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Portable telephone

A portable phone and microphone technology, applied in the direction of circuit, electrical components, radio/inductive link selection arrangement, etc., can solve problems not mentioned, and achieve the goal of controlling dielectric constant, improving antenna efficiency, improving SAR and antenna efficiency Effect

Inactive Publication Date: 2005-04-13
FINE RUBBER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, JP-A2002-151881 does not mention a specific structure for reducing SAR while maintaining antenna efficiency

Method used

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  • Portable telephone
  • Portable telephone
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] Then, an example of a medium body applicable to a cellular phone will be described. As listed in Table 4 below, Examples 1-3 used silicone rubber as the base material and included graphite fibers and several additives. In the materials in the table below, graphite fibers and conductive carbon are mixed in the base material as conductive materials. Dry silica was mixed as an inductive material. Silicone oil and organic peroxide are used as softener and cross-linking agent respectively. Note that the portion with a weight of "0" indicates no additive.

[0058] Material

Example 1

Example 2

Example 3

Silicone Rubber

100

100

100

graphite fiber

100

50

50

conductive carbon

0

10

7

dry silica

0

0

3

silicone oil

10

10

10

Calcium oxide (CaO)

10

10

10

organic peroxide

0.5

0.5

0.5

relative dielectric

constant

(900M...

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PUM

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Abstract

A dielectric plate is attached to the inner surface of the casing of the cellular phone. The dielectric plate extends over the area between the user's head and the whip antenna of the portable phone. The real and imaginary parts of the relative permittivity of the dielectric plate are properly selected so that the dielectric plate can reduce SAR (Specific Absorption Rate) and improve antenna efficiency.

Description

technical field [0001] The present invention relates to a portable telephone. In particular, the present invention relates to a portable phone that can reduce the influence of electromagnetic waves on the human body and improve antenna efficiency. Background technique [0002] With the widespread use of portable phones, improvements in antenna efficiency and various electromagnetic wave effects in operation have been put on the agenda. In particular, regarding the influence on the human body, SAR (Specific Absorption Ratio) must be estimated. SAR represents the amount of electromagnetic absorption per unit time per unit mass of tissue when the human body is exposed to electromagnetic waves. As a device used near the head of a human body, such as a cellular phone, its partial SAR is under evaluation in Japan. The local SAR refers to the average SAR for a certain part of a fixed human body larger than 10 g, and it is stipulated in Japan that the local SAR should not exceed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/24H01Q17/00H04B1/38H04Q7/32
CPCH01Q1/245H04B1/3838
Inventor 高木和久古川裕子小山下雄治楠木慈土屋宗次
Owner FINE RUBBER RES INST CO LTD
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