Method for controlling antennas of mobile terminal device and such a mobile terminal device

Abstract

A method for controlling antennas of a mobile terminal device such as a laptop PC and a handheld PC without degrading communication speed or quality and a mobile terminal device having such control means are provided. The method comprises determining the usage of the mobile terminal device, determining an antenna to be disabled among the plurality of antennas according to the usage that is determined by the determining of usage, and disabling the antenna disabling of which is determined by determining of an antenna to be disabled, wherein the determining of usage determines usage based on the display orientation of the display unit of the mobile terminal device.

Description

CLAIM FOR PRIORITY [0001] This application claims priority from Japanese Patent Application No. 2005-164280, filed Jun. 3, 2005, and which is hereby incorporated by reference as if fully set forth herein. BACKGROUND OF THE INVENTION [0002] The present invention relates to a method for controlling the antennas of a mobile terminal device that has a plurality of antennas, for example. More particularly, the present invention relates to a method for controlling antennas in accordance with the usage of such a mobile terminal device and to such a mobile terminal device. [0003] In recent years, the effects of electromagnetic wave emitted from mobile terminal devices on the human body has been a subject of considerable interest, and technologies for reducing absorption of electromagnetic wave into the human body have become an issue in designing mobile terminal devices. For example, in the United States, a standard has been established that prescribes the acceptable value of Specific Absor...

AI Technical Summary

Benefits of technology

[0014] According to the method of the invention, antennas of a mobile terminal device can be controlled so as to reduce SAR on the human body without degrading communication speed or quality. For example, the method can control SAR adequately on a laptop PC or a handheld PC among others.

Problems solved by technology

In recent years, the effects of electromagnetic wave emitted from mobile terminal devices on the human body has been a subject of considerable interest, and technologies for reducing absorption of electromagnetic wave into the human body have become an issue in designing mobile terminal devices.

However, another issue arises when such a method is applied to a laptop PC or handheld PC, for example.

In addition, such a device has to be small in size for use as a mobile phone.

For those reasons, even if a terminal has a plurality of antennas, when the terminal is used in close contact with the human body such as for voice call, it could be difficult to reduce SAR unless, transmission output itself is reduced for any antenna at any position selected.

In this case, degradation of communication speed and quality of the mobile phone has to be accepted.

With these features, control could become too complex if the antenna control method for a mobile phone terminal device described above is applied to a laptop PC or a handheld PC without modification.

As a result, the mechanism of a mobile terminal device itself becomes complex and there would be more causes of trouble accordingly.

In addition, when an antenna with its output limited low is selected, communication speed or quality of the mobile terminal device degrades.

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