Abstract
The cylindrical cavity resonator method based on the perturbation method, is a popular method for measuring the complex permittivity and the complex permeability by using perturbation formula. It is assumed here that the electromagnetic field in the resonator has no change distribution before and after we have inserted the sample. It is, however, well known that the measurement error increases, when a sample with large size, high complex permittivity and high complex permeability is chosen. In this paper, we calculate the resonant frequency and quality factor using finite difference time domain (FDTD) method with rotationally symmetric geometries on condition that a circular rod sample is inserted into the TM010 mode cylindrical cavity resonator. Consequently, the measurement error included in the real and imaginary parts of the complex permittivity was estimated quantitatively by the perturbation formula under the variation of the size and complex permittivity of the sample.
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