Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2001-08-07
2003-04-22
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S901000
Reexamination Certificate
active
06552688
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an antenna device adapted for use with a portable wireless device of which a cellular phone is a representative example, and a portable wireless device.
BACKGROUND ART
A conventional example of an antenna device used in a portable wireless device of which a cellular phone is a representative example is arranged on the top of a housing and adapted to be withdrawn therefrom. This type of antenna device displays excellent antenna characteristics and is adapted for use as a portable unit since the antenna device can be stored in the housing when not in use and withdrawn from the housing when in use.
FIG. 10
is a rear view showing the structure of a cellular phone using a conventional antenna device. The conventional antenna device is provided for example on the left side of the cellular phone when viewed from the rear surface of the cellular phone. The antenna device is provided with a tubular excitation antenna
90
and a columnar helical antenna
91
. The excitation antenna
90
is fixed to an antenna mounting section
92
a
which is a section of the housing
92
. The helical antenna
91
can displace in an interior space of the excitation antenna
90
along an axial direction A. An antenna support shaft
93
is mounted on the lower end of the helical antenna
91
. The antenna support shaft
93
is supported in a predetermined position by a holder
94
which is fixed to the housing
92
.
In this manner, the antenna device has two antenna components of the excitation antenna
90
and the helical antenna
91
and each antenna is mounted on the housing
92
at respectively different positions. That is to say, the excitation antenna
90
is supported by the antenna mounting section
92
a
and the helical antenna
91
is supported by the holder
94
. Therefore, the operation of the antenna device can not be confirmed until after attaching the antenna device to the housing. That is to say, it is not possible to confirm the operation of the antenna device independently.
The helical antenna
91
can be stored in a storage position as shown by the broken line in
FIG. 10
from the position shown by the two-dot chain line. Furthermore, the helical antenna
91
can be drawn out from the storage position to the position shown by the two-dot chain line. In this time, the antenna support shaft
93
displaces together with the displacement of the helical antenna
91
. Thus, when the helical antenna
91
is stored in the storage position, the antenna support shaft
93
extends below the excitation antenna
90
.
As a result, in the conventional antenna device, a region directly below the excitation antenna
90
must be provided as a displacement region for the antenna support shaft
93
. In other words, the displacement region for the antenna support shaft
93
splits the storage region for the battery pack
95
attached to the rear surface of the cellular phone. Thus, the problem has arisen that increases in the capacity of the rechargeable battery
96
are limited as a result of limitations on the size of the rechargeable battery
96
mounted in the battery pack
95
.
FIG. 11
is a cross sectional view showing the internal structure of a cellular phone using the conventional antenna device as viewed from the bottom side thereof. As clearly shown in
FIG. 11
, the designated region for the rechargeable battery
96
avoids a displacement region for the antenna support shaft
93
in order to maintain the displacement region for the antenna support shaft
93
. As a result, difficulties in increasing the capacity of the chargeable battery
96
have been encountered. This problem is particularly conspicuous with respect to antenna devices used in a satellite cellular phone which consumes relatively large amount of electrical power.
The present invention is proposed to solve the above problems and has the object of providing an antenna device which is adapted for use with a portable wireless device and which allows confirmation of the operation independently.
The present invention has the further object of providing a portable wireless device which can use the above antenna device even when a displacement region for a moveable antenna is not provided directly below the antenna device.
DISCLOSURE OF THE INVENTION
In order to achieve the above objects, an antenna device of the present invention comprises a first cylindrical antenna and a second cylindrical antenna which is fittingly inserted into the first antenna to allow displacement and electrical connection to the first antenna. A shaft which extends along a displacement direction of the second antenna is provided in an internal space of the first antenna. An antenna retaining section is provided at a fixed position on the shaft in order to retain the second antenna to a fixed displacement position.
According to the present invention, the shaft is arranged in an internal space of the first antenna and the second antenna can displace along the shaft. Thus, it is possible to integrate these antenna devices into a single unit. As a result, it is possible to confirm operation of the antenna device independently before mounting the antenna device onto the housing of the portable wireless device.
Furthermore, the second antenna displaces along the shaft provided in the internal space of the first antenna. Therefore, even when the second antenna is stored in a storage position, it is not necessary to maintain a displacement region for components related to the antenna in the region directly below the first antenna. As a result, when the antenna device is used in a portable wireless device, it is possible to use the region directly below the first antenna as a part of the designated region for the rechargeable battery. Thus, the capacity of the rechargeable battery can be increased.
REFERENCES:
patent: 5243355 (1993-09-01), Emmert et al.
patent: 5583519 (1996-12-01), Koike
patent: 5757337 (1998-05-01), Hsueh et al.
patent: 5949377 (1999-09-01), Matsumoto et al.
patent: 6034639 (2000-03-01), Rawlins et al.
patent: 6288681 (2001-09-01), Kim et al.
patent: 0 372 720 (1990-06-01), None
patent: 9-260923 (1997-10-01), None
patent: 11-112219 (1999-04-01), None
Patent Abstracts of Japan, JP 09-148826, Jun. 6, 1997.
Le Hoang-anh
Mitsubishi Denki & Kabushiki Kaisha
LandOfFree
Antenna and mobile radio unit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna and mobile radio unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna and mobile radio unit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3067898