Accession Number : ADD012561

Title :   Temperature Compensated Berlinite for Surface Acoustic Wave Devices.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

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

Report Date : 02 Sep 1986

Pagination or Media Count : 7

Abstract : The 19.1 propagation X-cut of berlinite (AIPO4) has been discovered to have cubic temperature compensation for surface acoustic waves (SAW). The temperature variations of frequency or time delay over 35 deg c to 85 deg c. temperature range are comparable to ST-quartz. However, berlinite has at least twice the piezoelectric coupling. This 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 :   *PATENTS, *SURFACE ACOUSTIC WAVE DEVICES, *QUARTZ, *PHOSPHATES, *ALUMINUM COMPOUNDS, *SINGLE CRYSTALS, PIEZOELECTRIC MATERIALS, THERMAL STABILITY, INSERTION LOSS, SPURIOUS EFFECTS, TRANSDUCERS, SUBSTRATES, TEMPERATURE, BROADBAND

Subject Categories : Acoustics
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE