Leakage cable for train ground wireless transmission signal system

A leaky cable and wireless transmission technology, which is applied in the field of rail transit information transmission, can solve the problems of large transmission loss and short transmission distance of leaky cables, and achieve the effects of small transmission loss, light weight and high foaming degree

Active Publication Date: 2015-10-07
JIAOZUO RAILWAY CABLE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a leaky cable for a vehicle-to-ground wireless transmission signal system, which can well solve the problems of short transmission distance and large transmission loss of the existing leaky cable

Method used

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  • Leakage cable for train ground wireless transmission signal system
  • Leakage cable for train ground wireless transmission signal system
  • Leakage cable for train ground wireless transmission signal system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] like image 3 and Figure 4 As shown, a plurality of special-shaped slits 13 are arranged on the outer conductor 12 of the longitudinal clad copper tape along the axial direction of the leaking cable. The special-shaped slits 13 are rectangular, and the middle part of one long side of the rectangle extends to the opposite side to form an isosceles trapezoidal protrusion, etc. The central point of the bottom edge of the waist trapezoidal protrusion coincides with the central point of the long side of the rectangle where the length of the special-shaped slit 13 is w. In this embodiment, the value of w is 20mm Among them, p is the pitch, c is the propagation velocity of electromagnetic waves in free space, f is the center frequency of the leaky cable, is the relative dielectric constant of the insulator of the leaky cable, and v is the velocity coefficient of the leaky cable. In this embodiment, the velocity coefficient v of the leaky cable is 91%, and the value of the ...

Embodiment 2

[0046] like image 3 and Figure 5 As shown, in this embodiment, the length of the long base of the isosceles trapezoidal protrusion is a, and the size of a satisfies 0.2w

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Abstract

The invention provides a leakage cable for a train ground wireless transmission signal system, which comprises an outer sheath, a longitudinal covering copper strip outer conductor, a physical foaming insulator and a spiral corrugated copper tube inner conductor, wherein multiple profiled gaps are arranged on the longitudinal covering copper strip outer conductor along the axial direction; the profiled gaps are rectangular, the middle part of one long edge of the rectangle extends towards the opposite edge to form an isosceles trapezoid protruding part, the central point of the bottom edge of the isosceles trapezoid protruding part coincides with the central point of the long edge of the rectangle of the isosceles trapezoid protruding part, directions of the isosceles trapezoid protruding parts on adjacent two profiled gaps are opposite, and the multiple profiled gaps are arranged axially along the longitudinal covering copper strip outer conductor. The leakage cable for the train ground wireless transmission signal system can meet requirements of signal transmission of multiple frequency bands of the train ground wireless transmission signal system in the urban rail transit field, can be well applied to the train ground wireless transmission signal system, and has the advantages of little transmission loss, little coupling loss, and long transmission distance.

Description

technical field [0001] The invention relates to the field of rail transit information transmission, in particular to a leaky cable for a vehicle-to-ground wireless transmission signal system. Background technique [0002] With the development of urban rail transit technology, the communication-based train control system, that is, the CBTC system has become the mainstream of research and application of urban rail transit signaling systems at home and abroad, and has been widely used in subway construction projects at home and abroad in recent years. [0003] Communication-based train control system (CBTC) adopts advanced communication and computer technology to continuously control and monitor train operation, and can realize two-way information transmission between ground control system and train, which belongs to mobile block system. The CBTC system has the advantages of good system scalability, simple construction and maintenance, and superior transmission methods. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P3/06
Inventor 王胜军王如彬杨永谦尚爱民睿敏吕秀武
Owner JIAOZUO RAILWAY CABLE
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