KR20140094210A - The antenna system for MIMO communication in tunnel - Google Patents

The antenna system for MIMO communication in tunnel Download PDF

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Publication number
KR20140094210A
KR20140094210A KR1020130006664A KR20130006664A KR20140094210A KR 20140094210 A KR20140094210 A KR 20140094210A KR 1020130006664 A KR1020130006664 A KR 1020130006664A KR 20130006664 A KR20130006664 A KR 20130006664A KR 20140094210 A KR20140094210 A KR 20140094210A
Authority
KR
South Korea
Prior art keywords
antenna
tunnel
cable
general
antennas
Prior art date
Application number
KR1020130006664A
Other languages
Korean (ko)
Inventor
김재희
이병송
이형우
박찬배
이준호
류상환
조봉관
황현철
Original Assignee
한국철도기술연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국철도기술연구원 filed Critical 한국철도기술연구원
Priority to KR1020130006664A priority Critical patent/KR20140094210A/en
Publication of KR20140094210A publication Critical patent/KR20140094210A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15507—Relay station based processing for cell extension or control of coverage area
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

The present invention, for a multiple inputs multiple outputs (MIMO) system to provide a possible communications environment capable of transmitting and receiving inside a tunnel, provides the MIMO system in a tunnel configured to comprise one or more cable antennas located in the tunnel; and one or more general antennas located near an exit or an entrance of the tunnel, wherein the cable antenna and the general antenna have different polarization directions from each other. Therefore, the present invention has an effect to provide the MIMO antenna system having low radio interference in the tunnel and high degrees of freedom in the polarization direction of the antenna.

Description

[0001] The present invention relates to a multi-input /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna system, and more particularly, to an antenna system capable of performing multiple input / output operations in a tunnel.

Recently, various wireless communication technologies have been developed along with the development of information communication technologies. In addition, in recent years, high-speed data transmission is required in a wireless communication environment. However, there is a limit to wireless resources available, and a method of increasing a throughput of wireless communication is increasing. In order to realize this, a MIMO (Multi Input Multi Output) system is used in which data is transmitted using several antennas and data is received using several antennas as shown in FIG. However, it is difficult to apply the multi-input / output antenna system in the indoor environment because it is difficult to apply it in special environments such as tunnels. Also, since the environment where the radio waves can reach is located at the entrance of the tunnel, The input / output antenna system environment is not easily made and it is not easy to increase the data transmission rate.

Japanese Unexamined Patent Publication No. JP-A-2011-199760A, which is a prior art that proposes a multi-input / output antenna system in a tunnel, provides an antenna system using a plurality of coaxial cables. By configuring the plurality of coaxial cables in different slit directions, it is possible to configure a multi-input / output antenna system in a tunnel and to reduce radio interference.

However, when the leakage coaxial cable is used as in the antenna system described above, the degree of freedom in the polarization direction is low, so that it is not easy to change the polarization direction when the polarization direction is changed due to the additional installation of the antenna. In addition, when several leakage coaxial cables are used as in the antenna system described above, there is a problem in that the leakage coaxial cable must be installed as much as the length of the tunnel, which increases the cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a communication environment structure capable of applying a multi-input / output antenna system technology having a high degree of freedom in polarization direction within a ground or a tunnel.

It is a further object of the present invention to provide a multi-input / output antenna system in a tunnel which is less expensive, by using a common antenna and a cable antenna together.

In one aspect of the present invention, there is provided a MIMO antenna system for providing a communication environment capable of transmitting and receiving in a tunnel, comprising: at least one cable antenna located in the tunnel; And at least one general antenna located near the entrance or exit of the tunnel.

Preferably, the cable antenna is located in the vicinity of at least any one of a side wall, a ceiling, and a ground in the tunnel.

Preferably, the cable antenna and the general antenna have polarization directions different from each other.

Preferably, the cable antenna and the general antenna have polarization directions perpendicular to each other.

Preferably, the cable antenna has a coaxial linear structure or a waveguide structure.

Preferably, the general antenna is a patch antenna or a dipole antenna.

According to another aspect of the present invention, there is provided a vehicular antenna system for providing a communication environment capable of transmitting and receiving in a tunnel, the antenna system being disposed in a portion of a vehicle facing the cable antenna for transmitting and receiving signals with the cable antenna in the tunnel At least one first antenna; And at least one second antenna disposed on at least one of a front portion and a rear portion of the vehicle for transmitting and receiving signals to and from the general antenna, wherein the first antenna and the second antenna have different polarization directions The present invention provides an antenna system for a vehicle.

Preferably, the first antenna is a patch antenna.

Preferably, the second antenna is a monopole antenna.

The present invention relates to a wireless communication system and a wireless communication method, which are capable of performing wireless communication with a multi-input / output antenna system by using one or more cable antennas located in a tunnel and one or more general antennas located near a tunnel entrance or exit in a special environment such as a tunnel. .

Also, the present invention provides a communication environment structure capable of applying a multi-input / output antenna system having a high degree of freedom in a polarization direction in a ground or a tunnel by using a general antenna.

In addition, the present invention provides a multi-input / output antenna system in a tunnel, and has an effect of reducing a cost burden by using a general antenna and a cable antenna together.

1 is a view showing an embodiment of a conventional multi-input / output antenna system.
2A and 2B are views illustrating a multi-input / output antenna system in a tunnel according to an embodiment of the present invention.
3A and 3B are views showing the structure of a typical cable antenna.
FIGS. 4A, 4B and 4C are diagrams showing a typical general antenna structure.
FIG. 5 is a view illustrating an exemplary polarization direction of a cable antenna and a general antenna according to a preferred embodiment of the present invention.
6 is a view illustrating an antenna system for a vehicle according to a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

2A and 2B are views illustrating a multi-input / output antenna system in a tunnel according to an embodiment of the present invention.

2A and 2B, a multi-input / output antenna system in a tunnel includes one or more cable antennas 210 and one or more general antennas 220, and the cable antenna 210 and the general antenna 220, Are connected to the same base station 240.

The cable antenna 210 may comprise a coaxial linear structure 300 or a waveguide structure 310 and may be installed in the vicinity of at least one of any sidewalls, ceiling, and ground within the tunnel 230. The cable antenna 210 is disposed on at least one of a side surface, a top surface, and a bottom surface of the vehicle 601 so as to face the cable antenna 210 when the vehicle 601 passes through the tunnel 230. [ Lt; RTI ID = 0.0 > 610 < / RTI >

The general antenna 220 may include patch antennas 400 and 410 or a dipole antenna 420 and may be located near the entrance or exit of the tunnel 230 so as to transmit and receive radio waves to and from the tunnel 230 . The general antenna 220 transmits and receives a second antenna 620 disposed at a front portion or a rear portion of the vehicle 601 when the vehicle 601 passes through the tunnel 230. The term "near the entrance or exit of the tunnel 230" refers to a distance from the entrance or exit of the tunnel 230 to the extent that the general antenna 220 can transmit and receive a signal to the vehicle 601 in the tunnel 230 .

3 is a view showing the structure of a typical cable antenna 210. FIG. 3A is a cable antenna using a coaxial line, and FIG. 3B is a cable antenna using a metal waveguide.

The cable antenna 210 may be configured in various forms, and may be installed inside the tunnel 230 so that a radio wave may leak along the cable. The cable antenna of the coaxial linear structure 300 includes an inner conductor 301 corresponding to the center line of the coaxial line, a dielectric 302 surrounding the inner conductor 301, an outer conductor 303 surrounding the dielectric 302, A cover 304 surrounding the outer conductor 303, and a slot 305 spaced apart from the outer conductor by a predetermined distance so that the radio wave can be leaked to the outside through the cable.

The cable antenna of the waveguide structure 310 is composed of an empty metal tube 311 and a periodic slot 312 is formed in a part of the metal tube for radiating radio waves.

4 is a view showing the structure of a representative general antenna 220. FIG. 4A is a single patch antenna, FIG. 4B is an array patch antenna, and FIG. 4C is a dipole antenna.

The general antenna 220 may be configured in various forms and should be an antenna structure having a directivity capable of radiating a large amount of radio waves in the direction of the tunnel 230. The array structure of the patch antennas 400 and 410 and the array structure of the dipole antenna 420 can be seen in a typical structure, but it can be variously implemented according to the antenna design.

The patch antennas 400 and 410 are composed of grounds 401 and 411, metal patches 402 and 412 operated as an antenna, an outer conductor 404 for feeding and an inner conductor 403. The inner conductor 403 is electrically connected to the metal patches 402 and 412. The patch antennas 400 and 410 adopt an arrangement structure in which a plurality of antennas are dropped at regular intervals in order to have directivity as shown in FIG. 4B. The grounds 401 and 411 are commonly used, and the characteristics of the antenna are determined by adjusting the magnitude and phase of the signals transmitted to the metal patches 402 and 412.

The dipole antenna 420 is an antenna consisting of two conductors having two different poles. And adopts an arrangement structure for using the dipole antenna 420 as the general antenna 220.

5 is a diagram illustrating an example of polarization directions of a cable antenna 210 and a general antenna 220 according to a preferred embodiment of the present invention.

In order to optimize the performance of the MIMO system, the cable antenna 210 and the general antenna 220 are arranged so that their polarization characteristics are perpendicular to each other. 5A, if the polarization direction of the cable antenna 210 is horizontal, the polarized wave of the general antenna 220 can be vertical, and the polarized direction of the cable antenna 210 on the side of the tunnel 230, as shown in FIG. 5B, And if it is vertical, the polarization of the air antenna can be configured horizontally. 5C and 5D, when the cable antenna 210 is positioned at the top of the tunnel 230, the polarization direction of the cable antenna 210 is horizontal so that the polarized wave of the general antenna 220 can be vertically structured.

6 is a view illustrating an antenna system for a vehicle according to a preferred embodiment of the present invention.

The vehicle 601 of the vehicular antenna system may be configured in various forms and includes a first antenna 610 and a second antenna 620. [ The first antenna 610 is disposed at a portion of the vehicle 601 facing the cable antenna 210 as patch antennas 400 and 410 and transmits and receives the cable antenna 210. The second antenna 620 is a monopole antenna disposed at a front portion or a rear portion of the vehicle 601 and transmits / receives the general antenna 220. The first antenna and the second antenna may be plurally configured according to a preferred embodiment.

Accordingly, the present invention provides a multiple input / output antenna system in the tunnel 230.

210: Cable antenna
220: General antenna
230: Tunnel

Claims (9)

A multi-input / output antenna system for providing a communication environment capable of transmitting and receiving in a tunnel,
One or more cable antennas located within the tunnel; And
Including one or more general antennas located near the entrance or exit of the tunnel
And a plurality of I / O antennas in the tunnel.
The method according to claim 1,
Wherein the cable antenna is located in the vicinity of at least any one of a side wall, a ceiling, and a ground within the tunnel
And a plurality of I / O antennas in the tunnel.
The method according to claim 1,
The cable antenna and the general antenna have different polarization directions
And a plurality of I / O antennas in the tunnel.
The method of claim 3,
Wherein the cable antenna and the general antenna have polarization directions perpendicular to each other
And a plurality of I / O antennas in the tunnel.
The method according to claim 1,
The cable antenna is of a coaxial linear or waveguide type
And a plurality of I / O antennas in the tunnel.
The method according to claim 1,
The general antenna is a patch antenna or a dipole antenna
And a plurality of I / O antennas in the tunnel.
A vehicle antenna system for providing a communication environment capable of transmitting and receiving within a tunnel,
At least one first antenna disposed in a portion of the vehicle facing the cable antenna for transmitting and receiving signals to and from the cable antenna within the tunnel; And
And at least one second antenna disposed on at least one of a front portion and a rear portion of the vehicle for transmitting and receiving signals to and from a general antenna,
The first antenna and the second antenna have different polarization directions
The antenna system comprising:
8. The method of claim 7,
The first antenna is a patch antenna
The antenna system comprising:
8. The method of claim 7,
The second antenna is a monopole antenna
The antenna system comprising:
KR1020130006664A 2013-01-21 2013-01-21 The antenna system for MIMO communication in tunnel KR20140094210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130006664A KR20140094210A (en) 2013-01-21 2013-01-21 The antenna system for MIMO communication in tunnel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130006664A KR20140094210A (en) 2013-01-21 2013-01-21 The antenna system for MIMO communication in tunnel

Publications (1)

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KR20140094210A true KR20140094210A (en) 2014-07-30

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KR1020130006664A KR20140094210A (en) 2013-01-21 2013-01-21 The antenna system for MIMO communication in tunnel

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071753A (en) * 2018-01-23 2019-07-30 中天射频电缆有限公司 Rail traffic wireless communications method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071753A (en) * 2018-01-23 2019-07-30 中天射频电缆有限公司 Rail traffic wireless communications method and system
CN110071753B (en) * 2018-01-23 2024-03-15 中天射频电缆有限公司 Wireless communication method and system for rail transit

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