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Title:
ELECTROMAGNETIC WAVE ABSORBING SHEET
Document Type and Number:
Japanese Patent JP2006179901
Kind Code:
A
Abstract:

To provide an electromagnetic wave absorbing sheet having excellent permeability at high frequencies.

An electromagnetic wave absorbing sheet 1 comprises a soft magnetic layer 10 having an insulating film on its surface and formed so as to have a predetermined thickness by laminating flat soft magnetic metal powder having a thickness of 0.1 to 1 μm in the direction of the thickness, and an electrically insulating layer 20 covering the surface of the soft magnetic layer 10. It is preferable for the soft magnetic layer 10 to have a space factor of 75% or more for the flat soft magnetic metal powder and oriented in substantially the fixed direction. Further, it is preferable for the thickness of the soft magnetic layer 10 to be 5 to 100 μm, and for the thickness of the electrically insulating layer 20 to be equal to or less than 50 μm. Furthermore, it is preferable for the thickness of the flat soft magnetic metal power to be 0.1 to 1 μm.


Inventors:
WAKAYAMA KATSUHIKO
CHO TSUTOMU
KARATSU SHINKO
HASHIMOTO YASUO
Application Number:
JP2005359734A
Publication Date:
July 06, 2006
Filing Date:
December 14, 2005
Export Citation:
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Assignee:
TDK CORP
International Classes:
H05K9/00; H01F1/00; H01F1/44; H01Q17/00
Domestic Patent References:
JPH10144512A1998-05-29
JP2002198684A2002-07-12
JP2001308584A2001-11-02
JP2001332411A2001-11-30
JPH07326508A1995-12-12
JPH1056292A1998-02-24
JPH1145804A1999-02-16
Attorney, Agent or Firm:
Mitsuru Oba
Horikawa Miyuki