Laterally coupled bulk acoustic wave device

摘要

A laterally-coupled bulk acoustic wave device for acoustic coupling of signals having frequencies in a desired pass-band. The device comprises: a piezoelectric layer; a first electrode disposed on the piezoelectric layer defining a first electrode portion of the device; and a second electrode disposed on the piezoelectric layer defining a second electrode portion of the device. A gap portion of the device is defined between the first and second electrodes and a remaining portion of the device is defined around the electrodes. A layer structure of the device is adapted such that in the remaining portion the wave number for each of a plurality of desired eigenmodes within the pass-band is an imaginary number. This enhances coupling of frequencies in the pass-band between the first and second electrodes.