A set of methods for measure complex dielectric permittivity of layer materials at microwaves is suggested. These methods allow one to measure dielectric permittivity of composite materials in with the mean size of inhomogeneities is comparable with the wavelength and materials with high dielectric permittivity.
Filled polymers containing conductive inclusions possess a number of unique microwave properties. The effective values of real ε1 and imaginary ε2 parts of complex dielectric permittivity ε=ε1 + εz of these materials may be easily changed by variation of their composition. The values of ε1 may have high (up to several hundreds) as well as negative meanings [1]. Besides, the filled polymers containing conductive inclusions may possess strong frequency dispersion of the effective dielectric permittivity at wavelengths λ∼1, where 1 is a size of inclusion. The investigation of dielectric properties of these materials at microwaves is of great interest as from the physical point of view as for technical applications.
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