05973641 is referenced by 93 patents and cites 3 patents.

In accordance with the present invention, there is provided a linear antenna array comprising a number of antenna elements and a feed network, wherein the feed network is operable to apply the cumulative effect of a progressive phase shift across the antenna elements of the array and a stepped complex operator shift to selected groups of antenna elements of the array, whereby a down tilted and null-free coverage by a resulting radiation pattern can thereby be provided. The complex operator can be phase, amplitude or a combination of both. The antenna array can be a layered antenna and the phase shifts in the feed network can be provided by differing length transmission paths, whilst any amplitude shift can be provided by unequal power dividers. In order to provide no down tilt and just null fill-in, then the progressive phase shift can be specified to be zero.

Title
Antenna feed network arrangement
Application Number
8/849272
Publication Number
5973641
Application Date
May 22, 1997
Publication Date
October 26, 1999
Inventor
David Neil Adams
Chelmsford
GB
Martin Stevens Smith
Chelmsford
GB
Adrian David Smith
Paignton
GB
Agent
Lee Mann Smith McWilliams Sweeney & Ohlson
Assignee
Northern Telecom
CA
IPC
H01Q 3/26
H01Q 3/24
H01Q 3/22
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