Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2007-07-16
2009-02-10
Dinh, Trinh V (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S850000, C343S895000
Reexamination Certificate
active
07489281
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.
REFERENCES:
patent: 5828348 (1998-10-01), Tassoudji et al.
patent: 7173576 (2007-02-01), O'Neill et al.
patent: 7245268 (2007-07-01), O'Neill et al.
patent: 7391386 (2008-06-01), Sawaya et al.
Choi Sang Ok
Farrar John C.
Fugate Murray
Han Eun Seok
Jo Young-Min
Beusse Wolter Sanks Mora & Maire, P.A.
DeAngelis John L.
Dinh Trinh V
Sky Cross Inc.
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