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<p>Polarization, a fundamental property of electromagnetic waves, plays a pivotal role in radar detection, wireless communications, and optical imaging. Conventional polarization converters often suffer from narrow bandwidths and performance degradation in the millimeter-wave regime (e.g., the Ka band), limiting their utility in emerging fifth- and sixth-generation systems. This study presents a compact metasurface unit cell (0.202<i>λ</i><sub>0</sub>×0.202<i>λ</i><sub>0</sub>×0.103<i>λ</i><sub>0</sub>) based on elliptical split-rings and metallic strips, achieving ultra-wideband polarization conversion across X, Ku, K, and Ka bands. Simulation results demonstrate a polarization conversion ratio (PCR) exceeding 90% within 10.4–36.5 GHz (fractional bandwidth: 111%), with angular resilience sustaining PCR values above 80% at 38° oblique incidence over 13.6–26.3 GHz. By integrating phase-coding strategies, multiple functionalities—including beamforming and radar cross-section reduction—are realized, outperforming conventional single-function designs. The proposed metasurface integrates miniaturized structures with multifunctionality, offering a versatile platform for next-generation radar stealth, high-frequency communication, and intelligent sensing systems. Its ultra-wideband operation, compactness, angular robustness, and multifunctional capability collectively underscore its significant potential for advanced engineering applications.</p>

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Reflective ultra-wideband and angularly robust polarization conversion metasurface for coded beamforming and RCS reduction

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Wenjun Cai,
  • Xiaohan Liu,
  • Xuan Yang,
  • Ziyu Zhang,
  • Hongya Wu,
  • Zixuan Liu,
  • Zidong Zhang,
  • Lixin Xuan

摘要

Polarization, a fundamental property of electromagnetic waves, plays a pivotal role in radar detection, wireless communications, and optical imaging. Conventional polarization converters often suffer from narrow bandwidths and performance degradation in the millimeter-wave regime (e.g., the Ka band), limiting their utility in emerging fifth- and sixth-generation systems. This study presents a compact metasurface unit cell (0.202λ0×0.202λ0×0.103λ0) based on elliptical split-rings and metallic strips, achieving ultra-wideband polarization conversion across X, Ku, K, and Ka bands. Simulation results demonstrate a polarization conversion ratio (PCR) exceeding 90% within 10.4–36.5 GHz (fractional bandwidth: 111%), with angular resilience sustaining PCR values above 80% at 38° oblique incidence over 13.6–26.3 GHz. By integrating phase-coding strategies, multiple functionalities—including beamforming and radar cross-section reduction—are realized, outperforming conventional single-function designs. The proposed metasurface integrates miniaturized structures with multifunctionality, offering a versatile platform for next-generation radar stealth, high-frequency communication, and intelligent sensing systems. Its ultra-wideband operation, compactness, angular robustness, and multifunctional capability collectively underscore its significant potential for advanced engineering applications.