Circular phased array antenna having non-uniform angular separat

Details Circular phased array antenna having non-uniform angular separat Circular phased array antenna having non-uniform angular separat

1998-05-19

2000-11-14

Ho, Tan

Communications: radio wave antennas

Antennas

Plural antennas spaced a fractional or full wave length apart

343853, H01Q 2100

Patent

active

061476579

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.

REFERENCES:
patent: 3999187 (1976-12-01), Johnson
patent: 4555708 (1985-11-01), Waineo et al.
patent: 5767814 (1998-06-01), Conroy et al.

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