Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
1999-11-22
2001-06-12
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S895000
Reexamination Certificate
active
06246373
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device, in particular, it relates to one capable of having good communication even in the case the antenna characteristic is deteriorated due to the influence of a human body on the antenna.
Japanese Patent Application 10-160026, which was filed by the present inventor, discloses “antenna devices comprising a fixed (retractable) antenna provided with a shield case in a housing, comprising a conductor element conductive with the shield case inside the housing so that the antenna gain is improved by the conductor element”. Among them, an antenna device comprising a fixed antenna provided with a shield case inside a housing will be explained with reference to
FIGS. 5A and 5B
.
The antenna device shown in
FIGS. 5A and 5B
are a partial view of the part in the vicinity of the antenna device of a portable radio terminal device, such as PHS.
FIG. 5A
is a plan view of the rear side of the portable radio terminal device, and
FIG. 5B
is a side view thereof. In
FIGS. 5A and 5B
, the antenna device comprises a fixed antenna having a helical part
11
provided with an helical antenna element functioning as a radiation element in an antenna cover, and a connection part
12
provided in a housing
14
, to be connected with the helical antenna element of the helical element part, a high frequency feeder part having a matching circuit part
16
provided in the housing
14
, to be connected via a feeder piece
15
to be a feeding point
13
of the antenna, and a radio circuit part
20
to be connected with the matching circuit part
16
, a shield case
19
for shielding a radiated unnecessary electromagnetic wave, and a conductor element
17
to be connected with the shield case at a contact part
18
.
The conductor element
17
provided inside the housing
14
is connected with the ground of the radio circuit part
20
via the contact part
18
and the shield case
19
such that the ground electric current dispersed in the shield case
19
and the radio circuit part
20
is gathered so as to serve as a radiation element.
The matching circuit part
16
matches the impedance between the radio circuit part
20
and a radiation element comprising the helical element part
11
and the conductor element
15
for transmitting the electric power from the radio circuit part
20
to the radiation element without reflection.
The conductor element
17
has a comb teeth-like shape, with one of the comb teeth bent such that the connection part
12
of the fixed antenna is accommodated in the bent part. The radio circuit part
20
is disposed in the shield case
19
.
As mentioned above, the antenna device of the prior application provided with a conductor element conductive with the shield case inside the housing for improving the antenna gain by the conductor element gave rise to a problem in that a step for the conductance with other electric devices is required as well as it is difficult to secure the space for accommodating the conductor element in view of the trend of downsizing of the device.
SUMMARY OF THE INVENTION
Accordingly, an object of the invention is to provide an antenna device capable of securing the space for accommodating a conductor element in view of the trend of downsizing of the device, without requiring the step for the conductance with other electric devices (antenna, shield case).
In order to solve the problems, in the invention, an antenna feeder part comes in contact with a feeding spring at the time of contraction so that a helical part can function as an antenna as well as a conductor element is provided elongating along an antenna storage part in the space in the housing for capacitive coupling with the antenna feeder part so that the antenna gain is improved by the conductor element.
Accordingly, even when the radiation of the helical part is restrained by the influence of a human head part, in particular, of an earlobe, since the conductor element is the radiation source, it is easy to secure the space as well as a step for the conductance with other electric devices is not required, and restraint of the radiation by the human head part can be alleviated for the antenna device as a whole so that the antenna gain can be improved.
Since a first aspect of the invention is an antenna device comprising a retractable antenna provided with a shield case in a housing, wherein an antenna feeder part comes in contact with a feeding spring at the time of contraction so that a helical part can function as an antenna as well as a conductor element is provided elongating along an antenna storage part in the space in the housing for capacitive coupling with the antenna feeder part so that the antenna gain is improved by the conductor element, it is advantageous in that it is easy to secure the space as well as a step for the conductance with other electric devices is not required, and restraint of the radiation by the human head part can be alleviated for the antenna device as a whole so that the antenna gain can be improved.
Moreover, since a second aspect of the invention is the antenna device according to the first aspect, wherein the conductor element is disposed with a three-dimensional shape along the antenna storage part for allowing further capacitive coupling with the antenna feeder part, it is advantageous in that it is easy to secure the space as well as a step for the conductance with other electric devices is not required, and restraint of the radiation by the human head part can be alleviated for the antenna device as a whole so that the antenna gain can be improved.
Furthermore, since a third aspect of the invention is an antenna device comprising a fixed antenna provided with a shield case in a housing, wherein an antenna feeder part contacts with a feeding spring so that a helical part can function as an antenna as well as a conductor element is provided elongating along a prolongation of the antenna feeder part in the space in the housing for capacitive coupling with the antenna feeder part so that the antenna gain is improved by the conductor element, it is advantageous in that it is easy to secure the space as well as a step for the conductance with other electric devices is not required, and restraint of the radiation by the human head part can be alleviated for the antenna device as a whole so that the antenna gain can be improved.
Moreover, since a fourth aspect of the invention is the antenna device according to the third aspect, wherein the conductor element is disposed with a three-dimensional shape along the antenna storage part for allowing further capacitive coupling with the antenna feeder part, it is advantageous in that it is easy to secure the space as well as a step for the conductance with other electric devices is not required, and restraint of the radiation by the human head part can be alleviated for the antenna device as a whole so that the antenna gain can be improved.
Furthermore, since a fifth aspect of the invention is portable radio terminal device comprising the antenna device according to the first aspect or the third aspect, it is advantageous in that the antenna gain can be improved in the portable radio terminal device.
Moreover, since a sixth aspect of the invention is a portable radio phone device comprising the antenna device according to the first aspect or the third aspect, it is advantageous in that the antenna gain can be improved in the portable radio phone device.
REFERENCES:
patent: 5317325 (1994-05-01), Bottomley
patent: 5467096 (1995-11-01), Takamoro et al.
patent: 5856808 (1999-01-01), Holshouser et al.
patent: 5969684 (1999-10-01), Oh et al.
Le Hoang-anh
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
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