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Noise versus coherency in mm-wave material characterization

Comparison of coherent and noise probing is described in order to formulate the criteria for characterization of materials on mm-wave and microwave frequencies. Double-layers dielectric structure having Fabry-Perot resonator properties is employed to develop accurate mathematical model and to predict transmittances for both coherent and noise illuminations. Experiments have proved the basic modeling predictions as well as the role of noise bandwidth in averaging process used in material characterizations.