CN203690464U

CN203690464U - Wide frequency leaky coaxial cable without resonance point in application range

Info

Publication number: CN203690464U
Application number: CN201320763558.6U
Authority: CN
Inventors: 王革; 尚爱民; 王胜军; 王如彬; 张永峰; 睿敏; 许�鹏
Original assignee: Jiaozuo Railway Cable Co Ltd
Current assignee: Jiaozuo Railway Cable Co Ltd
Priority date: 2013-11-28
Filing date: 2013-11-28
Publication date: 2014-07-02
Anticipated expiration: 2023-11-28

Abstract

The utility model discloses a wide frequency leaky coaxial cable without resonance points in application range. The cable comprises an inner conductor, and the outer layer of the inner conductor is sleeved with an insulating layer, an outer conductor, a taped covering, and an outer sheath from inside out in sequence. The outer side of the outer sheath is provided with an identifying line. The outer conductor is provided with a plurality of groups of leakage grooves along an axial direction. Each group of leakage grooves comprise two groove holes. The two groove holes of each group of leakage grooves are arranged that openings are in a same direction or in opposite directions. The groove hole comprises two side arms and a bottom arm. Through arranging the leakage grooves on the outer conductor of the leaky coaxial cable, electromagnetic waves are radiated outward, and through adjusting the side arms of the groove holes and arm width of the bottom arms, included angles of the side arms, length of the side arms, and pitch values of the two groove holes, bandwidth of leakage groove radiation is in a range of 50 MHz to 2700 MHz, and in the frequency range, no resonance point exists, so that the cable can ensure China mobile, Unicom, Telecom, and TD-LTE wireless communication systems transmit smoothly.

Description

A kind of broadband, the interior leaky coaxial cable without resonance point of the scope of application

Technical field

The utility model relates to communication cable technical field, relates in particular to the leaky coaxial cable without resonance point in a kind of broadband, the scope of application.

Background technology

Along with the construction at full speed of high ferro and urban track traffic, country communicates by letter and more and more standardizes the public network of high-speed railway and urban track traffic, and requirement movement, UNICOM and the large operator of telecommunications three must be by the signal fused of different frequency in POI.Simultaneously require product must meet following TD-LTE communication frequency when mobile operator design system.This just requires cable not only can use in wide in range frequency range, can also in the means of transportation of high-speed mobile, use stably.

The structure of existing leaky coaxial cable is made up of from inside to outside successively inner wire, insulator, outer conductor and oversheath.The otch arranging by outer conductor surface is according to the outside radiated electromagnetic wave of some cycles, regularity, each otch is equivalent to a radiation source, the electromagnetic wave giving off is received by wireless receiver around, be applicable to, in the environment such as the unsettled tunnel of radio signal propagation, tunnel, subterranean railway, hypogee, have the dual-use function of signal transmssion line and dual-mode antenna concurrently.But the frequency of utilization scope of existing leaky coaxial cable is 800MHz～2400MHz, frequency band is narrower, there is the shortcoming that radiation fluctuation is larger in cable simultaneously, wideband mobile communication system is not suitable for application, cannot make movement, UNICOM and the large operator of telecommunications three and TD-LTE communication system merge in a POI.

Utility model content

The purpose of this utility model is to provide the leaky coaxial cable without resonance point in a kind of broadband, the scope of application, can widen leakage coaxial cable and use frequency range, frequency of utilization scope reaches 50 MHz ~ 2700MHz, and can within the scope of frequency of utilization, there is the characteristic without resonance point, ensure that movement, UNICOM and telecommunications and TD-LTE wireless telecommunication system signal merge transmission.

The technical solution adopted in the utility model is:

A kind of broadband, the interior leaky coaxial cable without resonance point of the scope of application, comprise inner wire, inner wire skin is arranged with insulating barrier from inside to outside successively, outer conductor, lapping layer and oversheath, oversheath outside is provided with tag line, described outer conductor in axial direction offers many groups and sews groove, sew groove for every group and comprise two slotted eyes, each slotted eye is " U " shape or inverted " U " shape, every group of two slotted eye of sewing groove are arranged by opening or in the same way by opening reversed arrangement, slotted eye comprises arm at the bottom of two side arms and, article two, the angular range of side arm is 150 °-175 °, the arm wide region of side arm and end arm is 0.5mm-3.0mm, side arm length range is 10mm-50mm, the center distance of two slotted eyes is 20mm-210mm.

The outer surface of outer conductor adopts embossing structure, is wavy along outer conductor axial direction.

Described tag line, inner wire axle center, sew groove on same straight line, and tag line and sew groove and be positioned at both sides, inner wire axle center.

The utility model by offering and sew groove on the outer conductor of leakage coaxial cable, outwards radiated electromagnetic wave, by adjusting the side arm of slotted eye and the arm of end arm is wide, the angle number of degrees of side arm, the length of side arm, the pitch size of two slotted eyes, make the frequency range of sewing groove radiation in 50 MHz ~ 2700MHz scope, and in this frequency range almost without resonance point, ensure that mobile, UNICOM and telecommunications and TD-LTE wireless communication system can transmit swimmingly.

Brief description of the drawings

Fig. 1 is cross section structure schematic diagram of the present utility model;

Fig. 2 is outer conductor outer surface embossing structural representation of the present utility model;

Fig. 3 is the groove notch arrangement architecture schematic diagram in the same way of sewing of the present utility model;

Fig. 4 is the groove notch reversed arrangement structural representation of sewing of the present utility model;

Fig. 5 is leaky coaxial cable coupling loss resolution chart of the present utility model;

Fig. 6 is the leaky coaxial cable 2m place coupling loss resolution chart of the utility model test.

Embodiment

As shown in Figure 1 and Figure 2, the utility model comprises inner wire 1, inner wire 1 skin is arranged with insulating barrier 2, outer conductor 3, lapping layer 4 and oversheath 5 from inside to outside successively, the outer surface of outer conductor 3 adopts embossing structure 8, be wavy along outer conductor 3 axial directions, embossing structure 8 can ensure that leaky coaxial cable has good bending property; Outer conductor 3 in axial direction offers many groups and sews groove 6, sew groove for every group and comprise two slotted eyes, each slotted eye is " U " shape or inverted " U " shape, every group of two slotted eye of sewing groove are arranged (as shown in Figure 3) by opening or in the same way by opening reversed arrangement (as shown in Figure 4), slotted eye comprises arm 10 at the bottom of two side arms 9 and, article two, the angle α scope of side arm 9 is 150 °-175 °, the wide L3 scope of arm of side arm 9 and end arm 10 is 0.5mm-3.0mm, length L 2 scopes of side arm 9 are 10mm-50mm, and the center distance L1 of two slotted eyes is 20mm-210mm.Oversheath 5 outsides are provided with tag line 7, tag line 7, inner wire axle center, sew groove 6 on same straight line, and tag line 7 with sew groove 6 and be positioned at both sides, inner wire axle center, tag line 7 with sew groove and be 180 °, can make workmen judge rapidly and sew groove direction, convenient construction.

That on the outer conductor of leaky coaxial cable described in the utility model, offers in axial direction sews groove for " U " type structure or inverted " U " shape structure, because ripple loss in the process of space transmission is larger, so by changing direction and the combining structure of slotted eye, adjust physical dimension and the slotted eye center distance of the shape of slotted eye, suppress the loss of ripple at slotted eye place, be that electromagnetic transmission distance is farther, frequency band is wider.So the utility model leaky coaxial cable is by changing direction, the combination of slotted eye, adjust physical dimension and the slotted eye center distance of grooved, to realize in the frequency range of the non-constant width of 50MHz ~ 2700MHz, will move, UNICOM, the large operator of telecommunications three and the fusion of TD-LTE wireless telecommunication system signal transmit.

Shape and the physical dimension of sewing groove 6 can change according to the difference that uses frequency range and wireless blind area coverage distance, in the utility model, the angle α scope of two side arms 9 is 150 °-175 °, the wide L3 scope of arm of side arm 9 and end arm 10 is 0.5mm-3.0mm, length L 2 scopes of side arm 9 are 10mm-50mm, and the center distance L1 of two slotted eyes is 20mm-210mm.Due to the difference of actual conditions use frequency range and wireless blind area coverage distance, therefore, need measure scene in advance, the artificial judgment groove parameters value of sewing of the present utility model, makes it the frequency range scope that reaches default afterwards.

Through overtesting, the utility model can make the frequency range of sewing groove radiation in 50 MHz ~ 2700MHz scope, and there is no resonance point in the scope of application of this frequency range; And coupling loss fluctuation is very little, is less than 2dB, and the error rate in high-speed railway environment (BERs) is lower than 10 ^-8, less coupling loss fluctuation and the lower error rate are very favourable to the transmission of mobile communication system signal.

As shown in Figure 5 and Figure 6, leaky coaxial cable product described in the utility model has less coupling loss value in use frequency range.When wherein abscissa representative is tested, horizontal range (0-50m) between the center of reception antenna and test cable power input, ordinate represents the coupling loss value of corresponding reception antenna center test point, shown in Fig. 6, be 60.11dB in the coupling loss of measuring under 95% probability apart from 2 meters of of cable.

Leaky coaxial cable product described in the utility model, there is wider service band, frequency band range is 50MHz ~ 2700MHz, and there is no resonance point within the scope of general service band, general service band is discontinuity, not successional, for example 108 MHz left and right, 280 MHz left and right, 350 MHz left and right, 420 MHz left and right, 500 MHz left and right, 700 MHz left and right etc.Leaky coaxial cable Transmission attenuation test value is even smooth change in the frequency range of 50MHz ~ 2700MHz, meets the user demand of movement, UNICOM and telecommunications and TD-LTE wireless communication system.

Claims

1. a broadband, the interior leaky coaxial cable without resonance point of the scope of application, comprise inner wire, inner wire skin is arranged with insulating barrier from inside to outside successively, outer conductor, lapping layer and oversheath, oversheath outside is provided with tag line, it is characterized in that: described outer conductor in axial direction offers many groups and sews groove, sew groove for every group and comprise two slotted eyes, each slotted eye is " U " shape or inverted " U " shape, every group of two slotted eye of sewing groove are arranged by opening or in the same way by opening reversed arrangement, slotted eye comprises arm at the bottom of two side arms and, article two, the angular range of side arm is 150 °-175 °, the arm wide region of side arm and end arm is 0.5mm-3.0mm, side arm length range is 10mm-50mm, the center distance of two slotted eyes is 20mm-210mm.

2. broadband according to claim 1, the interior leaky coaxial cable without resonance point of the scope of application, is characterized in that: the outer surface of outer conductor adopts embossing structure, is wavy along outer conductor axial direction.

In broadband according to claim 2, the scope of application without the leaky coaxial cable of resonance point, it is characterized in that: described tag line, inner wire axle center, sew groove on same straight line, and tag line and sew groove and be positioned at both sides, inner wire axle center.