JP2000138625A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device having high performance that provides a wide communication area without any installation work or communication interruption. SOLUTION: The device is a piece of mobile equipment that has a reception function, a transmission function and a relay function of a radio signal, where antenna element groups A, B consisting of antenna elements A1-An and B1-Bn are laid out in line and the corresponding elements of the groups are placed back to back. The feeding point of each antenna element Ak is connected to the feeding point of each antenna element Bm (m=n+1-k, k=1-n/2) directly or via an amplifier, respectively. The antenna element groups A, B can be directed to an arbitrary direction, either of both antenna element groups A, B transmits/receives information of its own station and a radio wave received by either of the antenna element groups A, B is emitted from the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small, high-performance communication device used indoors, on premises, and the like.

[0002]

2. Description of the Related Art FIGS. 7A and 7B show a conventional communication device. FIG. 7A shows a case where a base station 101 is installed on a ceiling in a room 100, and FIG. This is the case when it is installed. In the room 100, a terminal 102 and a wireless communication device 103 connected thereto are arranged and a person 104 is present.

[0003] As described above, the conventional wireless communication apparatus 103 only receives and transmits radio waves from the base station 101. Therefore, (a), the base station 1 from which wireless communication device 103 to obtain the desired reception power
01, so that the base station 10
1 was installed on the ceiling. Therefore, the base station 101
Extensive construction was required for the installation. On the other hand, as shown in FIG.
There is also a method of placing 1 on the same height position as another terminal (wireless communication device), that is, a desk or the like. In this case, as in the wireless communication device 103 'of the terminal 102' having no line of sight, communication has to be performed by reflected waves from the ceiling or the like, and sufficient reception power cannot be secured. Furthermore, there is a wireless communication device 103 "of the terminal 102" where radio waves do not reach at all, and communication cannot be performed in some cases. Further, in these cases, since the angle at which the radio wave arrives is low, the radio wave is cut off when a person 104 enters between the base station 101 and the terminal 103,
There was a drawback that communication was not possible.

[0004] That is, the conventional communication apparatus has the drawbacks that construction is required, sufficient reception power cannot be secured, a place where communication is not possible occurs, and communication is interrupted when blocked by people, furniture, or the like. .

[0005]

SUMMARY OF THE INVENTION The present invention overcomes the above disadvantages, does not require construction, has a wide communication area,
An object of the present invention is to provide a high-performance communication device in which communication is not interrupted.

[0006]

According to the present invention, there is provided a communication device which is scattered at an arbitrary place and which transmits and receives information to and from each other by radio, the communication device is movable and has a receiving function; It has a transmission function and a relay function. This communication device has, in particular, two antenna element groups A and B, each of which has one or more antenna elements, each of which is directed in an arbitrary direction. It is possible to transmit and receive the information of the own station from both or one of the antenna element groups A and B,
The radio wave incident from the antenna element group B is radiated from the antenna element group B, and the radio wave incident from the antenna element group B is radiated from the antenna element group A.

[0007]

Embodiment 1 FIG. 1 shows Embodiment 1 of the present invention. Base station 1, terminal 2,
A wireless communication device 3 connected to the terminal 2;
3 'and 3 "are arranged on a table 4 such as a desk, respectively. Radio waves 5 and 5' arrive from the base station 1 to the terminal 2. Each radio communication device 3 receives a radio wave from the base station 1. In addition to the function of receiving the information of the own station and radiating the received radio wave again, the radio wave from the base station 1 is cut off by the obstacle 4 like the terminal 2 ″ and the wireless communication device 3. Even in places where radio waves from base station 1 do not arrive,
Since the radio communication device 3 'relays the radio wave from the base station 1, the re-radiated radio wave 6' arrives at the terminal 2 "and the radio communication device 3", and communication becomes possible. Here, since all the wireless communication devices 3, 3 ', 3 "have the same relay function, if a certain number or more terminals are distributed and installed, the layout of each wireless communication device 3 is designed with special consideration. In other words, the wireless communication device 3 ′ is not special, and is arranged so that a certain number or more terminals can communicate in a room, so that the wireless communication device 3 ′ can naturally communicate without being aware of the overall positional relationship. A device such as the communication device 3 ′ is present, and communication can be performed with all terminals.

As described above, the base station is placed at a low position such as a desk so that no work is required, and even if the terminal arrangement is not specially designed, there is an effect that a terminal with no line of sight can communicate. Embodiment 2 FIGS. 2A and 2B are diagrams showing Embodiment 2 of the present invention, wherein FIG. 2A is an overall configuration diagram of a communication device, and FIG. 2B is a circuit diagram. An antenna element group A7 and an antenna element group B8 each including a plurality of antenna elements 11 are provided, and information to the wireless device 3 of the own station is obtained from the antenna element group A7, and is transmitted from the antenna element group A7 to the antenna element group B8. On the contrary, a radio wave is relayed from the antenna element group B8 to the antenna element group A7 via the circulator 10. (B)
As described above, a higher effect can be obtained by amplifying the radio wave by the amplifier 9 when relaying. In this case, the antenna element group A
7. The directional direction D of the antenna element group B8 and the distance L to each other need to be determined so as not to oscillate due to coupling. If oscillation does not occur, the positions and distances of the antenna element groups A and B may be appropriate, but the antenna element group A7 is directed toward the base station, and the antenna element group B is directed toward the base station radio wave in the room. The effect is higher when turned.

With this configuration, the degree of freedom in the direction of the antenna element groups A and B is increased.
The effect described in can be further enhanced. Third Embodiment FIGS. 3A and 3B are diagrams showing a third embodiment of the present invention. FIG. 3A is a diagram showing an antenna configuration, and FIG. 3B is a diagram showing a connection state of the antenna.

[0010] In this case, each of the antenna element groups A and B has a structure in which four circular microstrip antenna elements 11 are linearly arranged side by side, and their back surfaces are aligned. Further, as shown in FIG. 3B, the connection state of each antenna is such that the elements 11 of the antenna element group A7 are A1 to A4, the elements 11 of the antenna element group B8 are B1 to B4, the elements A1 and B1, A2 and B2, elements A3 and B3, elements A4 and B
4 are installed facing each other. Elements A1 and B
4, elements A2 and B3, elements A3 and B2, elements A4 and B1
Are connected. Further, in this case, the feed line 12 of each antenna element is drawn out from the antenna element group B8 for its own station signal, and is connected to the wireless communication device 3 through an appropriate feed circuit 13.

With such a configuration, information on the own station can be obtained from the antenna element group B8. Further, the radio wave 14 incident on the antenna element group A7 changes its direction and changes its direction.
Re-emitted. Here, if the electrical lengths of the lines connecting the antenna feeding points are all the same, as shown in FIG. 3B, the direction (θ becomes a line symmetric with respect to the antenna surface (element arrangement surface)) The same). The direction of the re-radiated radio wave can be controlled by changing the electrical length of the line connecting each antenna feed line. Further, as shown in FIG. 4, a high effect can be obtained by inserting the bidirectional amplifier 16 between the antenna elements in the connection between the antenna elements. The two-way amplifier 16 includes two amplifiers 9 and 2 as shown in FIG.
One circulator 10 is bidirectional.
In FIG. 4A, the power supply line 12 to the wireless communication device 3 is omitted. The bidirectional amplifying device 16 is less likely to oscillate because the antenna elements are facing back.

With this configuration, the antenna is integrated and the antenna becomes more compact, but the same effect as in the first embodiment can be obtained. Fourth Embodiment FIGS. 5A and 5B are diagrams showing a fourth embodiment of the present invention, wherein FIG. 5A is a diagram showing an antenna configuration, and FIG. The antenna element 11 has a horizontal polarization feeding point 17 and a vertical polarization feeding point 18. In this case, each of the antenna element groups A and B has a structure in which four circular microstrip antenna elements 11 are arranged side by side in a straight line, and their back surfaces are joined together. Each antenna element 11 has two horizontal and vertical feed points 1
It has 7, 18. The four elements 11 in each of the antenna element groups are A1 to A4 and B1 to B4, respectively, and the elements A1 and B
1, elements A2 and B2, elements A3 and B3, elements A4 and B4
Are installed facing each other. Further, as shown in FIG. 5B, the connection state of each antenna is such that the vertically polarized feed point 1 of each of the antenna elements A1 to A4 and B1 to B4 is provided.
8 are A1V to A4V and B1V to B4V, respectively, and the horizontal polarization feeding points 17 are A1H to A4H and B1H to respectively.
If B4H, A1V and B4H, A2V and B3H, A
3V and B2H, A4V and B1H, A1H and B4V, A2
Feed points H and B3V, A3H and B2V, and A4H and B1V are connected via a bidirectional amplifier 16 (FIG. 4B). Further, in this case, the horizontal and vertical polarization feed lines 12H and 12V are drawn out from the horizontal and vertical polarization feed points of the antenna elements B1 to B4 of the antenna element group B8, and appropriate feed circuits 13H and 13V are provided. And these are connected to the wireless communication device 3 through the diversity switching device 20.

With such a configuration, the signal of the own station is received by the polarization diversity, and the relay function is to re-emit the vertically polarized incident light as a horizontally polarized light, and conversely, to receive the horizontally polarized light. The wave incidence is re-emitted as vertically polarized. As a result, the antenna elements face each other and the polarization is also different, so that it is difficult to oscillate. further,
The operation of this communication device will be described with reference to FIG. FIG. 6 is a diagram showing a radio wave propagation state in a room when viewed from above. Here, the base station 1 radiates both vertical and horizontal polarized waves, the radio communication device 31 is surrounded by the obstacle 4, and the person 4 is standing in front of the radio communication device 32. In this way, the base station 1 radiates radio waves 5 of both vertically and horizontally polarized waves. As a result, as shown in FIG. 6, the signal is successively relayed by the wireless communication device 3 of the terminal and is re-emitted as a radio wave 6. As described above, transmission is performed without discrimination between horizontal and vertical polarizations, but each terminal and the base station have a vertical / horizontal diversity function.
As can be seen from this figure, even when the base station 1 is placed at the corner of the room, the radio wave reaches the wireless communication device 31 surrounded by the obstacle 4 and a human stands like the communication device 32. In this state, radio waves from another direction arrive and communication is possible.

Although this example has been described with reference to horizontal / vertical polarization, a right-handed or left-handed polarization feed point is provided in the antenna element so that the same operation can be performed with right-handed and left-handed polarized waves. The same effect is obtained. That is, by using the communication device of the present invention, even if the base station is located at the corner of the room, radio waves arrive at every corner of the room, and radio waves arrive at one wireless communication device from various directions. Will do. This allows the base station to be placed in a low position, such as a desk, so that no work is required, and without specially designing the terminal layout,
There is an effect that communication can be performed even with a terminal having furniture and a person who is obstructed from seeing the base station.

[0015]

As described above, according to the present invention, the communication apparatus is movable, has a transmission function, a reception function, and a relay function, and the antenna element groups A and B can be directed in any directions. The information of the own station is transmitted and received by both or one of the antenna element groups A and B, and the antenna element groups A and B
The radio wave received from one of them is radiated from the other, so that the base station is placed in a low position such as a desk so that no construction is required and fixtures and fixtures can be installed without specially designing the terminal arrangement There is an effect that communication is possible even with a terminal having a person and being blocked from seeing the base station.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

2A and 2B show a second embodiment of the present invention, in which FIG. 2A is a perspective view showing the entire configuration of a communication device, and FIG. 2B is a circuit diagram thereof.

3A and 3B show a third embodiment of the present invention, wherein FIG. 3A is a perspective view of an antenna configuration, and FIG. 3B is a diagram showing a connection state between antenna elements.

4A and 4B are diagrams showing a connection state of an antenna element, in which an amplifier is inserted in a connection between each antenna element, and FIG.
FIG. 4 is a diagram showing one of the inter-element characteristics.

5A and 5B show a fourth embodiment of the present invention, wherein FIG. 5A is a perspective view showing an antenna configuration, and FIG. 5B is a diagram showing a connection state between antenna elements.

FIG. 6 is a plan view showing a radio wave propagation state in a room when the communication device according to the fourth embodiment is used.

7A and 7B show a conventional communication device, in which FIG. 7A is a diagram in which a base station antenna is installed on an indoor ceiling, and FIG. 7B is a diagram in which a base station antenna is installed on a desk or the like.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K072 AA01 BB25 BB27 CC04 DD11 DD16 DD17 EE01 EE13 EE32 GG02 GG04 GG05 GG12 GG13 GG14 GG26

Claims (6)

[Claims] 1. A communication device for wirelessly transmitting and receiving information to and from devices scattered in an arbitrary place, wherein the communication device is movable and has a radio signal receiving function, a transmitting function, and a relay function. A communication device having: 2. The communication device according to claim 1, comprising two antenna element groups A and B, each of which includes one or more antenna elements. B can be directed in any direction, and its own information is transmitted and received from both or one of the antenna elements A and B, and the radio wave incident from the antenna element group A is transmitted to the antenna element group B.
A communication device which emits a radio wave radiated from the antenna element group A and radiated from the antenna element group A. 3. The communication device according to claim 2, wherein the antenna element groups A and B include antenna elements A1 to A, respectively.
n, B1 to Bn are linearly arranged, and the antenna element groups A and B face each other with the back of the antenna facing each other, and the antenna element Br (r
= 1 to n), and the feed point of the antenna element Ak and the antenna element Bm (m = n
+ 1-k, k = 1 to n / 2) are connected to each other directly or via an amplifier. 4. The communication device according to claim 3, wherein each antenna element is capable of transmitting and receiving both vertically and horizontally polarized waves, and a feed point of the horizontally polarized wave of the antenna element Ak and the antenna element Bm.
(M = n + 1-k, k = 1 to n / 2) are respectively directly connected to the vertical polarization feeding point of the antenna element Ak and the antenna element Bm (m = n + 1-k, k = 1 to n / 2), which are directly connected to each other or connected via an amplifier. 5. The communication device according to claim 3, wherein each antenna element can transmit and receive both right-handed and left-handed circularly polarized waves. Antenna element B
m (m = n + 1-k, k = 1 to n / 2) are directly connected to the left-handed circularly polarized wave feeding points, respectively, and the antenna element Ak
And the antenna element Bm (m = n + 1−
(k, k = 1 to n / 2) right-handed circularly polarized wave feeding points are directly connected to each other, or are connected to each other via an amplifying device. 6. The communication device according to claim 4, wherein transmission and reception of own station information is performed by a polarization diversity operation of an arbitrary antenna element or an antenna element group.