Solidly-Mounted Agile Resonator / Transducer

Solidly mounted resonators (SMRs) were proposed by Newell in the mid-1960s. Decoupling from the mounting substrate was achieved at a single frequency by a Bragg stack of quarter-wavelength plates. While the initial concept was ahead of fabrication technology, SMRs are now a practical resonator design yielding high Qs in a space-efficient and robust mounting configuration. This paper introduces the concept of a Bragg anti-reflection stack made adjustable by endowing each layer with piezoelectricity and providing for changing the electrical boundary conditions.