Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1997-05-02
2000-06-06
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
H01Q 322
Patent
active
060724323
ABSTRACT:
An antenna system producing a multi-beam antenna pattern having reduced sidelobe levels with a uniform beam pattern includes an antenna having a plurality of co-linear arrays of radiating elements including central co-linear arrays each of which has an identical number of radiating elements and a pair of outermost co-linear arrays each having a single radiating element. Each of the central co-linear arrays receives the full power output from a corresponding output of a Butler-matrix feed network except for two of the central radiating elements adjacent to the two outermost co-linear arrays, which each share the output power from a corresponding one of the outputs from the Butler-matrix feed network with one of the outermost co-linear arrays. In particular the power is shared between one of the outermost co-linear arrays and a corresponding one of the central co-linear arrays adjacent to the other outermost co-linear array utilizing a power splitter which splits the power between the corresponding central co-linear array and the outermost co-linear array. Each co-linear array includes a feed strap interconnected to each element in the co-linear array. The feed straps for the central co-linear arrays implement an identical trim configuration, and the feed straps for the outermost co-linear arrays introducing a phase shift of .lambda./2, where .lambda. is the wavelength of the electromagnetic energy to be received or transmitted.
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Hartung Dirk
Hunt Warren Frederick
Powell Charles M.
Hellner Mark
Radio Frequency Systems Inc.
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