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<p>This paper presents a broadband absorber based on a circuit analog. The frequency-selective surface layer consists of a square ring structure embedded with a lumped resistor, and the absorber achieves 90% absorption at 5.35–19.38 GHz. The good properties of the absorber are explained by plotting the normalized impedance and absorptivity. An improved design method is then proposed using impedance matching. An envelope composed of glass fiber-reinforced epoxy is added to the outermost layer. The improved absorber achieves absorption performance of −25 dB at 6.32–16.92 GHz. The current distribution of the structure is plotted for frequencies belonging to the C, X, and Ku bands. The reflectivity curves for transverse magnetic (TM) and transverse electric (TE) polarization are also studied at different polarization angles. Two samples are fabricated, and the reflectivity is measured using the arch frame method. The measurement results show that absorption bandwidth of 12.1 GHz (5.4–17.5&#xa0;GHz) is achieved below −20 dB. At a maximum angle of incidence of 45°, good absorption performance is still maintained. The test results are generally consistent with the simulation analysis results.</p>

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Design and Improvement of a Layered Broadband Absorber Based on a Circuit Analog

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Chenyu Zhang,
  • Jiazhen He,
  • Lingfan Jiang,
  • Yonggang Xu,
  • Xinyu Hou

摘要

This paper presents a broadband absorber based on a circuit analog. The frequency-selective surface layer consists of a square ring structure embedded with a lumped resistor, and the absorber achieves 90% absorption at 5.35–19.38 GHz. The good properties of the absorber are explained by plotting the normalized impedance and absorptivity. An improved design method is then proposed using impedance matching. An envelope composed of glass fiber-reinforced epoxy is added to the outermost layer. The improved absorber achieves absorption performance of −25 dB at 6.32–16.92 GHz. The current distribution of the structure is plotted for frequencies belonging to the C, X, and Ku bands. The reflectivity curves for transverse magnetic (TM) and transverse electric (TE) polarization are also studied at different polarization angles. Two samples are fabricated, and the reflectivity is measured using the arch frame method. The measurement results show that absorption bandwidth of 12.1 GHz (5.4–17.5 GHz) is achieved below −20 dB. At a maximum angle of incidence of 45°, good absorption performance is still maintained. The test results are generally consistent with the simulation analysis results.