Over the last decade, the wearable electronics has greatly improved and the wearables market is expected to increase exponentially in the next years. UHF (Ultra High Frequencies) RFID (Radio Frequency IDentification) textile yarns represent one of the most relevant solutions for adding smart functionality into clothes and more generally for any object integrating a textile tag. Among the existing textile yarn solutions, the E-Thread® technology consists on electronics embedded into textile yarn using a micro-encapsulation method. This technology is the starting point of the work presented in this paper. One of the hardest constraints that the RFID yarn should overcome is the robustness against stretching. Thus, the antenna has to be tolerant to the deformation of the associated textile yarn. Unlike the half-wave dipole antenna used in the current E-Thread® yarn, the proposed solution is based on helical dipole antenna topology because its geometry naturally makes feasible an axial stretching. This study details the manufacturing process as well as the design methodology of the antenna taking into account the RFID context as well as the constraints imposed by the manufacturing process. The impact of the antenna's physical parameters is highlighted in order to provide design guidelines. The helical dipole antenna enables until 16% of axial elongation while the dipole antenna would tear apart.

中文翻译：

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UHF RFID弹性纺织纱线

在过去十年中，可穿戴电子产品有了很大改进，预计未来几年可穿戴设备市场将呈指数级增长。UHF（超高频）RFID（射频识别）纺织纱线代表了最相关的解决方案之一，可将智能功能添加到衣服中，更普遍地适用于任何集成了纺织标签的物体。在现有的纺织纱线解决方案中，E-Thread® 技术包括使用微封装方法嵌入纺织纱线中的电子设备。这项技术是本文提出的工作的起点。RFID 纱线应克服的最困难的限制之一是抗拉伸性。因此，天线必须能够承受相关纺织纱线的变形。与当前 E-Thread® 纱线中使用的半波偶极子天线不同，所提出的解决方案基于螺旋偶极子天线拓扑结构，因为其几何形状自然使轴向拉伸成为可能。本研究详细介绍了天线的制造过程以及设计方法，同时考虑了 RFID 环境以及制造过程施加的限制。突出显示了天线物理参数的影响，以提供设计指南。螺旋偶极子天线可实现 16% 的轴向伸长，而偶极子天线会撕裂。本研究详细介绍了天线的制造过程以及设计方法，同时考虑了 RFID 环境以及制造过程施加的限制。突出显示了天线物理参数的影响，以提供设计指南。螺旋偶极子天线可实现 16% 的轴向伸长，而偶极子天线会撕裂。本研究详细介绍了天线的制造过程以及设计方法，同时考虑了 RFID 环境以及制造过程施加的限制。突出显示了天线物理参数的影响，以提供设计指南。螺旋偶极子天线可实现 16% 的轴向伸长，而偶极子天线会撕裂。