JPH10256819A - Radio equipment and radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio equipment whose radiation gain is remarkably improved coping with requirements of miniaturization. SOLUTION: Since a radio equipment enclosure 5 is excited by a ground consisting of a helical antenna 8 fitted to the radio equipment enclosure 5, the radio equipment enclosure 5 and a ribbon conductor 6, a radiation gain from the radio equipment is improved and since the ribbon conductor 6 is interposed between the the radio equipment enclosure 5 and a personal computer main body 1 in addition, an electromagnetic coupling between the antenna 8 and the personal computer main body 1 is strengthened, resulting that the entire radiation grain of the radio equipment is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device and a wireless system used for, for example, a portable wireless system and a wireless LAN.

[0002]

2. Description of the Related Art In recent years, wireless devices have been miniaturized. As a result, the size of the antenna must be reduced, and the radiation gain of the wireless device necessarily decreases. In order to compensate for the deterioration of the radiation gain due to the miniaturization of the radio including the antenna, there is a method of using the housing of the radio as a radiating element of the antenna. FIG. 8 shows the configuration of the wireless device in this case. As shown in FIG. 8, an antenna 103 is connected to an antenna feed point 102 of a housing 101 of the wireless device.
In FIG. 8, as a result of the antenna 103 exciting the housing 101, the housing 101 functions as a radiating element of the antenna 103 to prevent deterioration of the radiation gain of the entire wireless device.

However, with the recent development of portable radios and the like, further miniaturization of the radios has been demanded, and the housing of the radios has been forced to be further miniaturized. Cannot be used as a radiating element of an antenna. In particular, when the length of one side of the housing is 以下 or less of the wavelength of the operating frequency, this tendency is strong, and the radiation gain of the wireless device is significantly deteriorated.

In order to compensate for this drawback, for example, when a portable radio is connected to a personal computer to perform data communication, a housing of the personal computer, which is a conductor near the radio, is used as an antenna. It is possible.

[0005] However, it is good if the personal computer body is near the wireless device and the electromagnetic coupling between the personal computer body and the wireless device housing is strong, but it does not work well if the electromagnetic coupling is weak. For example, FIG. 9 shows a state in which a wireless device is mounted on a personal computer to perform data communication. In FIG. 9, a radio housing 101 to which an antenna 103 is connected is mounted on a personal computer main body 104. FIG. 10 shows a radiation pattern in a horizontal plane in the case of FIG. As is clear from FIG. 10, this antenna is two times smaller than the dipole.
The radiation gain is degraded by about 0 dB. When the electromagnetic field coupling between the wireless device housing and the personal computer body is not strong, the personal computer body does not work as a radiating element of the antenna, and the radiation gain itself of the wireless device deteriorates. I was

[0006]

As described above, in the conventional radio device, there is a problem that the radiation gain is degraded due to the miniaturization of the housing of the radio device itself, and the radio performance is significantly degraded. there were. In addition, even if there is a conductor near the wireless device, if the electromagnetic field coupling between the wireless device housing and the nearby conductor is weak, deterioration of wireless performance cannot be prevented. This deterioration in radio performance is due to the fact that despite the presence of a conductor that could be used as a radiating element in the vicinity, this conductor could not be fully utilized, and such a nearby conductor could not be used. It is considered that the reason is that the electromagnetic coupling between the wireless device and the nearby conductor was small.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a radio and a radio system in which the radiation gain of an antenna is improved.

Another object of the present invention is to provide a radio and a radio system capable of enhancing electromagnetic coupling with a terminal.

It is a further object of the present invention to provide a wireless device and a wireless system capable of further enhancing electromagnetic coupling with a terminal.

[0010]

According to a first aspect of the present invention, there is provided a conductive container, an antenna having the container as a ground, and a container connected to the container.
A conductor extending the ground of the antenna.

According to a second aspect of the present invention, in a wireless device disposed adjacent to a terminal, a conductive container having a built-in wireless circuit for transmitting / receiving data of the terminal, and the container serving as a ground. An antenna that emits electromagnetic wave energy generated in the wireless circuit; and a conductor connected to the container and interposed between the container and the terminal. According to a third aspect of the present invention, there is provided a wireless device disposed adjacent to a terminal, wherein a conductive housing having a built-in wireless circuit for transmitting / receiving data of the terminal is provided, and a first housing of the housing is provided. An antenna that is connected to a side surface as a ground and emits electromagnetic wave energy generated in the wireless circuit; and an antenna that is connected to a second side surface facing the first side surface of the housing, and the second side surface of the housing A conductor disposed between the housing and the terminal, the conductor being disposed over a surface adjacent to the terminal;

According to a fourth aspect of the present invention, there is provided a terminal, and a wireless device disposed adjacent to the terminal, and the wireless device has a built-in wireless circuit for transmitting and receiving data of the terminal. A conductive housing, an antenna connected to the first side surface of the housing as a ground, for emitting electromagnetic wave energy generated by the wireless circuit, and a second side surface facing the first side surface of the housing And a conductor disposed between the second side surface and a surface of the housing adjacent to the terminal and interposed between the housing and the terminal. , A wireless system is provided.

According to the first aspect of the present invention, since the conductor functions to extend the ground to the antenna, the radiation gain of the antenna can be improved even if the housing is downsized.

Further, in the wireless device according to the present invention, the radiation gain can be improved by the conductor connected to the housing (container) of the wireless device as described above. Since the conductor is configured to be interposed between the housing and the terminal, electromagnetic coupling between the antenna and the terminal can be enhanced. Therefore, the terminal can be positively used as a radiating element. As a result, the radiation gain of the wireless device can be further improved.

Therefore, according to the present invention, for example, a region in which the radiation gain and the radio performance significantly deteriorate due to the miniaturization of the small antenna and the radio device housing, particularly, the length of one side of the housing is one wavelength of the operating frequency. Even in a region where the height of the antenna is 以下 or less and the height of the antenna is ８ or less of the wavelength, the radiation gain and the radio performance are not significantly deteriorated, and the radiation gain of the radio including the terminal as a close conductor is greatly improved. As a result, it is possible to provide a wireless device having required performance corresponding to the recent demand for downsizing of the wireless device.

[0016]

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

FIG. 1 is a perspective view showing the configuration of a wireless system according to one embodiment of the present invention.

As shown in FIG. 1, a display 2 is arranged adjacent to a terminal, for example, a personal computer 1 of a vertical type. The housing of the personal computer 1 is made of a conductor, for example, metal. A wireless device 3 is arranged on the upper surface of the personal computer 1. The wireless device 3 is connected to, for example, the personal computer 1 via a cable (not shown), exchanges data with the personal computer 1 via a cable, and communicates with the other side of the wireless system, such as a wireless LAN or a portable wireless device. Data communication is performed with the base station.

FIGS. 2 to 4 show the configuration of the above-mentioned wireless device 3. FIG. 2 is a cross-sectional view of the wireless device 3, FIG. 3 is a longitudinal sectional view of the wireless device 3, and FIG.

As shown in these figures, a radio device housing 5 is disposed in a plastic housing 4. The wireless device housing 5 is made of a conductive material, for example, metal, and has a built-in wireless circuit (not shown) for transmitting and receiving data of the personal computer 1. A short antenna, for example, a λ / 4 helical antenna 8 that emits electromagnetic wave energy generated in a wireless circuit is attached to an antenna feed point 7 on the first side surface 5 a of the wireless device housing 5. On the other hand, a conductor extending the ground of the helical antenna 8, for example, a ribbon-shaped conductor 6, is connected to the second side surface 5b of the wireless device housing 5. The ribbon-shaped conductor 6 is arranged from the second side surface 5b to the adjacent surface 5c of the wireless device housing 5 with the personal computer body 1 and is interposed between the wireless device housing 5 and the personal computer body 1. The ribbon-shaped conductor 6 is also provided on the PC surface 1 on the adjacent surface 5c.
No contact.

The dimensions of each part of the wireless device 3 are, for example, the following values.

D = λ / 20 L = λ / 4 where D is the height of the antenna 8 and L is the length from the feeding point 7 to the tip 6 a of the ribbon-shaped conductor 6.

The circuit configuration of the antenna 8 is as shown in FIG. 5, for example. That is, the power supply line of the wireless circuit is connected to the antenna 8 at the power supply point 7, and the ground of the wireless circuit is connected to the wireless device housing 5. That is,
For the λ / 4 helical antenna 8, a ground of approximately λ / 4 is formed by the wireless device housing 5 and the above-mentioned ribbon-shaped conductor 6 connected thereto.

Next, the radiation effect of radio waves in the wireless system configured as described above will be described. FIG. 6 is a perspective view conceptually showing the wireless system according to the present embodiment.

As shown in FIG. 2, the electromagnetic wave excited by the helical antenna 8 attached to the wireless device housing 5 and the ground comprising the wireless device housing 5 and the ribbon-shaped conductor 6 is radiated into the air. At the same time, the personal computer body 1 is electromagnetically coupled. Therefore, the electromagnetic wave is also radiated from the personal computer body 1 into the air. Here, in the wireless system of the present embodiment, since the ground is set to have a length of λ / 4 between the wireless device housing 5 and the ribbon-shaped conductor 6, the radiation gain from the wireless device can be improved. it can. In addition, since the ribbon-shaped conductor 6 is interposed between the wireless device casing 5 and the personal computer body 1, electromagnetic coupling between the antenna and the personal computer body 1 can be strengthened, and the radiation gain from the personal computer body 1 can be enhanced. Can also be improved.

As described above, according to the radio system of the present embodiment, the radiation gain from the radio device is improved, and the personal computer body 1 effectively functions as a radiating element of the antenna 8. Can be improved.

FIG. 7 shows the results of an experiment performed to confirm the effects of the present embodiment.

FIG. 7 shows the result of measurement using the radio model constructed as shown in FIG. The wireless device model shown in FIG. 6 is obtained by attaching the ribbon-shaped conductor 6 to the configuration of FIG. 9 which is a model obtained by measuring the radiation pattern of FIG. As in the case of FIG. 9, the measurement is performed with the wireless device housing 5 placed on the personal computer 1. The parameters of each unit are as shown below.

D = λ / 20 L = λ / 4 W1 = λ / 8 W2 = λ / 8 W3 = λ / 12 where D is the height of the antenna 8 and L is the tip of the ribbon-shaped conductor 6 from the feeding point 7 Lengths up to 6a, W1, W2, and W3 are vertical, horizontal, and height dimensions of the wireless device housing 5, respectively.
As is clear from the radiation pattern of FIG. 7, the radiation gain of the entire radio can be reduced by 1 by attaching the ribbon-shaped conductor 6.
It is improved by about 5 dB. In this way, the radio device configured as shown in FIG. 6 has significantly improved radiation characteristics compared to the case where the ribbon-shaped conductor 6 is not provided.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention.

For example, in the embodiment described above, a helical antenna is described as an example of the antenna 8, but an antenna such as an inverted F antenna can be used.

Although metal is exemplified as the material of the wireless device housing 5, any material that functions as an antenna, such as conductive plastic, can be used.

Further, the ribbon-shaped conductor 6 may be attached to any place other than the surface of the housing as long as it is connected to the ground of the antenna at a high frequency.
For example, FIG. 11 is a configuration diagram in a case where the wireless device housing 5 is small and the wireless circuit board 9 protrudes around the housing 5. In these cases, since the antenna 8 is attached to the wireless circuit board 9, the ground of the wireless circuit board 9 is used as the ground of the antenna 8. In this case, as shown in FIG. 11, the ribbon-like conductor 6 for extending the ground, which has been attached to the wireless device housing 5, may be attached to the ground of the wireless circuit board 9.

In the above-described embodiment, a ribbon-shaped conductor has been described as an example of a conductor that extends the ground of the antenna. However, for example, a linear conductor may be used. Furthermore, in the above-described embodiment, the personal computer 1 has been described as an example that functions as a radiation element. However, for example, a conductor other than the personal computer can be used as a nearby conductor.

Further, in the above-described embodiment, the case where the length L from the feeding point 7 to the tip of the ribbon-shaped conductor 6 is ４ of the wavelength of the operating frequency has been described as an example. It has been confirmed by experiments that if the ribbon-shaped conductor 6 is routed to the surface adjacent to the personal computer body 1 as a nearby conductor, the present invention is effective not only in the case where the wavelength is 1/4 of the wavelength. I have.

[0036]

As described above in detail, according to the first aspect of the present invention, a conductive container, an antenna using the container as a ground, and a ground connected to the container and extending the ground of the antenna are provided. The radiation gain of the antenna can be improved even if the housing is downsized.

According to the present invention, the conductor for extending the ground is connected to the housing (container) and the conductor is interposed between the housing and the terminal. Thus, the radiation gain of the wireless device can be further improved.

Therefore, according to the present invention, it is possible to greatly improve the radiation characteristics of the entire radio system including the adjacent terminals, and to provide a radio having the required radiation performance corresponding to the recent demand for miniaturization. can do.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a configuration of a wireless system according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the wireless device according to one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of the wireless device according to one embodiment of the present invention.

FIG. 4 is a perspective view of a wireless device according to an embodiment of the present invention.

FIG. 5 is a conceptual diagram of an antenna according to an embodiment of the present invention.

FIG. 6 is a diagram for explaining the operation of the wireless system according to one embodiment of the present invention.

FIG. 7 is a diagram showing the results of an experiment performed to confirm the effects of the present invention.

FIG. 8 is a conceptual diagram showing a configuration of a conventional wireless device.

FIG. 9 is a conceptual diagram of a conventional wireless system.

FIG. 10 is a diagram showing a pattern of radiation characteristics of the conventional wireless device in the case of FIG. 9;

FIG. 11 is a diagram showing another embodiment of the wireless system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Personal computer main body 2 Personal computer display 3 Radio 4 Plastic housing 5 Radio housing 6 Ribbon conductor 7 Antenna feeding point 8 Antenna 9 Radio circuit board 101 Radio housing 102 Antenna feeding point 103 Antenna 104 Personal computer main body

Claims (4)

[Claims] 1. A wireless device comprising: a conductive container; an antenna having the container as a ground; and a conductor connected to the container and extending a ground of the antenna. 2. A wireless device arranged adjacent to a terminal, wherein a conductive container having a built-in wireless circuit for transmitting and receiving data of the terminal is provided, and the container is grounded and generated by the wireless circuit. A wireless device, comprising: an antenna that emits electromagnetic wave energy; and a conductor connected to the container and interposed between the container and the terminal. 3. A wireless device disposed adjacent to a terminal, a conductive housing containing a wireless circuit for transmitting and receiving data of the terminal, and a ground on a first side surface of the housing. An antenna that is connected and emits electromagnetic wave energy generated in the wireless circuit; and an antenna that is connected to a second side facing the first side of the housing and is connected to the terminal of the housing from the second side. A wireless device comprising: a conductor disposed over an adjacent surface and interposed between the housing and the terminal. 4. A terminal, and a wireless device arranged adjacent to the terminal, wherein the wireless device has a conductive housing containing a wireless circuit for transmitting and receiving data of the terminal, An antenna that is connected to a first side surface of the housing as ground and emits electromagnetic wave energy generated in the wireless circuit; and an antenna that is connected to a second side surface facing the first side surface of the housing. A wireless system comprising: a conductor disposed between the side surface of the housing and a surface of the housing adjacent to the terminal, the conductor being interposed between the housing and the terminal.