CN202019044U

CN202019044U - Hole-slot type variable-coupling self-equalized power leakage coaxial cable

Info

Publication number: CN202019044U
Application number: CN201120155965XU
Authority: CN
Inventors: 冯嵩
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-13
Filing date: 2011-05-13
Publication date: 2011-10-26
Anticipated expiration: 2021-05-13

Abstract

The utility model relates to a hole-slot type variable-coupling self-equalized power leakage coaxial cable, which comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath, wherein the inner conductor is positioned in the center of the leakage coaxial cable; the insulating layer is coated outside the inner conductor; the outer conductor is arranged outside the insulating layer; and the outer sheath is coated outside the outer conductor. The hole-slot type variable-coupling self-equalized power leakage coaxial cable is characterized in that: the outer conductor is provided with a plurality of leakage hole slots; the leakage hole slots are sequentially distributed along the axis of the coaxial cable from an energy input end of the coaxial cable to an energy output end of the coaxial cable; distances between two adjacent leakage hole slots on the outer conductor are sequentially decreased from the energy input end of the coaxial cable to the energy output end of the coaxial cable; and the areas of the leakage hole slots on the outer conductor are sequentially increased from the energy input end of the coaxial cable to the energy output end of the coaxial cable. The hole-slot type variable-coupling self-equalized power leakage coaxial cable has the advantages that: structure is simple; electromagnetic wave radiation performance is excellent; and energy waste can be avoided.

Description

A kind of hole slot formula becomes coupling from the equal power leaky coaxial cable

Technical field

The utility model belongs to technical field of signal transmission cables, particularly relates to a kind of hole slot formula and becomes coupling from the equal power leaky coaxial cable.

Background technology

Leaky coaxial cable is a kind of opening transmission line that can be used for the signal transmission, and it can be gone out controlled electromagnetic wave energy path radiation along the line and accept into by the control of external conductor openings, improves the coverage of radio wave thus, eliminates the busy point of transmission.Leaky coaxial cable is mainly used in the environment that general communication antenna is difficult to play a role, as zones such as mountain area, tunnel, tunnel, subterranean railway, hypogees.

Leaky coaxial cable generally comprises inner wire, insulating barrier, outer conductor and oversheath four parts from inside to outside, has the hole slot of sewing on outer conductor, sew hole slot and be generally the rectangle hole slot, and a plurality of identical rectangle hole slot evenly distributes along the axis of coaxial cable.The version of coaxial cable outer conductor has determined the performance of sewing of cable.Wherein sew hole slot structure and distribution and be one of key factor of decision leaky coaxial cable performance index, directly determine the coupling coefficient (the electromagnetic wave signal power that from leaky cable, gives off with in leaky cable the ratio of the electromagnetic wave signal power of transmission) along its length of leaky coaxial cable.

Above-mentioned leaky coaxial cable of the prior art, the hole slot of sewing in its structure on the outer conductor is generally a plurality of rectangle hole slots and evenly distributes along the axis of coaxial cable, thereby make that the coupling coefficient of leaky coaxial cable is a fixed value, there is following problem in use in such leaky cable: because the power output of the signal source transmitter of system is a certain fixed value at any one time, this means that from the electromagnetic wave signal power of leaky cable one end input be a fixed value, so, along with along loss on the cable length direction and signal leakage radiation loss on the way, at leaky cable end away from signal source, signal power in the cable must be lower than the signal power in the cable input, therefore, for an invariable leaky cable of coupling coefficient, along on the whole cable axis direction, continuous variation takes place in the radiated electromagnetic wave signal power value in extraneous space, thereby cause such as subway, everywhere electromagnetic wave signal power level unequal in the long and narrow spaces such as tunnel, but the receiving sensitivity that receives the terminal equipment of electromagnetic wave signal is but fixed.Cross when low when outer signals intensity, will influence the reception of signal.In view of this, in actual applications, unlikely low excessively in order to guarantee at the electromagnetic wave signal power of leaky cable end, just must can only increase the signal power of cable input, thereby make the signal power of cable end piece peripheral space meet the requirements of intensity, but caused near the signal power value in the space of cable input too high simultaneously inevitably, caused the waste of energy consumption.

Summary of the invention

The utility model provides a kind of simple in structure, electromagenetic wave radiation excellent performance and can avoid the hole slot formula of energy waste to become coupling from the equal power leaky cable for solving the technical problem that exists in the known technology.。

The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: a kind of hole slot formula becomes coupling from the equal power leaky coaxial cable, comprises the inner wire that is positioned at the leaky coaxial cable center; Be coated on the outer insulating barrier of inner wire; Be arranged on the outer outer conductor of insulating barrier; Be coated on the outer oversheath of described outer conductor, it is characterized in that: described outer conductor has a plurality of hole slots of sewing, describedly sew hole slot the energy output to coaxial cable is arranged in order distribution along the axis of coaxial cable from the energy input of coaxial cable, adjacent sew distance between the hole slot energy output to coaxial cable reduces successively from the energy input of coaxial cable for two on the described outer conductor, the energy output to coaxial cable increases the area of sewing hole slot on the described outer conductor successively from the energy input of coaxial cable.

The utility model can also adopt following technical scheme:

The described hole slot of sewing is rectangle or cydariform.

Advantage and the good effect that the utlity model has are: because the utility model adopts as above technical scheme, i.e. a plurality of hole slots of sewing of tool on the outer conductor of leaky coaxial cable, the energy output to coaxial cable is arranged in order distribution along the axis of coaxial cable from the energy input of coaxial cable to sew hole slot, two adjacent sews distance between the hole slot energy output to coaxial cable reduces successively from the energy input of coaxial cable, and the energy output to coaxial cable increases the area of sewing hole slot successively from the energy input of coaxial cable.The structure of sewing hole slot of above-mentioned coaxial cable and the redesign of distribution, make that the coupling coefficient of leaky coaxial cable is continuous to the energy output of coaxial cable from the energy input of coaxial cable, progressive increase, thereby reach following effect: at the signal input part of leaky cable, though the signal power strength value maximum in the cable, but coupling coefficient minimum because of this position of cable, so the small part in the big signal power of intensity level is able to leakage radiation and goes out, unlikely too high with this radiation signal power of controlling peripheral space, and remain on the intensity level of requirement, get simultaneously so that more signal energy is transmitted to its end along cable axis, make the back segment and the more signal energy of terminal acquisition of cable.Though still have loss and signal leakage radiation loss on the way in the cable, but increase gradually because of cable rear end and terminal coupling coefficient, cable rear end and end still can have enough signal energy leakage radiations to go out, thereby make cable rear end and terminal peripheral space signal power be unlikely to low, to meet the requirements of the signal power value.The utility model leaky coaxial cable radiated electromagnetic wave power equalization is stable, successfully solved leaky cable under the present known technology at its input radiation signal power too by force causing energy dissipation, and too weak to influence the defective of receptivity at the far-end radiation signal.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1, inner wire; 2, insulating barrier; 3, outer conductor; 4, sew hole slot; 5, oversheath.

Embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:

See also Fig. 1, a kind of hole slot formula becomes coupling from the equal power leaky cable, and cable comprises from the inside to the outside successively: the inner wire 1 that is positioned at the leaky coaxial cable center; Extrude the insulating barrier 2 on inner wire, this insulating barrier 2 is formed by for example physical blowing polyethylene; Be coated on the outer conductor 3 outside the insulating barrier 2, this outer conductor 3 which is provided with electromagnetic wave signal and sews hole slot 4 for containing the band of sheet metal; Extrude the oversheath 5 outside outer conductor 3.Each part mentioned above all forms with the material of tasting.

In order to reduce the transmission attenuation of cable when transmitting electromagnetic wave signal, the structure of sewing hole slot 4 of this leaky coaxial cable is: outer conductor has a plurality of hole slots 4 of sewing, the energy output to coaxial cable is arranged in order distribution along the axis of coaxial cable from the energy input of coaxial cable to sew hole slot 4, adjacent sew distance between the hole slot 4 the energy output to coaxial cable reduces successively from the energy input of coaxial cable for two on the outer conductor 3, the energy output to coaxial cable increases the area of sewing hole slot 4 on the outer conductor 3 successively from the energy input of coaxial cable.

In the production process of leaky coaxial cable, operating personnel require (being the parameters such as gradient data of shape, area, spacing and the gradual change of hole slot) that the hole slot 4 of sewing on the cable outer conductor is processed according to concrete process data.This engineering can be machined by manual operation equipment interruption, also can finish by numerically controlled processing equipment is disposable.

Claims

1. a hole slot formula becomes coupling from the equal power leaky coaxial cable, comprises the inner wire that is positioned at the leaky coaxial cable center; Be coated on the outer insulating barrier of inner wire; Be arranged on the outer outer conductor of insulating barrier; Be coated on the outer oversheath of described outer conductor, it is characterized in that: described outer conductor has a plurality of hole slots of sewing, describedly sew hole slot the energy output to coaxial cable is arranged in order distribution along the axis of coaxial cable from the energy input of coaxial cable, adjacent sew distance between the hole slot energy output to coaxial cable reduces successively from the energy input of coaxial cable for two on the described outer conductor, the energy output to coaxial cable increases the area of sewing hole slot on the described outer conductor successively from the energy input of coaxial cable.