Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-05-17
1977-08-16
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343113R, G01S 502
Patent
active
040429318
ABSTRACT:
A tracking system for use with an antenna having a multiple beam radiation pattern for sensing the direction of radiant energy incident upon the antenna. Pairs of the beams are selectively coupled to a monopulse comparator comprising a pair of hybrid couplers interconnected by a fixed phase shifter providing 90.degree. phase shift and by a pair of variable phase shifters providing phase shifts of equal magnitude but opposite sign. The output of the second hybrid coupler provides monopulse sum and difference signals. A sensing circuit responsive to the sum and difference signals operates the variable phase shifters to steer a null between the selected pair of beams.
REFERENCES:
patent: 3176297 (1965-03-01), Forsberg
patent: 3967279 (1976-06-01), Zeger
Bartlett Milton D.
Blum T. M.
Pannone Joseph D.
Raytheon Company
Warren David M.
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