Reflecting and Polarizing Properties of Conductive Fabrics in Ultra-High Frequency Range

  • Oleg Kiprijanovič Center for Physical Sciences and Technology, A.Goštauto 11, Vilnius LT-01108, Lithuania
  • Steponas Ašmontas Center for Physical Sciences and Technology, A.Goštauto 11, Vilnius LT-01108, Lithuania
  • Jonas Matuzas Center for Physical Sciences and Technology, A.Goštauto 11, Vilnius LT-01108, Lithuania
  • Lina Valasevičiūtė Center for Physical Sciences and Technology, Demokratų g. 53, LT-48485, Kaunas Lithuania
  • Sandra Varnaitė-Žuravliova Center for Physical Sciences and Technology, Demokratų g. 53, LT-48485, Kaunas Lithuania
Keywords: EM background, compact systems based on UWB EM pulses, wideband antennas, UWB signals, conductive fabrics

Abstract

The system based on ultra-wide band (UWB) signals was employed for qualitative estimation of attenuating, reflecting and polarizing properties of conductive fabrics, capable to prevent local static charge accumulation. Pulsed excitation of triangle monopole antenna of 6.5 cm height by rectangular electric pulses induced radiation of UWB signals with spectral density of power having maximum in ultra-high frequency (UHF) range. The same antenna was used for the radiated signal receiving. Filters and amplifiers of different passband were employed to divide UHF range into subranges of 0.3-0.55 GHz, 0.55-1 GHz, 1-2 GHz and 2-4 GHz bands. The free space method, when conductive fabric samples of 50x50 cm2 were placed between transmitting and receiving antennas, was used to imitate a practical application. Received wideband signals corresponding to the defined range were detected by unbiased detectors. The fabrics made of two types of warps, containing different threads with conductive yarns, were investigated. It was estimated attenuation and reflective properties of the fabrics when electric field is collinear or perpendicular to thread direction. In the UHF range it was revealed good reflecting properties of the fabrics containing metallic component in the threads. The system has advantages but not without a certain shortcoming. Adapting it for specific tasks should lead to more effective usage, including yet unused properties of the UWB signals.

Published
2015-07-29
Section
TEXTILE MATERIALS