Near-End and Far-End Coupling Investigations of Conductive Fiber Transmission Lines (TLs) on an Ultrathin Denim Substrate

İFTİKHAR A., Naseer N., GÖKCEN D., SAKA TANATAR B., Shafique M. F.

7th International Electromagnetic Compatibility Conference, EMC Turkiye 2023, İstanbul, Turkey, 17 - 20 September 2023 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/emcturkiye59424.2023.10287525
  • City: İstanbul
  • Country: Turkey
  • Keywords: Conductive fabric-based, far-end coupling, feed network, near-end coupling, transmission lines, wave propagation
  • Hacettepe University Affiliated: Yes


An experimental validation is carried out in this research to investigate the potential uses of a conductive fabric as a Transmission Line (TL) for the feed networks of wearable antenna arrays utilized in biomedical wearable applications. Initially, a 50Ω conductive fabric microstrip transmission line with a 100 mm length was manufactured on a 0.7 mm denim substrate. The wave propagation properties of the prototype were measured and compared to the propagation properties of an ideal copper-based 50 Ω TL. The results showed that conductive fabric-based TL supports wave propagation properties similar to that of copper-based TL from 500 MHz - 10 GHz. However, conductive fabric-based TL experiences losses at higher frequencies due to lower conductivity and large surface roughness. Afterward, for the undesired mutual coupling investigations in the feed network, a parallel TL with a separation of 6.0 mm was then manufactured and tested. Overall, the near-end and far-end coupling investigations show that coupled conductive fabric-based TLs provide isolation in a manner similar to that of ideal copper-based TL. The results also show that conductive fabric-based TL is more immune to coupling at high frequencies thus useful for most demanding conformal applications.