The Characterization of Conductive Textile Materials Intended for Radio Frequency Applications
The Characterization of Conductive Textile Materials Intended for Radio Frequency Applications
复制标题
用于射频应用的导电纺织材料的表征
DOI：
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发表时间：
2007
影响因子：
3.5
通讯作者：
A. Gavrin
中科院分区：
文献类型：
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作者：
R. Shaw;B. Long;D. Werner;A. Gavrin
通过标准的纺织制造技术，部分由导电纺织材料（也称为电子纺织品）构成的天线目前正受到天线理论家和天线制造商的越来越多的关注。然而，主要由于采用了独特的制造方法，这些新材料不能被视为更传统的金属天线的简单等效替代品。导电纱线的导电性可能远低于理想水平，而且它们的内部结构不均匀，其特征相对于蒙皮深度较小，因此很难直接根据导电材料的体积电阻率进行分析。此外，缝纫或编织导电纺织纱线的波动和有时非平面性质引入了必须适当考虑的重要相位延迟。本文描述了一种确定电导率的方法，sigma，它准确地代表了具有与实际导电纱相同半径的MoM段的有损耗非均匀纺织导体。这个方法有三个步骤。首先，在传输在线测试单元中，通过实验确定纺织导体单位长度的电阻。接下来，对单位长度的测量电阻进行调整，以考虑跨多个纱线导体的不均匀电流分布。最后，采用表面阻抗公式推导出等效的毫微米段体电导率，该电导率准确地表示被测导体的性能。过量的相位延迟，固有的纺织导体，是通过检查测试单元散射参数的相位分量，S21确定的。
Antennas constructed in part from conductive textile materials (also known as e-textiles) by means of standard textile manufacturing techniques are currently receiving increasing attention from antenna theorists and antenna manufacturers alike. However, due mostly to the unique fabrication methods employed, these novel materials cannot be treated as simple, equivalent substitutes for the more-conventional metallic antennas. Conductive yarns can have considerably less-than-ideal conductivity, and their inhomogeneous internal structure, with features small with respect to the skin depth, can be difficult to analyze directly in terms of conductive-material bulk resistivity. Furthermore, the undulating and sometimes non-planar nature of stitched or woven conductive textile yarns introduces a significant phase delay that must be properly taken into account. This article describes a method to determine the conductivity, sigma , which accurately represents a lossy inhomogeneous textile conductor for a MoM segment having the same radius as the actual conductive yarn. This method has three steps. First, the resistance per unit length of the textile conductor is determined experimentally, in a transmission-line test cell. Next, this measured resistance per unit length is adjusted to account for the nonuniform current distribution across the multiple yarn conductors. Finally, a surface-impedance formulation is employed to derive an equivalent MoM-segment bulk conductivity that accurately represents the measured conductor's performance. Excess phase delay, inherent in textile conductors, is determined by examination of the phase component of the test cell scattering parameter, S21.