Measurement and Performance of Textile Antenna Efficiency on a Human Body in a Reverberation Chamber
Measurement and Performance of Textile Antenna Efficiency on a Human Body in a Reverberation Chamber
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DOI：
10.1109/tap.2012.2225817
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发表时间：
2013-02-01
影响因子：
5.7
通讯作者：
Khiabani, Neda
中科院分区：
文献类型：
--
作者：
Boyes, Stephen J.;Soh, Ping Jack;Khiabani, Neda
随着近年来体内通信研究的到来，为了成功地集成到人体对象上，对满足广泛标准(其中一个是最小效率退化)的天线的开发需求越来越大，其中一个很有前途的开发是纺织天线。本文利用混响室研究了几种新设计的小型纺织天线在活体人体上的效率性能。首先，我们证明了这些纺织天线的材料选择对机身频率失谐和效率水平有至关重要的影响，因为通过比较，我们确定了在自由空间中有损耗的纺织天线在放置在机身上时实际上可以比更高自由空间效率的纺织天线性能更好。这对这些小尺寸天线的材料设计选择产生了深远的影响。其次，我们研究了弯曲条件下的性能影响，最后我们表明，纺织天线的整体性能可以通过改变身体与人体的距离而有所缓解。结果表明，在某些情况下，离物体20 mm的距离就足以使辐射效率接近自由空间水平。文中给出了理论、仿真和实验的证据来验证结论。
With the advent of on-body communication research in recent years, there is a growing need for antenna developments that satisfy a wide criteria (one being minimal efficiency degradation) in order to be integrated successfully onto human subjects; one promising development is the textile antenna. In this paper we investigate the efficiency performance of some newly designed small sized textile antennas on live human subjects using a reverberation chamber. First, we show that the material selection of these textile antennas can have a crucial effect on the on-body frequency detuning and efficiency levels, as via a comparison we determine that a lossier textile antenna in free space can actually outperform a higher free space efficient textile antenna when placed on-body. This has a profound impact on the material design choices for these small sized antennas. Second, we investigate the performance effects under bent conditions and finally we show that the overall performance of the textile antenna can be mitigated somewhat by variations in on-body distances from the human subject. It is revealed that in some cases a small 20 mm distance from the body is sufficient for the radiation efficiency to approach the free space levels. Theoretical, simulated and experimental evidence is presented to verify the conclusions.