A hybrid resonant/transmission reflection method to determine the dielectric permittivity of materials is presented. The measurement procedure is based on the use of a low cost frequency selective filter transversally placed in a waveguide in the proximity of the unknown sample. The frequency selective surface and the dielectric sample constitute a resonant structure. As the dielectric permittivity of the sample is increased, the resonance frequencies of the transmission (or reflection) coefficient of the FSS are shifted. The relationship between the frequency shift and the permittivity of the dielectric under test allows the determination of the permittivity of the sample. Such procedure is particularly suitable for measuring the dielectric permittivity of thin slabs.
Dielectric permittivity measurement technique based on waveguide FSS filters / F. Costa, A. Monorchio, C. Amabile, E. Prati - In: European Microwave Week 2011: "Wave to the Future"[s.l] : EuMC, 2011. - ISBN 9782874870224. - pp. 945-948 (( Intervento presentato al 41. convegno European Microwave Week 2011: "Wave to the Future, 41st European Microwave Conference tenutosi a Manchester nel 2011.
Dielectric permittivity measurement technique based on waveguide FSS filters
E. PratiUltimo
2011
Abstract
A hybrid resonant/transmission reflection method to determine the dielectric permittivity of materials is presented. The measurement procedure is based on the use of a low cost frequency selective filter transversally placed in a waveguide in the proximity of the unknown sample. The frequency selective surface and the dielectric sample constitute a resonant structure. As the dielectric permittivity of the sample is increased, the resonance frequencies of the transmission (or reflection) coefficient of the FSS are shifted. The relationship between the frequency shift and the permittivity of the dielectric under test allows the determination of the permittivity of the sample. Such procedure is particularly suitable for measuring the dielectric permittivity of thin slabs.Pubblicazioni consigliate
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