Leaking coaxial cable

Abstract

The invention relates to a leaking coaxial cable with a grooved outer conductor. The leaking coaxial cable comprises an inner conductor and an insulating layer, an outer conductor, a packing layer and an outer sheath which are wrapped on the inner conductor in turn from inside to outside. The leaking coaxial cable is characterized in that: the outer conductor is uniformly provided with a plurality of triplex splayed groove slit groups, the triplex splayed groove slit groups consist of two columns of groove slits which are mutually symmetrically and obliquely distributed; and the groove slits form a combined structure according to different proportional sizes, different arrangement intervals and different radiation angles of the adjacent groove slits. The coaxial cable has wider communication band and more excellent voltage standing wave ratio and coupling loss value at 900MHz frequency band, has low system loss in a prescribed frequency band, excellent polarization property and about +/-5dB fluctuation of radiation intensity, improves the wireless communication quality, and realizes long-distance wireless blind area coverage. The outer conductor adopts a self-adhesive copper strip so that the consistency of longitudinally-wrapped overlapped lines of the copper strip along the length direction of the cable is ensured, the coupling loss fluctuation of the cable is lower and the polarization property is excellent.

Description

technical field [0001] The invention relates to the field of railway communication, in particular to a special frequency band leaky coaxial cable for a railway GSM-R digital mobile communication system. Background technique [0002] Leaky coaxial cables have the dual functions of information transmission lines and transceiver antennas in wireless communication, especially in areas where discrete antennas cannot provide sufficient field strength, such as between fixed objects such as mountains, hills, subways, tunnels, and buildings. Wireless communication is mainly realized by leaky coaxial cables. Its main application areas include mobile, China Unicom, telecommunications, radio and television, China Netcom, Railcom and other departments. [0003] The structure of a leaky coaxial cable is generally composed of an inner conductor 1, an insulating layer 2, an outer conductor 3 and an outer sheath 5 from the inside to the outside, as shown in Figure 1, the slot shape, size, ...

AI Technical Summary

Problems solved by technology

[0006] The GSM-R digital mobile communication system uses a frequency band above 900MHz. The frequency band of digital transmission communication is wider and the quality of connection is higher. The existing leaky coaxial cable is limited by the s

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