Method for adjusting the temperature-dependent property of a surface acoustic wave device and a surface acoustic device

Abstract

The invention provides a method for adjusting the temperature-dependent property of a surface acoustic wave device is provided,, The method is appropriate for a temperature-dependent property that is expressed by a cubic function of a surface acoustic wave device using an in-plane rotated ST cut quartz crystal plate. The invention therefore provides a method for adjusting the temperature-dependent property of a surface acoustic wave device using an in-plane rotated ST cut quartz crystal plate having Euler angles of (0°, 113-135°, ±(40-49°)). The range of Euler angles is defined so that the temperature-dependent property of the surface acoustic wave device, using an in-plane rotated ST cut quartz crystal plate having the temperature-dependent property expressed by a cubic function, has an extreme value within the temperature range of −40 to +85° C., and the temperature-dependent property is rotated about the inflection point to minimize the frequency fluctuation within the operational temperature range by using appropriate regions.

Dependencies are inferred from the claim text.