JPS60144029A - Radio equipment - Google Patents

Abstract

PURPOSE:To maintain a circuit even if an obstacle is interposed between antennas, in case of a communication between buildings, etc., by providing a sub- antenna and a passive reflector in each front of opposed main antennas, and providing a level difference between the radio wave concerned and a radio wave of a direct propagation path. CONSTITUTION:A direct route 19 and a detour route 21 for propagating a radio wave are formed by main antennas 11, 12, sub-antennas 13, 14, and passive reflectors 15, 16 in buildings A, B. In this case, a constitution of each sub-antenna and each passive reflector and each propagation route length are selected so that a radio wave of the detour route becomes weaker enough then that of the direct route. Also, for instance, when a gondola 23 cuts off the direct route 19, the radio wave propagation is executed by only the detour route 21. In this case, a receiving electric field drops comparing with the case of the direct route, but when a transmitting power and a receiving gain are made to have allowance, the circuit can be maintained by only the detour route.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a wireless device used between buildings, etc.
In particular, the present invention relates to a wireless device that can communicate without problems even when an obstacle is present in the radio wave propagation path between antennas.

Prior Art and Problems It is sometimes necessary to communicate wirelessly between buildings facing each other, and wireless devices used for such purposes have been developed. The installation method for such wireless devices is also required to be simple, and if possible, the main body and antenna are installed inside the glass window of a building, and communication is performed by sending and receiving radio waves between them through the glass. This is desirable. However, in this case, gondolas are usually hung outside the windows of buildings to clean the glass windows, and in this case, the radio wave propagation path between the antennas of both stations is blocked by the gondolas. This may cause communication to become impossible.

For this reason, conventionally, antennas have not been installed inside the glass windows of buildings, but antennas have to be installed on the rooftops of buildings or in locations where there is no risk of blocking the radio wave propagation path.
Alternatively, methods have been used, such as using two systems of wireless devices with different radio wave propagation paths in parallel.

FIG. 1 shows an example of installing a wireless device in conventional inter-building communication, and shows a case where an antenna is installed on a rooftop. In the same figure, 8.

B is the building opposite each other, l is the wireless device installed in building A, 2 is the wireless device installed in building B, 3.4 is the cable, and 5 is the A building wireless installed on the roof of building A. The device antenna 6 is an antenna for the 13 building wireless device installed on the roof of the 13 building.

In FIG. 1, a signal transmitted from a wireless device 1 in Building A is sent to an antenna 5 via a cable 3, and is sent out from the antenna 5 as a radio wave.

This radio wave enters the anti-alloy in Building B, and is sent to and received by the wireless device 2 in Building B via the cable 4. When transmitting a signal from the wireless device 2 in Building B to the wireless device I in Building A, the signal transmission is performed in the same manner in the reverse order.

In this way, in conventional inter-building wireless devices, if the antenna is installed on the roof ring, there is no risk that the radio wave path will be blocked by cleaning the building's windows and therefore become unable to communicate, but on the other hand, the antenna There were other problems in that it required a lot of money to install the antennas and the cables between the radio device antennas, and maintenance of the antennas and cables was not easy. Furthermore, when two lines of wireless equipment are installed, costs inevitably increase.

Purpose of the Invention The present invention is intended to solve the problems of the prior art, and its purpose is to provide a wireless device that performs inter-building communication, etc., even when there are obstacles between the antennas. To provide a wireless device which can maintain a line and, therefore, has no risk of communication interruption due to window cleaning etc. even if an antenna is installed inside a glass window of a building.

Embodiment of the invention FIG. 2 shows an embodiment of the invention, in which opposing buildings A and B
This section explains the installation of a dual-layer line device that communicates between the two layers and its antenna. In the figure, ■ is a wireless device for building A, and 2 is a wireless device for building B, which correspond to the devices with the same numbers in FIG. In addition, 11 is the main antenna of the wireless device for building A, 12 is the main antenna of the wireless device for building B, 13.14 is a sub antenna, 15.16 is a reflector, 17
．． 18 are the glass windows of Building A and Building B, respectively, 19
, 20, 21, and 22 are radio wave propagation paths, and 23 is a gondola.

In FIG. 2, main antennas 11 and 12 are installed inside the glass window 17 of Building A and the glass window 18 of Building B, respectively, and are positioned so that their respective principal axes face each other. The sub-antennas 13, 14 each consist of a small reflecting plate provided in front of the main antenna 11, 12, and reflect the radio waves of the main antenna, for example, at right angles.

The reflectors 15 and 16 reflect the radio waves transmitted and received via the sub-antennas 13 and 14, for example, at right angles, and are provided above the glass windows 17 and 18, respectively.

The signals transmitted from the wireless device 1 in Building A are normally transmitted as radio waves from the main antenna 11, and most of them are transmitted through the glass windows 17. Through the path 19 and the glass window 18, the signal reaches the wireless device 2 and is received by a direct route that is incident on the main antenna 12 of Building B, which is provided oppositely. Similarly, in Building B, 11 signals are normally sent from the wireless device 2 as radio waves from the main antenna 12, and 11 signals are sent from the glass window 18. The signal reaches the wireless device 1 and is received by a direct route through the path 19 and the glass window 17 and into the main antenna 11 of Building A, which is located opposite to it. At this time, a part of the signal from the wireless device I is transmitted to the main antenna 1.
1, is reflected by the sub-antenna 13 in the antenna 1, enters the reflector 15 via a path 20, is reflected by the reflector 15, enters the reflector 16 via a path 21, is reflected again by the reflector 16, and enters the path 22. and enters the sub-antenna 12 through the sub-antenna 12.
The signal is reflected by the radio device 2 and is received via a detour route. Similarly, a part of the signal from the wireless device 2 is reflected by the sub antenna 14 in the main antenna 12, enters the reflector 1G via a path 22, is reflected by the reflector 16, and then passes through the path 21.
It enters the reflector 15 via the reflector 15, is reflected again by the reflector 15, passes through the path 20, enters the sub-antenna 11, and then enters the sub-antenna 1.
1 and reaches the wireless device 1, which is received by a detour route opposite to that described above.

In this case, radio equipment 1.2 simultaneously receives the radio waves that have passed through the direct route and the radio waves that have passed through the detour route, but the radio waves that have taken the detour route are sufficiently weaker than the radio waves that have gone through the direct route, and each sub-antenna By selecting the size and configuration of each reflector and the length of each propagation path, it is easy to reduce the radio waves to, for example, about -20 dB compared to the radio waves that have passed through the direct route. Due to the existence of the radio waves that have passed through the route, the level of the radio waves that have passed through the direct route only increases or decreases within a range of about ±1 dB, and has almost no effect. Further, the error in delay time based on the difference in path length between the direct route and the detour route can be ignored in the case of a small capacity signal within a range of several meters. Therefore, it is possible to perform communication in a state where such a direct route and a detour route coexist.

Now, as shown in Figure 2, when the gondola 23 is suspended and blocks the direct route I9, the radio wave propagation between the field radio equipment 1 and 2 will pass through the top of the window glass. This is done only by a detour route via routes 20.21.22. In this case, the received electric field will be lower than when the direct route is intact, and in the case of the previous example, it will be about 20 d.
However, if a sufficient margin is provided in advance for transmission power and reception gain, it is possible to maintain the line using only the detour route. In this case, when the direct route is active, the reception input will be excessive, but automatic gain adjustment (8GC)
This can be covered by providing a device to automatically adjust the receiving gain.

As described above, according to the present invention, there is no need to install two systems of wireless equipment, and there is no need to install an antenna on the rooftop. Instead, the wireless equipment can be installed inside the window glass of the opposite building, and a highly reliable line can be established. Can be configured.

As described in detail, according to the wireless device of the present invention, in a pair of wireless devices that communicate via a direct propagation path formed between the antennas disposed opposite to each other, each antenna A sub-antenna that reflects and deflects the radio waves transmitted and received via the antenna is provided in front of the sub-antenna, and a detour propagation path is created between the radio waves transmitted and received via each sub-antenna and the reflector of the other device. A reflector plate forming the antenna is provided opposite each sub-antenna, and a level difference is created between the radio waves transmitted by the detour propagation path and the radio waves propagated by the direct propagation path, making communication between buildings possible. Wireless devices that perform this function can maintain the communication line even if there is an obstacle in the radio wave propagation path between the antennas. Therefore, even if the antenna of the wireless device is installed inside the glass window of a building, Communication will not be hindered by window cleaning gondolas, etc.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of installation of a wireless device in conventional inter-building communication, and FIG. 2 is a diagram showing an embodiment of the wireless device of the present invention. 1.2-m-wireless device, 3.4-cable, 5,6-antenna, 11.12-main antenna, 13.14--sub antenna, 15.16--reflector, 17.18-・Glass window, 19°20.21.22--Radio wave path, 23
--Gondola patent applicant Fujitsu Limited

Claims (1)

[Claims] In a pair of wireless devices that perform °ζ communication through a direct propagation path formed between respective antennas installed facing each other,
In addition to providing a sub-antenna that reflects and deflects the radio waves transmitted and received, each of the sub-antennas is equipped with a reflector plate that reflects and deflects the radio waves transmitted and received through each sub-antenna and forms a detour propagation path between it and the reflector plate of the other device. 1. A radio device, characterized in that the wireless device is provided opposite to the sub-antenna, and a level difference is provided between the radio waves transmitted by the detour propagation path and the radio waves propagated by the direct propagation path.