In this article, we present a dual-ID radio frequency identification (RFID) headgear based on quasi-Yagi antenna where we reuse the reflector element as the second dipole antenna that provides radiation pattern upward from the user's head. Thus, we achieve simultaneously the broadside and endfire patterns without increasing the size of the antenna platform. For avoiding the unpredictable impact of the surface of the human body to the electromagnetic properties of the antenna platform, we inserted a periodic surface made up of a 2-by-2 grid of square loops beneath it. It facilitates launching of surface waves thereby enhancing the endfire radiation for the quasi-Yagi antenna and its back metal plate isolates the antenna platform from the human body. We have fitted the whole structure on the headgear by folding the quasi-Yagi antenna elements and created the antenna on a low-permittivity textile substrate. Moreover, we have modeled the antenna in both simple and anatomical head models, both including curvature, and measured the attainable read ranges of 6.8 m and 5 m, for the quasi-Yagi and dipole tags, respectively, in head-worn configuration.

中文翻译：

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基于准八木和偶极天线的头戴式双 ID RFID 标签

在本文中，我们展示了一种基于准八木天线的双 ID 射频识别 (RFID) 头饰，我们将反射器元件重新用作第二个偶极天线，从用户头部向上提供辐射图。因此，我们在不增加天线平台尺寸的情况下同时实现了侧射和端射方向图。为了避免人体表面对天线平台的电磁特性产生不可预测的影响，我们在其下方插入了一个由 2×2 方环网格组成的周期性表面。它有助于发射表面波，从而增强准八木天线的端射辐射，其背面金属板将天线平台与人体隔离。我们通过折叠准八木天线元件将整个结构安装在头饰上，并在低介电常数纺织基板上制作天线。此外，我们在简单和解剖头部模型中对天线进行了建模，两者都包括曲率，并测量了准八木和偶极子标签在头戴式配置中的可达到的读取范围分别为 6.8 m 和 5 m。