Accession Number : ADD010094

Title :   Temperature Compensated Berlinite for Surface Acoustic Wave Devices.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Carr,Paul H ; Silva,Jose H

Report Date : 27 Jan 1983

Pagination or Media Count : 17

Abstract : The 19.1 propagation X-cut berlinite (AlPO4) has been discovered to have cubic temperature compensation for surface acoustic waves (SAW). The temperature variations of frequency or time delay over a 35 to 85 degrees C temperature range are comparable to ST-quartz. However, berlinite has at least twice the piezoelectric coupling. This is essential for low insertion loss, broadband SAW devices such as filters and correlators. In addition, 19.1 propagation, X-cut berlinite has lower volume wave spurious than ST-cut quartz. (author)

Descriptors :   *Patent applications, *Surface acoustic waves, *Aluminum compounds, *Phosphates, Broadband, Temperature, Variations, Time, Delay, Quartz, Coupling(Interaction), Insertion loss, Filters, Inventions, Propagation

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE