Patent ID: 7336017

Claim:
A surface acoustic wave package, comprising: a first bare chip having a plurality of electrodes formed on a lower surface of said first bare chip; a second bare chip having a plurality of electrodes formed on an upper surface of said second bare chip and via-holes formed through said second bare chip, wherein the first bare chip is stacked on the second bare chip with the electrodes on the lower surface of the first bare chip facing the electrodes on the upper surface of said second bare chip; a connecting portion electrically connecting the electrodes of the first bare chip to corresponding ones of the electrodes of the second bare chip; and a sealing member provided on the first and second bare chips to form an air-tight space between the first and second bare chips; wherein the first and second bare chips are piezoelectric single crystal elements; the electrodes of each of the first and second bare chips comprise an input electrode, an output electrode, and IDT electrodes; and the IDT electrodes formed on the lower surface of the first bare chip are different in length, width, and gap between the IDT electrodes from the IDT electrodes formed on the upper surface of the second bare chip.