SAW DEVICE HAVING QUARTZ PLATE FOR REDUCING VARIATION OF FREQUENCY TO TEMPERATURE AND METHOD FOR ADJUSTING A TEMPERATURE CHARACTERISTIC OF THE SAME

摘要

PURPOSE: A SAW(Surface Acoustic Wave) device having a quartz plate for reducing a variation of frequency to temperature and a method for adjusting a temperature characteristic of the same are provided to improve the temperature characteristic by using an in-plane rotated ST-cut SAW device. CONSTITUTION: An in-plane rotated ST-cut SAW device(3) includes an in-plane rotated ST-cut quartz plate(9) as a base plate. Two SAW elements(M1,M2) are disposed on a main surface of the in-plane rotated ST-cut quartz plate in order to generate SAWs having the propagation directions psi 1 and psi 2 which differ from each other. Each of the SAW elements is provided with a plurality of IDT(Inter-Digital Transducer) electrodes(6). The IDT electrodes are connected to a first electrical terminal(7) and a second electrical terminal(8) for supplying high frequency electric field. The positions of the first and the second electrical terminals are not limited.