Title:
ANTENNA MODULE-USE MAGNETIC CORE MEMBER, ANTENNA MODULE AND PORTABLE INFORMATION TERMINAL PROVIDED WITH IT
Document Type and Number:
WIPO Patent Application WO/2005/104298
Kind Code:
A1
Abstract:
An antenna module-use magnetic core member capable of improving a communication distance without increasing a module thickness, and an antenna module and a portable information terminal provided with this. An antenna module (1) comprising a sheet-formed magnetic core member (4) layered on a looped antenna coil-formed antenna substrate (2), wherein a magnetic core member (4) having a performance index, expressed by μ’ × Q, of 300 or higher is used when Q is a reciprocal of a loss factor (tan&dgr =μ’’/μ’) expressed by the real part μ’ and the imaginary part μ’’ of a complex permeability at a frequency used.
Inventors:
AKIHO HIRAKU
TAKAHASHI ISAO
SUGAWARA TOSHIAKI
YOKOTA TOSHIAKI
TAKAHASHI ISAO
SUGAWARA TOSHIAKI
YOKOTA TOSHIAKI
Application Number:
PCT/JP2005/008321
Publication Date:
November 03, 2005
Filing Date:
April 25, 2005
Export Citation:
Assignee:
SONY CORP (JP)
AKIHO HIRAKU
TAKAHASHI ISAO
SUGAWARA TOSHIAKI
YOKOTA TOSHIAKI
AKIHO HIRAKU
TAKAHASHI ISAO
SUGAWARA TOSHIAKI
YOKOTA TOSHIAKI
International Classes:
G06K19/07; G06K19/077; H01F1/37; H01F17/04; H01F1/34; H01Q1/24; H01Q7/06; (IPC1-7): H01Q7/06; G06K19/07; G06K19/077; H01Q1/24
Foreign References:
| JP2003017322A | 2003-01-17 | |||
| JPH11329818A | 1999-11-30 | |||
| JP2000090221A | 2000-03-31 | |||
| JPH0737711A | 1995-02-07 | |||
| JPH01106517A | 1989-04-24 | |||
| JP2000113142A | 2000-04-21 |
Other References:
See also references of EP 1744398A4
Attorney, Agent or Firm:
Nakamura, Tomoyuki c/o Miyoshi (International Patent Office Toranomon Kotohira
Tower, 2-8, Toranomon 1-chome, Minato-k, Tokyo 01, JP)
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