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:
Jun. 01, 1993
Filed:
Nov. 15, 1991
Louis A Kurtz, Woodland Hills, CA (US);
Robert L Eisenhart, Woodland Hills, CA (US);
Eric L Holzman, Rancho Palos Verdes, CA (US);
Ralston S Robertson, Northridge, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A polarimetric antenna (20) comprises a length of circular waveguide (30) having a sidewall (32) with a cylindrical internal surface (34). The sidewall (32) has two longitudinal slots (38) that extend parallel to a longitudinal axis (36) of the waveguide (30) and are symmetrically positioned with respect to the circumference of the circular waveguide (30). A first rectangular waveguide (40) communicates with one of the longitudinal slots (38), and a second rectangular waveguide (42) communicates with the other longitudinal slot (38), but is short circuited by a closure (44) at one end thereof. A transverse closure (46) is positioned over the circular waveguide (30) at one end, the closure (46) having a first and a second transverse slot (48, 50) therein. These slots (48, 50), which are preferably arcuate in form, are positioned symmetrically with respect to a longitudinal axis (36) of the circular waveguide (30). A third rectangular waveguide (52) is in communication with the first transverse slot (48), and a fourth rectangular waveguide (54) is in communication with the second transverse slot (50). The two rectangular waveguides (52, 54) are preferably excited through an E-plane folded magic Tee (58). This antenna (20) is used to radiate sub-microwave, microwave, or millimeter wave energy in applications such as a cassegrain tracking antenna (22).