| 摘要 |
Provided is an elastic wave device which makes use of an SH plate wave propagating in LiNbO 3 substrates, which can effectively increase the electromechanical coupling coefficient k 2 , and which, therefore, can increase the bandwidth ratio. An elastic wave device (1) making use of an SH plate wave propagating in LiNbO 3 substrates includes a LiNbO 3 substrate (3), IDT electrodes (4) placed on at least one surface of the LiNbO 3 substrate (3), and a support (2) which is bonded to the LiNbO 3 substrate (3) such that the support (2) is located outside a region provided with the IDT electrodes (4) and supports the LiNbO 3 substrate (3), wherein ¸ of the Euler angles (0°, ¸, 0°) of the LiNbO 3 substrate (3) ranges from 92° to 138° and the thickness of the LiNbO 3 substrate (3) ranges from 0.05» to 0.25», where » is the wavelength determined by the pitch between electrode fingers of the IDT electrodes (4). |
