In the article, a new method for the estimation of electric permittivity of threads (filaments) was presented. The proposed recursive method is based on the results of computer simulation of 3D model of transmission stripline. This model contains a model of flat fabric having threads, with which electric permittivity should be determined. The described procedure uses the method proposed by Barry to obtain permittivity of flat fabric from the so-called s parameters of the simulated stripline. In the proposed method, the permittivity of the flat fabric obtained from simulation is compared with the measured value of permittivity of real flat fabric in order to estimate the threads’ permittivity. This comparison is needed to obtain the electric permittivity of threads forming this fabric. The article also presents examples of the obtained values of threads’ permittivity and discussion about the accuracy of the method. The presented method will be useful in situations where the knowledge of permittivity of threads is necessary in the conducted research.
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 Roshni S. B. et al. (2017). Design and fabrication of an E-shaped wearable textile antenna on PVB-coated hydrophobic polyester fabric Smart Mater. Struct. 26 1 - 8.
 Leśnikowski J. (2015). New Kind of Textile Transmission Line with an Impedance of 50 Ohms. Fibres & Textiles in Eastern Europe 23(2) 51-54.
 Leśnikowski J. (2011). Textile Transmission Lines in the Modern Textronic Clothes FIBRES & TEXTILES in Eastern Europe 19(6) 89-93.
 Zhou G. et al. (2017). Highly Sensitive Wearable Textile-Based Humidity Sensor Made of High-Strength Single-Walled Carbon Nanotube/Poly(vinyl alcohol) Filaments ACS Appl. Mater. Interfaces9(5) 4788–4797.
 Kubiak P. Leśnikowski J. Gniotek K. (2016). Textile Sweat Sensor for Underwear Convenience Measurement. Fibres & Textiles in Eastern Europe 24(6)151-155.
 Kurczewska A. Leśnikowski J. (2008). Variable-thermoinsulation garments with a microprocessor temperature controller International Journal of Occupational Safety and Ergonomics 14 (1) 77-87.
 Zhang H. Zeng B.Q. Ao L. & Zhang Z. (2012). A novel dual-loop coupler for one-port Cylindrical cavity permittivity measurement Progress in Electromagnetics Research 127 537-552.
 Bappadittya R. Bhatterchya A.K. & Choudhury S. K. (2013 December). Characterization of Textile Substrate to Design a Textile Antenna Paper presented at the International Conference on Microwave and Photonics (ICMAP) Dhanbad India.
 Leśnikowski J. (2012). Dielectric permittivity measurement methods of textile substrate of textile transmission lines Electrical Review 3a 148-151.
 Bal K. & Kothari V.K. (2009). Measurement of dielectric properties of textile materials and their applications Indian Journal of Fibre & Textile Research 34 191-199.
 Kumar A. & Sharma S. (2007). Measurement of dielectric constant and measurement of dielectric constant and loss factor of the dielectric material at microwave frequencies Progress In Electromagnetics Research PIER 69 47–54.
 Bal K. & Kothari V.K. (2009). Study of dielectric behavior of woven fabric based on two phase models Journal of Electrostatics 67 751-758.
 ASTM D 150-11. (2011). Standard test methods for a-c loss characteristics and permittivity (dielectric constant) of solid electrical insulation. Retrieved February 02 2016 from http://www.astm.org/Standards/D150.htm
 Radmanesh M. (2007). RF & Microwave Design Essentials: Engineering Design and Analysis from DC to Microwaves. Bloomington: Author House.
 Hiebel M. (2007). Fundamentals of Vector Network Analysis. Munich: Rohde-Schwarz.
 Ellinger F. (2007). Radio Frequency Integrated Circuits and Technologies. Berlin Heidelberg: Springer.
 Barry W. (1986). A Broad-Band Automated Strip line Technique for the Simultaneous Measurement of Complex Permittivity and Permeability IEEE Transactions on Microwave Theory and Techniques MTT34 1 80-84.
 Collin R. E. (1960). Field Theory of Guided Waves. New York: McGraw-Hill 3 79-83.
 Tokarska M. Gniotek K. 2015. Anisotropy of the electrical properties of flat textiles The Journal of The Textile Institute 106(1) 9-18.
 Sheen J. (2007). Amendment of cavity perturbation technique for loss tangent measurement at microwave frequencies Journal of Applied Physics 102 014102-1 - 014102-6.
 IEC 250:1969 Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power audio and radio frequencies including meter wavelengths. Retrieved February 02 2016 from https://webstore.iec.ch/publication/1151&preview=1