Patent ID: 6121856
Filing Date: 2000-09-19
Classification: H03H

Abstract:
A bulk acoustic wave device producing selected modes of acoustic waves responsive to electrical signals applied to said device, said device comprising:a substrate having a first surface and a second surface, and having a first end and a second end;a piezoelectric material being bonded to both said first and said second surface of said substrate at both said first end and said second end of said substrate;a first plurality of electrodes located on said piezoelectric material bonded to said first surface and at said first end of said substrate;a second plurality of electrodes located on said piezoelectric material bonded to said first surface and at said first end of said substrate, said second plurality of electrodes being interspersed between said first plurality of electrodes;a third plurality of electrodes located on said piezoelectric material bonded to said second surface and at said first end of said substrate;a fourth plurality of electrodes located on said piezoelectric material bonded to said second surface and at said first end of said substrate, said fourth plurality of electrodes being interspersed between said third plurality of electrodes; andwherein said electrical signals having a first phase are applied to said first plurality and said fourth plurality of electrodes, and said electrical signals having a second phase are applied to said second plurality and said third plurality of electrodes to excite a first mode of acoustic waves in said bulk acoustic wave device; andwherein said electrical signals having a first phase are applied to said first plurality and said third plurality of electrodes, and said electrical signals having a second phase are applied to said second plurality and said fourth plurality of electrodes to excite a second mode of acoustic waves in said bulk acoustic wave device.