Determination of the equivalent circuit for a cylindrical loop-coupled cavity resonator

In this paper we present the calculation of the equivalent circuit's parameters for a magnetic loop-coupled cylindrical resonant cavity. This analysis is valid even for moderated quality factors, Q. The equivalent circuit is determined via field analysis using the Lagrangian formulation considering all terms of the mathematical formalism, whose RLC parameters are determined using a Vector Network Analyzer and the critical points method. This approach offers an interesting insight useful to characterize resonant cavities with potential application in electromagnetic material characterization.