Temperature compensated orientations of berlinite for surface acoustic wave devices

摘要

A piezoelectric wafer of single crystal berlinite, having a surface defined by an X-axis boule cut at an angle in the range from about 94 DEG -104 DEG , provides an improved substrate for a surface acoustic wave device. These cut angles are relatively easy to fabricate, provide excellent temperature compensation in a range from -55 DEG C. to 125 DEG C., and have high piezoelectric coupling coefficient.