Apparatus and method for broadband matching of electrically small antennas
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United States of America Patent
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Sep 19, 2000
Grant Date -
N/A
app pub date -
Aug 3, 1998
filing date -
Sep 4, 1997
priority date (Note) -
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Abstract
A broadband impedance matching circuit employs active circuits featuring non-Foster reactance behavior, such as negative capacitor circuits and negative inductor circuits, to achieve extremely broadband matching of electrically small antennas. The matching circuit includes at least one non-Foster reactance circuit selected to neutralize the reactance exhibited by the antenna. The circuit further includes a dynamic dispersive impedance transformer circuit which compensates for the frequency dependent radiation resistance presented by the electrically small antenna. The dynamic dispersive impedance transformer is constructed using complementary Foster and non-Foster reactance circuits configured as an impedance transformer.
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