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Title:
PORTABLE TELEPHONE
Document Type and Number:
Japanese Patent JP2004153807
Kind Code:
A
Abstract:

To reduce the influence of electromagnetic waves to human body and increase antenna efficiency while maintaining lightweight and compactness of a portable telephone.

A dielectric sheet 15 is installed in the chassis internal wall of a portable telephone 2 that neighbors to a human head 3. The dielectric sheet 15 is installed in a state spread between a whip antenna 7 and the human head 3 and allows to reduce a SAR value by reducing electromagnetic wave energy that reaches to the human head 3. It allows to maintain high antenna efficiency even while reducing the SAR value and obtain a successful telephone conversation environment by selecting the values of the real part and the imaginary part of the specific inductive capacity of the dielectric sheet 15.


Inventors:
TAKAGI KAZUHISA
FURUKAWA HIROKO
KOYAMASHIMO YUJI
KUSUKI SHIGERU
TSUCHIYA SOJI
Application Number:
JP2003348690A
Publication Date:
May 27, 2004
Filing Date:
October 07, 2003
Export Citation:
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Assignee:
FINE RUBBER KENKYUSHO KK
International Classes:
H01Q17/00; H01Q1/24; H01Q1/52; H04B1/38; H04B1/3822; H04M1/02; (IPC1-7): H01Q1/52; H01Q1/24; H01Q17/00; H04B1/38; H04M1/02
Domestic Patent References:
JPH09255408A1997-09-30
JPH0521982A1993-01-29
JP2002217586A2002-08-02
JP2002374091A2002-12-26
JP2002232316A2002-08-16
JP2003133784A2003-05-09
JP2002180568A2002-06-26
Attorney, Agent or Firm:
Kazunori Kobayashi



 
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