MSAT mast antenna with reduced frequency scanning
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United States of America Patent
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-
Jan 16, 1996
Grant Date -
N/A
app pub date -
May 10, 1993
filing date -
May 10, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A mobile vehicular antenna for use in accessing stationary geosynchronous and/or geostable satellites. A multi-turn quadrifilar helix antenna is fed in phase rotation at its base and is provided with a pitch and/or diameter adjustment for the helix elements, causing beam scanning in the elevation plane while remaining relatively omni-directional in azimuth. The antenna diameter and helical pitch are optimized to reduce the frequency scanning effect. A technique is provided for aiming the antenna to compensate for any remaining frequency scanning effect.
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