In this study, multi‐band antenna for LTE wearable device with shared slots and radiators for smart watch was present. This study incorporated 4G communication frequency bands, a GPS positioning system, and BT/Wi‐Fi in a 43.6 × 43.6 × 5.8 mm³ metal case to achieve satisfactory radiation fields and performance efficiency within a small space. This article presents an overview of the theory. There are four ports in the system. Frist, Port 1 is a low‐frequency antenna offering LTE 700 and GSM 850/900. The maximal gain and efficiency are respectively 3.9 dBi and 82%. Second, Port 2 is a high‐frequency monopole with a winding long path on the side of the frame to achieve a reflection loss bandwidth that fully encompasses GSM 1800/1900/UMTS and LTE 2300/2500. The maximal gain and efficiency of this port are respectively 5.3 dBi and 92%. There are also have GPS (Port 3) and Wi‐Fi (Port 4) antenna implement IFA and loop excitation mechanisms, respectively. This antenna system can fulfill the market demand. As confirmed through both simulation and measurement, the antenna can cover LTE bands. Increasing the path capacity of a MIMO system to increase the transmission speed is a crucial focus in mobile communication research and development.

中文翻译：

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具有共用插槽和智能手表辐射器的LTE可穿戴设备多频带天线设计

在这项研究中，提出了具有可共享插槽和用于智能手表的辐射器的LTE可穿戴设备的多频带天线。这项研究在43.6×43.6×5.8 mm ^3中合并了4G通信频段，GPS定位系统和BT / Wi-Fi。金属外壳可在较小的空间内获得令人满意的辐射场和性能效率。本文介绍了该理论的概述。系统中有四个端口。首先，端口1是提供LTE 700和GSM 850/900的低频天线。最大增益和效率分别为3.9 dBi和82％。其次，端口2是高频单极子，在框架的侧面具有较长的缠绕路径，以实现反射损耗带宽，该带宽完全涵盖GSM 1800/1900 / UMTS和LTE 2300/2500。该端口的最大增益和效率分别为5.3 dBi和92％。还分别具有GPS（端口3）和Wi-Fi（端口4）天线实现IFA和环路激励机制。该天线系统可以满足市场需求。正如通过仿真和测量所证实的那样，该天线可以覆盖LTE频段。