2134/11536452.v1 Chih-Kuo Lee Chih-Kuo Lee Shiyu Zhang Shiyu Zhang Syed Bukhari Syed Bukhari Darren Cadman Darren Cadman J. C. Vardaxoglou J. C. Vardaxoglou William Whittow William Whittow Complex permittivity measurement system for solid materials using complementary frequency selective surfaces Loughborough University 2020 dielectric losses dielectric measurement frequency selective surfaces permittivity 2020-01-09 14:13:33 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Complex_permittivity_measurement_system_for_solid_materials_using_complementary_frequency_selective_surfaces/11536452 This paper describes a novel method of characterizing complex permittivity using a complementary frequency selective surface (CFSS). The CFSS provides a passband behavior and the change in the passband when a material under test (MUT) is placed adjacent to the CFSS has been used for retrieving of the complex permittivity of the MUT. The complex permittivity of the MUT are determined based on the measured bandpass resonant frequency and insertion loss of the CFSS with the MUT. This is an amplitudeonly method where phase measurements are not required. This technique offers a convenient, fast, low-cost and nondestructive measurement that is not restricted by the sample size or shape