Antenna Parameters for On-Body Communications With Wearable and Implantable Antennas
Antenna Parameters for On-Body Communications With Wearable and Implantable Antennas
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DOI：
10.1109/tap.2021.3060944
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发表时间：
2021-09-01
影响因子：
5.7
通讯作者：
Manteuffel, Dirk
中科院分区：
文献类型：
--
作者：
Berkelmann, Lukas;Manteuffel, Dirk
在这篇文章中，重新定义的天线参数是关于发生在体内传播的额外影响的，以实现对在体内天线的标准化表征。基于诺顿表面波理论和表面等效原理，利用格林函数建立了任意可穿戴和可植入天线的在体传播模型，并将其作为在体近场到远场的变换。定义的车身远场允许重新定义车载情况下的天线参数(增益、有效面积和效率)。在此基础上，天线可以从体内信道中移除，并且可以通过与自由空间传播类似的自适应Friis传输方程来计算两个天线之间的体内链路。通过助听器天线和植入式起搏器天线的两个例子表明，体内天线参数允许对天线进行有教养的设计，而不需要对整个系统进行电磁建模。
In this article, redefined antenna parameters regarding the additional effects occurring with on-body propagation are derived to enable a standardized characterization of on-body antennas. A model for the on-body propagation of arbitrary wearable and implantable antennas using Green's functions based on the Norton surface wave theory and the surface equivalence principle is presented, which subsequently is used as an on-body near-field-to-far-field transformation. The defined on-body far-field enables the redefinition of the antenna parameters (gain, effective area, and efficiency) for the on-body case. Based thereon, the antennas can be deembedded from the on-body channel and the on-body link between two antennas can be calculated by an adapted Friis transmission equation similar to free-space propagation. It is demonstrated by two examples, one of a hearing aid antenna and another of an antenna of an implantable pacemaker, that the on-body antenna parameters allow for an educated design of the antennas without the necessity of electromagnetic modeling of the entire system.