Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2000-08-07
2002-03-26
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S895000, C343S725000
Reexamination Certificate
active
06362793
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna device and a portable radio set, and more particularly, is suitably applied to those such as a cellular telephone, etc.
2. Description of the Related Art
The cellular telephone of this type has been decreased in size and weight so far in order to improve the portability. Thereby, a retracting/pulling out type of whip antenna device is positively developed as an antenna device provided for a cellular telephone. There is a cellular telephone configured as shown in
FIGS. 1A and 1B
as the cellular telephone of the above type.
In case of a cellular telephone
1
having the above configuration, a retracting/pulling out type of whip antenna device
3
is provided for a housing
2
made of a non-conductive member such as synthetic resin.
The antenna device
3
has an antenna section
6
provided with a rod antenna
4
made of a conductive wire rod and a helical antenna
5
formed by helically winding a conductive wire rod. The antenna section is set so as to be freely retracted and pulled out along a direction in which the antenna section
6
is pushed into the housing
2
shown by an arrow a at the upper end
2
A of the housing
2
(this direction is hereafter referred to as retracting direction) and inversely, along a direction in which the section
6
is pulled out of the housing
2
(this direction is hereafter referred to as pull-out direction).
In the antenna section
6
, a first power-supply member
7
made of a conductive member and having a protrusion
7
A is electrically and mechanically connected to the lower end of the rod antenna
4
and a connecting portion
8
made of a non-conductive member is mechanically connected to the upper end of the rod antenna
4
.
Moreover, a second power-supply member
9
made of a conductive member is electrically and mechanically connected to the lower end of the helical antenna
5
and mechanically connected to the connecting portion
8
. Thereby, in the antenna section
6
, the rod antenna
4
and the helical antenna
5
are mechanically connected each other by the connecting portion
8
but they are electrically separated from each other.
Moreover, the rod antenna
4
is covered with an antenna cover for the rod
10
and the helical antenna
5
is stored in a cap-shaped antenna cover for the helical
11
so that the antennas
4
and
5
do not directly contact a user.
A circuit substrate (not illustrated) on which various circuit devices including a transmission-reception circuit
12
and a matching circuit
13
are mounted and a shielding case serving as a ground member made of a conductive member for covering the circuit substrate are stored in the housing
2
.
Moreover, an antenna power-supply terminal
14
made of a conductive member electrically connected to the matching circuit
13
is set inside of the upper end
2
A of the housing
2
and only either of the rod antenna
4
and helical antenna
5
is electrically connected to the antenna power-supply terminal
14
when the antenna section
6
is retracted or pulled out.
Actually, in the antenna device
3
, the antenna cover for the helical
11
is pushed in the retracting direction and made to contact the upper end
2
A of the housing
2
to push the rod antenna
4
into the housing
2
and retract the rod antenna
4
in the housing
2
and electrically connect the second power-supply member
9
to the antenna power-supply terminal
14
.
In addition, in this antenna device
3
, under this state, the transmission-reception circuit
12
supplies the helical antenna
5
with power sequentially via the matching circuit
13
, the antenna power supply terminal
14
and the second power supply member
9
so as to operate this helical antenna
5
as an antenna.
In addition, in this antenna device
3
, at this time the rod antenna
4
is electrically separated from the antenna power supply terminal
14
by the connection section
8
so that it will not operate as an antenna.
On the other hand, in the antenna device
3
, when the second antenna cover
11
is pulled in the direction to be pulled out under the state that the rod antenna
4
is retracted inside the housing
2
, the rod antenna
4
is pulled toward outside from the upend
2
A of this housing
2
and then the protrusion
7
A of the first power supply member
7
is thrust onto the antenna power supply terminal
14
to bring this first power supply member
7
into electrical connection with the antenna power supply terminal
14
.
In addition, in this antenna device
3
, the transmission-reception circuit
12
supplies the rod antenna
4
with power sequentially via the matching circuit
13
, the antenna power supply terminal, and the first power supply member
7
so as to operate this helical antenna
4
as an antenna.
Furthermore, in the antenna device
3
, by electrically separating the helical antenna
5
from the antenna power-supply terminal
14
by the connecting portion
8
, the antenna
5
is not operated as an antenna.
In this connection, to make the rod antenna
4
and helical antenna
5
operate as antennas, the impedances of the rod antenna
4
and helical antenna
5
are matched with the impedance of the unbalanced transmission line
16
by the matching circuit
13
.
Moreover, the shielding case functions as ground for various circuit devices and moreover functions as an electrical shielding plate for preventing radio waves of external noise and radio waves emitted from the antenna section
6
from entering various circuit devices mounted on a circuit substrate.
Thereby, the cellular telephone
1
makes it possible to, at the time of pulling out the antenna section
6
, transmit a transmission signal configured of a high-frequency signal from the transmission-reception circuit
12
to the rod antenna
4
through the matching circuit
13
, transmit the transmission signal to a base station (not illustrated) through the rod antenna
4
, and transmit a reception signal configured of a high-frequency signal transmitted from the base station and received by the rod antenna
4
to the transmission-reception circuit
12
through the matching circuit
13
.
Moreover, the cellular telephone
1
makes it possible to prevent the portability of the rod antenna
4
from damaging by retracting the antenna
4
in the housing
2
at the time of retracting the antenna section
6
, transmit a transmission signal from the transmission-reception circuit
12
to the helical antenna
5
through the matching circuit
13
under the above state, transmit the transmission signal to a base station through the helical antenna
5
, and transmit a reception signal transmitted from the base station and received by the helical antenna
5
to the transmission-reception circuit
12
through the matching circuit
13
.
Incidentally, in such a cellular telephone
1
, multi-path phasing could take place when signals transmitted from a base station are received. Thus, as such a cellular telephone there is the one that is provided with an antenna device of a diversity reception system.
Here,
FIG. 2
shows a basic configuration of the antenna device
15
of a diversity reception system, and for reception two antenna elements
16
and
17
, for example, are provided, and these antenna elements
16
and
17
are brought into electrical connection with the switch
20
via the matching circuits
18
and
19
respectively, and the switch
20
is electrically connected with the reception circuit (not shown).
In addition, in this antenna device
15
, the levels of the reception signals received by these two antenna elements
16
and
17
periodically are compared, and based on the result of this comparison, the switch
20
undergoes switch control to switch the antenna element
16
or
17
to be used for reception. Thus, the reception signal with a high level is selectively received so that multi-path phasing is reduced.
Incidentally,
FIG. 3A
as well as
3
B where the same symbols for parts as in
FIG. 1A
as well as
1
B corresponds each other shows a cellular te
Kanayama Yoshiki
Saito Yuichiro
Sawamura Masatoshi
Le Hoang-anh
Maioli Jay H.
Sony Corporation
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