Antenna device and mobile communications apparatus including...

Details Antenna device and mobile communications apparatus including... Antenna device and mobile communications apparatus including...

2002-02-13

2004-01-13

Clinger, James (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S825000, C343S856000

Reexamination Certificate

active

06677905

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an antenna device for a mobile communication apparatus such as a mobile phone, PHS, cordless handset, and mobile data communications device, and to a mobile communication apparatus including the antenna device.
BACKGROUND OF THE INVENTION
FIG.
21
and
FIG. 22
are perspective views of mobile communication apparatuses equipped with conventional antenna devices, respectively. Mobile communication apparatuses
100
and
102
are equipped with respective antenna devices
101
and
103
. The antenna device
101
is made from of a helical conductive wire, and the antenna device
102
is made from a linear conductive wire.
Since the conventional antenna device emits radio waves isotropically, about the device, a head of a user impedes the emitted radio waves when the user brings the mobile communication apparatus to his/her ear during using the apparatus. This reduces overall radiating efficiency of the device.
These conventional antenna devices are disclosed in the Japanese Laid-Open Patent Nos. 6-232622 and 10-313205.
SUMMARY OF THE INVENTION
An antenna device includes a radiator having a line length (L
1
) and a conductor having a line length (L
2
) smaller than the line length of the radiator. The conductor is disposed oppose to the radiator. Each line length satisfies the following formula:
L
1
=0.75&lgr;±0.2&lgr;;
and
L
2
=0.25&lgr;±0.2&lgr;,
where &lgr; is a wavelength of a signal applied to the radiator.


REFERENCES:
patent: 4259673 (1981-03-01), Guretzky
patent: 5406295 (1995-04-01), Baranski et al.
patent: 5995064 (1999-11-01), Yanagisawa et al.
patent: 6441791 (2002-08-01), Oka
patent: 6-232622 (1994-08-01), None
patent: 10-313205 (1998-11-01), None

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