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. 14, 2000
Filed:
May. 19, 1998
Robert C Hildebrand, Indialantic, FL (US);
Gayle P Martin, Merritt Island, FL (US);
Harris Corporation, Melbourne, FL (US);
Abstract
The elements of a spatially aperiodic phased array antenna have an unequally spaced circular distribution, that is effective to decorrelate angular and linear separations among elements of the array. For any radial direction passing through an element of the array, the vector distance from any point along that radial direction to any two elements of the array is unequal and uniformly distributed in phase, modulo 2.pi.. Angular separation between successively adjacent antenna elements varies in accordance with an Nth root of two, wherein N is the number of antenna elements in the array. To locate each element, a first element is placed at any arbitrary location along the circumference of the array. The angular spacing .alpha..sub.1 of a second element relative to the first element is defined such that .alpha..sub.1 =2.pi.*(2.sup.1/N -1). The angular spacing .alpha..sub.j of each additional element relative to the first element is defined by .alpha..sub.j =.alpha..sub.j-1 *2.sup.1/N, where j varies from 2 to N. Without spacial correlation among elements of the array, sidelobes are diminished, allowing nulls to be placed upon selected co-channel interferers.