Patent ID: 6865786

Claim:
A method for manufacturing a surface acoustic wave device using a Shear Horizontal type surface acoustic wave, comprising the steps of: preparing a quartz substrate; forming a metal film having a larger mass-load effect than that of aluminum on the quartz substrate; and patterning the metal film to form at least one interdigital transducer by one of reactive ion etching and a lift-off process such that a metallization ratio “d” and a normalized film thickness h/λ of the at least one interdigital transducer which makes a spurious transversal mode ripple to be about 1.5 dB or less are satisfied, where “d” is the metallization ratio of the interdigital transducer, “λ” is the wavelength of a surface acoustic wave, and “h” is the film thickness of the interdigital transducer.