The two-point target technique for free-space permittivity measurements of lossy dielectrics

1994 ◽  
Vol 7 (11) ◽  
pp. 501-505 ◽  
Author(s):  
Hongcheng Yin ◽  
Wenxun Zhang ◽  
Zhihe Xiao ◽  
Peikang Huang
Keyword(s):  
Free Space ◽  
Point Target ◽  
Lossy Dielectrics ◽  
Permittivity Measurements

scholarly journals $W$ -Band Complex Permittivity Measurements at High Temperature Using Free-Space Methods

2019 ◽  
Vol 9 (6) ◽  
pp. 1011-1019 ◽  
Author(s):  
Martin S. Hilario ◽  
Brad W. Hoff ◽  
Benmaan Jawdat ◽  
Michael T. Lanagan ◽  
Zane W. Cohick ◽  
...  
Keyword(s):  
High Temperature ◽  
Complex Permittivity ◽  
Free Space ◽  
W Band ◽  
Permittivity Measurements

Grain permittivity measurements in free space

1995 ◽  
Author(s):  
A W Kraszewski ◽  
S Trabelsi ◽  
S O Nelson
Keyword(s):  
Free Space ◽  
Permittivity Measurements

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

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
B. Kapilevich ◽  
B. Litvak ◽  
M. Anisimov ◽  
D. Hardon ◽  
Y. Pinhasi
Keyword(s):  
Complex Permittivity ◽  
Free Space ◽  
Rayleigh Scattering ◽  
Incidence Angle ◽  
Shielding Effectiveness ◽  
Millimeter Wave Radar ◽  
Radar Systems ◽  
Wave Radar ◽  
Permittivity Measurements

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.

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