JP2005286812A - Composite leakage coaxial cable for wireless lan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite leakage coaxial cable for wireless LANs capable of being laid extremely easily in a state that the positions of slots are fixed, capable of widening its radiation range, and capable of handling frequencies in a wide band. <P>SOLUTION: The composite cable is provided with two leakage coaxial cables 11A, 11B having different specification bands arranged in parallel, and a casing 12 which integrally unites these coaxial cables 11A, 11B in their lengthwise direction. The position of each slot 17 of the two coaxial cables 11A, 11B is directed in the same direction. When the specification bands are 2.4 GHz and 5.2 GHz, respective bands are covered by the individual coaxial cables 11A, 11B, complexity of design and manufacture of the individual leakage coaxial cables can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite leaky coaxial cable for a wireless LAN used for an application suitable for system construction in a high frequency band such as an indoor wireless LAN.

  In recent years, the use of a leaky coaxial cable as an access point for an indoor wireless LAN (local area network) has been studied. For example, as shown in FIG. 6, the leaky coaxial cable 1 is wired in a U shape in an area 2 such as a floor or a ceiling. Connected to the access point 5 are a LAN cable 8B connected to a host computer and a server and a power cable 8A for driving the access point 5. The access point 5 and the leaky coaxial cable 1 are connected through a connector 4 using a normal coaxial cable 6. Since there is no device such as the access point 5 on the leaky coaxial cable 1 side, it is not necessary to supply power. A terminating resistor 3 is connected to the end of the leaky coaxial cable 1.

  In this way, radio waves are transmitted from the leaky coaxial cable 1 over its entire length. Compared to transmission and reception of radio waves at a single point, it is not affected by the layout of indoor metal shelves or partitions. Further, since it is only necessary to install the access point 5 in one place, wiring work and maintenance inspection are considerably simplified.

  Leakage coaxial cable can be laid out freely by laying under the ceiling or under the floor as compared with the conventional wireless antenna type AP (access point). Can be resolved. For this reason, it can be applied to a home wireless LAN by laying it on the ceiling or under the floor of a general home. In addition, by laying a leaky coaxial cable on a shelf or the like, it can be used as an antenna such as a barcode reader or an IC tag for managing the products arranged on the shelf or the actual product.

The leaky coaxial cable used for such an application needs to be laid with the direction of the leak slot directed in the radiation direction. Conventionally, since the cable is laid with a messenger wire, the slot is always wired in a fixed direction, and the radiation direction is also fixed.
However, since the leaky coaxial cable used in the indoor LAN does not require a messenger wire, it is necessary to wire the slot of the leaky coaxial cable in a predetermined radiation direction.
JP-A-7-106845

By the way, the above technique has the following problems to be solved.
The conventional leaky coaxial cable used in tunnels and underground spaces has a specification band of 150 MHz to 1500 MHz, but the leaky coaxial cable used for indoor wireless LAN etc. has a wide band in the high-frequency region of 2.4 GHz or 5.2 GHz. It is necessary to cope with.

  A leaky coaxial cable used for an indoor wireless LAN is desired to be excellent in flexibility and to be as narrow and wide as possible. In practical use, an insulator having an outer diameter of 20 mm or less is preferable. Such a leaky coaxial cable is not provided with a messenger wire. Therefore, it is difficult to lay the position of the slot of the leaky coaxial cable in a predetermined direction.

In addition, it has been considered that a mark such as a protrusion is provided at a position opposite to the position of the slot in advance, but the manufacturing process becomes complicated, and if the cable is twisted during laying, the mark such as the protrusion is fixed in a certain direction Difficult to place towards
Further, when a leaky coaxial cable is used in an indoor wireless LAN, the slot pitch becomes finer and the manufacturing becomes difficult as the frequency becomes higher, so it is difficult to increase the bandwidth with a single cable.

In particular, when used in the high frequency region of 5.2 GHz, the transmission loss increases, so it is necessary to install an amplifier in the middle. For this reason, when the amplifier is a unidirectional amplifier, transmission / reception with one leaky coaxial cable cannot be performed.
In addition, a composite leaky coaxial cable is known in which a leaky coaxial cable for low band and a leaky coaxial cable for high band are arranged in parallel via a messenger wire and are integrally connected by a common sheath (see Patent Document 1). .

  This composite leaky coaxial cable functions in a band of 150 to 1500 MHz for disaster prevention radio and mobile communication in places where radio waves are insensitive such as tunnels and underground parking lots. The present invention relates to a leaky coaxial cable used in an indoor wireless LAN and used in a high frequency region of 2.4 GHz or 5.2 GHz.

  The present invention has been made to solve the above-described problems, and it is extremely simple to install with the slot position fixed, and can be used for a wireless LAN that can widen the radiation range and cope with a wide band of frequencies. An object is to provide a composite leaky coaxial cable.

In each embodiment of the present invention, the above-described problems are solved by the following configurations.
<Configuration 1>
Each of the two leaky coaxial cables is provided with two leaky coaxial cables arranged in parallel and having different specification bands and a jacket for integrally connecting the two leaky coaxial cables in the length direction. A composite leaky coaxial cable for wireless LAN, characterized in that the positions of the wireless LAN are directed in the same direction.

  When the specification bands are 2.4 GHz and 5.2 GHz, each leaky coaxial cable covers each band, so that the complexity of designing and manufacturing each leaky coaxial cable can be reduced.

<Configuration 2>
Each of the two leaky coaxial cables is provided with two leaky coaxial cables arranged in parallel and having different specification bands and a jacket for integrally connecting the two leaky coaxial cables in the length direction. A composite leaky coaxial cable for wireless LAN, wherein the positions of the wireless LAN are directed in different directions.

  It is possible to respond quickly to different upper and lower bands by laying only one cable.

<Configuration 3>
Each of the two leaky coaxial cables is provided with two leaky coaxial cables having the same specification band and a jacket for connecting the two leaky coaxial cables integrally in the length direction, which are arranged in parallel. A composite leaky coaxial cable for wireless LAN, characterized in that the positions of the wireless LAN are directed in the same direction.

Each leaky coaxial cable can be used separately for the forward path and the return path. Alternatively, the radiation range can be expanded when each leaky coaxial cable covers a round-trip path.
For example, when used in the 5.2 GHz band, the transmission loss is larger than in the 2.4 GHz band, but by using a single directional amplifier in the middle of the laying path, transmission is performed with one composite leaky coaxial cable. And receive.

<Configuration 4>
Each of the two leaky coaxial cables is provided with two leaky coaxial cables having the same specification band and a jacket for connecting the two leaky coaxial cables integrally in the length direction, which are arranged in parallel. A composite leaky coaxial cable for wireless LAN, wherein the positions of the wireless LAN are directed in different directions.

  By making each leaky coaxial cable cover a reciprocal path, it is possible to efficiently cope with a complicated or wide-range wireless LAN area such as a multistage shelf.

  Hereinafter, embodiments of the present invention will be described in detail for each example.

  FIG. 1 is an explanatory diagram illustrating a composite leaky coaxial cable for wireless LAN according to a first embodiment. In FIG. 1, a composite leaky coaxial cable 10 includes two leaky coaxial cables 11A and 11B arranged in parallel, and a jacket 12 that integrally connects the leaky coaxial cables 11A and 11B in the length direction. ing. The jacket 12 is provided by a conventional extrusion coating.

  FIG. 2 is an explanatory diagram showing a specific configuration of the leaky coaxial cables 11A and 11B. FIG. 2A is a side view of the leaky coaxial cables 11A and 11B. The outer conductor 13 integrated with the jacket 12 is provided with a number of slots 17. A predetermined amount of electromagnetic waves are emitted from the slot 17 and communication with a terminal device arranged in the vicinity of the cable becomes possible. As shown in FIG. 2B, the leaky coaxial cables 11 </ b> A and 11 </ b> B are obtained by covering the outer periphery of the center conductor 15 with an insulator 14, an external conductor 13, and a jacket 12.

  Electromagnetic waves are emitted in the direction in which the slots 17 of the leaky coaxial cables 11A and 11B are present. For example, when the leaky coaxial cables 11A and 11B are arranged behind the ceiling, the cables 11A and 11B are laid so that the slot 17 is arranged on the lower side. As a result, the signal is efficiently radiated to the terminal device side, and the signal can be efficiently received from the terminal device to transmit and receive data.

  FIG.2 (c) is a perspective view which shows the terminal of leaky coaxial cable 11A, 11B. As shown in this figure, the outer conductor 13 wound around the outer peripheral surface of the insulator 14 is integrated with the jacket 12, and the slot 17 is always arranged so as to face a certain direction with respect to the cable. ing. Therefore, for example, if a mark or the like indicating the position of the slot is provided on the outer side of the jacket 12, the cable can be laid in an appropriate direction.

  FIG. 3 shows an example in which the slots of the two leaky coaxial cables 11A and 11B integrated with the jacket 12 are oriented in the same direction in advance. In this example, when two leaky coaxial cables 11A and 11B are arranged in the horizontal direction with the coupling portion as the middle, each slot is configured to be directed downward.

  When the two leaky coaxial cables 11A and 11B have the same specification band, for example, the 2.4 GHz band or the 5.2 GHz band, the two beams 40A and 40B can be radiated in a wide range downward. When there is a terminal device in the direction of these beams 40A and 40B, good communication is possible. Of course, the two leaky coaxial cables 11A and 11B can be used as different specification bands.

  FIG. 4 shows an example in which the slots of the two leaky coaxial cables 11A and 11B are manufactured in advance so as to face different directions. In this example, when the two leaky coaxial cables 11A and 11B are arranged in the horizontal direction with the coupling portion in the middle, the slot of one leaky coaxial cable 11A faces upward, and the other leaky coaxial cable. Each of the cables 11B is configured to face downward.

  As shown in FIG. 4, when two beams 40A and 40B are radiated in the vertical direction, respectively, and there is a terminal device in the direction of these beams 40A and 40B, good communication is possible. Also in this case, the specification bands of the two leaky coaxial cables 11A and 11B may be the same or different.

  With the configuration shown in FIGS. 3 and 4, the slots of the leaky coaxial cables 11A and 11B can be accurately positioned, and unfavorable coupling between them can be prevented. Furthermore, both slots can be directed in an optimum direction, and a good network can be formed. In addition, since the two cables can be installed at the back of the ceiling, under the floor, or on the wall, the LAN installation work can be performed accurately in a short time.

FIG. 5 is an explanatory view showing an example of laying the composite leaky coaxial cable of the present invention over a long distance.
As shown in FIG. 5, in this laying example, a plurality of composite leaky coaxial cables 10A, 10B, and 10C to be connected to each other are subjected to terminal processing, amplifiers are connected via connectors at both ends, and coaxials extended from the access point Connect to cables 26 and 36.

  For example, when one leaky coaxial cable 11A of the composite leaky coaxial cable is used for the uplink and the other leaky coaxial cable 11B is used for the downlink, each of the composite leaky coaxial cables 10A and 10B is connected to the connectors 24 and 34. Amplifiers 23A and 33A are inserted. In addition, amplifiers 23B and 33B are inserted between the composite leaky coaxial cable 10B and the composite leaky coaxial cable 10C. In this way, the composite leaky coaxial cables are sequentially connected through the amplifier until the predetermined length is reached. A coaxial cable 26 and a coaxial cable 36 are connected from the access point 25 via the interface 27.

  A signal transmitted in the downstream direction from the access point 25 with the above configuration is transferred through the coaxial cable 26 and the connector 24 through the composite leaky coaxial cable 10A. Then, the signals are amplified by the amplifiers 23A and 33A and transmitted again through the composite leaky coaxial cable 10B. Thereafter, the signals are amplified by the amplifiers 23B and 33B and transmitted through the leaky coaxial cable 10C. Data is transmitted to the terminal devices arranged in the vicinity of these composite leaky coaxial cables 10A, 10B, and 10C. The signal transmitted from the terminal device is received by any of the composite leaky coaxial cables 10A, 10B, and 10C, transmitted through these cables, and sent to the access point 25.

1 is an explanatory diagram illustrating a composite leaky coaxial cable for wireless LAN according to a first embodiment. It is explanatory drawing which shows the specific structure of the leaky coaxial cable of this invention. It is explanatory drawing which shows the two leaky coaxial cables which orient | assigned the position of each slot to the same direction. It is explanatory drawing which shows the two leaky coaxial cables which orient | assigned the position of each slot to the different direction. It is explanatory drawing which shows the example of installation of the composite leaky coaxial cable of this invention. It is explanatory drawing of indoor wireless LAN in the case of forming using the cable line for wireless LAN.

Explanation of symbols

10 composite leaky coaxial cable 11A, 11B leaky coaxial cable 12 jacket 13 outer conductor 14 insulator 15 center conductor 17 slot

Claims (4)

Two leaky coaxial cables with different specification bands, arranged in parallel,
A jacket for integrally connecting the two leaky coaxial cables in the length direction;
A composite leaky coaxial cable for a wireless LAN, wherein the slots of the two leaky coaxial cables are oriented in the same direction. Two leaky coaxial cables with different specification bands, arranged in parallel,
A jacket for integrally connecting the two leaky coaxial cables in the length direction;
A composite leaky coaxial cable for wireless LAN, wherein the positions of the slots of the two leaky coaxial cables are directed in different directions. Two leaky coaxial cables with the same specification band, arranged in parallel,
A jacket for integrally connecting the two leaky coaxial cables in the length direction;
A composite leaky coaxial cable for a wireless LAN, wherein the slots of the two leaky coaxial cables are oriented in the same direction. Two leaky coaxial cables with the same specification band, arranged in parallel,
A jacket for integrally connecting the two leaky coaxial cables in the length direction;
A composite leaky coaxial cable for wireless LAN, wherein the positions of the slots of the two leaky coaxial cables are directed in different directions.

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