Balun

Details Balun Balun

2006-12-09

2009-06-02

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S025000

Reexamination Certificate

active

07541887

ABSTRACT:
A balun includes a first transforming part (30) and a second transforming part (40). The first transforming part includes a first coupled line (32), a first transmission line (34), a second transmission line (36), and a first capacitor (C1). The first transmission line includes a first balanced port (2). The second transmission line includes a second balanced port (3). The first capacitor connects the first balanced port and the second balanced port. The second transforming part includes a second coupled line (42), a third transmission line (44), a first line node (48), a second capacitor (C2), a fourth transmission line (46), a second line node (49), and a third capacitor (C3). The third transmission line includes an unbalanced port (1). The second capacitor connects the third transmission line and the first line node. The third capacitor connects the fourth transmission line and the second line node.

REFERENCES:
patent: 5949299 (1999-09-01), Harada
patent: 6437658 (2002-08-01), Apel et al.
patent: 6567658 (2003-05-01), Van De Graaf
patent: 6954116 (2005-10-01), Nosaka
patent: 6998930 (2006-02-01), Tabatchnick et al.
patent: 2004/0164817 (2004-08-01), Nosaka
patent: 2005-244000 (2005-08-01), None
patent: 2005-244000 (2005-09-01), None
B.P. Kumar et al., Optimized Design of Unique Miniaturized Planar Baluns for Wireless Applications, Feb. 2003, IEEE Microwave and Wireless compoenents Letters, vol. 13 No. 2, 134-136.
Kumar, et al., Optimized Design of Unique Miniaturized Planar Balums for Wireless Applications, IEEE Microwave and Wireless Componenets Letters, vol. 13, No. 2, Feb. 2003.

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