Feed network
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United States of America Patent
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-
Sep 7, 2004
Grant Date -
Mar 25, 2004
app pub date -
Sep 23, 2002
filing date -
Sep 23, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An antenna feed network including a 180.degree. hybrid coupler having a feed port, a 0.degree. port; and a 180.degree. port having an approximately 180.degree. phase difference with the 0.degree. port. A first antenna port is coupled to the 0.degree. port; and a second antenna port is coupled to the 0.degree. port via a respective phased line, the second antenna port having an approximately 90.degree. phase difference with the first antenna port. A third antenna port is coupled to the 180.degree. port; and a fourth antenna port is coupled to the 180.degree. port via a respective phased line, the fourth antenna port having an approximately 90.degree. phase difference with the third antenna port. The feed network can be used to drive antenna elements in phase quadrature. In a preferred embodiment the feed network drives a quadriflar helix antenna.
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