Patent ID: 7554244

Claim:
An agile tunable piezoelectric solidly-mounted resonator, comprising: a piezoelectric resonator; a plurality of piezoelectric layers of low mechanical impedance material and a plurality of piezoelectric layers of high mechanical impedance material are interleaved into a plurality of alternating piezoelectric bi-layers of low impedance material and high impedance material with a plurality of piezoelectric characteristics; said piezoelectric resonator having a bonded face, a given amount of acoustic energy and a given Q; said piezoelectric resonator is stacked on a first one of said plurality of bi-layers; said plurality of bi-layers are stacked on a substrate; at least one of said plurality of bi-layers is connected to an adaptive circuit that alternates with an external electrical impedance providing electrical energy between an open circuit and a short circuit; said plurality of bi-layers having a plurality of coherent internal reflections; and said bonded face, being subjected to a low acoustic impedance, is prevented from radiating said given amount of acoustic energy down into said plurality of bi-layers and into said substrate because said given amount of acoustic energy is reflected back to said resonator due to said plurality of coherent internal reflections to preserve said given Q, prevent an unwanted leakage, prevent an unwanted frequency shift and allows said resonator to be tunable.