Quadrifilar helix feed network
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 12, 2002
Grant Date -
N/A
app pub date -
Nov 28, 2000
filing date -
Nov 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A radio antenna system having a quadrifilar antenna having four helical arms and a method of feeding the arms. The antenna system comprises a first balun having a feed line and two feed points with 180.degree. phase differential therebetween for feeding one opposite arm pair, and a second balun having a feed line and two feed points with 180.degree. phase differential therebetween for feeding the other opposite arm pair. The two feed lines are combined in a single combiner, which provides a 90.degree. phase differential between the feed lines.
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