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. 08, 2004
Filed:
Apr. 03, 2003
Te-Kao Wu, Rancho Palos Verdes, CA (US);
Northrop Grumman Corporation, Redondo Beach, CA (US);
Abstract
A high performance multi-band antenna reflector having low sidelobe and cross polarization levels, and a superior carrier-to-interference ratio has two concentric zones ( in a first embodiment and in a second embodiment). In the first embodiment, the outer concentric zone ( ) is a frequency selective absorber ( ) made of a metallic pattern ( ) dimensioned to reflect signals in one frequency band and absorb signals in a second frequency band. In the second embodiment, the outer concentric zone ( ) is a frequency selective surface ( ) that reflects signals in one frequency band and passes signals in a second frequency bands. Resistance cards ( ) overlay the top and bottom sides of the junction between the frequency selective surface ( ) and a reflective layer ( ) on an inner surface ( ) of the central concentric zone ( ).