JP2001339221A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal device equipped with an antenna which does not spoil the beauty of the outward appearance and is reduced in cost and usable even as a strap for portage or fixation although the performance is high. SOLUTION: This device is composed of a conductor and a connector which is connected thereto and a mechanically flexible antenna is used as at least part of the conductor. The conductor constituting the antenna is in a Y shape having two branches and common use for two frequency bands may be made possible by the branching conductors which differ in length. Further, the antenna may be used in common as the strap for portage or fixation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna-based device having an antenna for receiving radio waves, and more particularly to an antenna suitable for mobile communication and a portable terminal device having the antenna.

[0002]

2. Description of the Related Art Conventionally, terminals such as mobile phones include telescopic monopole antennas and fixed helical antennas. For miniaturization, dielectric antennas mounted on a circuit board inside the terminal have been used. An inverted-F type antenna with a built-in terminal is used for diversity.

One conventional example will be described with reference to FIG.
FIG. 5 shows the main body of the portable terminal and its external antenna. FIG. 5A is a diagram showing a state in which the rod antenna 51 is used, and FIG.
FIG. 3 is a diagram in a state where a helical antenna 52 is used.
Further, there is an antenna having an external structure as shown in FIG. 5B, which uses a fixed antenna used without being expanded or contracted.

[0004]

[0005] Each of these antennas has its own characteristics. However, basic characteristics of the antenna, such as gain, directivity, and sharing of a plurality of frequencies (for example, dual frequency sharing) are used. In addition, it is very difficult to satisfy all of the requirements, such as size, manufacturing cost, and aesthetics as a product.

Specifically, radio waves conventionally used for mobile communication such as mobile phones are vertically polarized waves. However, in the case of an antenna fixed to a mobile terminal, transmission / reception sensitivity may be deteriorated if the terminal is tilted in a specific direction depending on the usage state.

In order to solve such a problem,
In some cases, an isotropic antenna with little antenna directivity is used. However, in this case, there has been a problem that gain is reduced by suppressing the directivity of the antenna, and that directivity control is difficult in antenna design.

Further, as an external antenna of the terminal, a monopole antenna which can be generally stored, a miniature antenna thereof, or a helical antenna which is covered with a small cylindrical resin case, for example, is used. There are, but
In any case, the antenna portion is protruding, and there is inconvenience such that the protrusion hinders storage or the like.

[0008] Accordingly, an object of the present invention is to provide a high-performance antenna-using device which can be used as a portable or fixed strap at low cost without deteriorating the aesthetics of the device. Is to provide.

[0009]

Therefore, in the present invention, a conductive wire and a connector connected thereto are used, and at least a part of the conductive wire uses an antenna having mechanical flexibility.

[0010] Further, a part of or the whole of the conductor constituting the antenna is formed in a chain shape, and the chain-shaped conductors are electrically connected sequentially.

The conductor constituting the antenna is formed on the surface or inside of a base made of an insulator.

Further, the conductor constituting the antenna has a Y-shape which is bifurcated, and can be shared in two frequency bands by the branched conductors having different lengths.

Further, a portable terminal device used for mobile communication using the antenna can be obtained.

The antenna has a function to be used commonly as a portable or fixed strap.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) are schematic perspective views of an antenna 1 comprising a conducting wire 11 and a power supply connection portion 12 when the antenna 1 is attached to a telephone body 13. FIG. In the figure, the conducting wire 11 is flexible as a whole, and the tip portion 14 always hangs down by its own weight. In addition, the power supply connection unit 1
Reference numeral 2 denotes an end which is attached to the telephone body 13 by a connection screw 15 and is connected to an internal power supply circuit via the end.

In particular, FIG. 1B is an enlarged perspective view of the vicinity of a connection portion between the telephone body 13 and the antenna 1, and FIG.
(c) is an enlarged sectional view of the main part.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2A is a schematic perspective view when the antenna 2 including a chain of conducting wires 21 and a power supply connection portion 22 is attached to the telephone main body 23. In the figure, a leading end 24 made of a chain of conductive wires 21 and an insulator has flexibility as a whole and always hangs down by its own weight.

Although the length of the conductor 21 is determined by the frequency used, the substantial length of the antenna 2 can be adjusted by the attachment and detachment of each chain by the tip 24 made of an insulator. The power supply connection portion 22 has a distal end attached to the telephone main body 23 by a connection screw 25, and is connected to an internal power supply circuit via this.

FIG. 2B shows the telephone body 23 and the antenna 2.
It is the perspective view which expanded the vicinity of the connection part with this.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3A shows an insulating strap 34.
FIG. 3 is a schematic perspective view when an antenna 3 composed of a conducting wire 31 formed in an upper part thereof and a power supply connection portion 32 is attached to a telephone body 33. In the figure, a conductor 31
And the strap 34 is flexible as a whole and always hangs down by its own weight. In addition, the power supply connection unit 32
Has a front end attached to the telephone body 33 by a connection screw 35, and is connected to an internal power supply circuit via this. FIG. 3B shows the telephone body 33 and the antenna 3.
FIG. 4 is a perspective view of the antenna 3 in which a connection portion with the antenna 3 is emphasized.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIGS. 4A and 4B show an antenna 4 composed of a conducting wire 41 and a power supply connecting portion 42 formed on a part of a strap 44 made of an insulating material and having an annular shape.
Is a schematic perspective view when is attached to the telephone body 43. FIG. In the figure, a conductor 41 and a strap 44
Is flexible in its entirety and always hangs down under its own weight. The power supply connection portion 42 has a connection screw 4 at the tip.
5 is attached to the telephone main body 43, and is connected to an internal power supply circuit via this. FIG. 4 (b)
2 is a perspective view showing the structure of the antenna 4. FIG. Further, FIG.
(c) is a plan view showing the pattern of the conductive wire 41 in an easy-to-understand manner by developing the strap 44 portion.

The conductor 41 has a common part 46 connected to the power supply connection part 42, a part 47 branched from the common part 46 into a T-type or a Y-type for use in a first use frequency band, and a second part 46.
And a portion 48 used for the used frequency band.

As described above, the characteristics of the antennas according to the first to fourth embodiments are shown in the case where the telephone main body is set upright (tilt 0 deg) and when the telephone main body is tilted 30 to 90 deg. The relative gain of the vertically polarized wave was measured, and is shown in Table 1 together with the antenna (when extended) shown in the conventional example. Note that in the fourth embodiment,
Because two frequencies are shared, in Table 1, f _{L at the} low operating frequency and f _{L at} the high operating frequency are used.
_H. Further, the value of the relative gain was represented by a relative gain unit dBd based on the gain of the dipole antenna.

[0025]

[Table 1]

As shown in Table 1, according to the present invention, any of the embodiments shows good gain characteristics regardless of the inclination of the telephone body.

In addition to the radiation characteristics of the antenna, the conductor constituting the antenna is not particularly limited as long as it has a sufficiently low resistance, and even if it is wrapped in an insulating material. Alternatively, it may be formed on a flexible insulating substrate by printing, etching, or the like, or may be formed from a chain of conductive wires, or may be a combination thereof.

In the above embodiment, the case of a portable telephone has been described. However, the present invention is similarly applicable to other portable or mobile communication terminal devices.

[0029]

As described above, the portable terminal device according to the present invention exhibits good gain characteristics regardless of the inclination of the device during use.

Further, the antenna according to the present invention is a strap type antenna of a portable terminal device, a decorative antenna can be easily realized, and the antenna can be easily attached and detached by a connector such as a screw. There is also the convenience of being able to change freely.

The antenna according to the present invention has a very advantageous structure in terms of the adjustment of characteristics and the degree of freedom in design depending on the type and shape of the conductor of the antenna.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a mobile phone according to a first embodiment of the present invention. FIG. 1A is a perspective view showing the entire mobile phone, FIG. 1B is an enlarged perspective view showing the vicinity of a connection portion between the antenna and the phone body, and FIG. 1C is a main view of the connection portion. It is an expanded sectional view which shows a part.

FIG. 2 is a schematic perspective view showing a mobile phone according to a second embodiment of the present invention. FIG. 2A is a perspective view showing the entire mobile phone, and FIG. 2B is an enlarged perspective view showing the vicinity of a connection portion between the antenna and the phone body.

FIG. 3 is a schematic perspective view showing a mobile phone according to a third embodiment of the present invention. FIG. 3A is a perspective view showing the entire mobile phone, and FIG. 3B is an enlarged perspective view showing the vicinity of a connection portion between the antenna and the phone main body.

FIG. 4 is a schematic perspective view showing a mobile phone according to a fourth embodiment of the present invention. FIG. 4A is a perspective view showing the entire mobile phone, FIG. 4B is an enlarged perspective view showing the vicinity of a connection portion of the antenna with the phone main body, and FIG. FIG. 4 is a development view showing a conductor pattern of FIG.

FIG. 5 is a schematic perspective view showing a mobile phone having a conventional antenna. FIG. 5A is a diagram illustrating a state where the rod antenna is extended, and FIG. 5B is a diagram illustrating a state where the rod antenna is housed.

[Explanation of symbols]

 1, 2, 3, 4, 5 Antenna 11, 21, 31, 41 Conductor 12, 22, 32, 42 Feeding connection part 13, 23, 33, 43 Telephone body 14 Tip part 15, 25, 35, 45 Screw 24 Tip Insulating parts 34, 44 Strap part 46 Common conductor part 47 First frequency band conductor part 48 Second frequency band conductor part 51 Rod antenna 52 Helical antenna

Claims (6)

[Claims] 1. An antenna comprising a conductor and a connector connected to the conductor, wherein at least a part of the conductor has mechanical flexibility. 2. The antenna according to claim 1, wherein a part of or a whole of a conductor portion forming the antenna has a chain shape, and the chain conductors are sequentially electrically connected. . 3. The antenna according to claim 1, wherein the conductive wire portion constituting the antenna is formed on a surface or inside of a base material made of an insulator. 4. The device according to claim 1, wherein the conductor portion has a Y-shape that is bifurcated, and can be shared in two frequency bands by the branched conductors having different lengths. antenna. 5. A portable terminal device comprising the antenna according to claim 1 and used for mobile communication. 6. A portable terminal device provided with the antenna according to claim 1, which can be used as a portable or fixed strap.