Complex permittivity measurements with a low cost parabolic resonant cavity

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Abstract

A low-cost Fabry Perot open resonator is used to measure the complex permittivity of flat sheets of dielectric materials in the X-band. The method is based on the measurement of the resonant frequency shift of the fundamental mode, described by the Gaussian beam theory. Instead of spherical mirrors, conventionally used for open resonators, the cavity is formed by parabolic reflectors, originally intended for satellite communications, reducing the production costs. A technique to improve the sample alignment is introduced, and to validate the results of the parabolic cavity, the relative permittivity and loss tangent of three different samples are measured.
Original languageEnglish
Title of host publicationProceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018)
PublisherInstitution of Engineering and Technology (IET)
Number of pages6
ISBN (Electronic)978-1-78561-969-4
DOIs
Publication statusPublished - 18 Feb 2019
EventLoughborough Antennas and Propagation Conference 2018, LAPC 2018 - Loughborough, United Kingdom
Duration: 12 Nov 201813 Nov 2018

Conference

ConferenceLoughborough Antennas and Propagation Conference 2018, LAPC 2018
Abbreviated titleLAPC
CountryUnited Kingdom
CityLoughborough
Period12/11/1813/11/18

Keywords

  • Loss tangent
  • Material characterization
  • Open resonator
  • Parabolic cavity
  • Relative permittivity

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