The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1999
Filed:
Jan. 29, 1997
Robert J Weber, Boone, IA (US);
Iowa State University Research Foundation, Ames, IA (US);
Abstract
A stacked thin film device structure grown on a substrate, the resonator structure comprising a thin film device comprising at least one piezoelectric crystal layer sandwiched between metallic electrodes, and constructed to have an acoustic response in a given frequency range, and an acoustical stack disposed between and joining the thin film device and the substrate and comprising multiple layers of material, each layer having a characteristic thickness and impedance and being composed of a non-lossless material, the characteristic thicknesses and impedances of the layers being adjusted to determine the input impedance presented to the thin film device, and thereby determining the acoustical coupling between the thin film device and the substrate.