The Corbino approach, where the sample of interest terminates a coaxial cable, is a well-established method for microwave spectroscopy. If the sample is dielectric and if the probe geometry basically forms a conductive cavity, this combination can sustain well-defined microwave resonances that are detrimental for broadband measurements. Here, we present detailed simulations and measurements to investigate the resonance frequencies as a function of sample and probe size and of sample permittivity. This allows a quantitative optimization to increase the frequency of the lowest-lying resonance.
Microwave resonances in dielectric samples probed in Corbino geometry: Simulation and experiment
M. Maximilian Felger, Martin Dressel, Marc Scheffler; Microwave resonances in dielectric samples probed in Corbino geometry: Simulation and experiment. Rev. Sci. Instrum. 1 November 2013; 84 (11): 114703. https://doi.org/10.1063/1.4827084
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