenko-Dabrowska

摘要

A novel multifunctional bi-anisotropic omega metasurface (MS) that simultaneously supports polarization transformation in both reflection and transmission modes, as well as narrow bandpass transmission functionality, is proposed by combining a patterned polarization-converting surface with a cross-dipole bandpass frequency-selective surface (BP-FSS). The BP-FSS, etched inside the metal ground, provides a reflection-transmission frequency response and acts as an equivalent ground plane. When the incident wave is illuminated from +Z-side (forward direction), the entire MS exhibits two reflective circularly polarized and cross-polarized bands separated by a low-loss bandpass window. Under the −Z-side (backward direction) excitation, the structure functions as a partial reflector (PR) outside the bandpass region without altering the polarization state of the incident wave. For both ±Z-sided excitation, the MS maintains symmetric transmission responses, realizing a narrow bandpass window with an insertion loss (IL) of less than − 1 dB and two partial transmissive cross-polarization (TCP) conversion bands. The proposed concept is validated through equivalent circuit models (ECMs) of the BP-FSS and the cascaded MS, along with measurements of a fabricated 17 \(\times\) 29 unit-cell prototype, confirming excellent agreement with simulations. Compared with existing MSs, the proposed design uniquely combines multiple functionalities, making it a potential alternative to frequency-selective rasorbers and a promising candidate for antennas and communication system applications.