3-line balun transformer

Details 3-line balun transformer 3-line balun transformer

2005-07-05

2005-07-05

Mai, Anh (Department: 2832)

Inductor devices

Coils of special configuration

Planar type

C336S223000, C333S032000

Reexamination Certificate

active

06914512

ABSTRACT:
A 3-line balun transformer includes an unbalanced port for an unbalanced signal, first and second balanced ports for balanced signals, the balanced signals being the same in level and 180 degrees out of phase with each other, a first line having its first end connected to the unbalanced port and its second end connected to ground, a second line arranged in parallel with the first line while being spaced apart from the first line, the second line having its first end and its second end connected to the first balanced port, and a third line arranged in parallel with the second line while being spaced apart from the second, the third line having its first end connected to the first end of the second line and its second end connected to the second balanced port.

REFERENCES:
patent: 5497137 (1996-03-01), Fujiki
patent: 6018277 (2000-01-01), Väisänen
patent: 6040745 (2000-03-01), Tanaka et al.
patent: 6140886 (2000-10-01), Fratti et al.
patent: 6285273 (2001-09-01), Morikawa
patent: 6294965 (2001-09-01), Merrill et al.
patent: 6483415 (2002-11-01), Tang
Patent Abstracts of Japan—Publication No. 03-254204, Published Nov. 13, 1991.
Patent Abstracts of Japan—Publication No. 07-183127, Published Jul. 21, 1995.
Cho, Choonsik, K. C. Gupta. “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, pp. 2514-2519.

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