CN202268463U - Broadband leaky coaxial cable used for underground track wireless communication - Google Patents
Broadband leaky coaxial cable used for underground track wireless communication Download PDFInfo
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- CN202268463U CN202268463U CN2011203502228U CN201120350222U CN202268463U CN 202268463 U CN202268463 U CN 202268463U CN 2011203502228 U CN2011203502228 U CN 2011203502228U CN 201120350222 U CN201120350222 U CN 201120350222U CN 202268463 U CN202268463 U CN 202268463U
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Abstract
The utility model provides a broadband leaky coaxial cable used for underground track wireless communication. The broadband leaky coaxial cable includes an inner conductor, an outer conductor, an insulator disposed between the inner conductor and the outer conductor, and an insulating sheath outside of the outer conductor. Slots are arranged in the outer conductor. The slots include vertical slots and inclined slots. Aiming at actual conditions that different electromagnetic environment and requirements of platforms and tunnels exist in underground track traffic, the utility model discloses the novel ultra leaky cable having different radiation directions in different places and a design idea. In the utility model, cable leaking parts in stations are arranged to be in an all-direction radiation form while cable leaking parts in tunnels are designed to be only in a forward direction radiation form. Thus, not only the normal operation of wireless communication of underground track traffic can be guaranteed, but also energy loss and signal interference in a direction that does not need electromagnetic wave radiation are avoided.
Description
Technical field
The utility model relates to a kind of cable, the utility model also relates to a kind of mobile communication antenna.Specifically a kind of being applied in the underground rail traffic cordless communication network as the broadband leakage coaxial cable that transmits and receives radio signal.
Background technology
Leakage coaxial cable (Leaky Coaxial Cable; LCX); Be called for short and leak cable, also claim continuous antenna, it is to follow specific Theory of Electromagnetic Field; Disposing according to certain rules along the outer conductor of common coaxial cable that narrow periodicity or acyclic slotted eye form, is that a kind of existing transmission line character has the special cable that radio reception is sent out character again.Each otch along axial distribution on this cable outer conductor all is an electromagenetic wave radiation wave source, and therefore, when signal transmitted in cable, a part of electromagnetic energy can be radiated outside the space from otch with form of electromagnetic wave on request.The electromagnetic wave that leakage rediation goes out can be had the receiving equipment of certain distance to receive with cable by cable is along the line in the process of propagating, thus the communicating by letter of realization and external equipment; On the contrary; The signal that the outer mobile transmitter of cable is launched; Also can be through the notch on the outer conductor with being transferred to fixing receiver again in the electromagnetic wave feed cable, realize communicating by letter of external equipment and cable, so leak cable and possess with space outerpace and carry out the function that comprehensive duplexing zero-clearance is communicated by letter; Thereby remedied the existing communication blind district problem of employing traditional antenna communication mode, can be widely used in solving the message transmission problem that radio can't arrive or assist the arrival zone.
China is carrying out each item infrastructure construction at present; On aspect the communications and transportation; Because vast territory and abundant resources in China, there are means of transportation greatly all to be in semi-closure territory or the closed domain space, along the line like tunnel, subway and some highways; Along with the arrival of information age, these regional radio communications just become a urgent problem.When the radio wave in the mobile communication is propagated in geographic barrier things such as tunnel; Will produce serious fade-out and can not communicate by letter normally; This type of problem usually occurs in through in the highway in mountain range and river or the railway underground passage or in the wireless dispatch system of subway; Because the absorption of tunnel wall and the electromagnetic wave interference effect in communication process; Radio wave can receive serious loss, solves these interval interior electric wave zero-clearance covering problems and will make the communication system quality of China's public transport bring up to a higher level.When leaking cable after above-mentioned zone is laid; Will be full of the electromagnetic wave that radiates by the otch on the outer conductor in the space; The information of sending into from the outside will be received by radio station along the line or hand-held mobile terminal; Make the occasion that was considered to communication blind district originally realize zero-clearance communication, satisfied the demand of communication service between each sectors of operation, through improving the real-time and the reliability of communication system; Reach the purpose that reduces the traffic accident probability, and can important communication technology support be provided for road traffic control.Yet, in the underground rail traffic, there are the actual conditions of platform and tunnel different electric magnetic environment simultaneously, existing leakage cable can not address this problem.
Summary of the invention
The purpose of the utility model is to provide a kind of normally carrying out of underground rail traffic radio communication that both can guarantee, can guarantee on the direction that does not need electromagenetic wave radiation, to avoid the underground rail radio communication of energy loss and signal interference to use the broadband leakage coaxial cable again.
The purpose of the utility model is achieved in that
The underground rail radio communication of the utility model comprises inner conductor with the broadband leakage coaxial cable, external conductor, the insulator between inner conductor and external conductor, the insulating sleeve that external conductor is outer; External conductor is provided with fluting; Described fluting comprises vertical channel and inclined slot.
The fluting cycle of described fluting is P; Offer 1-4 notch in the one-period, each notch spacing is
The inclined notch inclination angle of inclined slot is
The utility model is a background with the information theory basic research of underground rail traffic broadband wireless communication network; Leakage coaxial cable (be called for short and leak cable) with as information transmitting medium is a research object; The actual conditions that have platform and tunnel different electric magnetic environment and demand to the underground rail traffic simultaneously; Proposed a kind of brand-new ultra broadband and leaked cable with the different radiation directions in strange land and design concept; The leakage cable that is about to the platform place partly is arranged to omnidirectional radiation; And the leakage cable at place, tunnel partly is arranged to have only forward radiation, and so both can guarantee normally carrying out of underground rail traffic radio communication, can guarantee on the direction that does not need electromagenetic wave radiation, to avoid energy loss and signal to disturb again.
For reliability and the fail safe that realizes the broadband wireless communication network information transmission system; To public security and fire-fighting (350-365MHz), railway wireless scheduling (458-468MHz), G net (825-1850MHz), 3G communication bands such as (1920-2400MHz), the utility model can suppress or eliminate scattering and fading effect, the covering 300-2400MHz frequency range of high order harmonic component effectively.
Vertical slot is arranged in the tunnel of underground rail, and inclined notch is arranged on the platform place of underground rail.Broadband leakage coaxial cable inner conductor can be aluminum pipe, copper pipe, also can be the good material of other conductivity.Insulator can be the physical blowing polyethylene pipe, or other insulator structure.External conductor can be thin aluminum sheet, and sheet copper also can be the good material of other conductivity.Insulating sleeve can be polyethylene pipe and also can be other insulator structure, can be according to for low cigarette, hang down fire-retardant, antiultraviolet, anticorrosion, characteristic requirements such as minimum mounting temperature are chosen.
The utility model mainly contains following characteristics:
(1) realize the incorgruous radiation of foreign lands through different notch structures and spatial arrangements mode are set, what both can guarantee to communicate by letter normally effectively carries out, and can guarantee is not again needing the electromagenetic wave radiation zone to avoid the loss of electromagnetic energy and mutual interference mutually.The leakage cable of inclined slot can be realized omnidirectional radiation, and the leakage cable of vertical channel only has forward radiation, and therefore the part with inclined slot is arranged on the platform place, and the part of vertical channel is arranged in the tunnel, and the fluting direction all is towards train one side.
(2) for the demand of lower railway wideband wireless communication contentedly, the otch number that is provided with on the inherent outer conductor of this leakage cable one-period is 4, and the service band that leaks cable has been expanded 8 times, can satisfy and be low to moderate public security fire-fighting, high frequency band requirement to the 3G mobile communication.
(3) the leakage coaxial cable frequency coverage of this kind structure can expand to 300MHz--2400MHz.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the paving mode sketch map of the utility model;
Fig. 3 tunnel internal leakage coaxial cable antenna pattern;
The antenna pattern of Fig. 4 platform place leakage coaxial cable.
Embodiment
For example the utility model is done more detailed description below in conjunction with accompanying drawing:
In conjunction with Fig. 1, the underground rail radio communication of the utility model comprises inner conductor with the broadband leakage coaxial cable, external conductor, the insulator between inner conductor and external conductor, the insulating sleeve that external conductor is outer; External conductor is provided with fluting; Described fluting comprises vertical channel 11 and inclined slot 12.The fluting cycle is P; Offer 4 notch 1-4 in the one-period; Each notch spacing is arranged in the tunnel of underground rail for
vertical slot, and the inclined notch inclination angle is arranged on the platform place of underground rail for
.Broadband leakage coaxial cable inner conductor can be aluminum pipe, copper pipe, also can be the good material of other conductivity.Insulator can be the physical blowing polyethylene pipe, or other insulator structure.External conductor can be thin aluminum sheet, and sheet copper also can be the good material of other conductivity.Insulating sleeve can be polyethylene pipe and also can be other insulator structure, can be according to for low cigarette, hang down fire-retardant, antiultraviolet, anticorrosion, characteristic requirements such as minimum mounting temperature are chosen.
Fig. 2 is the system of laying that leaks cable in subway platform and the tunnel; Leaking cable is connected with control centre; The information that the operator sends is fed after amplifying to leaking cable and radiate, and makes train driver, and Platform attendant and wireless terminal holder can both receive the information that control centre sends; Otherwise the RI radio intelligence that is sent by train operator, Platform attendant and holder terminal also can leak cable by feed, is transferred to control centre, the duplex wireless communication of each part in the realization system.
Can be seen that by Fig. 2 a leakage cable runs through platform and tunnel simultaneously, the electromagnetic wave that it radiates must realize simultaneously that the field intensity in platform and tunnel covers, but the needed electromagenetic wave radiation direction in these two zones is different.In the tunnel, to leak cable and only need send signal, and guarantee to go up to the train top to direction of traffic, the ground under train all will have field intensity to cover, and does not then need radiated electromagnetic wave near tunnel wall one side; But at the platform place; Leak cable and will guarantee that not only the signal of train one side covers; Simultaneously also to guarantee to carry out the exchange of information with the user of platform one side; Therefore this part leak cable need be in forward direction and back to irradiation of electromagnetic waves is all arranged, and scope is wide as far as possible to realize that non-blind area covers, and reaches omnidirectional radiation basically.
Realize the incorgruous radiation of foreign lands through different notch structures and spatial arrangements mode are set, what both can guarantee to communicate by letter normally effectively carries out, and can guarantee is not again needing the electromagenetic wave radiation zone to avoid the loss of electromagnetic energy and mutual interference mutually.The leakage cable of inclined slot can be realized omnidirectional radiation; And the leakage cable of vertical channel only has forward radiation, and therefore the leakage cable of design combines the mode of grooving of these two kinds of different structures effectively, and the part that is about to inclined slot is arranged on the platform place; Realization covers to platform and tunnel the time; And the part of vertical channel is arranged in the tunnel, only tunnel one side is carried out field intensity and covers, and the fluting direction all is towards train one side.
The utility model is employed in the method that increases the otch identical with former notch in the one-period and reaches the purpose that the cable service band is leaked in expansion; And the otch number increasing reaches at 3 o'clock; Leak the cable frequency band and obtained 8 times expansion; Satisfied the demand of various communication bands in the underground rail traffic; For example, from public security and fire-fighting (the descending 360-365MHz of up 350-355MHz/), (up 458 ± 3MHz/ descending 468 ± 3MHz) is to civilian radio communication and 3G (Third Generation) Moblie (825-2400MHz) for the railway wireless dispatching.
Fig. 3 and Fig. 4 be novel leakage cable in the tunnel with platform on the radiation direction analogous diagram, operating frequency selects to represent 460MHz, 1800MHz and the 2350MHz of railway wireless dispatching, GSM and TD-SCDMA.Can draw from experimental result:, leak cable and all can satisfy one-sided covering in the tunnel, and realize omnidirectional radiation at the platform place for the electromagnetic wave of different frequency bands and different communication purpose.
Claims (3)
1. a underground rail radio communication is used the broadband leakage coaxial cable, comprises inner conductor, external conductor, the insulator between inner conductor and external conductor, the insulating sleeve that external conductor is outer; External conductor is provided with fluting; It is characterized in that: described fluting comprises vertical channel and inclined slot.
2. underground rail radio communication according to claim 1 is used the broadband leakage coaxial cable; It is characterized in that: the fluting cycle of described fluting is P; Offer 1-4 notch in the one-period, each notch spacing is
3. underground rail radio communication according to claim 1 and 2 is used the broadband leakage coaxial cable, it is characterized in that: the inclined notch inclination angle of inclined slot is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203502228U CN202268463U (en) | 2011-09-19 | 2011-09-19 | Broadband leaky coaxial cable used for underground track wireless communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203502228U CN202268463U (en) | 2011-09-19 | 2011-09-19 | Broadband leaky coaxial cable used for underground track wireless communication |
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| Publication Number | Publication Date |
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| CN202268463U true CN202268463U (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203502228U Expired - Fee Related CN202268463U (en) | 2011-09-19 | 2011-09-19 | Broadband leaky coaxial cable used for underground track wireless communication |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361146A (en) * | 2011-09-19 | 2012-02-22 | 哈尔滨工程大学 | Wideband leaky coaxial cable (LCX) for underground rail wireless communication |
| CN109755722A (en) * | 2019-01-18 | 2019-05-14 | 北京工业大学 | A kind of antenna assembly for shield machine |
| TWI669723B (en) * | 2018-06-12 | 2019-08-21 | 岳林工業有限公司 | Transmission-signal cable and manufacturing method thereof |
| CN110533861A (en) * | 2019-09-06 | 2019-12-03 | 上海理工大学 | The coupled mode leakage coaxial cable of indoor security can be achieved |
| CN115243317A (en) * | 2022-06-30 | 2022-10-25 | 南京华易泰电子科技有限公司 | Wireless network improvement method for guide rail walking automation equipment |
-
2011
- 2011-09-19 CN CN2011203502228U patent/CN202268463U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361146A (en) * | 2011-09-19 | 2012-02-22 | 哈尔滨工程大学 | Wideband leaky coaxial cable (LCX) for underground rail wireless communication |
| TWI669723B (en) * | 2018-06-12 | 2019-08-21 | 岳林工業有限公司 | Transmission-signal cable and manufacturing method thereof |
| CN109755722A (en) * | 2019-01-18 | 2019-05-14 | 北京工业大学 | A kind of antenna assembly for shield machine |
| CN110533861A (en) * | 2019-09-06 | 2019-12-03 | 上海理工大学 | The coupled mode leakage coaxial cable of indoor security can be achieved |
| CN115243317A (en) * | 2022-06-30 | 2022-10-25 | 南京华易泰电子科技有限公司 | Wireless network improvement method for guide rail walking automation equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120606 Termination date: 20140919 |
|
| EXPY | Termination of patent right or utility model |