Antenna feed network arrangement
US5973641A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | May 22, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.