In this study the conventional dielectric waveguide model (CDWM) is used to determine the resonance frequency of a rectangular dielectric resonator operating at the TEy111 mode for antenna application. A fitted closed form formula is obtained for the prediction of the resonance frequency. The results obtained are compared with the experimental results and that determined using the Marcatili and EDC methods. The formula provides a simple method for the estimation of the resonance frequency of the TEy111 mode with an error ranging from –9.3% to +2.05% for r<100.

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