Input resistance of a hollow cylindrical cavity resonator excited by an electric probe

The authors investigate the input impedance of a cylindrical cavity resonator excited by an electric probe. The input impedance is considered as the superposition of a resistance due to the cavity structure and an impedance across the electric probe terminal. The electric Green's function due to an electric probe is derived. Based on this Green's function, the distribution of the electromagnetic field inside the cavity and the input impedance can be derived. A comparison of theoretical results with measurement shows good agreement.