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