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:
Apr. 08, 1980
Filed:
Aug. 17, 1977
Gerald W Collins, Quincy, IL (US);
Harris Corporation, Cleveland, OH (US);
Abstract
A slot antenna having particular application to the field of UHF broadcasting. The antenna is comprised of a rigid coaxial waveguide which is dimensioned so that electromagnetic energy propagates therethrough in the TE.sub.11 mode. Two longitudinal baffles are provided at diametrically opposing circumferential positions within the waveguide. These baffles stabilize the orientation of the mode (i.e., the mode polarization) within the waveguide so that it is known. Alternate methods of establishing a fixed mode polarization are also disclosed. Slots are provided along the exterior of the waveguide in appropriate circumferential positions relative to the mode polarization. Since the TE.sub.11 mode includes both longitudinal and transverse current components, vertical, horizontal, or circular polarization may be generated through the selection of appropriate positions, shape, and orientations for the radiating slots. In one illustrated embodiment, orthogonal slots are provided at selected locations along the exterior of the cylinder so that circular polarization is transmitted by the antenna. The antenna is preferably center-fed through use of a coaxial feed line which is run along the center of the antenna to a center feed point. Various methods for coupling the electromagnetic energy from the coaxial feed line to the TE.sub. 11 waveguide are disclosed.