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:
Nov. 29, 1994
Filed:
Jul. 02, 1993
Peter W Hannan, Smithtown, NY (US);
Hazeltine Corp., Greenlawn, NY (US);
Abstract
Mutual coupling effects, which would tend to degrade operation of a two-element end-fire array over a frequency band, are overcome by provision of an inter-element coupling impedance which is effective to equalize the Q at the inputs to the quadrature-excited elements. A quarter-wave transmission line section is coupled between the inputs to provide such impedance, which has a value selected to offset the effect of mutual coupling on Q. For a pair of monopoles, the inter-element coupling line is connected to the respective monopoles by quarter-wave sections having impedances selected in order to provide desired input impedances. The performance of dual-element end-fire slot or dipole array antennas may similarly be improved. Linear array antennas of four or more elements are provided by forced feeding of the additional elements from the basic dual-element configuration in accordance with the invention.