Amplitude modulation scanning antenna system

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 initiall...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HEMMI, CHRISTIAN O, HAYES, WILLIAM F
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES ANTENNAS, i.e. RADIO AERIALS BASIC ELECTRIC ELEMENTS DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRICITY LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	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.