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:
Sep. 10, 2002
Filed:
Jun. 19, 2001
Robert F. Milsom, Redhill, GB;
Koninklijke Philips Electronics N.V., New York, NY (US);
Abstract
A bulk acoustic wave device has a number of resonator elements ( ) which are laterally spaced such that a signal ( ) applied between to one resonator element ( ) at a resonant frequency of the device is coupled to the other resonator elements ( ) by acoustic coupling between piezoelectric layers of the resonator elements ( ). There are two outer resonator elements ( ) and at least one inner resonator element ( ). The terminals of the inner resonator elements are electrically connected together. This connection provides an AC short which eliminates the effect of the parasitic capacitances of the inner resonator elements, and provides electromagnetic shielding between the input and output of the device, by reducing the parasitic capacitance between the input and output upper electrodes.