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<p>A wideband, high-absorption, and polarization-independent metamaterial (MTM) absorber featuring a circular ring cross-shaped resonator is designed and analyzed for Sub-6&#xa0;GHz 5G and 6G applications. The cross-shaped resonator is specifically engineered to achieve excellent absorption and strong polarization-independent characteristics. The proposed metamaterial absorber is fabricated on the top layer of a double-sided copper-coated FR4 substrate with a thickness of 0.8 mm. It exhibits an absorption rate of 99% across a wideband spectrum, covering bandwidths of 2.1 GHz (4.5–6.6 GHz) and 2.82 GHz (6.8–9.62 GHz). Additionally, it is well-suited for the 6G spectrum, particularly in the upper middle band ranging from 7.125 GHz to 8.5 GHz. The unit cell of the cross-shaped resonator metamaterial occupies an area of 0.13 λ0 × 0.13 λ0 with a thickness of 0.013 λ0. The absorption mechanism is explained through normalized input impedance and surface current distributions, while the metamaterial’s characteristics are analyzed in terms of permeability, permittivity, and refractive index. To validate its performance experimentally, the metamaterial is fabricated using chemical etching and tested in an anechoic chamber. A strong correlation between simulated and experimental results confirms the absorber’s suitability for Sub- 6&#xa0;GHz 5G applications and middle-band 6G applications.</p>

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Analysis of a Thin Polarization Insensitivewide Angle Dual Band Metamaterial Absorber for Sub-6 GHz 5G Applications and 6G Applications

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Bhupathi Ajay Kumar,
  • Yarlagadda Rama Krishna,
  • Avala Mallikharjuna Prasad

摘要

A wideband, high-absorption, and polarization-independent metamaterial (MTM) absorber featuring a circular ring cross-shaped resonator is designed and analyzed for Sub-6 GHz 5G and 6G applications. The cross-shaped resonator is specifically engineered to achieve excellent absorption and strong polarization-independent characteristics. The proposed metamaterial absorber is fabricated on the top layer of a double-sided copper-coated FR4 substrate with a thickness of 0.8 mm. It exhibits an absorption rate of 99% across a wideband spectrum, covering bandwidths of 2.1 GHz (4.5–6.6 GHz) and 2.82 GHz (6.8–9.62 GHz). Additionally, it is well-suited for the 6G spectrum, particularly in the upper middle band ranging from 7.125 GHz to 8.5 GHz. The unit cell of the cross-shaped resonator metamaterial occupies an area of 0.13 λ0 × 0.13 λ0 with a thickness of 0.013 λ0. The absorption mechanism is explained through normalized input impedance and surface current distributions, while the metamaterial’s characteristics are analyzed in terms of permeability, permittivity, and refractive index. To validate its performance experimentally, the metamaterial is fabricated using chemical etching and tested in an anechoic chamber. A strong correlation between simulated and experimental results confirms the absorber’s suitability for Sub- 6 GHz 5G applications and middle-band 6G applications.