Radio antenna matching circuit
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United States of America Patent
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Dec 16, 2003
Grant Date -
Mar 27, 2003
app pub date -
Sep 21, 2001
filing date -
Sep 20, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Matching circuit for radio antenna that functions on a two-frequency band which are spaced approximately at a distance of one octave, wherein the upper band is broad. For instance, the first frequency band may be 890-940 MHz and the other band 1710-2200 MHz. The radiator may be a dipole or a monopole over the earth plane, whose bandwidth is sufficient for the first band. The larger bandwidth for the second band is obtained with a transmission circuit that moves and forms the frequency curve stepwise in the Smith chart. When necessary, the matching circuit includes a broadband Balun transformer in addition to said matching circuit.
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