Title :
Resonant frequencies and Q factors of dielectric parallelepipeds by measurement and by FDTD
Author :
Trueman, C.W. ; Mishra, S.R. ; Larose, C.L. ; Mongia, R.K.
Author_Institution :
Concordia Univ., Montreal, Que., Canada
fDate :
June 27 1994-July 1 1994
Abstract :
This paper describes the measurement and computation of the resonant frequencies and the associated Q factors of dielectric parallelepipeds made of high-permittivity, low-loss ceramic materials. Each resonance peak is measured separately with a fine frequency step. A curve-fitting method is used to accurately estimate the resonant frequency and 3 dB bandwidth from the somewhat noisy measured data. The finite-difference time-domain method is used to compute the initial portion of the backscattered field due to a Gaussian pulse plane wave. The time response is then extended to zero value by Prony´s method. The measured and computed data is compared for a parallelepiped resonator of permittivity 37.84.<>
Keywords :
Q-factor measurement; curve fitting; dielectric measurement; dielectric resonators; finite difference time-domain analysis; frequency measurement; microwave measurement; radar applications; radar cross-sections; 7.5 GHz; FDTD; Gaussian pulse plane wave; Prony´s method; Q factors; backscattered field; curve-fitting; dielectric parallelepipeds; finite-difference time-domain method; noisy measured data; resonance peak; resonant frequencies; resonant frequency; time response; Ceramics; Concurrent computing; Dielectric materials; Dielectric measurements; Frequency measurement; Permittivity measurement; Q factor; Q measurement; Resonance; Resonant frequency;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333174
