MSAT mast antenna with reduced frequency scanning

Details MSAT mast antenna with reduced frequency scanning MSAT mast antenna with reduced frequency scanning

1993-05-10

1996-01-16

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Spiral or helical type

343894, 343713, H01Q 136

Patent

active

054851700

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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Seavey Engineering Associates, Inc. Antenna Design and Development catalog, Oct., 1990.

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