Short pitch alternation mixed trenching radiation type leak coaxial cable

Abstract

The invention relates to a short pitch mixing tank radial type leaky coaxial cable which is mutually crisscross and has non-uniform spacing. The structure of the cable is formed by enveloping and sheathing an inner conductor of the leaky coaxial cable, an insulated foam material layer, an outer conductor of the leaky coaxial cable and an insulated outer sheath from inside to outside in sequence; the leaky coaxial cable is characterized in that periodical radiation notches are manufactured on the outer conductor of the leaky coaxial cable, the notch has a 'U' shape and an 'L' shape, and every repeated cycle includes two groups; six radiation notches are available, the shapes of the two 'U' shaped radiation notches in each group are the same as each other, but reverse alternately, and the shapes of the 'L' shaped radiation notches between the groups are the same as each other, but reverse alternately; central axes of the radiation notches in each group are mutually staggered at a certain distance. In the same group, the center to center spacing of the 'U' shaped radiation notches in same group is that A is equal to 40mm; the center to center spacing of the 'L' shaped radiation notches between different group is that B is equal to 120mm; the staggered distance among the central axes is that C is equal to 3mm.

Description

technical field [0001] The present invention relates to a kind of staggered, non-uniform spacing short-pitch mixed slot radiating leaky coaxial cable, which realizes the leakage of radio frequency signals by making elongated slots of a certain shape on the outer conductor of the coaxial cable. Different leakage characteristics can be obtained by changing the size, pattern, spacing, repetition period and stagger distance of the groove. The invention can be applied in occasions such as mobile communication indoor distribution system, tunnel and mine communication, and belongs to the field of microwave technology. Background technique [0002] With the rapid development of social economy, new skyscrapers such as luxury hotels, commercial centers, large apartments, etc., and underground structures such as subways, basements, underground garages, etc. have emerged in large numbers, making the use of mobile phones indoors more and more frequent. Users are no longer satisfied with...

AI Technical Summary

Problems solved by technology

[0003] (1) In terms of coverage, due to the complex indoor structure, the shielding and absorption of the building itself, the transmission attenuation of radio waves is relatively large, forming a weak field strength area or even a blind area of ​​the mobile signal, resulting in the basement of the building, a building , The field strength of the second layer is weak, and there are even some blind spots

Due to poor indoor coverage, mobile phones are prone to drop out of the network, resulting in no response to paging

[0004] (2) In terms of quality, radio frequency interference is very likely to exist in the high-rise space of the building, the signal of the serving cell is unstable, and the ping-pong switching effect occurs, the voice quality is difficult to guarantee, and there are interruptions and dropped calls

Conventional radial leaky coaxial cables have a fixed pitch and non-staggered single groove, so the cable resonance phenomenon is very obvious

Images