A Dielectric Loaded Resonator for the Measurement of the Complex Permittivity of Dielectric Substrates

A new configuration of dielectric-loaded resonator (DR), particularly versatile for the complex permittivity measurement substrates microwave circuits, even in presence back metal plates, is shown here. To test this technique a wide interval values permittivity, versatility 3-D printing exploited to print samples with different densities, thus artificially changing effective (1.7–3.1) real part and (0.02–0.06) imaginary part. The designed resonator, tuned at ~12 GHz, experimentally validated by comparison measurements obtained on these split ring (SRR) standard transmission/reflection waveguide methods. Then, characterization FR4-fiberglass Kapton polyimide samples.