US 9,812,790 B2
Near-field gradient probe for the suppression of radio interference
Thomas G. Lavedas, Clifton, VA (US)
Assigned to RAYTHEON COMPANY, Waltham, MA (US)
Filed by Raytheon Company, Waltham, MA (US)
Filed on Apr. 2, 2015, as Appl. No. 14/677,130.
Claims priority of provisional application 62/015,679, filed on Jun. 23, 2014.
Prior Publication US 2015/0372395 A1, Dec. 24, 2015
Int. Cl. H01Q 21/28 (2006.01); H01Q 1/52 (2006.01); H01Q 7/00 (2006.01); H01Q 7/02 (2006.01)
CPC H01Q 21/28 (2013.01) [H01Q 1/521 (2013.01); H01Q 7/005 (2013.01); H01Q 7/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An antenna system, comprising:
a first loop antenna comprising a first conductor forming a first loop, the first loop having a first respective loop area;
a second loop antenna spaced apart from the first loop antenna, the second loop antenna comprising a second conductor forming a second loop, the second loop antenna having a second respective loop area;
a third loop antenna spaced apart from both the first and second loop antennas, the third loop antenna comprising a third conductor forming a third loop having a third respective loop area, wherein:
the first and third loop antennas are operably coupled together in electrical opposition to each other, configured to be driven to form a first independent balanced feed point, and configured to be substantially electrically and magnetically isolated from the second loop antenna;
the second loop antenna is configured to be driven from a second balanced feed point;
the first, second and third loops are configured such that a sum of the first and second respective loop areas, at a sum port in operable communication with the first and second balanced feed points, is substantially equivalent, within a predetermined tolerance, to the third respective loop area; and
the first and second balanced feed points are in operable communication with an automatic control system configured to automatically and independently adjust at least one of amplitude and phase for at least one of the first, second, and third loops in operable communication with at least one of the first and second balanced feed points, where each respective automatic and independent adjustment is configured to help to substantially maximize suppression of radio frequency interference (RFI) for a sum of signals from the first and second balanced feed points.