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<p>This article presents a novel design for a metasurface-based mobile phone back cover aimed at reducing electromagnetic exposure across both low GHz (2-8 GHz) and millimeter wave (22-25.6 GHz) frequency bands. The metasurface, integrated into a commercial mobile cover, is optimized using characteristic mode analysis, and the material properties of the back cover are evaluated through the T-resonator method. To assess the effectiveness of the modified back cover, a six-port printed Multiple Input Multiple Output (MIMO) antenna is designed on an FR4 substrate for both low GHz and millimeter wave applications. This MIMO antenna, in combination with the modified back cover, achieves an average port isolation of over 20 dB in both frequency bands. The performance of the MIMO antenna with the modified back cover is validated using electromagnetic simulations combined with a mobile phone model. Specific absorption rate (SAR) assessments using a human head model in simulations reveal reductions from 2.488 W/kg to 1.465 W/kg (41.11%) in the low GHz band, and from 3.101 W/kg to 1.521 W/kg (50.95%) in the millimeter wave band. Prototypes of the MIMO antenna and the modified mobile back cover with metasurface are fabricated and tested, showing strong agreement between simulated and measured results. As mobile back covers are commonly used as protective accessories, the proposed design adds value by simultaneously improving wireless performance and SAR reduction.</p>

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Dual-Broadband Metasurface Printed on Mobile Phone Back Cover for Enhanced Antenna Performance and SAR Reduction

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Juin Acharjee,
  • Muhammad Uzair,
  • Thipamas Phakaew,
  • Apichart Kaewcharoen,
  • Jawad Ali,
  • Kaushik Mandal,
  • Prayoot Akkaraekthalin,
  • Suramate Chalermwisutkul

摘要

This article presents a novel design for a metasurface-based mobile phone back cover aimed at reducing electromagnetic exposure across both low GHz (2-8 GHz) and millimeter wave (22-25.6 GHz) frequency bands. The metasurface, integrated into a commercial mobile cover, is optimized using characteristic mode analysis, and the material properties of the back cover are evaluated through the T-resonator method. To assess the effectiveness of the modified back cover, a six-port printed Multiple Input Multiple Output (MIMO) antenna is designed on an FR4 substrate for both low GHz and millimeter wave applications. This MIMO antenna, in combination with the modified back cover, achieves an average port isolation of over 20 dB in both frequency bands. The performance of the MIMO antenna with the modified back cover is validated using electromagnetic simulations combined with a mobile phone model. Specific absorption rate (SAR) assessments using a human head model in simulations reveal reductions from 2.488 W/kg to 1.465 W/kg (41.11%) in the low GHz band, and from 3.101 W/kg to 1.521 W/kg (50.95%) in the millimeter wave band. Prototypes of the MIMO antenna and the modified mobile back cover with metasurface are fabricated and tested, showing strong agreement between simulated and measured results. As mobile back covers are commonly used as protective accessories, the proposed design adds value by simultaneously improving wireless performance and SAR reduction.