Patent ID: 8194387

Claim:
A multi-layered capacitor having three or more capacitor layers, comprising: a first layer comprising a first positively DC-biased, tunable capacitor; a second layer, acoustically coupled to and positioned over the first layer, comprising a second negatively DC-biased, tunable capacitor sharing a common electrode with the first tunable capacitor; a third layer, acoustically coupled to and positioned over the second layer, comprising a third positively DC-biased, tunable capacitor sharing a common electrode with the second tunable capacitor; wherein each dielectric of the first, second, and third capacitors has a resonance of about the same frequency, within 5%, and wherein inner electrodes of the first, second, and third layers have a resonance of about the same frequency, within 5%; whereby the resonance of each layer is a function of at least one of thickness, density, and material; wherein the first, second, and third layers are biased to generate destructive acoustic interference; wherein the multi-layer capacitor is operable at frequencies greater than 0.1 GHz; wherein a total number of positive DC-biased dielectric layers is not equal to a total number of negative DC-biased dielectric layers; and wherein a bottom electrode of the first tunable capacitor is unbiased.