Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Reexamination Certificate
2007-01-30
2008-05-06
Owens, Douglas W. (Department: 2821)
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
C343S850000, C343S860000, C343S749000, C455S333000, C455S338000, C455S326000
Reexamination Certificate
active
07369096
ABSTRACT:
A Radio Frequency (RF) structure services an antenna having a characteristic impedance and includes a differential Power Amplifier (PA), a differential Low Noise Amplifier (LNA), and a balun transformer. The differential PA has a differential PA output with a PA differential output impedance. The differential LNA has a differential LNA input with an LNA differential input impedance. The balun transformer has a singled ended winding coupled to the antenna, a differential winding having a first pair of tap connections coupled to the differential PA output and a second pair of tap connections coupled to the differential LNA input, and a turns ratio of the single ended winding and the differential winding. The turns ratio and the first pair of tap connections impedance match the PA differential output impedance to the characteristic impedance of the antenna. The turns ratio and the second pair of tap connections impedance match the LNA differential input impedance to the characteristic impedance of the antenna.
REFERENCES:
patent: 6809581 (2004-10-01), Rofougaran et al.
patent: 7129784 (2006-10-01), Bhatti et al.
patent: 7209727 (2007-04-01), Castaneda et al.
patent: 7218909 (2007-05-01), Rofougaran et al.
Carter Keith A.
Castaneda Jesus Alfonso
Rofougaran Ahmadreza (Reza)
Broadcom Corporation
Garlick Bruce E.
Garlick & Harrison & Markison
Owens Douglas W.
Tran Chuc
LandOfFree
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