Communications: radio wave antennas – Antennas – Slot type
Patent
1977-12-29
1979-08-14
Lieberman, Eli
Communications: radio wave antennas
Antennas
Slot type
343771, H01Q 1310
Patent
active
041647424
ABSTRACT:
A slotted-waveguide linear array in which a pattern of slots in a narrow wall of a first waveguide forms the aperture of the array. A second waveguide runs parallel to the first guide, the other narrow wall of the first waveguide being a common wall with the second waveguide. The pattern of coupling holes through this common wall couples energy between the waveguides.
A feed arrangement, preferably including a 180.degree. hybrid, has two of its ports connected one each to the first and second waveguides, the difference port, when driven, providing 180.degree. phase feed of the two waveguides so that the presence of the second waveguide is substantially nil. Thus, a single beam is formed as if the second waveguide were not present. The feed also provides for excitation of the waveguides through a mutual hybrid in-phase relationship when the sum port of the hybrid is driven, in which case the beam is angularly separated from the original beam.
REFERENCES:
patent: 3281851 (1966-10-01), Goebels
patent: 3570007 (1971-03-01), Whitehead
International Telephone and Telegraph Corporation
Lieberman Eli
O'Neil William T.
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