Patent ID: 6693501
Filing Date: 2004-02-17
Classification: H03H

Abstract:
A surface acoustic wave apparatus comprising:a piezoelectric substrate; a first surface acoustic wave filter device including a plurality of interdigital electrodes provided on the piezoelectric substrate along a direction in which a surface acoustic wave propagates; and a second surface acoustic wave filter device including a plurality of interdigital electrodes provided on the piezoelectric substrate along a direction in which a surface acoustic wave propagates, a propagation path of said first surface acoustic wave filter device being partially overlapped with a propagation path of said second surface acoustic wave filter device, wherein when the center-to-center distance between said first surface acoustic wave filter device and said second surface acoustic wave filter device is indicated by d1, and when the thickness of said piezoelectric substrate indicated by t, said first surface acoustic wave filter device, said second surface acoustic wave filter device, and said piezoelectric substrate are arranged to satisfy a condition d1&lE;2.3Ã—t or d1&gE;2.8Ã—t.