用于无线体域网的高鲁棒性可穿戴天线设计  

Design of a wearable antenna with high robustness for wireless body area network applications

作　　者：杨帅超 李霖[1] 顾小卫[1] YANG Shuaichao;LI Lin;GU Xiaowei(School of Information Science and Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学信息学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第1期89-96,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：激光与物质相互作用国家重点实验室开发基础研究课题(SKLLIM2113)。

摘　　要：为了在无线体域网中实现可穿戴设备与基站间的体外通信,设计了一种工作在WLAN(2.40~2.48 GHz)频段的高鲁棒性可穿戴天线。采用微带贴片结构,实现了天线体外模式辐射;采用完整铜箔作为天线的地面,提高了天线的鲁棒性;采用耦合馈电与槽缝曲流技术,增加了天线的阻抗带宽。进一步制作了天线实物,测试并比较了天线在自由空间内、加载人体后和改变外部环境后不同阶段的反射系数与辐射增益结果,以及加载人体后的链路余量与人体比吸收率的情况。结果表明:在自由空间内和加载人体后,天线阻抗带宽均可以覆盖WLAN频段,且天线具有体外模式的辐射方向图。在外部环境变化时,天线均谐振在了WLAN频段内,最大辐射增益变化仅有3.04%,证明了天线具有较高的鲁棒性。在不伤害人体的情况下实现了无线体域网中可穿戴设备与基站间的高鲁棒性体外通信。In order to realize off-body communication between wearable devices and base stations in wireless body area networks, a wearable antenna with high robustness in WLAN frequency band is proposed. The microstrip patch structure is adopted to realize off-body mode radiation of the antenna;a complete copper foil is used as the ground of the antenna to improve the robustness of the antenna;the coupled feeding and slotting & meandering technology is adopted to increase the impedance bandwidth of the antenna. In order to verify the robustness of antenna communication, the antenna is further fabricated. The reflection coefficient and radiation gain of the antenna in free space, after loading the human body and after changing the external environment, as well as the link margin and the specific absorption rate of the human body after loading the human body are tested. The results show that both in free space and after loading the human body, the impedance bandwidth of the antenna can cover the WLAN frequency band, and the antenna has an off-body mode radiation pattern. With the change of the external environment, the antenna resonance frequencies all fall into the WLAN frequency band and the maximum radiation gain change is merely 3.04%, demonstrating that the proposed antenna has high robustness. And the high robust off-body communication between the wearable device and the base station in the wireless body area networks is realized without harming the human body.

关 键 词：可穿戴天线 体外模式 耦合馈电 无线体域网 鲁棒性 

分 类 号：TN820[电子电信—信息与通信工程]