Cellular antennas for stratosphere coverage of multi-band annular earth pattern
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United States of America Patent
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Nov 9, 1999
Issued Date -
N/A
app pub date -
May 29, 1998
filing date -
Feb 20, 1998
priority date (Note) -
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Abstract
Cellular antenna systems are provided for airship-type support at a position in the stratosphere. A single antenna system (20) may provide cellular communication for earth-based users located anywhere within a circle 400 miles in diameter (10). By use of array assemblies (21a) each providing 12 side-by-side beam positions per quadrant, with higher and lower elevation beams (32a', 36a') at each beam position, coverage can be provided for 96 cells arranged side-by-side in inner and outer annular bands (10). A turnstile-type antenna (26) provides coverage for a 97th central circular cell. By allocation of available groups of cellular frequencies in repetitive patterns around the outer annular band (1-6, FIG. 1), with frequency reuse in offset positions around the inner annular band, 16 times frequency reuse is provided while maintaining acceptable co-channel interference levels. A total number of channels of the order of 5,800 channels is thus provided for AMPS band A or band B usage with a single antenna system. Arrangements employing 6 dB attenuation (60) of signal levels at array edge elements provide reduced co-channel interference without diminishing antenna system gain at beam crossover angles.
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