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Base station clustered adaptive antenna array
| Details |
Inventors: Wong, Piu Bill; Scherzer, Shimon B.;
Assignee: Metawave Communications Corporation (Redmond, CA)
Primary Examiner: Phan; Tho
Assistant Examiner:
Attorney, Agent or Firm: Fulbright & Jaworski L.L.P.
A base station clustered adaptive antenna array includes a plurality of clusters of antenna elements. Each cluster is spaced away from an adjacent cluster by a first predetermined spacing related to receive-mode beamforming and includes a plurality of transmit-receive antenna elements. Each element within the cluster is spaced away from an adjacent element by a second predetermined spacing related to transmit-mode beamforming. In order to reduce the visual impact of the antenna array, each cluster is included within a single exterior housing or radome. A medial receive-only antenna element may be provided between adjacent clusters to enhance beamforming for reverse link reception. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
3 shows a top view of a base station clustered adaptive antenna array 150 in accordance with one embodiment of the present invention.
The array 150 may be mounted to and supported at a useful service height by a conventional support structure, such as a triangular metal tower 12 of the type illustrated in FIG.
1.
In this embodiment, the antenna array 150 is intended for use within the 1.
9 GHz cellular telephone service.
However, the principles of the present invention also apply to other land mobile wireless services and bands.
As shown in FIG.
3, the antenna array 150 includes three clusters 152, 154 and 156 of antenna elements lying generally within a common horizontal plane parallel to the surface of the earth.
Each cluster is located at a corner of a triangular support structure 159.
Thus, in the present illustration, array cluster 152 is located at a corner 153, array cluster 154 is located at a corner 155, and array cluster 156 is located at a corner 157.
The antenna support structure 159 may be coextensive with a triangular tower, or it may be attached to, or extend from, another suitable support, such as a cylindrical column tower, for example.
Each cluster 152, 154 and 156 can include a single radome enclosure 158 of radio-transparent material.
The tower 12, the support structure 159 and each radome enclosure 158 may be imparted with a dull color having a hue and tone selected to blend in with the environment, thereby minimizing visual impact of the antenna array 150 at the vicinity of the base station and tower 12.
Each cluster may be mounted on an extension arm 163 which extends from each corner of the support structure 159 for a predetermined distance, to position each cluster outwardly from a center 161 of the support structure by a predetermined amount, such as approximately 78 cm.
The length of each extension arm 163 is adjustable, in one embodiment, over a range of -15 cm to +30 cm relative to the center 161.
Multiple closely spaced antenna elements are provided within each cluster
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