Id. Avramov et M. Suohai, SURFACE TRANSVERSE-WAVES EXCEED THE MATERIAL Q-LIMIT FOR SURFACE ACOUSTIC-WAVES ON QUARTZ, IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 43(6), 1996, pp. 1133-1135
State-of-the-art 1.244-GHz surface transverse wave (STW) resonators on
AT-cut quartz are characterized, They demonstrate an unloaded Q of 81
44 which is as high as 97% of the material Q limit for surface acousti
c waves (SAW's). By analyzing the measured data and accounting for the
ohmic loss, it is shown that the material Q for STW's on quartz, expe
rimentally obtained from these devices, is at least 37% higher than th
e material Q for SAW's.