JP2001244838A - Antenna system and portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the loss in a transmission line by shortening the line in a connector for an external antenna and an internal antenna. SOLUTION: The connector 6 for the external antenna and the internal antenna are united or disposed as closely as possible and switched by an electric switch 9 of mechanical switch 3 to perform transmission and reception between an RF circuit and the internal antennas 1 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone for switching between an internal antenna provided inside a device main body and an external antenna provided outside the device main body, and an antenna device used for these portable telephones. The present invention relates to an antenna device and a mobile phone in which connection means for connecting an external antenna are integrated.

[0002]

2. Description of the Related Art A mobile phone and an antenna device used for the mobile phone use an internal antenna provided in a housing of the mobile phone when used as a mobile phone, and a vehicle-mounted mobile phone when used as a mobile phone. Are using the external antenna. In this case, a conventional switching circuit for switching between the internal antenna and the external antenna is configured as shown in FIG.

In FIG. 6 (A), reference numeral 1 denotes an internal antenna which is disposed within a housing 7 of a mobile phone or is made to extend and contract outside the housing 7 of a mobile phone like a whip antenna. The internal antenna 1 is connected to an external antenna 4 attached to a car or the like via a transmission line 2 having a predetermined length, a mechanical switch 3 and a connector 6 for an external antenna such as a plug seat, and the mechanical switch 3 is connected to the internal antenna 1. And a high-frequency input / output circuit (hereinafter referred to as an RF circuit) 5 for transmitting and receiving via an external antenna 4.

In the above circuit configuration, when the plug of the external antenna 4 is not inserted into the external antenna connector 6, the contact of the mechanical switch 3 is closed and the path of the high-frequency signal is S.
Signal exchange is performed between the internal antenna 1 and RF circuit 5 as _one.

When the plug of the external antenna 4 is inserted into the external antenna connector 6, the contact of the mechanical switch 3 is opened and the internal antenna 1 is disconnected from the RF circuit 5,
Transmission and reception of the high-frequency signal S ₂ is performed between the external antenna 4 and the RF circuit 5.

FIG. 6B schematically shows the positional relationship between the components described in the circuit of FIG. 6A in a housing 7 for a portable telephone, Since the connector 6 is provided below the housing 7 and the internal antenna 1 is provided above the housing 7 like a whip antenna, when the frequency is as high as about 800 MHz like a mobile phone,
The influence of noise on the RF signal in the transmission line 2 between the internal antenna 1 and the external antenna connector 6 becomes a problem.

Further, since the mechanical switch 3 is integral with the external antenna connector 6, when the internal antenna 1 is selected, it must be passed through the external antenna connector 6, so that the transmission line (high-frequency cable) 2 and other components are required. In order to prevent the degree of freedom in the arrangement of parts from being reduced, a configuration in which a mechanical switch is an electric switch is disclosed in Japanese Patent Laid-Open No. 8-17 / 1996.
No. 2377.

The circuit configuration described in detail in the above publication is shown in FIG.
As shown in FIGS. 7A and 7B, the mechanical switch 3 is changed to an electric switch 9 and the electric switch 9 is changed.
A control circuit 8 for controlling the switching of the RF circuit 5 and the electrical switch near the internal antenna 1 provided above the housing 7 for the portable telephone as shown in FIG. 9 shows a mobile phone in which a control circuit 8 for controlling an electric switch 9 and a connector 6 for an external antenna are provided below a housing 7.

In the above configuration, the path of the high-frequency signal from the RF circuit 5 to the internal antenna 1 is shortened.
(A) and the internal antenna 1 to R shown in FIG.
Since the transmission line 2 to the F circuit 5 is shortened, the power loss of the high-frequency signal when the internal antenna is used is reduced, and the control circuit 8
The influence of the noise on the RF circuit 5 caused by the high-frequency signal from the RF circuit 5 can be reduced.

[0010]

Since the electric switch 9 is brought near the internal antenna in the portable telephone disclosed in the above-mentioned publication, the loss of the transmission line 2 between the internal antenna 1 and the RF circuit 5 is reduced. Electrical switch 9
And the external antenna 4 via the external antenna connector 6.
7B, the transmission line 2 from the electrical switch 9 to the external antenna connector 6 in FIG. 7B becomes long, and a power loss of a high-frequency signal occurs when the external antenna 4 transmits and receives.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an antenna device and a portable telephone which reduce power loss of a high-frequency signal even when an internal antenna and an external antenna are switched. .

[0012]

According to the first aspect of the present invention, there is provided an antenna device comprising a connecting means for enabling connection of an external antenna.
An internal antenna 1 which can be disposed in contact with at least a part of the connection means 6; a switching means 3, 9 for switching a signal to one of the external antenna 4 provided outside the device body 7 and the internal antenna 1; It is provided with.

The antenna device according to the second aspect of the present invention is the antenna device according to the first aspect, wherein the antenna device has the internal antenna 1 arranged so as to at least partially contact the outer periphery of the connection means 6 so as to surround the connection means 6. It is.

An antenna device according to a third aspect of the present invention is the antenna device according to the first and second aspects, wherein the connecting means is constituted by a plug 6, and the switching means is constituted by an electric or mechanical switch 3, 9. is there.

The portable telephone according to the first aspect of the present invention has a connection means 6 connectable to an external antenna 4 and an internal antenna provided in a portable telephone 7 which can be disposed in contact with a part of the connection means 6. 1, switching means 3 and 9 for switching the signal between the external antenna 4 and the internal antenna 1, and the internal antenna 1 and the external antenna 4 via the switching means 3 and 9.
And a high-frequency input / output means 5 for supplying or transmitting a transmission / reception signal to any of the above.

The portable telephone according to the second aspect of the present invention includes the internal antenna 1 of the first aspect, wherein the internal antenna is disposed so as to at least partially contact the outer periphery of the connection means 6 so as to surround the connection means 6. is there.

The portable telephone according to the third aspect of the present invention comprises the first and second portable telephones.
In the invention, the connecting means is constituted by the plug 6, and the switching means is constituted by the electric or mechanical switches 3 and 9.

According to the antenna device and the portable telephone of the present invention, the external antenna connector 6 and the internal antenna 1 are integrated, or the internal antenna 1 is disposed such that a part thereof is in contact with the outer periphery of the external antenna connector 6. The transmission line 2 from the internal antenna 1 to the external antenna connector 6
Can be shortened and the power loss when switching to the external antenna 4 can be reduced.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an antenna device and a portable telephone according to the present invention will be described with reference to FIGS.

FIGS. 1A and 1B show an example of the principle configuration of one embodiment of the antenna device and the portable telephone according to the present invention, and an explanation of the operation thereof. 1A and FIG. 1B, the internal antenna 1 is configured such that the internal antenna 1 is connected to the RF circuit 5 and the external antenna connector 6 via switching means such as a mechanical switch 3. Is connected to the plug seat.

FIG. 1A shows a state in which the internal antenna 1 in the housing 7 is selected, and the mechanical switch 3 is always closed when the internal antenna 1 is selected.
The transmission and reception of the high-frequency signal S ₁ is performed between the internal antenna 1 and the RF circuit 5.

FIG. 1B shows a case where the plug of the external antenna 4 is connected to the external antenna connector 6 in the antenna device of this embodiment. In this case, the contact of the mechanical switch 3 is opened and the system of the internal antenna 1 is opened. The road is turned off and the external antenna 4
And the RF circuit 5 are connected, and transmission and reception of the high-frequency signal S ₂ is performed between the external antenna 4 and the RF circuit 5.

FIGS. 2A and 2B show another embodiment of the antenna device according to the present invention, in which the internal antenna 1 and the external antenna connector 6 are integrated, and FIGS. In the configuration of 2 (B), the internal antenna 1 is an electric switch 9
Are connected to the RF circuit 5 and a plug seat such as the external antenna connector 6 via switching means.

The antenna device shown in FIG. 2A shows a state in which the internal antenna 1 in the housing 7 is selected, the electric switch 9 is controlled to be switched by the control circuit 8, and the contact piece a of the electric switch 9 is fixed. A high-frequency signal S ₁ is exchanged between the internal antenna 1 and the RF circuit 5 in contact with the contact b.

FIG. 2B shows a case in which a plug of an external antenna is connected to the external antenna connector 6 in the antenna device of this embodiment. In this case, the contact piece a of the electric switch 9 contacts the fixed contact c. is switching control by the control circuit 8, it is connected to an external antenna 4 and the RF circuit 5, transmission and reception of radio frequency signals S ₂ is performed between the external antenna 4 and the RF circuit 5.

3 (A) and 3 (B) are parts arrangement diagrams of a main part of the portable telephone of the present invention. FIG. 3 (A) shows an external antenna connector on the lower side of a portable telephone housing 7. The mechanical switch 3 is provided with a contact piece and a contact, which will be described later, integrated with the external antenna connector 6. The RF circuit 5 is arranged near the internal antenna 1 integrated with the external antenna connector 6.

FIG. 3B shows the switching means as an electric switch 9.
The control circuit 8 controls the switching of the contact piece a of the electric switch 9 to integrate the external antenna connector 6 and the internal antenna 1 and arrange them under the housing 7 for the mobile phone. The circuit 8 and the RF circuit 5 are arranged near the internal antenna 1 integrated with the external antenna connector 6.

According to the above configuration, FIGS. 6B and 7
The transmission line 2 described in (B) is eliminated, and the transmission line loss at this portion can be reduced.

FIGS. 4A and 4B show an embodiment of the structure of the antenna device of the present invention.

In FIG. 4A, reference numeral 10 denotes a board for a mobile phone, and a housing 7 for the mobile phone on which the board 10 is provided.
The external antenna connector 6 is fixed at a position corresponding to the lower side of the external antenna.

The internal antenna 1 is mounted so as to surround the external antenna connector 6. The internal antenna 1 solders the ends of right and left rising portions 13L and 13R formed by spirally winding a linear conductor such as a piano wire or phosphor bronze to a feeding portion 11 and a short-circuiting portion 12 provided on a substrate 10, and The open ends of the rising portions 13L and 13R are formed as zigzag meander portions 14 and the external antenna connector 6 is formed.
In this case, when the internal antenna 1 of 800 MHz is used, the diameter of the right and left rising portions 13L and 13R is 4 m.
m, the height of the rising portions 13L and 13R is 6 mm, the width of the zigzag portion of the meander portion 6 is 6 mm, and the length is 35 mm.

The plug seat (jack) 15 of the external antenna connector 6 has a mechanical switch structure as shown in FIG. 4B, and the contact pieces 16a and 16b are pressed by the spring 19 and are in contact with each other. The internal antenna 1 and the RF circuit 5 are connected.

When the plug 17 is inserted into the plug seat 15, the spring 19 is pressed by the tip of the plug 17, and the RF circuit 5 connected to the contact 16a is separated from the contact 16b. The external antenna 4 connected to the contact piece 16a and the plug 17 is connected.

In the above configuration, the external antenna connector 6
5A and 5B, the internal antenna 1 may be integrated with the external antenna connector 6 as shown in FIGS. 5A and 5B. Good.

FIGS. 5A and 5B show the left and right rising portions 13L and 13R of the internal antenna 6 and the meander portion 14 respectively.
Are integrally formed of a plate-like conductor or a linear conductor, and are embedded in the insulating member 19 of the external antenna connector 6 or are stuck on the insulating member 19 or patterned in a zigzag shape like a printed foil to form the right and left rising portions. 13L and 13R are integrally formed with pin portions 18L and 18R.
Since the 8L is connected to the feeding section 11 and the pin section 18R is connected to the short-circuit section 12 to form a half-wavelength loop antenna, a semiconductor switching transistor or the like can be connected to the feeding section 11 to form the electrical switch 9. it can.

[0036]

As described above, the antenna device and the portable telephone of the present invention have the external antenna connector 6 and the internal antenna 1 integrated or have the internal antenna 1 disposed so as to be in contact with the outer periphery of the external antenna connector 6 without limit. The transmission line loss between the external antenna connector 6 and the electrical switch 9 can be reduced, and the influence of noise can be reduced.
In addition, the integration reduces the number of components, facilitates mounting, and reduces the number of assembly steps.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of an antenna device according to the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the antenna device of the present invention.

FIG. 3 is a component layout diagram of the mobile phone of the present invention.

4A and 4B are a perspective view and a side cross-sectional view illustrating one embodiment of the antenna device of the present invention.

FIG. 5 is a perspective view showing another embodiment of the antenna device of the present invention.

FIG. 6 is a circuit diagram and component layout of a conventional antenna device and a mobile phone.

FIG. 7 is a circuit diagram and component layout of another conventional antenna device and a mobile phone.

[Explanation of symbols]

1 internal antenna, 2 transmission line, 3 mechanical switch, 5 RF circuit, 6 connector for external antenna, 7 housing for mobile phone, 8 control circuit, 9
‥ Electrical switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 1/21 H04M 1/74 5K067 1/74 H04B 7/26 C F term (Reference) 5J021 AA02 AA06 AA13 AB02 AB06 CA06 DB04 EA04 FA20 FA31 FA32 HA05 HA10 JA03 JA07 5J047 AA03 AA12 AB06 AB10 AB13 EF04 FD01 5K011 AA06 AA10 DA00 JA01 KA04 5K023 AA07 BB06 DD06 LL05 NN06 PP02 PP12 5K027 AA04 BB03 KK03 KK03 MM03 KK

Claims (6)

[Claims] An external antenna which can be connected to the external antenna; an internal antenna which can be disposed in contact with at least a part of the connecting means; and an external antenna provided outside a device body or the internal antenna. An antenna device comprising: switching means for switching a crab signal. 2. The antenna device according to claim 1, further comprising the internal antenna disposed so as to at least partially contact an outer periphery of the connection means so as to surround the connection means. 3. The antenna device according to claim 1, wherein said connecting means is constituted by a plug, and said switching means is constituted by an electric or mechanical switch. 4. A connection means connectable to an external antenna, an internal antenna provided in a mobile phone which can be disposed in contact with a part of the connection means, and any one of the external antenna and the internal antenna And a high-frequency input / output unit for supplying or transmitting a transmission / reception signal to one of the internal antenna and the external antenna via the switching unit. 5. The mobile phone according to claim 4, further comprising the internal antenna disposed so as to surround at least a part of the connection means so as to surround the connection means. 6. The portable telephone according to claim 4, wherein said connection means is constituted by a plug, and said switching means is constituted by an electric or mechanical switch.