The prolonged radiation exposure from mobile phone antennas may cause several health problems. In this article, an innovative method derived from a metasurface-based phone case is introduced to reduce the electromagnetic (EM) exposure from mobile phones. A metasurface consisting of 2 × 3 unit cells, is directly printed on a commercially available phone case. The effective utilization of the slotted square metallic metasurface with the phone cover, the EM exposure, expressed as specific absorption rate (SAR) is significantly reduced by more than 26%. Moreover, the overall performance of the mobile antenna including operating bandwidth and gain is also improved using the proposed metasurface phone case. To validate the design concept, SAR is analyzed for the mobile antenna with and without the proposed phone case with the mannequin model that closely resembles a human head. The measurement data shows that the SAR value is reduced in the human head from 1.387 W/kg to 0.985 W/kg using the metasurface-integrated phone case. The proposed method not only provides an effective way to suppress mobile phone radiation exposure but also invites other researchers to explore metasurface-based phone cases to minimize the health risks from radiation exposure to cell phones and other handheld devices.

中文翻译：

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用于降低 5G 手机 SAR 的超表面手机壳

手机天线的长时间辐射可能会导致多种健康问题。在本文中，介绍了一种源自超表面手机壳的创新方法，可减少手机的电磁 (EM) 暴露。由 2 × 3 单元组成的超表面直接印刷在市售手机壳上。开槽方形金属超表面与手机盖的有效利用，以比吸收率 (SAR) 表示的电磁暴露显着降低了 26% 以上。此外，使用所提出的超表面手机壳还提高了移动天线的整体性能，包括工作带宽和增益。为了验证设计理念，我们使用非常类似于人头的人体模型对带有和不带有所提出的手机壳的移动天线的 SAR 进行了分析。测量数据显示，使用超表面集成手机壳后，人体头部的SAR值从1.387 W/kg降低至0.985 W/kg。所提出的方法不仅提供了抑制手机辐射暴露的有效方法，而且还邀请其他研究人员探索基于超表面的手机壳，以尽量减少手机和其他手持设备辐射暴露的健康风险。