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:
Mar. 12, 1985
Filed:
Dec. 05, 1983
Applicant:
Inventor:
John Schofield, Coulsdon, GB;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
3103 / ; 3103 / ; 333151 ; 333154 ; 333195 ;
Abstract
A surface acoustic wave device includes apodized interdigital electrode arrays 2,3 coupled by a multistrip coupler 5. In a device in which the apodization 8 comprises a main lobe flanked by a succession of minor lobes, the effects of diffraction relating to short electrode pair overlaps are reduced by dividing at least the far end of the array into two or more series connected array portions 21, 22. Difficulties arising from unbalanced electrode edge overlaps at transitions 20 between different members of electrode pairs connected in series are reduced by locating such transitions in the region of nulls in the apodization pattern.