Interdigital transducers - A means of efficient bulk wave excitation
Abstract
The efficient excitation and detection of shallow bulk acoustic waves (SBAW) described does not require a piezoelectric overlay film such as ZnO on the transducers to enhance the coupling efficiency. The center frequency of operation on rotated Y-cut quartz is about 1.6 times higher than that of SAWs using identical interdigital transducers. There are many advantages of SBAW devices over both bulk waves and SAW devices. SBAW oscillators using AT-cut quartz should have device performance better than that of SAW oscillators using ST-cut quartz. Experiments on shallow bulk acoustic wave devices were performed on ST-cut quartz and 34 deg 36 min rotated Y-cut quartz. The first delay line used to excite shallow bulk acoustic waves consisted of two conventional SAW interdigital transducers.
- Publication:
-
31st Annual Frequency Control Symposium
- Pub Date:
- 1977
- Bibcode:
- 1977frco.symp..266Y
- Keywords:
-
- Acoustic Excitation;
- Digital Transducers;
- Frequency Response;
- Insertion Loss;
- Piezoelectric Transducers;
- Quartz Crystals;
- Acoustic Delay Lines;
- Coupling Circuits;
- Frequency Stability;
- Harmonic Oscillators;
- Surface Acoustic Wave Devices;
- Wave Excitation;
- Zinc Oxides;
- Electronics and Electrical Engineering