Quadrifilar helical antenna
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United States of America Patent
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Jul 17, 2007
Grant Date -
Feb 2, 2006
app pub date -
Nov 26, 2004
filing date -
Jul 28, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A quadrifilar helical antenna comprising two pairs of filars having unequal lengths and phase quadrature signals propagating thereon. A conductive H-shaped impedance matching element matches a source impedance to an antenna impedance. The impedance matching element having a feed terminal at the center thereof from which current is supplied to the two filars of each filar pair disposed about an edge of the impedance matching element and symmetric with respect to a center of the impedance matching element. The impedance matching element further comprises a reactive element for matching the antenna and source impedances.
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