RESONANT FREQUENCIES AND Q-FACTORS OF DIELECTRIC PARALLELEPIPEDS

This paper describes the measurement and computation of the resonant f requencies and the associated Q factors of low-loss ceramic parallelep ipeds with relative permittivity 37.84 and 79.46. Each sharp resonance peak is measured separately with a fine frequency step. The calculati on uses FDTD to compute the initial portion of the backscattered field as a function of time, due to a Gaussian pulse plane wave, The transi ent response is extended in time to zero value by Prony's method. The measured and computed resonant frequencies and Q factors are presented for two parallelepiped orientations and are in good agreement.