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:
Oct. 23, 2012
Filed:
Mar. 07, 2011
Benjamin P. Abbott, Maitland, FL (US);
Robert Aigner, Ocoee, FL (US);
Alan S. Chen, Windermere, FL (US);
Julien Gratier, Watertown, MA (US);
Taeho Kook, Orlando, FL (US);
Marc Solal, Longwood, FL (US);
Kurt G. Steiner, Orlando, FL (US);
Benjamin P. Abbott, Maitland, FL (US);
Robert Aigner, Ocoee, FL (US);
Alan S. Chen, Windermere, FL (US);
Julien Gratier, Watertown, MA (US);
Taeho Kook, Orlando, FL (US);
Marc Solal, Longwood, FL (US);
Kurt G. Steiner, Orlando, FL (US);
TriQuint Semiconductor, Inc., Hillsboro, OR (US);
Abstract
An acoustic wave device operable as a piston mode wave guide includes electrodes forming an interdigital transducer on a surface of the piezoelectric substrate, wherein each of the plurality of electrodes is defined as having a transversely extending center region and transversely opposing edge regions for guiding an acoustic wave longitudinally through the transducer. A Silicon Oxide overcoat covers the transducer and a Silicon Nitride layer covers the Silicon Oxide overcoat within only the center and edge regions. The thickness of the Silicon Nitride layer is sufficient for providing a frequency modification to the acoustic wave within the center region and is optimized with a positioning of a Titanium strip within each of the opposing edge regions. The Titanium strip reduces the acoustic wave velocity within the edge regions with the velocity in the edge regions being less than the wave velocity within the transducer center region.