Helical antenna
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United States of America Patent
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-
Sep 6, 2005
Grant Date -
Jul 1, 2004
app pub date -
Apr 23, 2002
filing date -
Apr 23, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to antennae and in particular to antennae of the multi-element helically wound type. An helical antenna according to the invention has at least one conductive helix having a vertically orientated central longitudinal axis wherein the helix is fixed at one end and rotatable at the opposite end; a non-conductive constant diameter support means located coaxial with said at least one conductive helix adapted to support said at least one conductive helix; and rotation means attached to said rotatable end of each of said at least one conductive helix arranged to change the pitch of said at least one conductive helix while maintaining the diameter of said at least one conductive helix to affect manipulation of the antenna pattern in gain and azimuth.
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