A wearable all-textile microstrip patch antenna (MPA) operating in the dual bands of medical body area network (2.36–2.40 GHz) and WiMAX (3.4–3.6 GHz), is proposed for body-centric communications. The omnidirectional radiation pattern with linear polarization for on-body link and unidirectional radiation pattern with circular polarization for off-body link are achieved by introducing reactance loading into MPA. Notably, two pairs of shorting pins are employed to tune the TM10 mode of MPA and generate a new mode of TM00, and by adjusting the spacing and radii of shorting pins, the required dual-band and dual-mode operation is achieved. Moreover, due to the adoption of textile (i.e., wool felt) as substrate and nylon conductive fabric as conductor, the antenna is flexible, totally conforming to the human body. The proposed MPA, with the dimensions of 70 mm × 70 mm × 2 mm (0.56λ0 × 0.56λ0 × 0.016λ0 at 2.38 GHz), was fabricated and characterized. The measured results show that the reflection coefficient, radiation pattern, and gain of the antenna are slightly affected by structural deformation and human body loading. With merit characteristics, the proposed design can be well applied to wearable medical applications.

中文翻译：

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用于身体和离体通信的可穿戴双频和双极化纺织天线

建议在医疗体域网 (2.36–2.40 GHz) 和 WiMAX (3.4–3.6 GHz) 双频段工作的可穿戴全纺织微带贴片天线 (MPA) 用于以身体为中心的通信。通过在 MPA 中引入电抗负载，可实现体上链路的线极化全向辐射方向图和离体链路的圆极化单向辐射方向图。值得注意的是，采用两对短路引脚来调整MPA的TM10模式并生成新的TM00模式，并通过调整短路引脚的间距和半径来实现所需的双频双模操作。此外，由于采用纺织品（即羊毛毡）为基材，尼龙导电织物为导体，天线具有柔性，完全贴合人体。拟议的海洋保护区，制造和表征尺寸为 70 mm × 70 mm × 2 mm（0.56λ0 × 0.56λ0 × 0.016λ0 在 2.38 GHz）。实测结果表明，天线的反射系数、辐射方向图和增益受结构变形和人体载荷的影响较小。凭借优异的特性，所提出的设计可以很好地应用于可穿戴医疗应用。