Results in Physics (Mar 2023)

A flexible transparent absorber bandwidth expansion design based on characteristic modes

  • Meng Suo,
  • Han Xiong,
  • Xin-Ke Li,
  • Qi-Feng Liu,
  • Huai-Qing Zhang

Journal volume & issue
Vol. 46
p. 106265

Abstract

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In this paper, a flexible transparent absorber with broadband absorption is presented theoretically and demonstrated experimentally, which is composed of five layers. Based on the characteristic mode theory, the absorption bandwidth and modal significance of a narrow band absorber were analyzed with the modal radiation patterns and surface current, respectively. To expand the bandwidth, the effective modes and the positions where the resistors should be loaded were determined with the help of characteristic mode analysis. It has a broadband absorption in the frequency range of 14.3–28.3 GHz with a relative absorption bandwidth of about 65.72 %, and the corresponding absorptance is more than 90 %. Meanwhile, the optimized absorber also achieves a satisfactory absorption rate up to 45° incident angle for both TE and TM polarizations. The experimental results show excellent absorption rates, which indicates a good agreement with the simulated results.

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