SURFACE ACOUSTIC WAVE DEVICE

摘要

PURPOSE:To form a surface acoustic wave device having an excellent temperature characteristic by using a rotation Y-cut crystal substrate cut by a prescribed cut angle. CONSTITUTION:In calculating theoretically the relation between a cut angle 0 and a delay time temperature coefficient (TCD) in the rotation Y-cut crystal substrate, four cut angles zeroing nearly the TCD are given. The TCD is zero at theta=0 deg.-25 deg. and theta133 deg.-143 deg.. Thus, the surface acoustic wave device having an excellent temperature characteristic is formed by using the rotary Y-cut crystal substrate 31 so as to form electrodes 32, 33 on the substrate 31.