Design of Efficient Smartwatch Antenna by Exploring Monopole Mode

IF 3.7 2区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Antennas and Wireless Propagation Letters Pub Date : 2025-02-14 DOI:10.1109/LAWP.2025.3542083

Wenrui Zheng;Tian Xi Feng;Hui Li

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Abstract

Designing an efficient low-band (below 1 GHz) antenna in smartwatches with metal frames has been challenging due to the inefficient radiation from the slot formed by the ground plane and metal frame. In this letter, a practical antenna configuration is proposed for the smartwatch to provide more efficient radiation at the low-band. By analyzing different radiating modes of the platform, it has been found that modifications on the inherent flexible printed circuit (FPC) in the smartwatch can guide the field towards a more efficient distribution, thereby enhancing the radiation efficiency in user scenarios. Seven fundamental models, along with their corresponding radiation efficiency, electric field distributions, and radiation patterns, are thoroughly examined to support the study. As a result, a larger and more protruding FPC significantly improves low-band antenna efficiency by around 5 dB, without any change in antenna itself and the surroundings. Prototypes were fabricated to validate the findings, with measured results agreeing well with the simulated ones.

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基于单极子模式的高效智能手表天线设计

在金属框架的智能手表中设计高效的低频段（低于1ghz）天线一直是一项挑战，因为地平面和金属框架形成的缝隙辐射效率低下。在这封信中，提出了一种实用的天线配置，用于智能手表在低频段提供更有效的辐射。通过分析平台的不同辐射模式，发现对智能手表固有柔性印刷电路（FPC）进行修改，可以引导场向更有效的分布，从而提高用户场景下的辐射效率。七个基本模型，以及它们相应的辐射效率、电场分布和辐射模式，被彻底地检验以支持这项研究。因此，一个更大、更突出的FPC显著提高了低频段天线效率约5db，而天线本身和周围环境没有任何变化。制作了原型来验证这些发现，测量结果与模拟结果吻合得很好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Antennas and Wireless Propagation Letters 工程技术-电信学

CiteScore

8.00

自引率

9.50%

发文量

529

审稿时长

1.0 months

期刊介绍： IEEE Antennas and Wireless Propagation Letters (AWP Letters) is devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation. These are areas of competence for the IEEE Antennas and Propagation Society (AP-S). AWPL aims to be one of the "fastest" journals among IEEE publications. This means that for papers that are eventually accepted, it is intended that an author may expect his or her paper to appear in IEEE Xplore, on average, around two months after submission.