CN203366796U - Low loss coaxial cable - Google Patents
Low loss coaxial cable Download PDFInfo
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- CN203366796U CN203366796U CN 201320333193 CN201320333193U CN203366796U CN 203366796 U CN203366796 U CN 203366796U CN 201320333193 CN201320333193 CN 201320333193 CN 201320333193 U CN201320333193 U CN 201320333193U CN 203366796 U CN203366796 U CN 203366796U
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- insulating barrier
- coaxial cable
- coaxial cables
- loss coaxial
- loss
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Abstract
In order to solve a problem that an existing hollow structural coaxial cable is liable to deform and be damaged so that phase consistency in a signal transmission process is affected. The utility model provides a low loss coaxial cable which comprises, from inside to outside in turn, an internal conductor, an insulating layer, a shielding layer and an external sheath. The insulating layer is internally provided with multiple drop mesopores which extend along the axis direction of the coaxial cable. The section profile of the drop mesopores is composed of an external arc segment, an internal arc segment, and a radial segment which is arranged between the external arc segment and the internal arc segment. The internal arc segment is an arc which recesses towards the direction of the internal conductor. With the application of the scheme, a dielectric constant of the insulating layer can be greatly lowered, insertion loss of the cable can be lowered, transmission rate and reliability of a radio frequency signal are enhanced, and phase consistency of signal transmission is obviously improved simultaneously.
Description
Technical field
The utility model relates to coaxial cable field, especially refers to low-loss coaxial cable.
Background technology
Coaxial cable is mainly used in distribution and the Access Network of rf transmitter unit, building cabling and the cable television network (being called for short CATV) of electronic communication equipment, radio communications system, with the multimedia transmission performance of its broadband, two-forty, is widely used.
Its structure generally comprises and from inside to outside comprises center conductor (solid wire of sub-thread or stranded wire), insulating barrier, screen and oversheath.
Along with the development of the communications industry, more and more higher to the requirement of coaxial cable, such as requiring in signals transmission, require coaxial cable to there are the characteristics such as low-loss, phase stabilization.
As shown in Figure 1, in order to reduce the loss of coaxial cable, have at present the technical scheme that hollow-core construction is set in insulating barrier, its coaxial cable comprises center conductor 1 ', insulating barrier, screen and protective layer (or claiming restrictive coating) from inside to outside successively; This insulating barrier comprises inner sleeve 22 ', outer tube 25 ' and is positioned at 3-5 company's muscle 24 ' between inner sleeve 22 ', outer tube 25 ', be hollow part between outer tube 25 ', inner sleeve 22 ', connect muscle 24 ' described hollow part is divided into to several fan-shaped space parts 23 '.Owing to having introduced several fan-shaped space parts 23 ' in original solid insulating barrier, adopt air to replace the SI semi-insulation material, because the dielectric constant of insulating material generally is greater than 2, and the dielectric constant of air is approximate 1, therefore, adopt this kind of mode, by the relative dielectric constant of its insulating barrier of decrease, reduce the loss of coaxial cable.Although but this kind of structure can effectively reduce its dielectric constant, if coaxial cable applies larger active force outward, during such as bending or distortion, easily cause distortion of the cable even to damage, cause affecting the return loss in its signals transmission.Current this kind of mode is only applicable to the coaxial cable of 75 Ω specifications.
For this problem, as shown in Figure 2, prior art has provided another kind of coaxial cable.It comprises from inside to outside center conductor 1 ', is wrapped in the outer teflon insulation layer 2 ' of center conductor 1 ', is wrapped in the outer woven shield 3 ' of teflon insulation layer 2 ', reaches outermost protective layer 4 '.Simultaneously, be provided with the circular hole 21 ' that vertically is uniformly distributed arrangement in this teflon insulation layer 2 '.This mode is compared the scheme of Fig. 1, and its support strength is improved, cracky not when pressure bending or distortion are born in outside, but the scheme of the relative Fig. 1 of its dielectric constant decreases.
The utility model content
For solving the existing yielding even impaired problem that causes affecting the phase equalization in its signals transmission of coaxial cable with hollow-core construction, the utility model provides a kind of loss coaxial cables.
The loss coaxial cables that the utility model provides, from inside to outside comprise inner wire, insulating barrier, screen and oversheath successively;
In described insulating barrier, be provided with some along the coaxial cable axis direction, extend fall mesoporous, described fall mesoporous cross section profile comprise outer arc segments, interior segmental arc, and the radial section between outer arc segments, interior segmental arc form; Described interior segmental arc is the arc to inner wire direction depression.
In the disclosed loss coaxial cables of the utility model embodiment, in insulating barrier, be provided with some mesoporous along falling of coaxial cable axis direction extension, therefore decrease the relative dielectric constant of insulating barrier, simultaneously, falling mesoporous interior interior segmental arc is the arc to inner wire direction depression, compares existing fan-shaped space part, and its support strength is better, can effectively bear the applied external force of the situations such as bending, distortion, guarantee the temperature difference in transmitting procedure.In sum, adopt the utility model scheme, dielectric constant that can not only the decrease insulating barrier, reduce the insertion loss of cable, promotes transmission rate and the reliability of radiofrequency signal, also obviously improved the phase equalization of signal transmission simultaneously.The utility model is the coaxial cable of applicable 70 Ω specifications not only, also the moving coaxial cable of applicable 50 Ω specifications.
Preferably, described screen wicking.
It is preferably, described that to fall mesoporous number be 5～15.
Preferably, 4, loss coaxial cables as claimed in claim 1, it is characterized in that, described outer arc segments to the distance of insulating barrier outer wheels profile is 0.18-0.25mm, described interior segmental arc to the minimum range of insulating barrier interior line is 0.18-0.25mm, and adjacent described distance of falling between mesoporous is 0.10-0.20mm.
Preferably, the voidage of described insulating barrier is 50-80%.
Preferably, the dielectric constant of described insulating barrier is 1.25-1.6.
Preferably, described inner wire is copper core or silver-plated copper core.
The accompanying drawing explanation
The hollow insulating barrier schematic cross-section of a kind of coaxial cable that Fig. 1 prior art provides;
The coaxial cable schematic cross-section that there is vertical pore structure in a kind of insulating barrier that Fig. 2 prior art provides;
The loss coaxial cables schematic cross-section that Fig. 3 the utility model embodiment provides;
Mesoporous profile schematic diagram falls in Fig. 4 in Fig. 3;
Fig. 5 is insulating barrier schematic cross-section in Fig. 3.
Wherein, 1 ', center conductor; 22 ', inner sleeve; 23 ', fan-shaped space part; 24 ', connect muscle; 25 ', outer tube; 2 ', teflon insulation layer; 3 ', woven shield; 4 ', protective layer; 1, inner wire; 2, insulating barrier; 3, screen; 4, tin coating; 5, oversheath; 21, fall mesoporous; 22, outer wheels profile; 23, interior line; 210, outer arc segments; 211, radial section; 212, interior segmental arc;
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 3, the loss coaxial cables that the utility model provides, from inside to outside comprise inner wire 1, insulating barrier 2, screen 3 and oversheath 5 successively.The coaxial cable of 50 Ω specifications of take is example.
In described insulating barrier 2, be provided with some along the coaxial cable axis direction, extend fall mesoporous 21, as shown in Figure 4, described fall mesoporous 21 cross section profile comprise outer arc segments 210, interior segmental arc 212, and the radial section between outer arc segments 210, interior segmental arc 212 211 form; Described interior segmental arc 212 is the arc to inner wire 1 direction depression.Because it falls interior segmental arc 212 in mesoporous 21, be the arc to inner wire 1 direction depression, its structure has better support strength with respect to the fan-shaped space part in background technology.
As shown in Figure 5, the D outer diameter 1 of insulating barrier 2 is 2.98-3.00mm, preferably, described outer arc segments 210 to the thickness H1 of insulating barrier outer wheels profile 22 be 0.18-0.25mm, this example is 0.20mm preferably, and described interior segmental arc 212 is 0.18-0.25mm to the minimum thickness H2 of insulating barrier interior line 23, and this example is 0.18mm preferably, the adjacent described thickness L1 fallen between mesoporous is 0.10-0.25mm, and this example is 0.20mm preferably.In in this example, the radius of segmental arc is 0.35-0.45mm, and this example is got 0.37mm as concrete enforcement parameter.The arc length 0.70-0.85mm of outer arc segments.
The coaxial cable that this example has just been lifted 50 Ω specifications is example, the general about 3:1 of ratio of its insulating barrier external diameter and inner wire diameter, if the coaxial cable of 75 Ω specifications, the ratio of general insulating barrier external diameter and inner wire diameter is 5:1.This example is not made restriction to falling mesoporous size especially, in the situation that understand the utility model thinking, and concrete which type of size, and without paying creative work.
The material of described insulating barrier 2 can be Kynoar (PTFE) or perfluoroalkoxy resin (PFA) or perfluoroethylene-propylene (FEP) or polyethylene (PE) or ethylene-tetrafluoroethylene copolymer (ETFE).Preferably adopt a kind of in FEP, ETFE or PFA.Further preferably, insulating barrier 2 adopts a kind of in FEP, ETFE or PFA.
Falling mesoporous 21 number can select according to the porosity target of need design and the support strength of insulating barrier, and preferably, described mesoporous 21 the number of falling is 5～15, is preferably 7-9.
Preferably, it is voidage that the ratio that mesoporous 21 volume accounts for whole insulating barrier 2 volumes falls in definition, and the voidage of described insulating barrier 2 is 50-80%, is preferably 60-70%.Owing to adopting above-mentioned mesoporous 21 number and insulating barrier 2 voidages of preferably falling, the dielectric constant of its insulating barrier 2 can be accomplished 1.25-1.6, has reduced dramatically the dielectric constant of insulating barrier 2.
Described screen 3 is a wire sheathing, depending on use occasion, can adopt naked copper, tin-coated copper or silver-plated copper as litzendraht wire, by braiding machine by 80-144 root circle or the flat line is divided into 16 ingots or 24 ingots are woven, form described wire sheathing, the thickness of wire sheathing is generally 0.2-0.3mm.
As a kind of optimal way, described screen 3 wickings, after wicking, tin thickness is about 0.01-0.05mm.
The material of oversheath 5 can be all kinds of fluororesin or PE(polyethylene equally), the PP(polypropylene), the PVC(polyvinyl chloride), LSZH(low-smoke non-halogen flame-retardant cable material) etc.
This routine described coaxial cable manufacture craft is described below: utility model is made extruded stock by insulating material Kynoar (PTFE) or perfluoroalkoxy resin (PFA) or perfluoroethylene-propylene (FEP) or polyethylene (PE) or ethylene-tetrafluoroethylene copolymer (ETFE) etc., then extrusion molding one insulation core wire in extruder by inner wire and insulating material, this insulation core wire comprises inner wire and is wrapped in the outer insulating barrier of inner wire.Then this insulation core wire is placed on braiding machine, adopt braiding one wire sheathing outside insulation core wire such as 16 Lu Huo 24 tunnels, obtain a braiding heart yearn with inner wire, insulating barrier and screen, then by this braiding heart yearn through a molten tin bath that soldering tin is housed, to this braiding heart yearn wicking, obtain wicking braiding heart yearn, then this is woven to heart yearn through extruder, surperficial injection moulding at this braiding heart yearn forms an oversheath, so, obtains this routine described loss coaxial cables.
The loss coaxial cables that the utility model embodiment provides, the fields such as mobile communication and military project space flight that can be applied in are used, such as, TD mobile communication standard and system that China tries hard to recommend, adopt passive phase array multi-antenna technology, provide higher spatial reuse gain by multi-antenna technology, reach the purpose of transmission information faster and more.And the conventional radio frequency coaxial cable adopted at present, its efficiency and phase-unstable may be following broadband LTE-Advanced(enhancement mode Long Term Evolutions) power delivery application institute is unacceptable, and the loss coaxial cables that adopts this example to provide, because dielectric constant is little, phase difference is little, its long transmission distance, the high conformity of phase place, loss is low, the advantages such as transmission rate height.Will bring signal to receive fast, improve the benefits such as mobile call quality, can effectively meet its demand.Again such as, in the phased array radar application of military project space industry, along with the raising of arithmetic speed and the development of basic industries technology, phased-array technique is constantly broken through, and phase equalization is high and stable coaxial-cable feeder, it is one of most important subsystem in radar, the many peculiar function of phased array radar, as electric scanning, multi-beam, wave beam forming, minor level control etc., all by coaxial-cable feeder, realize, new technology is more and more higher for the stability requirement of the amplitude-phase consistency of signal and phase difference.Traditional coaxial cable can not meet the requirement of day by day increasing, and the loss coaxial cables that adopts this example to provide can meet the requirement of its high phase stabilization fully.
In this routine disclosed loss coaxial cables, in insulating barrier, be provided with some mesoporous along falling of coaxial cable axis direction extension, therefore decrease the relative dielectric constant of insulating barrier, simultaneously, falling mesoporous interior interior segmental arc is the arc to inner wire direction depression, compares existing fan-shaped space part, and its support strength is better, can effectively bear the applied external force of the situations such as bending, distortion, guarantee the temperature difference in transmitting procedure.In sum, adopt the utility model scheme, dielectric constant that can not only the decrease insulating barrier, reduce the insertion loss of cable, promotes transmission rate and the reliability of radiofrequency signal, also obviously improved the phase equalization of signal transmission simultaneously.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. a loss coaxial cables, is characterized in that, from inside to outside comprises successively inner wire, insulating barrier, screen and oversheath;
In described insulating barrier, be provided with some along the coaxial cable axis direction, extend fall mesoporously, describedly fall mesoporous cross section profile and comprise outer arc segments, interior segmental arc, and the radial section between outer arc segments, interior segmental arc; Described interior segmental arc is the arc to inner wire direction depression.
2. loss coaxial cables as claimed in claim 1, is characterized in that, described screen wicking.
3. loss coaxial cables as claimed in claim 1, is characterized in that, described to fall mesoporous number be 5～15.
4. loss coaxial cables as claimed in claim 1, it is characterized in that, described outer arc segments to the thickness of insulating barrier outer wheels profile is 0.18-0.25mm, described interior segmental arc to the minimum thickness of insulating barrier interior line is 0.18-0.25mm, and the adjacent described thickness fallen between mesoporous is 0.10-0.20mm.
5. loss coaxial cables as claimed in claim 1, is characterized in that, the voidage of described insulating barrier is 50-80%.
6. loss coaxial cables as claimed in claim 1, is characterized in that, the dielectric constant of described insulating barrier is 1.25-1.6.
7. loss coaxial cables as claimed in claim 1, is characterized in that, described inner wire is copper core or silver-plated copper core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320333193 CN203366796U (en) | 2013-06-09 | 2013-06-09 | Low loss coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320333193 CN203366796U (en) | 2013-06-09 | 2013-06-09 | Low loss coaxial cable |
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| CN203366796U true CN203366796U (en) | 2013-12-25 |
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| CN 201320333193 Expired - Fee Related CN203366796U (en) | 2013-06-09 | 2013-06-09 | Low loss coaxial cable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104123980A (en) * | 2014-08-13 | 2014-10-29 | 安徽德源电缆集团有限公司 | Copper core polyethylene insulating control flexible cable |
| CN104282376A (en) * | 2014-09-26 | 2015-01-14 | 东莞市日新传导科技股份有限公司 | High-anti-interference special cable and manufacturing method thereof |
| CN106972244A (en) * | 2017-02-28 | 2017-07-21 | 惠州硕贝德无线科技股份有限公司 | A kind of trailer-mounted radar array antenna |
| CN109390108A (en) * | 2017-08-04 | 2019-02-26 | 中天射频电缆有限公司 | The forming method of cable and its insulating element |
-
2013
- 2013-06-09 CN CN 201320333193 patent/CN203366796U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104123980A (en) * | 2014-08-13 | 2014-10-29 | 安徽德源电缆集团有限公司 | Copper core polyethylene insulating control flexible cable |
| CN104282376A (en) * | 2014-09-26 | 2015-01-14 | 东莞市日新传导科技股份有限公司 | High-anti-interference special cable and manufacturing method thereof |
| CN106972244A (en) * | 2017-02-28 | 2017-07-21 | 惠州硕贝德无线科技股份有限公司 | A kind of trailer-mounted radar array antenna |
| CN109390108A (en) * | 2017-08-04 | 2019-02-26 | 中天射频电缆有限公司 | The forming method of cable and its insulating element |
| CN109390108B (en) * | 2017-08-04 | 2019-12-24 | 中天射频电缆有限公司 | Cable and method for forming insulating part thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20190609 |
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| CF01 | Termination of patent right due to non-payment of annual fee |