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. 22, 2003
Filed:
Feb. 22, 2002
Peter C. Strickland, Ottawa, CA;
EMS Technologies Canada, Ltd., Ottawa, CA;
Abstract
A phased-array antenna whose main beam can be positioned (scanned) substantially anywhere within a full hemispherical coverage. The phased-array antenna consists of a plurality of radiating multi-filar helix antenna elements, each of which is independently rotatable on its helix axis relative to the antenna base plane. The rotation of each radiating element substantially decreases the noise temperature, the passive intermodulation of signals, and the sidelobe levels relative to an antenna which uses PIN diode phase shifters. A change in the radiated signal phase of each element in the antenna array is achieved by the mechanical rotation of the multi-filar helical antenna element on its axis. Mechanical rotation is provided by a drive system or multiple drive systems coupled to at least one radiating antenna element. The drive system rotates the at least one radiating element on its axis by various amounts. The amount of rotation is directly proportional to the amount of phase shift required of that particular multi-filar helical antenna element relative to the other antenna elements.