Patent ID: 8631547

Claim:
A method of producing an acoustic resonator device formed by a piezoelectric material interposed between two conductors on a substrate comprising: depositing a first metal film directly on a substrate; patterning said first metal film to form an electrode region; forming a layer of piezoelectric material on the patterned first metal film thereby acoustically isolating said piezoelectric material to reduce the amount of acoustic energy which propagates in a lateral direction away from the device wherein said isolating is accomplished by limiting growth of oriented piezoelectric material to the patterned electrode regions on the substrate during fabrication, thereby forming isolated islands of said piezoelectric material which are subsequently interconnected, thereby limiting the creation or propagation of energy in lateral modes wherein said step of isolating further includes disrupting crystal orientation of the piezoelectric material during growth of the piezoelectric material on the substrate by selectively altering the surface of the substrate prior to deposition of the piezoelectric material thereon, so as to form regions of piezoelectric material where transduction between acoustic and RF energy is enhanced and regions where this transduction is degraded.