Radiation Pattern Analysis of Single and Multi-Antenna Wearable Systems
Radiation Pattern Analysis of Single and Multi-Antenna Wearable Systems
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DOI：
10.1109/vtcfall.2016.7881186
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
M. Abdullah;Xenofon Fafoutis;M. Klemm;G. Hilton
中科院分区：
文献类型：
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作者：
M. Abdullah;Xenofon Fafoutis;M. Klemm;G. Hilton
本文介绍了3D辐射模式分析全向（偶极子）和定向（贴片）天线的各种身体位置，包括手腕方向和胸部位置时，安装在人体模型。除了分析不同体位在2.44GHz的方向性和相对效率外，该研究还考虑了辐射模式的扇区和切片分析。在扇区分析中，对12个方位角-仰角扇区的方向性进行平均，而在切片分析中，对整个仰角上的28个方位角扇区的方向性进行平均。它示出，由于身体阻塞的天线效率可以低至23%，相对于胸部位置的效率，和方向性的范围从5.4到10.5dBi的天线在不同的方向。扇形分析识别最高平均信号电平，其对于偶极子在桌子和门高度之间，对于贴片在门高度以上。切片分析不考虑接入点或用户高度，显示偶极天线和贴片天线的平均方向性分别在5.1和4.4dBi处达到峰值。使用这些天线作为开关分集系统的一部分将在低信号电平的区域中将平均方向性提高约7 dBi，因此对于腕带和智能服装可能有用。
This paper presents 3D radiation pattern analyses for omnidirectional (dipole) and directional (patch) antennas for various body locations encompassing wrist orientations and chest positions when mounted on a body phantom. In addition to analysing the directivities and relative efficiencies at 2.44GHz for different body positions, the study considers Sector and Slice analysis of the radiation patterns. In Sector analysis, the directivity is averaged for 12 azimuth-elevation sectors, while in Slice analysis, it is averaged for 28 azimuth sectors over the full elevation. It is shown that the antenna efficiency due to body blockage can be as low as 23% relative to the chest position efficiency, and directivities ranges from 5.4 to 10.5dBi for the antennas at different orientations. The Sector analysis identifies highest average signal levels, which are between table and door height for the dipole and above door height for the patch. The Slice analysis, which doesn't account for access point or user heights, shows average directivities that peak at 5.1 and 4.4dBi for the dipole and patch antenna, respectively. Using these antennas as part of a switch diversity system would improve the average directivity by approximately 7dBi in regions of low signal levels, and hence are potentially useful for wristbands and smart clothing.