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<p>This paper presents a low-profile, compact, single-layer metamaterial absorber (MMA) designed for C, X, and Ku band applications. The proposed absorber exhibits high polarization insensitivity up to 90°, with peak absorptivity values of 96%, 99%, and 98% at 5.4&#xa0;GHz, 9.65&#xa0;GHz, and 15.73&#xa0;GHz, respectively. The unit cell comprises two decagon-shaped ring resonators and a centrally positioned double cross-shaped resonator, forming a structure with four-fold symmetry that ensures polarization-independence performance. The unit cell was designed on a 1&#xa0;mm thick FR-4 substrate, and 10&#xa0;mm × 10&#xa0;mm unit cell dimensions, making it suitable for compact, frequency-selective applications. The absorber’s performance was evaluated using full-wave simulations in CST Microwave Studio under varying polarization angles and oblique incidence for both TE and TM modes, showing consistent absorption above 80% up to a 75° incidence angle. The absorption mechanism was studied through impedance matching, electric field and surface current distributions. Furthermore, an equivalent circuit model is designed using Advanced Design System (ADS) simulations, showing strong correlation with the CST full-wave simulation results. The dual-validation approach confirms the accuracy of the design and supports its integration into stealth, EMI reduction, and sensor systems.</p>

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Compact polarization-insensitive triple-band metamaterial absorber for C, X, and Ku band applications

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Inzamam Ahmad,
  • Yosef T. Aladadi,
  • Waleed Shihzad,
  • Fahad Haider,
  • Sulaiman Al-Sowayan,
  • Zaid Ahmed Shamsan,
  • Wazie M. Abdulkawi

摘要

This paper presents a low-profile, compact, single-layer metamaterial absorber (MMA) designed for C, X, and Ku band applications. The proposed absorber exhibits high polarization insensitivity up to 90°, with peak absorptivity values of 96%, 99%, and 98% at 5.4 GHz, 9.65 GHz, and 15.73 GHz, respectively. The unit cell comprises two decagon-shaped ring resonators and a centrally positioned double cross-shaped resonator, forming a structure with four-fold symmetry that ensures polarization-independence performance. The unit cell was designed on a 1 mm thick FR-4 substrate, and 10 mm × 10 mm unit cell dimensions, making it suitable for compact, frequency-selective applications. The absorber’s performance was evaluated using full-wave simulations in CST Microwave Studio under varying polarization angles and oblique incidence for both TE and TM modes, showing consistent absorption above 80% up to a 75° incidence angle. The absorption mechanism was studied through impedance matching, electric field and surface current distributions. Furthermore, an equivalent circuit model is designed using Advanced Design System (ADS) simulations, showing strong correlation with the CST full-wave simulation results. The dual-validation approach confirms the accuracy of the design and supports its integration into stealth, EMI reduction, and sensor systems.