Quadrifilar helical antenna

Details Quadrifilar helical antenna Quadrifilar helical antenna

2011-07-12

2011-07-12

Dinh, Trinh V (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S860000, C343S893000

Reexamination Certificate

active

07978148

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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patent: 791978 (1997-08-01), None
patent: 2006/011723 (2006-02-01), None

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