Performance of a radiation pattern steering on-body gateway antenna for on-body and off-body propagation

2015 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS) Pub Date : 2015-07-09 DOI:10.1109/BIOWIRELESS.2015.7152112

S. Dumanli

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引用次数: 1

Abstract

Antennas in Body Area Networks (BAN) should be designed according to the link they are expected to form. In most of the systems, an on-body gateway collects data frames from other on-body sensors and relays them to an off-body gateway, realizing two different modes of operation, on-body and off-body. For such a device, the on-body link and the off-body link have different radiation pattern requirements. Moreover the antenna should be designed taking the effects of human body being in the nearfield of the antenna on the performance into account. A planar antenna operating in the 2.4 GHz ISM band which can satisfy all requirements by radiation pattern steering with frequency is analysed here in terms of its on-body and off-body propagation performance. Analysis were performed through simulations featuring two layered numerical chest phantoms, one being cylindrical and one being flat. The effects of the antenna - body spacing are investigated through the flat phantom while the on-body and off-body propagation are investigated through the cylindrical phantom. The antenna is shown to be performing well upto 5 mm spacing. It has been proved that the antenna provides 9 dB advantage in average for the on-body link compared to the case where its off-body radiation mode is used to connect to the on-body sensor and vice versa.

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辐射方向转向体上网关天线的体上和体外传播性能

体域网络(BAN)中的天线应根据其预期形成的链路进行设计。在大多数系统中，身体上的网关从其他身体上的传感器收集数据帧，并将其转发给身体外的网关，实现两种不同的运行模式，身体上和身体外。对于这种装置，体上链路和体外链路具有不同的辐射方向图要求。此外，在设计天线时还应考虑人体在天线近场位置对天线性能的影响。分析了一种工作在2.4 GHz ISM频段的平面天线的体上和体外传播性能，该天线可以满足辐射方向图随频率转向的所有要求。通过模拟两层数值胸影进行分析，一层为圆柱形，一层为平面。通过平面模体研究了天线体间距的影响，通过圆柱模体研究了体上和体外传播。天线在5毫米的间距内表现良好。事实证明，与使用其离体辐射模式连接到体上传感器的情况相比，该天线为体上链路提供了平均9db的优势，反之亦然。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2015 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)

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