Title :
Modelling the transverse-mode response of a two-port SAW resonator
Author_Institution :
Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada
fDate :
5/1/1991 12:00:00 AM
Abstract :
An equation is derived for the transverse-mode frequencies of a two-port surface-acoustic-wave (SAW) resonator with uniform reflection gratings. It is postulated that only odd-order (symmetric) transverse modes should be excited in such a grating, due to its symmetrical placement with respect to the interdigital transducer (IDT). Frequency response modeling involves a summation of one-dimensional transmission-matrix computations for the fundamental mode and participating transverse ones. Excellent agreement is obtained between theory and experiment for a 360-MHz resonator with three close-in transverse modes, attributed to symmetric modes of odd order m=3, 5, 7.<>
Keywords :
crystal resonators; surface acoustic wave devices; ultrasonic transducers; 360 MHz; close-in transverse modes; interdigital transducer; odd-order transverse modes; one-dimensional transmission-matrix computations; symmetric modes; symmetrical placement; transverse-mode response; two-port SAW resonator; uniform reflection gratings; Bragg gratings; Degradation; Diffraction gratings; Dispersion; Frequency response; Optical reflection; Resonance; Surface acoustic waves; Transmission line matrix methods; Voltage-controlled oscillators;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
