Common-mode choke coil

Details Common-mode choke coil Common-mode choke coil

2006-08-15

2006-08-15

Nguyen, Tuyen T (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

Reexamination Certificate

active

07091816

ABSTRACT:
A common-mode choke coil comprises an insulating layer and first and second coil conductors. The first and second coil conductors are laminated with the insulating layer interposed therebetween and are magnetically coupled to each other. A width W (mm) and a length L (mm) of at least one coil conductor in the first and second coil conductors satisfy the relational expression of:in-line-formulae description="In-line Formulae" end="lead"?√{square root over (L/W)}<(7.6651−fc)/0.1385in-line-formulae description="In-line Formulae" end="tail"?where fc (MHz) is the cutoff frequency with respect to differential-mode noise.

REFERENCES:
patent: 6710694 (2004-03-01), Matsuta et al.
patent: 6992556 (2006-01-01), Tada et al.
patent: 7002446 (2006-02-01), Ito et al.
patent: 2004/0263309 (2004-12-01), Ito et al.
patent: A 6-215951 (1994-08-01), None
patent: A 6-275439 (1994-09-01), None
patent: A 203737 (1996-08-01), None
patent: A 11-54326 (1999-02-01), None

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