Title :
Transmission and reflection coefficients for surface transverse waves propagating under shorted metal strip gratings
Author :
Boyanov, Boyan I. ; Strashilov, Vesseline L.
Author_Institution :
Dept. of Solid State Phys., Sofia Univ., Bulgaria
Abstract :
Coupled-mode theory is used for the analysis of surface transverse waves (STWs) propagating under metal-strip gratings in the YZ plane of quartz. Analytical expressions are obtained for the reflection and transmission coefficients of waves propagating on rotated Y-cut substrates of weakly piezoelectric trigonal, tetragonal, or hexagonal crystals. A quadratic dependence of the stopband width on the height-to-period ratio of the electrodes is found. This is an agreement with stopband width measurements. The results can be used in the analysis of STW grating structures, particularly the two-port resonator filter.<>
Keywords :
crystal resonators; quartz; surface acoustic wave devices; surface acoustic waves; ultrasonic reflection; ultrasonic transmission; STW grating structures; SiO/sub 2/; YZ plane; coupled mode theory; height-to-period ratio; quadratic dependence; reflection coefficients; rotated Y-cut substrates; shorted metal strip gratings; stopband width; surface transverse waves; transmission coefficients; two-port resonator filter; weakly piezoelectric crystals; Equations; Frequency response; Gratings; Physics; Reflection; Resonance; Solid state circuits; Strips; Surface acoustic waves; Surface waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
