Tajin Md Abu Saleh, Bshara Oday, Liu Yuqiao, Levitt Ariana, Dion Genevieve, Dandekar Kapil R
Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA 19104, USA.
Materials Science and Engineering Department, Drexel University, Philadelphia, PA 19104, USA.
IET Microw Antennas Propag. 2020 Feb;14(3):154-158. doi: 10.1049/iet-map.2019.0503. Epub 2019 Dec 11.
Flexible antennas have the potential to transform wearable and fabric-based wireless sensing technologies. The antenna discussed in this study is part of a sensing system that uses the back-scattered power level as the decision metric. For a good wireless sensor, it is necessary to offer a feasible read range and maintain good distinctions in the back-scattered power levels between the different states (i.e. level of stretch) of the antenna. Moreover, effects due to human body proximity should be minimised. For these reasons, the radiation efficiency is a crucial parameter to investigate. This study presents the radiation efficiency measurement of the proposed flexible knitted 'Bellyband' antenna at two different levels of stretch in a reverberation chamber. This work validates the reverberation chamber measurements through comparison with simulations and anechoic chamber measurements at 900 MHz. Moreover, this work demonstrates how the approach can be used to quantify bellyband antenna efficiency in the vicinity of a human body. Finally, the efficiency results were used to predict the read range of Bellyband radio frequency identification technology.
柔性天线有潜力变革可穿戴和基于织物的无线传感技术。本研究中讨论的天线是一个传感系统的一部分，该系统使用反向散射功率电平作为决策指标。对于一个良好的无线传感器而言，有必要提供一个可行的读取范围，并在天线的不同状态（即拉伸程度）之间的反向散射功率电平上保持良好的区分度。此外，应尽量减少人体靠近带来的影响。出于这些原因，辐射效率是一个关键的研究参数。本研究展示了在混响室内对所提出的柔性针织“腹带”天线在两种不同拉伸程度下的辐射效率测量。这项工作通过与900 MHz下的模拟和电波暗室测量结果进行比较，验证了混响室测量结果。此外，这项工作还展示了该方法如何用于量化人体附近腹带天线的效率。最后，利用效率结果预测了腹带射频识别技术的读取范围。
