Patent ID: 7841055

Claim:
A method of fabricating an apparatus, the method comprising: fabricating a first resonator on a substrate, said first resonator comprising a bottom electrode and a top electrode sandwiching a piezoelectric layer; fabricating a sacrificial layer surrounding said first resonator; fabricating a second resonator on said sacrificial layer above said standoffs and above said first acoustic resonator, said second resonator comprising a bottom electrode and a top electrode sandwiching another piezoelectric layer, wherein said second acoustic resonator is vertically separated from said first acoustic resonator such that little or no acoustic energy is coupled between said first acoustic resonator and said second acoustic resonator; fabricating a standoff between said top electrode of said first acoustic resonator and said bottom electrode of said second acoustic resonator, wherein said top electrode of said first acoustic resonator and said bottom electrode of said second acoustic resonator are electrically connected by said standoff; and and removing said sacrificial layer.