Patent ID: 6472954
Filing Date: 2002-10-29
Classification: H03H,Y10T

Abstract:
A method of fabricating an array of acoustic resonators comprising the steps of:selecting a first target frequency response and a first target effective coupling coefficient for operation of a first film bulk acoustic resonator (FBAR) filter; selecting a second target frequency response and a second target effective coupling coefficient for operation of a second FBAR filter, said first target effective coupling coefficient being substantially degraded relative to said second target effective coupling coefficient; determining thicknesses and materials of piezoelectric and electrode layers for forming said first and second FBAR filters so as to achieve said first and second target frequency responses and said first and second target effective coupling coefficients, including selecting an increased electrode layer thickness for at least one electrode layer of said first FBAR filter, said increased electrode layer thickness being greater than electrode layer thicknesses selected for said second FBAR filter such that said substantially degraded first target effective coupling coefficient is achieved; and forming said first and second FBAR filters based on said thicknesses and materials.