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US 4,091,387 AGranted
Beam forming network
AssigneeRCA Corporation
InventorCharles Edward Profera
Life of this patent
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Abstract
A radar antenna includes a plurality of radiators disposed near the focal point of a parabolic reflecting surface. The radiators are coupled to a sector horn waveguide via a plurality of phase shifters and a Butler matrix. The sector horn is concurrently excited in H.sub.10 and H.sub.12 modes of propagation to provide excitation to the radiators. Radiated energy from a radiator propagates to the reflecting surface and is reflected therefrom.
Claims6
A network for providing excitation in a desired pattern to a plurality of radiators of an antenna in response to an output from a transmitter, comprising:
- waveguide means for combining a field that has a known direction and an H.sub.10 mode of propagation with a field that has said known direction and an H.sub.12 mode of propagation, said propagations being from an input end to an output end of said waveguide means, thereby providing a composite field at said output end that has amplitudes that are a representation of amplitudes of a discrete inverse Fourier transform of said desired pattern;
- excitation means adapted for connection to said transmitter for concurrently causing said H.sub.10 mode and said H.sub.12 mode of propagation;
- phase shifting means connected to said output end for providing a signal representation of said discrete inverse Fourier transform;
- and
- a Butler matrix with inputs and outputs connected to said phase shifting means and to said radiators, respectively.
2 more elements
Dependencies are inferred from the claim text.