Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-01-02
1976-06-15
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343854, H04B 700
Patent
active
039640663
ABSTRACT:
An electronic scan system with excitation arrangement for producing a directive radiation pattern from a circular or cylindrical array at a predetermined pointing angle.
The circular or cylindrical array provides random beam pointing. An RF input-output port feeds an equal amplitude distribution network providing as many outputs as there are elements of the array employed at any given time. An equal number of phase shifters is included, and gross beam positioning is effected through selection of the contiguous element group to be excited by means of RF switching. The phase shifters may then be controlled to provide the specific beam pointing or scan desired within the selected sector. The antenna elements of the array are fed through a passive interconnecting matrix responsive thereto, said matrix providing inherent amplitude taper across the effective aperture. The passive interconnecting matrix replaces the more complicated and expensive "ordering" matrix employed in prior art systems of the same general type.
REFERENCES:
patent: 3329897 (1967-07-01), Preble
patent: 3531803 (1970-09-01), Rosen et al.
patent: 3573837 (1971-04-01), Reindel
patent: 3653057 (1972-03-01), Charlton
patent: 3707719 (1972-12-01), Mark
patent: 3816830 (1974-06-01), Giannini
patent: 3824500 (1974-07-01), Rothenberg
patent: 3827055 (1974-07-01), Bogner et al.
patent: 3836970 (1974-09-01), Reitzig
Blum T. M.
International Telephone and Telegraph Corporation
O'Neil William T.
Wilbur Maynard R.
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