Title:
コモンモードフィルタ
Document Type and Number:
Japanese Patent JP4683071
Kind Code:
B2
Abstract:
A common mode filter is provided as one in a three-layered structure with improved high-frequency characteristics. The common mode filter 1 has the three-layered structure including a first coil layer 14, a second coil layer 18, and a lead layer 16. A first planar coil 21 and a second planar coil 41 of a substantially circular spiral shape are formed in the first and second coil layers 14, 18, respectively. A first lead wire 31 and a second lead wire 32 formed in a lead layer 16 have a first straight portion 31c and a second straight portion 32c, respectively. The first straight portion 31c is located on a straight line L1 perpendicular to a plurality of first tangent lines to spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42. The second straight portion 32c is located on a straight line L2 perpendicular to a plurality of second tangent lines to the spirals 22, 42 at a plurality of respective intersection points with the spirals 22, 42.
Inventors:
Tominaga Nishikawa
Tomokazu Ito
Takeshi Okumura
Makoto Yoshida
Kamiyama Hiroshi
Akira Nakagome
Kenya Karame
Tomokazu Ito
Takeshi Okumura
Makoto Yoshida
Kamiyama Hiroshi
Akira Nakagome
Kenya Karame
Application Number:
JP2008129983A
Publication Date:
May 11, 2011
Filing Date:
May 16, 2008
Export Citation:
Assignee:
tdk Corporation
International Classes:
H01F17/00; H01F19/04
Domestic Patent References:
| JP2006147615A | ||||
| JP2007123424A | ||||
| JP2000252125A | ||||
| JP3007413A | ||||
| JP2005158920A | ||||
| JP2000223315A |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka