System method and apparatus for a three-line balun with...

Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits

Reexamination Certificate

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C336S232000, C343S821000

Reexamination Certificate

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06982609

ABSTRACT:
A balun that includes a first conductor, a second conductor and a third conductor. The first conductor has a length of about one quarter wavelength of a selected center frequency. The first conductor also has a first end connected to a first balanced power amplifier output port. The second conductor has a length of about one quarter wavelength of the selected center frequency. The second conductor also includes a first end connected to a second balanced power amplifier output port and a second end connected a second end of the first conductor. The third conductor has a length of about one quarter wavelength of the selected center frequency. The third conductor has a first end connected to an antenna port and a second end connected to a ground potential.

REFERENCES:
patent: 5172082 (1992-12-01), Livingston et al.
patent: 5867072 (1999-02-01), Logothetis
patent: 6040745 (2000-03-01), Tanaka et al.
patent: 6278340 (2001-08-01), Liu
patent: 6844792 (2005-01-01), Koeppe et al.
patent: 2002/0034934 (2002-03-01), Watanabe et al.
Choonsik Cho, “A New Design Procedure for Single-Layer and Two-Layer Three-Line Baluns”, IEEE Transactions On Microwave Theory And Techniques, vol. 46, No. 12, Dec. 1998.

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