面向物联网设备的性能稳定型柔性可穿戴滤波天线
Flexible Wearable Filtering Antenna With Stable Performance for IoT Devices
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中文总结 AI 辅助
该研究提出一款无需额外电路的柔性可穿戴滤波天线，通过加载特殊槽结构实现性能稳定，经测试其带宽、带外抑制等指标优异，适用于可穿戴物联网设备。
中文摘要 AI 辅助
本文提出一种无需额外电路的柔性轻量化可穿戴滤波天线。该天线以一款具备轻量化结构的柔性定向天线为基础，包含一层超薄柔性基板、一层金属地平面，以及夹在两者之间的柔性泡沫层。随后，通过在印刷于柔性基板上的辐射贴片上引入两对垂直槽，无需额外电路即可在两个带边实现辐射零点。此外，为缓解不同曲率下带内辐射的恶化，在辐射贴片上加载一对倒F形槽，该倒F形槽的耦合作用可抑制沿曲率方向的非辐射横向电流分量，从而使天线在弯曲后保持性能稳定。另外，采用三层人体组织模型对所提天线在不同弯曲半径下的变形进行了细致分析，结果显示其带宽稳定、带外辐射抑制效果良好，且比吸收率（SAR）值较低。为验证该方法，制作了天线原型，并分别在自由空间和贴合弯曲人体组织的状态下进行测试。结果表明，该天线的带宽为2.7 GHz至3 GHz，带外辐射抑制超过11 dB，最大抑制达23 dB，平均增益为8.5 dBi。作为一款兼具稳定性能与集成可靠滤波特性的柔性可穿戴天线，它具备柔性可穿戴结构、稳定滤波性能、轻量化特征及低SAR等多项优势，使其成为可穿戴物联网应用的理想候选。
英文摘要
In this article, a flexible and lightweight filtering wearable antenna without extra circuits is presented. The proposed antenna starts from a flexible directional antenna with lightweight structure, which includes a layer of ultra-thin flexible substrate, a metal ground layer, and a flexible foam layer sandwiched between them. Then, by introducing two pairs of vertical slots to the radiation patch printed on the flexible substrate, two radiation nulls are realized at both band edges without extra circuits. Moreover, to mitigate the deterioration of in-band radiation under different curvature, a pair of inverted Fshaped slots are loaded on the radiation patch. The coupling of Fshaped slots suppresses non-radiated lateral current components along the curvature direction, maintaining stable performance after bending. In addition, deformation analysis of the proposed antenna with a three-layer human tissue model under different bending radii is carefully carried out, showing stable bandwidth, effective out-of-band radiation suppression, and low specific absorption rate (SAR) value. To verify this method, a prototype is fabricated. Measurements are conducted both in free space and conformal on the curved body tissue. The results show that the proposed antenna achieves a bandwidth from 2.7 GHz to 3 GHz, an out-of-band radiation suppression more than 11 dB with maxmium suppression of 23 dB, and an average gain of 8.5 dBi. As a flexible wearable antenna with stable performance and integrated reliable filtering features, it has several advantages including flexible wearable structure, stable filtering properties, lightweight characteristic, and low SAR. This makes it an excellent candidate for wearable IoT applications.
