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. 05, 1989
Filed:
Sep. 18, 1986
Applicant:
Inventors:
Doren W Hess, Jr, Norcross, GA (US);
John R Jones, Lawrenceville, GA (US);
Assignee:
Scientific-Atlanta, Inc., Atlanta, GA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01Q / ;
U.S. Cl.
CPC ...
343786 ; 343703 ; 3437 / ;
Abstract
Circular open ended waveguide feeds for compact ranges. Feeds according to the present invention employ smaller apertures for a given frequency of operation than a standard compact range feed. According to a first embodiment of the invention, a circular open ended waveguide feed is constructed to operate with its lowest desired frequency of operation at approximately 1.01 times the cutoff frequency. A second embodiment includes a circular open-ended waveguide loaded with ridges to lower the cutoff frequency further and thus further reduce aperture size for a given bandwidth to radiate a broader beamwidth.