Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1978-03-09
1980-01-22
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343771, 343895, H01Q 1502
Patent
active
041852869
ABSTRACT:
A nondispersive array antenna comprises a linear primary radiator array in the form of a slotted waveguide emitting high-frequency waves toward a linear secondary radiator array including an acute angle .alpha. with the primary array, this angle .alpha. being approximately equal to (.pi./4) -(.theta..sub.o /2) where .theta..sub.o is the angle included by the emitted beam with the perpendicular to the waveguide in the plane of radiation. The secondary array includes a row of elemental radiation receivers on the side facing the primary array and as many elemental radiation emitters on the opposite side; each radiation receiver is linked to a respective radiation emitter through a coupling introducing a predetermined phase shift between incoming and outgoing radiation, these phase shifts compensating for the phase displacement occurring along the arrays in the free-space propagation of the waves from one array to the other. The elemental radiation emitters may be helices with axes perpendicular to the secondary array, the introduced phase shift being determined by the angular orientation of each helix. A multiplicity of primary and secondary arrays may be superposed to form radiating panels for the emission of a beam of two-dimensional cross-section whose angular orientation relative to the plane containing the angle .alpha. can be varied by adjusting the relative phasing of waves fed to the waveguides constituting the primary panel.
REFERENCES:
patent: 3631503 (1971-12-01), Tang et al.
patent: 3931624 (1976-01-01), Hundley et al.
patent: 3971022 (1976-07-01), Lenz
patent: 3978484 (1976-08-01), Collier
patent: 4044360 (1977-08-01), Wolfson et al.
Daveau Bernard
Drabowitch Serge
"Thomson-CSF"
Lieberman Eli
Ross Karl F.
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