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. 23, 1997
Filed:
Apr. 24, 1995
David P Morgan, Northampton, GB;
Advanced SAW Products SA, Bevaix, CH;
Abstract
A SAW filter comprising at least one group of N tracks, where N is an integer greater than 2, and including at least one input interdigitated transducer (IDT) spaced apart from at least one output IDT and a reflector disposed substantially collinear with and adjacent the input and output IDTs. The respective tracks are adapted to have different effective electro-acoustic lengths such that SAWs launched from respective input IDTs undergo at least one reflection at corresponding output IDTs and at least one reflection from the respective input IDTs prior to generating coherent signals from respective output IDTs. The different effective electro-acoustic lengths may be substantially provided by there being different physical separation between input and output IDTs of respective tracks, or by IDTs of respective tracks having different polarity connections of electrodes or different amounts of material disposed in respective tracks between the input and output IDTs.