Patent ID: 7616079

Claim:
A filter comprising resonators for use with bulk acoustic waves, each of the resonators for use with bulk acoustic waves comprising: a lower layer region comprising a first electrode; an upper layer region comprising a second electrode; and a piezoelectric layer between the first electrode and the second electrode; wherein two of the resonators are in a stacked crystal filter arrangement, the two of the resonators comprising two bulk acoustic wave resonators, the stacked crystal filter arrangement of the two bulk acoustic wave resonators comprising: piezoelectric layers between an upper electrode in the stacked crystal filter arrangement and a lower electrode in the stacked crystal filter arrangement; and a shared electrode among the piezoelectric layers in the stacked crystal filter arrangement; wherein an additional resonator is connected to the stacked crystal filter arrangement so that a combination of the two resonators and the additional resonator form an element of a lattice-type filter or a ladder-type filter, the additional resonator comprising a bulk acoustic wave resonator or an inductive-capacitive (LC) resonator; a capacitor in series or in parallel with one of the two resonators in the stacked crystal filter arrangement, and a multilayer substrate, wherein the capacitor is integrated into the multilayer substrate, the capacitor comprising structured metal layers within the multilayer substrate.