Surface acoustic wave substrates for high temperature applications

A systematic search of several piezoelectric substrates and crystallographic orientations has been conducted in an effort to identify temperature compensated cuts. As a result of this search, a sequence of crystallographic orientations along the rotated Y-cut (RYC) in quartz has been identified as appropriate for operation over a broad range of temperatures. Theoretical calculations, in fact, show that different orientations along RYC quartz provide compensation at temperatures ranging from -35/spl deg/C to over 500/spl deg/C, thereby allowing one to select an appropriate temperature stable orientation for a particular application. Experimental measurements performed on selected RYCs in quartz have confirmed these predictions of temperature stability.