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High Frequency Dielectric Permittivity of Nonwovens

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Authors:

  • Hausman Sławomir
    Institute of Electronics, Lodz University of Technology, Łódź, Poland
  • Januszkiewicz Łukasz (j/w)
  • Michalak Marina
    Department of Fibre Physics and Textile Metrology, Faculty of Material Technologies and Textile Design, Technical University of Łódź, Łódź, Poland
  • Kacprzak Tomasz
    Institute of Electronics, Lodz University of Technology, Łódź, Poland
  • Krucińska Izabella
    Department of Fibre Physics and Textile Metrology, Faculty of Material Technologies and Textile Design, Technical University of Łódź, Łódź, Poland

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Abstract:

In this paper, selected direct-current and high-frequency properties of dielectric textile materials for application to textronics are presented. Textronics deals, among other matters, with designing and manufacturing devices which are at the boundaries of electronic and textile science and technology. Textronic materials may be applied to accomplish the wireless transmission of signals between various subsystems integrated into textile products, or transmission to systems in the user’s environment. This research concentrates on nonwoven textile materials for applications where the need exists to integrate antenna systems with textile products. Body-worn antenna systems embedded in clothes provide the greatest degree of integration of the electronic and textile parts into a textronic product. To design such antennas, a knowledge of nonwovens’ high frequency electrical parameters is required, namely the complex dielectric permittivity of textile materials. In this paper, we present the measurement results of dielectric permittivity as well as the through-resistance and surface resistance for several samples of nonwovens. The knowledge of these parameters’ values is required to design textile antennas and their supply systems. The measurements were carried out for some variants of stitched nonwovens manufactured with the use of various raw materials, maintaining the same technological parameters. The particular variants of nonwovens were manufactured from fibres with typical properties for common applications and for slow-burning fibres.

Tags:

dielectric textile materials, nonvovers, high ferquency dielectric permittivity, surface resistance, through resistance, textronic materials, wireless signal transmission, antenna

Published in issue no 5 (59) / 2006, pages 60–63.

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