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:
Dec. 28, 2004
Filed:
Feb. 28, 2003
Davis S. Yip, La Mirada, CA (US);
Edward M. Garber, Los Angeles, CA (US);
Alvin M. Kong, Manhattan Beach, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
A dual track SAW reflector filter ( ) including a first track ( ) and a second track ( ). The first track and the second track ( ) include an input transducer ( ), an output transducer ( ), first reflectors ( ) and second reflectors ( ). The reflectivity function of the first reflectors ( ) and the second reflectors ( ) are equal in magnitude and opposite in phase. The input transducers ( ) have the same polarity and the output transducers ( ) have opposite polarities. Surface acoustic waves produced by the input transducers ( ) and received directly by the output transducers ( ) are in phase and cancel at the output transducers ( ). Surface acoustic waves reflected by the reflectors ( and ) are in phase and add at the output transducers ( ).