Electrically scanned antenna system and modulator for omnidirect

Details Electrically scanned antenna system and modulator for omnidirect Electrically scanned antenna system and modulator for omnidirect

1978-01-25

1978-11-14

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343107, G01S 108

Patent

active

041258363

ABSTRACT:
An antenna system in which the antennas are not mechanically rotated generates an amplitude-modulated signal of equal intensity in all horizontal directions with the phase of the amplitude modulation varying directly with bearing or azimuth to the antenna system. The antenna system uses a central antenna which radiates a carrier signal and a plurality of sideband antennas, 4 in number, which radiate upper and lower sideband signals. The phase of the upper sideband signal is advanced in increments of .pi./2 radians processing around the sideband antennas in a chosen direction, while the phase of the lower sideband signal is delayed in increments of .pi./2 radians proceeding around the sideband antennas in the chosen direction.

REFERENCES:
patent: 3133282 (1964-05-01), Rosen
patent: 3725929 (1973-03-01), Spanos
patent: 3787859 (1974-01-01), Howard
patent: 3827050 (1974-07-01), Glazer et al.

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