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:
Jan. 16, 2001
Filed:
Jun. 24, 1999
Martin Smith, Chelmsford, GB;
Roger Adrian Perrott, Chelmsford, GB;
Nortel Networks Corporation, Montreal, CA;
Abstract
A flat-plate dual band antenna element is described which comprises two superposed sets of excitation probes and apertures each of which operates in a different frequency band. These antenna elements are used in an array together with a plurality of single band elements to create a flat-plate, dual band array antenna that is low cost and permits monopulse alignment methods and distributed power amplification to be used. The geometric arrangement of the antenna elements is such that distribution networks for the excitation probes can be accommodated in the limited space available. Dual band flat-plate array feeds for a reflector antenna are also described. These use either a combination of the above mentioned dual band antenna elements and single band antenna elements or alternatively, two sizes of single band antenna elements. The geometric arrangement of the antenna elements in these array feeds is such that transmit and receive beams are provided that have co-incident phase centers and approximately equal beamwidths.