Title :
Microwave techniques for measurement of radar absorbing materials-a review
Author :
Maze-Merceur, G. ; Bonnefoy, J.-L. ; Garat, J. ; Mittra, R.
Author_Institution :
CEA-CESTA, Le Barp, France
Abstract :
Summary form only given. The transmission line approach, used in conjunction with a network analyzer to measure the complex values of epsilon and mu of homogeneous as well as heterogeneous, but isotropic and thick samples, was described. For biaxial samples, a method that uses a guided-wave structure with a preferential axis, such as coaxial line or a waveguide of rectangular cross-section, was presented. The problem of measuring the permeability of anisotropic thin films by using a loop, the extraction of mu from the knowledge of the flux variation, and the validation of these results by comparison with theoretical values of mu vs. frequency that can be computed from the static measurements was addressed. The single frequency measurement techniques, based on the cavity resonance perturbation approach, for accurate characterization of small samples were discussed. Free space techniques that are useful for the measurement of anisotropic and heterogeneous materials were described. Typically, free-space measurements are carried out in anechoic chambers, involve both the reflection and transmission measurements, and yield information on absorption and surface impedance characteristics of the sample. This information is useful for designing the shape as well as the coating of complex targets with a view to reducing their radar cross section.<>
Keywords :
magnetic permeability measurement; microwave measurement; permittivity measurement; radar cross-sections; anisotropic thin films; biaxial samples; cavity resonance perturbation approach; coaxial line; complex targets; free-space measurements; guided-wave structure; heterogeneous materials; homogeneous samples; isotropic samples; microwave measurement techniques; network analyzer; permeability; permittivity; radar absorbing materials; radar cross section; surface impedance; transmission line approach; transmission measurements; waveguide; Anisotropic magnetoresistance; Coaxial components; Frequency measurement; Impedance measurement; Microwave measurements; Microwave theory and techniques; Radar measurements; Thickness measurement; Transmission line measurements; Transmission line theory;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221408