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. 30, 1997
Filed:
Nov. 08, 1995
Brent T Toland, Manhattan Beach, CA (US);
William M Hughes, Torrance, CA (US);
Dan R Johnson, Los Angeles, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A beam waveguide type dual reflector (3, 4) type antenna, referred to as a Cassegrain antenna, is constructed with a beam waveguide (5, 6, 9, 11, 13, 15), having three axes of rotation (X1, Y1, & Z1), the first (X1) and second axes (Y1) of rotation being perpendicular to each other and the second (Y1) and third (Z1) axes of rotation being perpendicular to each other and with the spacing between the first (X1) and third (Z1) axes being constant to achieve a greater field of view, while retaining the capability of handling simultaneously cross polarized microwave signals. Actuator singularities, defining forbidden regions, singularity associated with rotation about the first and second axes are avoided by switching to rotation about the first and third axes as the singularity is approached by the antenna, permitting the antenna to move through that singularity region.