Textile materials for the design of wearable antennas: a survey.
Textile materials for the design of wearable antennas: a survey.
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DOI：
10.3390/s121115841
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发表时间：
2012-11-15
期刊：
影响因子：
--
通讯作者：
Pinho P
中科院分区：
文献类型：
--
作者：
Salvado R;Loss C;Gonçalves R;Pinho P
在用于医疗保健和普遍应用的无线身体传感器网络的广泛背景下，可穿戴天线的设计提供了无处不在的监控、通信以及能量收集和存储的可能性。可穿戴天线的具体要求是平面结构和柔性结构材料。材料的一些特性会影响天线的行为。例如，平面微带天线的带宽和效率主要由基板的介电常数和厚度决定。在可穿戴天线中使用纺织品需要对其性能进行表征。市场上有特定的导电纺织品，并已成功使用。普通纺织面料已被用作基材。然而，关于普通纺织品的电磁特性的信息很少。因此本文主要对普通织物的介电性能进行分析。一般来说，纺织品具有非常低的介电常数，可以减少表面波损耗并增加天线的阻抗带宽。然而，纺织材料不断与周围环境交换水分子，这会影响其电磁性能。此外，纺织织物是多孔、各向异性和可压缩材料，其厚度和密度可能会随着低压而变化。因此，了解这些特性如何影响天线的行为以最大限度地减少不必要的影响非常重要。本文概述了纺织天线设计和开发的关键点，从纺织材料的选择到天线的框架。还对所使用的纺织材料进行了分析。
In the broad context of Wireless Body Sensor Networks for healthcare and pervasive applications, the design of wearable antennas offers the possibility of ubiquitous monitoring, communication and energy harvesting and storage. Specific requirements for wearable antennas are a planar structure and flexible construction materials. Several properties of the materials influence the behaviour of the antenna. For instance, the bandwidth and the efficiency of a planar microstrip antenna are mainly determined by the permittivity and the thickness of the substrate. The use of textiles in wearable antennas requires the characterization of their properties. Specific electrical conductive textiles are available on the market and have been successfully used. Ordinary textile fabrics have been used as substrates. However, little information can be found on the electromagnetic properties of regular textiles. Therefore this paper is mainly focused on the analysis of the dielectric properties of normal fabrics. In general, textiles present a very low dielectric constant that reduces the surface wave losses and increases the impedance bandwidth of the antenna. However, textile materials are constantly exchanging water molecules with the surroundings, which affects their electromagnetic properties. In addition, textile fabrics are porous, anisotropic and compressible materials whose thickness and density might change with low pressures. Therefore it is important to know how these characteristics influence the behaviour of the antenna in order to minimize unwanted effects. This paper presents a survey of the key points for the design and development of textile antennas, from the choice of the textile materials to the framing of the antenna. An analysis of the textile materials that have been used is also presented.
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