Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Reexamination Certificate
2011-08-16
2011-08-16
Choi, Jacob Y (Department: 2821)
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
C343S895000
Reexamination Certificate
active
07999755
ABSTRACT:
A quadrifilar antenna having helical windings is fed by a phase shift feed network, each winding having an open circuit termination element, the phase shift feeding network having forward directional phase shift paths from a feed input to phase shift feed output ports, and having a first reverse directional transmission path from one or more of the phase shift feed output ports back to a first isolation port, and a second reverse directional transmission path from another one or more of the phase shift feed output ports back to a second isolation port, the first and second isolation ports isolated from the forward directional phase shift paths, and a differential termination impedance, floating from ground, connected the first and second isolation ports. Optionally, the differential termination impedance is frequency selective.
REFERENCES:
patent: 5872549 (1999-02-01), Huynh et al.
patent: 6421028 (2002-07-01), Ohgren et al.
patent: 2004/0017328 (2004-01-01), Merrill
PCT—Written Opinion of the International Searching Authority, dated Nov. 6, 2008.
Licul Stanislav
Marks Jeremy
Stutzman Warren L.
Choi Jacob Y
Karacsony Robert
Maxtena LLC
Stein, Esq. Laurence E.
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