JPH07177561A - Portable telephone set - Google Patents

Abstract

PURPOSE:To reduce noise by mounting a reflector holder to an antenna so as to direct the direction with high directivity of the portable telephone set to the direction of a base station being a radio wave sender or a master set. CONSTITUTION:The telephone set is provided with a reflector 10 made of a metallic wire such as a copper wire and a reflector holder 11 with the reflector 10 mounted thereon and made of a plastic or an ABS resin or the like, and the reflector holder 11 has a cylinder 12 so as to be mounted to a projection of a helical antenna 2. When noise is generated during the communication by a portable telephone set main body 1, the reflector holder 11 is mounted to the helical antenna 2 and directivity is provided to the portable telephone set main body 1. As to a horizontal plane of the directivity especially, a reception level in a direction of the reflector 10 gets lower when viewing from the helical antenna 2 and the reception power level gets higher in a direction opposite thereto. That is, the combined characteristic of the antenna 2 and the reflector 10 has a directivity to the horizontal plane by mounting the reflector holder 11 to the antenna 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone including a cordless phone that transmits and receives radio waves with an antenna.

[0002]

2. Description of the Related Art FIG. 21 is an external view of a conventional mobile phone, FIG.
2 is a simplified block diagram of the mobile phone, and FIG. 23 is a diagram showing the directivity of an antenna mounted on the mobile phone.
Is a diagram showing a positional relationship between the antenna and the XYZ axes,
(B) is a figure which shows the directivity of the vertically polarized wave in XY plane,
(C) is a figure which shows the directivity of the vertically polarized wave in a ZX plane. In the figure, 1 is a mobile phone main body, 2 is a transmission / reception helical antenna, 3 is a high frequency circuit, 4 is a voice circuit, 5 is a receiver, 6 is a microphone, and 7 is a liquid crystal display (hereinafter, referred to as an LCD). 8) is a microcomputer for controlling each part, and 9 is a power pattern showing the strength of the transmission / reception level of the radio wave on each plane.

Next, the operation of the mobile phone will be described with reference to FIG.
This will be described with reference to FIG. Radio waves transmitted from a base station or a base unit (both not shown) are received by the helical antenna 2. After that, it is demodulated into a digital signal by the high frequency circuit 3, converted into voice by the voice circuit 4, and output as voice from the receiver 5. The voice input from the microphone 6 is converted into a digital signal by the voice circuit 4, modulated into a transmission wave by the high frequency circuit 3, and transmitted from the helical antenna 2 to the base station or the master unit.

The microcomputer 8 controls the above operation. The microcomputer 8 can read the received power level output from the high frequency circuit 3, and the read level can be read as L
Relative numerical value display or level meter display on CD7.

Next, the directivity of the helical antenna 2 will be described with reference to FIG. First, as shown in FIG. 23B, the directivity of the vertical polarization of the horizontal plane of the helical antenna 2, that is, the XY plane is almost omnidirectional because the power pattern is evenly strong in all directions. I understand. Further, in the vertical plane, that is, the ZX plane, FIG.
As shown in (c), the power pattern becomes stronger as it approaches the X-axis direction, and the power pattern becomes weaker as it approaches the Z-axis direction, and it can be seen that there is directivity. Further, although not shown, also on the Y-X plane, there is a directivity in which the power pattern becomes stronger as it approaches the Y-axis direction and becomes weaker as it approaches the Z-axis, similar to the Z-X plane.

[0006] Another problem with mobile phones is noise during a call. This noise mainly occurs when the electric power of the received radio wave is weak, that is, when the electric wave is far from the base station or the base unit. Therefore, it is possible to increase the received power and reduce noise by detecting the direction of the base station and approaching it, or if the antenna has directivity, by setting the direction with strong directivity to the direction of the base station. You can In addition,
The cordless handset is equipped with an omnidirectional antenna and a directional antenna, and a call is made using the omnidirectional antenna at a callable distance.
It is disclosed in Japanese Patent Laid-Open No. 4-261250 that the call distance is extended and the call quality is improved by switching to a directional antenna to make a call when the call quality approaches the noise source and the call quality deteriorates.

[0007]

The conventional mobile phone is constructed as described above, the helical antenna 2 is almost omnidirectional on the horizontal plane, and the direction of arrival of the radio wave on the horizontal plane cannot be grasped, and noise during a call is generated. There is a problem that even if an attempt is made to bring the mobile phone closer to the base station or the base unit of the radio wave transmission source in order to reduce the number, the direction cannot be known and the mobile phone cannot be brought close to the base station.

The present invention has been made to solve the above problems, and an object thereof is to obtain a mobile phone capable of detecting the arrival direction of a radio wave.

[0009]

A portable telephone according to the present invention is provided with an antenna having an omnidirectional characteristic on a horizontal plane, a reflector for reflecting radio waves, and a reflector which is provided with this reflector and is detachable from the antenna. And a holding tool.

Further, a metal wire is used for the reflector. Furthermore, a coil or a capacitor is connected to the metal wire of the reflector. Further, a metal flat plate is used for the reflector. Further, the metal flat plate used for the reflector is bent in the direction of the antenna.

Further, the mobile phone according to the present invention has an antenna having an omnidirectional characteristic on a horizontal plane, a reflector for reflecting radio waves, a reflector holder provided with this reflector, and a detachable reflector holder for the radio waves. A director for guiding the wave and a director holder provided with the director and detachably attached to the antenna are provided, the antenna is arranged between the reflector and the director, and The reflector holder and the waveguide holder are attached to the antenna so that the wave devices face each other.

Further, a metal flat plate is used for the reflector.

[0013]

In the portable telephone according to the present invention, by mounting the reflector holder on the antenna, the combined characteristics of the antenna and the reflector have directivity on the horizontal plane. Further, by using the metal wire for the reflector, the combined characteristics of the antenna and the metal wire have directivity on the horizontal plane.

Further, by connecting a coil or a capacitor to the metal wire of the reflector, the loading impedance is changed and the directivity is adjusted to have a desired characteristic.
Further, by using the metal flat plate for the reflector, the directivity can be enhanced as compared with the case where the metal wire is used. Also,
By bending the metal flat plate used for the reflector in the direction of the antenna, the directivity can be enhanced.

Further, in the mobile phone according to the present invention, the reflector holder and the waveguide holder are attached to the antenna so that the reflector and the director face each other with the antenna arranged between the reflector and the director. By mounting the tool, the composite characteristics of the antenna, the reflector and the director have directivity on the horizontal plane.

Further, by using the metal flat plate for the reflector, the combined characteristics of the antenna, the metal flat plate and the director have directivity on the horizontal plane.

[0017]

EXAMPLES Example 1. 1A and 1B are external views of a mobile phone showing an embodiment of the present invention. FIG. 1A is a top view and FIG. 1B is a side view. FIG. 2 is a model diagram showing the directivity of the antenna of this mobile phone, FIG. 3 is an actual measurement diagram of the directivity of this antenna, and FIG. 4 is a view showing the display state of the liquid crystal display of the mobile phone. The simplified block diagram of the mobile phone is shown in FIG.
Divert.

In the figure, the same or corresponding parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 10 is a reflector made of a metal wire such as copper wire, 11 is a reflector holder made of, for example, plastic or ABS resin, and incorporating the reflector 10, so that it can be attached to the protrusion of the helical antenna 2. It has a tubular portion 12. The reflector holder 11 is a reflector holder.

Next, the operation will be described. First, when noise occurs during a call by the mobile phone body 1,
The reflector holder 11 is attached to the helical antenna 2 so that the mobile phone body 1 has the directivity shown in FIG. In particular, with respect to the horizontal plane, when viewed from the helical antenna 2 as shown in FIG. 2A, the reception level in the direction of the reflector 10 becomes low, and in the opposite direction, the reception power level becomes high. Have. This has a characteristic that directivity is generated by the interference between the direct wave radiated from the helical antenna 2 and the reflected wave reflected by the reflector 10, and due to the reversibility of the antenna, the same directivity at the time of reception. It takes advantage of that. The measured figure is shown in FIG.

In the mobile phone, the received power level (in the case of a digital mobile phone, the error rate of the received signal is also possible) is displayed on the liquid crystal display. That is, in FIG. 22, the radio wave received from the antenna 2 is demodulated into a digital signal by the high frequency circuit 3,
In the process, the received power level information is supplied to the microcomputer 8 side. The microcomputer 8 reads this information and displays it on the LED 7 as a relative numerical value or level meter value. LC
The display method of D7 is shown in FIG. 4, (a) is a level display by relative numerical values, and (b) is a level display by a bar-shaped level meter. Furthermore, the received power level may be expressed by the strength or weakness of the sound emitted by the speaker 5.

Therefore, while checking the received power level displayed on the LCD 7, the user holds, for example, the mobile phone main body 1 and rotates it so that the direction with the higher received power level goes around the horizontal plane. The direction indicated by the largest display value is determined to be the direction of the base station or the base unit, and the received power level is increased by directing in that direction to reduce the generation of noise.

Example 2. Although the mobile phone main body 1 uses the helical antenna 2 in the first embodiment, other antennas may be used. The following shows a mobile phone using several types of antennas. FIG. 5 is a side view of a mobile phone equipped with the helical sleeve antenna 13,
FIG. 6 is a side view of a mobile phone equipped with the monopole antenna 14, and FIG. 7 is a side view of a mobile phone equipped with the sleep antenna 15. Regarding FIGS. 5, 6 and 7,
The top view is similar to FIG. 1 (a) (not shown), and
The side view is omitted since the lower half of the mobile phone body 1 is the same as that in FIG. 1, and the same applies hereafter. For directivity,
A mobile phone equipped with the helical sleeve antenna 13, the monopole antenna 14 or the sleeve antenna 15 has almost the same directivity as that equipped with the helical antenna 2.

Example 3. FIG. 8 is a side view of a mobile phone showing another embodiment of the present invention, and the top view thereof is the same as that of FIG. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 16 is a coil connected in the middle of the reflector 10. First, the helical antenna 2 is used as the directional antenna, the reflector 10 is used as the non-excitation antenna, the loading impedance of the non-excitation antenna is Z = jX, the mutual impedance is Z ₁₂ = R ₁₂ + jX ₁₂ , and the self-radiation of the non-excitation antenna is used. If the impedance is Z ₂₂ = R ₂₂ + jX ₂₂ , the phase of the directional antenna is

[0024]

[Equation 1]

[0025]

[0026]

[Equation 2]

It can be seen that is contributed by Therefore,

[0028]

[Equation 3]

X of the load impedance Z =
When jX is changed, the directivity changes, and by adjusting the value, it is possible to bring the directivity closer to the desired directivity. Therefore, in this embodiment, the loading impedance of the coil 16 is varied to adjust the directivity to have a desired characteristic.

Example 4. In the third embodiment, the load impedance of the coil 16 is changed, but a capacitor may be used instead of the coil 16,
The same effect as the third embodiment is obtained. FIG. 9 is a side view of a mobile phone showing another embodiment of the present invention, and the top view thereof is the same as that of FIG. In the figure, parts that are the same as or correspond to those in the third embodiment are assigned the same reference numerals,
The description is omitted. Reference numeral 17 is a capacitor connected in the middle of the reflector 10, and changes the loading impedance Z = jX to adjust it to a desired directivity, as in the fifth embodiment.

Example 5. FIG. 10 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. FIG. 11 is an actual measurement diagram of the directional characteristics of this antenna. In the figure, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and explanations thereof are omitted. 18
Is a flat metal plate, and corresponds to a reflector having a function of a reflecting element. Therefore, as shown in FIG. 11, the mobile phone body 1 can be provided with directivity, and the directivity can be made stronger than that of the metal wire reflector 10.

Example 6. FIG. 12 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. FIG. 13 is an actual measurement diagram of the directional characteristics of this antenna. In the figure, the same or corresponding parts as those in the above-described first embodiment are designated and the description thereof is omitted. Reference numeral 19 denotes a single metal flat plate bent at the center of the flat plate and corresponds to a reflector having a function of a reflecting element. Therefore, as shown in FIG. 13, the mobile phone body 1 can be provided with directivity, and the directivity can be made stronger than that of the metal wire reflector 10.

Example 7. FIG. 14 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 20 denotes one flat metal plate which is bent in two places and corresponds to a reflector having a function of a reflecting element.

Example 8. FIG. 15 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. In the figure, parts that are the same as or correspond to those in the fifth embodiment are given the same reference numerals, and descriptions thereof will be omitted. Reference numeral 21 denotes a director made of a metal wire such as a conducting wire, and 22 denotes, for example, a plastic or ABS resin.
Is a director holder incorporating a reflector holder 1
A cylindrical portion 23 is formed by cutting out a part in the vertical direction so that it can be mounted on the protruding portion of the helical antenna 2 from above the cylindrical portion 12. The director holder 22 represents a director holder.

Next, the operation will be described. First, when noise occurs during a call by the mobile phone body 1,
The helical antenna 2 is arranged between the metal flat plate 18 and the director 21, and the reflector holder 11 and the director holder 22 are attached to the helical antenna 2 so that the metal flat plate 18 and the director 21 face each other. , The mobile phone body 1 is provided with directivity. In particular, with respect to the horizontal plane, the reception level of the metal flat plate 18 in the direction of the reflector becomes low, and the direction of the director 21 located opposite thereto has the directivity that the reception power level becomes high.

This is because the direct wave radiated from the helical antenna 2 interferes with the reflected wave reflected by the reflector of the metal flat plate 18, and the director 21 excites the radio wave to the exciter of the mobile phone body 1. By utilizing the fact that the directivity is generated by guiding it toward the director 21 when viewed, and the similar directivity is generated during reception due to the reversibility of the antenna. The actual measurement diagram is shown in FIG. Also, the metal flat plate 1
A similar effect can be obtained by using a metal wire reflector 10 instead of the reflector of 8.

Therefore, the user can use the LCD as in the first embodiment.
While confirming the received power level displayed on 7, the mobile phone body 1 is held, for example, and rotated so that the direction with the higher received power level goes around the horizontal plane. The direction indicated by the largest display value is determined as the direction of the base station or the base unit, and the direction is directed to that direction to increase the received power level and reduce the generation of noise.

Example 9. FIG. 17 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. In the figure, parts that are the same as or correspond to those in the above-described eighth embodiment are given the same reference numerals, and descriptions thereof will be omitted. In the above-described Example 8, one waveguide 21 was used, but two waveguides 21 may be used as shown in FIG. 17, and the horizontal plane is the direction of the reflector of the metal flat plate 18. The reception level of the antenna becomes low, and the waveguide 2 located on the opposite side
On the contrary, the direction of 1 has the directivity that the reception level becomes high. Therefore, as shown in the actual measurement diagram of FIG. 18, it is possible to give the mobile phone body 1 more directivity. The same effect can be obtained by using the metal wire reflector 10 instead of the metal flat plate 18.

Example 10. FIG. 19 is an external view of a mobile phone showing another embodiment of the present invention, (a) is a top view,
(B) is a side view. In the figure, parts that are the same as or correspond to those in the above-described eighth embodiment are given the same reference numerals, and descriptions thereof will be omitted. Reference numeral 20 denotes a reflector which is formed by bending one flat metal plate in the direction of the helical antenna 2 at two locations. By this bending, the directivity in the horizontal plane can be further strengthened. Further, the product can be miniaturized by bending the metal flat plate at two places and suppressing the protrusion of the metal flat plate to reduce the capacitance of the reflector. Note that, although FIG. 19 shows one reflector used for the reflection plate 20, two directors may be used as shown in FIG. 20, and the directivity of the horizontal plane should be made stronger. You can

[0040]

As described above, according to the present invention, since the reflector holder is attached to the antenna, the combined characteristic of the antenna and the reflector has the directivity on the horizontal plane.
It is possible to detect the direction of arrival of radio waves, and when noise occurs during use of a mobile phone, directing the direction with strong directivity of the mobile phone toward the base station of the radio wave transmission source or the base unit has the effect of reducing noise. is there.

Further, by using a metal wire for the reflector, since the composite characteristic of the antenna and the metal wire has directivity on a horizontal plane, the arrival direction of the radio wave can be detected, and the mobile phone can be directed to the radio wave transmission source. There is an effect that noise can be reduced.

Further, by connecting the coil or the capacitor to the reflector of the metal wire, there is an effect that the loading impedance can be changed and the directivity can be adjusted to have the characteristics desired by the user. In addition, the use of a metal flat plate for the reflector has the effect of enhancing the directivity.

Further, by bending the metal flat plate used for the reflector toward the antenna, the directivity can be made stronger, the detection of the arrival direction of the radio wave can be further enhanced, and the outward direction of the metal flat plate can be improved. There is an effect that the protrusion can be suppressed, the capacity of the reflector can be reduced, and the mobile phone itself can be downsized.

Further, the antenna is arranged between the reflector and the director, and the reflector holder and the director holder are attached to the antenna so that the reflector and the director face each other. By strengthening the directivity of the combined characteristics of the reflector and the director, the arrival direction of the radio wave can be detected more accurately, and the direction of the base station of the radio wave transmission source or the base unit direction can be easily detected.

Further, by using a metal flat plate for the reflector to enhance the directivity as a composite characteristic of the antenna, the metal flat plate and the waveguide, the arrival direction of the radio wave can be detected more accurately, and the base station of the radio wave transmission source or The effect is that the direction of the master unit can be detected more accurately.

[Brief description of drawings]

FIG. 1 is an external view of a mobile phone according to a first embodiment of the present invention.

FIG. 2 is a model diagram of the directivity of the antenna according to the first embodiment of the present invention.

FIG. 3 is an actual measurement diagram of the antenna according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a display state of the liquid crystal display of the mobile phone according to the first embodiment of the present invention.

FIG. 5 is a side view of a mobile phone equipped with a helical sleeve antenna according to a second embodiment of the present invention.

FIG. 6 is a side view of a mobile phone equipped with a monopole antenna according to a second embodiment of the present invention.

FIG. 7 is a side view of a mobile phone equipped with a sleeve antenna according to a second embodiment of the present invention.

FIG. 8 is a side view of a mobile phone according to a third embodiment of the present invention.

FIG. 9 is a side view of a mobile phone according to a fourth embodiment of the present invention.

FIG. 10 is an external view of a mobile phone according to a fifth embodiment of the present invention.

FIG. 11 is an actual measurement diagram of the directivity of the antenna according to the fifth embodiment of the present invention.

FIG. 12 is an external view of a mobile phone according to a sixth embodiment of the present invention.

FIG. 13 is an actual measurement diagram of the directivity of the antenna according to the sixth embodiment of the present invention.

FIG. 14 is an external view of a mobile phone according to a seventh embodiment of the present invention.

FIG. 15 is an external view of a mobile phone according to an eighth embodiment of the present invention.

FIG. 16 is an actual measurement diagram of the directivity of the antenna according to the eighth embodiment of the present invention.

FIG. 17 is an external view of a mobile phone according to a ninth embodiment of the present invention.

FIG. 18 is an actual measurement diagram of the directivity of the antenna according to the ninth embodiment of the present invention.

FIG. 19 is an external view of a mobile phone according to a tenth embodiment of the present invention.

FIG. 20 is an external view of another mobile phone according to the tenth embodiment of the present invention.

FIG. 21 is an external view of a conventional mobile phone.

FIG. 22 is a simplified block diagram of a conventional mobile phone.

FIG. 23 is a diagram showing the directivity of an antenna of a conventional mobile phone.

[Explanation of symbols]

 1 Cellular Phone Main Body 2 Helical Antenna 7 Liquid Crystal Display 9 Power Pattern 10 Reflector 11 Reflector Holder 16 Coil 17 Capacitor 18 Metal Flat Plate 19 Metal Flat Plate 20 Metal Flat Plate 21 Waveguide 22 Waveguide Holder

Claims (7)

[Claims] 1. In a mobile phone that receives radio waves transmitted from a base station or a base unit, an antenna having an omnidirectional characteristic on a horizontal plane, a reflector that reflects radio waves, and this reflector are provided, and the antenna is provided in the antenna. A mobile phone comprising a detachable reflector holder. 2. The mobile phone according to claim 1, wherein a metal wire is used for the reflector. 3. The mobile phone according to claim 2, wherein a coil or a capacitor is connected to the metal wire of the reflector. 4. The mobile phone according to claim 1, wherein a metal plate is used for the reflector. 5. The mobile phone according to claim 4, wherein the metal flat plate used for the reflector is bent toward the antenna. 6. A mobile phone that receives radio waves transmitted from a base station or a base unit, an antenna having an omnidirectional characteristic on a horizontal plane, a reflector that reflects radio waves, and this reflector are provided, and the antenna is provided. A detachable reflector holder, a director for guiding radio waves, and a waveguide holder provided with this director, wherein the antenna holder is detachable.
The antenna is arranged between the reflector and the director, and the reflector holder and the director holder are attached to the antenna so that the reflector and the director face each other. A mobile phone characterized by: 7. The mobile phone according to claim 6, wherein a metal plate is used for the reflector.