Table of Contents
International Journal of Microwave Science and Technology
Volume 2012, Article ID 375601, 7 pages
Research Article

Complex Permittivity Measurements of Textiles and Leather in a Free Space: An Angular-Invariant Approach

Department Electrical and Electronics Engineering, Ariel University Center of Samaria, Ariel 40700, Israel

Received 5 March 2012; Accepted 15 May 2012

Academic Editor: Andrea Randazzo

Copyright © 2012 B. Kapilevich et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper describes the complex permittivity measurements of textiles and leathers in a free space at 330 GHz. The destructive role of the Rayleigh scattering effect is considered and the angular-invariant limit for an incidence angle has been found out experimentally within 25–30 degrees. If incidence angle exceeds this critical parameter, the uncertainty caused by the Rayleigh scattering is drastically increased preventing accurate measurements of the real and imaginary parts of a bulky material. The phenomenon must be taken into consideration in predicting shielding effectiveness of materials covering hidden object in concealed threat detection with millimeter-wave radar systems.