Patent
Radio frequency beam forming network
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TLDR
In this paper, a radio frequency beam forming network is disclosed, where a plurality of antenna feed elements arranged in the focal plane of a RF lens is coupled to corresponding input ports of a RDF energy distributing means.Abstract:
A radio frequency beam forming network is disclosed wherein a plurality of antenna feed elements arranged in the focal plane of a radio frequency lens is coupled to corresponding input ports of a radio frequency energy distributing means. Output ports of such radio frequency energy distributing means are coupled to a receiver/transmitter through different paths. Disposed in the different paths are active elements, including variable phase shifters and attenuators. The active elements, in response to control signals, provide proper attenuation and phase shift to the signals passing therethrough thereby to form a desired antenna beam. Such antenna beam is comprised of one or more "spot" beams. With such arrangements failure of a single one of the active elements will only slightly degrade system performance without resulting in a complete loss of any one of the "spot" beams.read more
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References
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Patent
Amplitude modulation scanning antenna system
TL;DR: In this paper, an antenna system forming a cluster of closely spaced beams filling a desired angular scan sector is disclosed, where 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.
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Butler submatrix feed for a linear array
TL;DR: In this article, the authors proposed a sub-matrix feed system for beamforming and scanning networks, which consists of a set of low order Butler matrices simulating a single higher order Butler matrix.