Patent ID: 8693162

Claim:
A mobile device for providing wireless communications, the mobile device comprising: one or more electronic radio frequency components; and a multi-layer capacitor in communication with the one or more radio frequency components, wherein the multi-layer capacitor comprises: a first layer comprising a first tunable capacitor that is positively DC-biased; a second layer that is acoustically coupled to and positioned over the first layer, wherein the second layer comprises a second tunable capacitor that is negatively DC-biased, wherein the first and second tunable capacitors share a first common electrode; a third layer that is acoustically coupled to and positioned over the second layer, wherein the third layer comprises a third tunable capacitor that is positively DC-biased, wherein the second and third tunable capacitors share a second common electrode, wherein the first, second and third tunable capacitors are biased to generate destructive acoustic interference, wherein each dielectric of the first, second and third tunable capacitors has a resonance frequency within 5% of each other, wherein each of the first and second common electrodes have a resonance frequency within 5% of each other, wherein a total number of positively DC-biased dielectric layers of the multi-layer capacitor is not equal to a total number of negatively DC-biased dielectric layers of the multi-layer capacitor, and wherein a bottom electrode of the first tunable capacitor is unbiased.