Amplitude modulation scanning antenna system

Details Amplitude modulation scanning antenna system Amplitude modulation scanning antenna system

1975-05-16

1976-11-23

Nelms, David C.

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343100SA, 343754, H01Q 326

Patent

active

039939995

ABSTRACT:
An antenna system forming a cluster of closely spaced beams filling a desired angular scan sector is disclosed. A transmit signal amplitude applied to each beam is modulated as a function of time to form a composite beam which scans smoothly across the scan sector. The RF transmit signal is initially split into a plurality of equal amplitude signals and fed to a plurality of attenuators by power dividers for selective amplitude modulation of the RF signals. The amplitude modulating signals are supplied the attenuator by a digital controller which also supplies switch control signals to selectively switch amplitude modulating transmit signals of varying amplitude to selected feed elements of an array of radiating elements in a time sequence for feeding an antenna reflector.

REFERENCES:
patent: 3259902 (1966-07-01), Malech
patent: 3496569 (1970-02-01), Alsberg et al.
patent: 3680110 (1972-07-01), Goldstone
patent: 3775769 (1973-11-01), Heeren et al.
patent: 3806932 (1974-04-01), Dietrich et al.
patent: 3893124 (1975-07-01), Barker

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