| 摘要 |
<p>The present invention relates to antenna arrays and in particular relates to the problems associated with the downtilting of a beam. The present invention provides a linear antenna array comprising a number of radiating elements and a feed network, wherein the feed network is operable to apply the cumulative effect of a progressive phase shift to antenna elements across the array and a stepped complex operator shift to selected groups of antenna elements of the array, whereby a downtilted and null-free coverage by a resulting radiation pattern can thereby be provided. A method of operation is also disclosed.</p> |
