Paul A Chiavacci

US Patent:

62259466, May 1, 2001

Filed:

Aug 26, 1999

Appl. No.:

9/383610

Inventors:

Randall William Kreutel - Woodinville WA
Paul Chiavacci - Stoneham MA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 326

US Classification:

342368

Abstract:

Mutual coupling between radiative elements (210, FIG. 2) in a phased array antenna (110, FIG. 1) is employed to extend the effective aperture dimension of a radiative element. Mutual coupling is used to force selected modal resonances to occur in the radiative elements (210). The forced modal resonances create zeroes of transmission which are employed to improve the roll-off characteristics of the radiative element's radiation pattern.

US Patent:

59232897, Jul 13, 1999

Filed:

Jul 28, 1997

Appl. No.:

8/901745

Inventors:

Kenneth Vern Buer - Gilbert AZ
John Wesley Locke - Tempe AZ
R. William Kreutel - Redmond WA
Paul Adrian Chiavacci - Stoneham MA
Daniel Francis DiFonzo - Rockville MD

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 326

US Classification:

342373

Abstract:

A modular phased array antenna for the formation of simultaneous independently steerable multiple beams, the modular phased array antenna comprising a modular array including a plurality of sub-array modules combined together in close proximity, each one of the plurality of sub-array modules including a plurality of input modules, a layer of a plurality of radiating antenna elements, a plurality of stacked beamformers arranged in series and each connected to one of the plurality of input modules and to the plurality of radiating antenna elements in beam communication.