Investigation to Improve Microwave Acoustic Delay Lines.
Final rept. 5 Feb 68-4 Feb 69,
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
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X-band cavities for shear wave generation with thin film piezoelectric transducers are described. Methods of Rayleigh and Love elastic surface generation on bulk quartz and thin films of CdS and ZnS are discussed. Attenuation measurements as a function of temperature and frequency are given. Contrary to published theoretical predictions, the attenuation of Rayleigh waves on quartz is found to be independent of frequency in the three phonon interaction temperature range. Velocity dispersion of Rayleigh waves in ZnS films on Al2O3 has been observed. Acoustic amplification of surface waves was investigated but not observed. Prototype surface wave directional couplers were fabricated and found to operate over a limited frequency range. Author
- Line, Surface and Bulk Acoustic Wave Devices
- Radiofrequency Wave Propagation