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:
Nov. 12, 2002
Filed:
Dec. 21, 2000
David S. Yip, La Mirada, CA (US);
Alvin M. Kong, Manhattan Beach, CA (US);
Rahil U. Bhorania, Redondo Beach, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
The invention relates to a new family of surface acoustic wave single-phase unidirectional transducers (SPUDTs) by using M uniform width, uniformly spaced, single-level interdigitated electrodes lying on a uniform grid of a piezoelectric substrate where unidirectionality is achieved by selectively etching reflective structures into the substrate either in the spaces located between adjacent electrodes or under selected electrodes of the transducer. A SAW filter, resonator or delay line can also be formed by fabricating two such transducers on a single substrate, each having surface acoustic waves radiating towards the other.