Balun

Details Balun Balun

2006-12-14

2008-12-30

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S238000

Reexamination Certificate

active

07471167

ABSTRACT:
A balun capable of a reduced whole size. The balun includes an input line receiving an unbalanced signal, an output line receiving the unbalanced signal from the input line and outputting a balanced signal, and a ground part. The input and output lines are formed on a layer, and the ground part is formed on a different layer from the layer. The ground part includes an opening and is electrically connected to the input line, and a portion of the ground part is removed to form the opening so that a potential difference occurs between first and second output lines. Thus, although a length of the output line is less than ¼ of an input wavelength λ, a difference between phases of first and second output signals can be about 180°. As a result, the whole size of the balun can be reduced.

REFERENCES:
patent: 3976959 (1976-08-01), Gaspari
patent: 4240052 (1980-12-01), Hallford et al.
patent: 4755775 (1988-07-01), Marczewski et al.
patent: 5304959 (1994-04-01), Wisherd et al.
patent: 5594393 (1997-01-01), Bischof
patent: H1959 (2001-05-01), Kikel

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