CN102110498A - Small-diameter coaxial cable - Google Patents
Small-diameter coaxial cable Download PDFInfo
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- CN102110498A CN102110498A CN200910260169XA CN200910260169A CN102110498A CN 102110498 A CN102110498 A CN 102110498A CN 200910260169X A CN200910260169X A CN 200910260169XA CN 200910260169 A CN200910260169 A CN 200910260169A CN 102110498 A CN102110498 A CN 102110498A
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Abstract
The invention provides a small-diameter coaxial cable. The diameter of the cable is smaller, the flexibility and bending resistance of the cable are improved, the shielding characteristic of the cable is excellent and the attenuation of the cable is restrained. The cable is formed by coaxially configuring a central conductor, an insulator, a shielding layer and a sheath, wherein the sectional area of the central conductor is 0.003-0.09mm2; the shielding layer is formed by an inside shielding layer and an outside shielding layer; the inside shielding layer is formed by a plurality of linear first shielding conductors; the first shielding conductors transversely wind the insulator at a winding angle of 73-83 degrees along the first direction; the outside shielding layer is formed by a plurality of linear second shielding conductors; the second shielding conductors transversely wind the inside shielding layer at a winding angle of 73-83 degrees along the second direction opposite to the first direction; the diameters of the first shielding conductors are 0.05-0.12 times the external diameter of the inside shielding layer; and the diameters of the second shielding conductors are 0.05-0.12 times the external diameter of the outside shielding layer.
Description
Technical field
The present invention relates to a kind of small diameter coaxial cable, it is applicable to the distribution in the equipment that uses high-frequency signal to communicate.
Background technology
Have in the electronic equipment of wireless communication unit at mobile phone, the notebook computer corresponding, game machine, vehicle mounted wireless devices such as ETC, GPS etc., need antenna and transmitter/receiver circuit with WLAN.Usually mostly with antenna configurations near the housing of electronic equipment, transmitter/receiver circuit be formed on the circuit substrate such as mainboard and be disposed at the private side of equipment body.Use high-frequency coaxial cable to connect between antenna and transmitter/receiver circuit, this coaxial cable need have thin footpath, low decay and flexibility, anti-bending etc.
Along with the miniaturization of electronic equipment in recent years, the variation of switching function, the wideband high frequencyization of frequency of utilization, be difficult to provide the coaxial cable that can satisfy the demand all the more.Open in the flat 8-102222 communique the spy and to record a kind of coaxial cable, center conductor that it will thin footpath, insulator, the screen and the crust that are made of knitted conductor are configured with coaxial configuration.But if use knitted conductor in screen, then coaxial cable is difficult to further thin footpathization, and in addition, also there are deficiency in the flexibility of cable and anti-bending decline aspect productivity ratio and the cost.
Relative with it, to open in the 2007-188782 communique the spy and to propose a kind of coaxial cable, it forms screen by laterally twining, and the coaxial cable that obtains thin footpath and have the cheapness of flexibility, anti-bending.If form screen with the horizontal coiled conductor of individual layer, then to compare with the coaxial cable that forms screen by knitted conductor, attenuation increases, but by forming insulator by having stable on heating fluoride resin material, can the increase of this attenuation be compensated.In addition, in cable bending or when reversing, might produce the gap between conductor and can't fully shield, compare with the coaxial cable that is formed screen by knitted conductor, shielding character is relatively poor.Form screen if twine 2 layers of horizontal coiled conductor on same direction, then shielding character is improved as with the coaxial cable that is formed screen by knitted conductor roughly the samely, but attenuation is compared increase with the situation of common knitted conductor.
Summary of the invention
The object of the present invention is to provide a kind of thin footpath and have flexibility, anti-bending, and the small diameter coaxial cable that shielding character is good, attenuation is suppressed.
In order to realize purpose, the invention provides a kind of small diameter coaxial cable with coaxial configuration configuration center conductor, insulator, screen and crust.In this cable, the sectional area of center conductor is 0.003mm
2～0.09mm
2Screen is made of inboard screen and outside screen, this inboard screen is made of first shielded conductor of many wire, this first shielded conductor laterally is wrapped on the insulator along first direction for 73 °～83 ° with winding angle, this outside screen is made of the secondary shielding conductor of many wire, this secondary shielding conductor laterally is wrapped on the inboard screen with 73 °～83 ° edge second directions opposite with first direction of winding angle, the diameter of first shielded conductor is 0.05～0.12 times of external diameter of inboard screen, and the diameter of secondary shielding conductor is 0.05～0.12 times of external diameter of outside screen.Here, so-called " winding angle " is meant, the angle that conductor and the section that is orthogonal to the cable major axis form.
In small diameter coaxial cable of the present invention, has the relation of θ 1 〉=θ 2 between the winding angle θ 1 of preferred first shielded conductor and the winding angle θ 2 of secondary shielding conductor.In addition, the preferred characteristics impedance is 50 Ω ± 2 Ω.
The effect of invention
According to small diameter coaxial cable of the present invention, can obtain and the roughly the same shielding character of small diameter coaxial cable that forms screen by knitted conductor.In addition, can make the attenuation of signal compare low with the small diameter coaxial cable that forms screen by knitted conductor.In addition, can obtain flexibility good, be easy to carry out distribution in the equipment and small diameter coaxial cable cheap for manufacturing cost.
Description of drawings
Fig. 1 (A), Fig. 1 (B) are the concept maps of execution mode of explanation small diameter coaxial cable of the present invention, and Fig. 1 (A) is a profile, and Fig. 1 (B) is the oblique view that makes under the state that the internal structure part exposes.
Fig. 2 be that the winding angle to the shielded conductor in the execution mode of small diameter coaxial cable of the present invention describes, make the end view under the state that the internal structure part exposes.
Fig. 3 is the form that the evaluation result of the result that will the execution mode of small diameter coaxial cable of the present invention be estimated and Comparative Examples illustrates side by side.
Fig. 4 is the curve chart of the shielding character of the shielding character of execution mode of expression small diameter coaxial cable of the present invention and Comparative Examples.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.Accompanying drawing not delimit the scope of the invention only for the purpose of description.In the accompanying drawings, for fear of repeat specification, same numeral is represented same section.Dimension scale in the accompanying drawing might not be accurate.
Fig. 1 (A), Fig. 1 (B) are that the explanation embodiments of the present invention are the concept map of small diameter coaxial cable 1, and Fig. 1 (A) is a profile, and Fig. 1 (B) is the oblique view that makes under the state that the internal structure part exposes.Small diameter coaxial cable 1 constitutes, and center conductor 2 insulated bodys 3 surround, and at the screen 6 that the configuration of the outside of insulator 3 is formed by inboard screen 4 and outside screen 5, the outside of this screen 6 is coated by crust 7.Center conductor 2, insulator 3, screen 6 and crust 7 form same shape shaft on the whole length of cable, so that the characteristic impedance homogeneous.
The coaxial cable that the present invention constitutes to use center conductor 2 is as object, and the cross-sectional area of conductor of this center conductor 2 is long-pending to be 0.003mm
2～0.09mm
2About, be equivalent to AWG (American Wire Gauge) #28～#42.As center conductor 2 employed wire rods (bare wire), for example use tin annealed copper wire.Specifically, the bare wire twisted that is 0.05mm with 7 external diameters forms external diameter 0.15mm (0.014mm
2, be equivalent to AWG#36) center conductor, perhaps the bare wire twisted that is 0.102mm with 7 external diameters forms external diameter 0.31mm (0.057mm
2, be equivalent to AWG#29) center conductor.
Fig. 2 be that the winding angle to the shielded conductor in the small diameter coaxial cable 1 describes, make the end view under the state that the internal structure part exposes.First shielded conductor of screen 6 twines with winding angle θ 1 (hereinafter referred to as winding angle), and the secondary shielding conductor twines with winding angle θ 2.Scatter man-hour in order to prevent to add at the end that connects to connector, winding angle θ 1, the θ 2 of the shielded conductor of usually preferred small diameter coaxial cable drops in 70 °～85 ° the scope.In the present invention, more preferably winding angle θ 1, θ 2 drop in 73 °～83 °.
Because winding angle θ 1, the θ 2 of shielded conductor are more little, when bend, cable just gets over meeting so that the winding of each shielded conductor becomes big mode at interval moves, so can anti-ly bend.Here, under the situation of screen 6 with 2 layers of winding, when cable bent, the power that applies of first shielded conductor of screen was big to the inside for the force rate that applies of the secondary shielding conductor of screen laterally.Thus, the winding angle θ 2 of preferred secondary shielding conductor is slightly less than the winding angle θ 1 of first shielded conductor.That is,, make the secondary shielding conductor identical at the tolerance of bending, thereby can guarantee Mechanical Reliability with first shielded conductor by forming θ 1 〉=θ 2.
In addition, when cable reverses,, promptly be the direction that the winding of secondary shielding conductor is tightened on the contrary under the situation of the lax direction of the winding that makes first shielded conductor.But, as mentioned above,, make the conductor length of secondary shielding conductor elongated by forming θ 1 〉=θ 2, the lax and protuberance laterally with respect to first shielded conductor, the amount of tightening of secondary shielding conductor is less.Its result, when cable reversed, the frictional force between first shielded conductor and the secondary shielding conductor diminished, and improved the tolerance at broken string, thereby can improve Mechanical Reliability.
First shielded conductor and secondary shielding conductor for example can use the tin annealed copper wire identical with center conductor 2.At the center conductor external diameter is in the coaxial cable of 0.15mm, inboard screen 4 and outside screen 5 are all formed, and are that the shielded conductor tens of (for example about 60) of 0.05mm forms shapes arranged side by side and twines with pitch (pitch) 7mm (θ 1=78 °, θ 2=75 °) with diameter.In the case, the diameter of first shielded conductor is (0.05/0.53)=0.094 times with respect to the external diameter of inboard screen 4 (hereinafter referred to as the shielding coil diameter).In addition, the diameter of secondary shielding conductor is (0.05/0.63)=0.079 times with respect to the shielding coil diameter of outside screen 5.
In addition, be in the coaxial cable of 0.31mm at the center conductor external diameter, can make the first shielded conductor diameter is 0.05mm, the secondary shielding conductor diameter is 0.064mm, twines with pitch 12mm (θ 1=76 °, θ 2=73 °) and forms screen.In the case, the shielded conductor diameter is (0.05/1.0)=0.05 times in inboard screen 4 with respect to the shielding coil diameter, is (0.064/1.128)=0.057 times in outside screen 5.
In addition, long-pending at the cross-sectional area of conductor of center conductor 2 is 0.03mm
2Under the situation of (being equivalent to AWG#42), the external diameter that is used to obtain the insulator 3 of characteristic impedance 50 Ω is 0.2mm.In the case, the preferred first shielded conductor diameter is less than or equal to 0.03mm, and the secondary shielding conductor diameter is less than or equal to 0.04mm.In the case, the shielded conductor diameter is with respect to the shielding coil diameter, in inboard screen 4 for being less than or equal to (0.03/0.26)=0.115 times, in outside screen 5 for being less than or equal to (0.04/0.34)=0.118 times.
As mentioned above, as the coaxial cable after the thin footpathization, the shielded conductor diameter forms 0.05～0.12 times of shielding coil diameter.For 0.05 times the thin footpath of shielded conductor diameter less than the shielding coil diameter, be difficult to guarantee shielding character, the resistance value of shielded conductor increases, and has shortcoming aspect attenuation characteristic.In addition, surpass the particle size that shields 0.12 times of coil diameter, cut off owing to bending repeatedly easily, aspect Mechanical Reliability, have shortcoming for the shielded conductor diameter.
At the center conductor external diameter is in the coaxial cable of 0.15mm, and crust 7 for example can use PFA, and forming thickness is 0.09mm, and the crust external diameter is 0.81mm.In addition, be in the coaxial cable of 0.31mm at the center conductor external diameter, it is 0.12mm that crust 7 can form thickness, the crust external diameter is 1.35mm.
Fig. 3 is the form that the evaluation result with the evaluation result of small diameter coaxial cable 1 and existing standard items (braid shielded) and Comparative Examples (laterally twining 1 layer of shielding, 2 layers of shielding of equidirectional) illustrates side by side.For estimating product, center conductor all uses 7 external diameters of twisted to be 0.31mm (0.057mm as the external diameter that the tin annealed copper wire of 0.102mm forms
2, be equivalent to AWG#29) twisted wire.The external diameter of insulator 3 is 0.9mm, forms by fluoridizing PFA (being common fluorine resin in the braiding standard items).Screen 6 uses tin annealed copper wire to form.Crust 7 is common PFA, is that the mode extrusion molding of 1.35mm forms with the external diameter.For screen, be that shielded conductor by diameter 0.05mm forms with 1 layer in the existing standard product (braiding), be that shielded conductor by diameter 0.1mm forms with 1 layer in the Comparative Examples (1 layer laterally twine), being to be formed by the inboard shielded conductor of diameter 0.05mm and the outside shielded conductor of diameter 0.064mm in the Comparative Examples (2 layers of equidirectional laterally twine), is to be formed by the inboard shielded conductor of diameter 0.05mm and the outside shielded conductor of diameter 0.064mm among the present invention's (2 layers of different directions laterally twine).
The result who estimates is that for characteristic impedance, any one estimates product can guarantee 50 Ω ± 2.Fig. 4 is the curve chart that the shielding character of small diameter coaxial cable 1 is represented with the shielding character of existing standard product (braiding) and Comparative Examples (1 layer laterally twines).The shielding character (amount of drain voltage) of Comparative Examples (1 layer laterally twines) is compared relatively poor with the shielding character of existing standard product.But small diameter coaxial cable 1 can be guaranteed the shielding character with existing standard product same degree.(shielding character of Comparative Examples (2 layers of equidirectional laterally twine) is also roughly the same with the shielding character of existing standard product.) for cost, Comparative Examples (1 layer laterally twines) is the most cheap, existing standard product (braiding) are the most expensive, and Comparative Examples (2 layers of equidirectional laterally twine) and product of the present invention are between them.
Attenuation for signal, Comparative Examples (1 layer laterally twines) is compared minimizing with existing standard product (braiding), show excellent result, in the Comparative Examples of having improved shielding character (2 layers of equidirectional laterally twine), increase in frequency gets higher (6.0GHz) back loss.But, under situation of the present invention, to compare with existing standard product (braiding), the attenuation of signal reduces about 10%, can suppress for roughly the same with Comparative Examples (1 layer laterally twines).The decay of this high-frequency signal is subjected to the contact resistance between the shielded conductor and the influence of skin effect.Thus, can think that if as described herein making the winding angle θ 1 of 2 layers screen, θ 2 is 73 °～83 °, winding direction is opposite, then first shielded conductor contacts with less contact resistance with the secondary shielding conductor, and is in the less state of influence of skin effect.
According to coaxial cable 1, shielding character is remained compare with the coaxial cable that adopts braid shielded roughly the same, and, the attenuation of signal can be reduced about 10%.In addition, its cost is lower than the coaxial cable of braid shielded structure, and flexibility is good owing to laterally twine, and is easy to carry out the interior distribution of equipment, can carry out thin footpathization.
Claims (3)
1. small diameter coaxial cable, it constitutes with coaxial configuration configuration center conductor, insulator, screen and crust,
Wherein,
The sectional area of described center conductor is 0.003mm
2～0.09mm
2,
Described screen is made of inboard screen and outside screen, this inboard screen is made of first shielded conductor of many wire, this first shielded conductor laterally is wrapped on the described insulator along first direction with 73 °～83 ° of winding angles, this outside screen is made of the secondary shielding conductor of many wire, this secondary shielding conductor laterally is wrapped on the described inboard screen with 73 °～83 ° edge second directions opposite with described first direction of winding angle
The diameter of described first shielded conductor is 0.05～0.12 times of external diameter of described inboard screen, and the diameter of described secondary shielding conductor is 0.05～0.12 times of external diameter of described outside screen.
2. small diameter coaxial cable as claimed in claim 1, wherein,
The relation that has θ 1 〉=θ 2 between the winding angle θ 1 of described first shielded conductor and the winding angle θ 2 of described secondary shielding conductor.
3. small diameter coaxial cable as claimed in claim 1 or 2, wherein,
Characteristic impedance is 50 Ω ± 2 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910260169XA CN102110498B (en) | 2009-12-24 | 2009-12-24 | Small-diameter coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910260169XA CN102110498B (en) | 2009-12-24 | 2009-12-24 | Small-diameter coaxial cable |
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| Publication Number | Publication Date |
|---|---|
| CN102110498A true CN102110498A (en) | 2011-06-29 |
| CN102110498B CN102110498B (en) | 2012-11-28 |
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| CN200910260169XA Active CN102110498B (en) | 2009-12-24 | 2009-12-24 | Small-diameter coaxial cable |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102339662A (en) * | 2010-07-16 | 2012-02-01 | 住友电气工业株式会社 | Twisted-pair cable and method for manufacturing same |
| CN102881366A (en) * | 2012-09-26 | 2013-01-16 | 四国电线（东莞）有限公司 | High-frequency shield wire |
| CN103854756A (en) * | 2012-11-30 | 2014-06-11 | 倪鹏程 | Integrated cable |
| CN103871688A (en) * | 2014-03-13 | 2014-06-18 | 苏州科茂电子材料科技有限公司 | Preparing method of high-performance ultra-fine coaxial cable |
| CN104205251A (en) * | 2012-03-05 | 2014-12-10 | 胡贝尔舒纳公司 | Method for producing a stranded inner conductor for coaxial cable, and coaxial cable |
| CN105431913A (en) * | 2013-07-31 | 2016-03-23 | 株式会社润工社 | Coaxial cable |
| CN110268483A (en) * | 2017-02-10 | 2019-09-20 | 株式会社润工社 | Coaxial cable |
| CN113851257A (en) * | 2020-06-26 | 2021-12-28 | 莫列斯有限公司 | Electric wire and composite cable |
| CN115632221A (en) * | 2022-12-07 | 2023-01-20 | 成都沃特塞恩电子技术有限公司 | Twistable coaxial cable and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4221968B2 (en) * | 2002-07-31 | 2009-02-12 | 住友電気工業株式会社 | 2-core parallel shielded cable, wiring components and information equipment |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102339662B (en) * | 2010-07-16 | 2013-12-25 | 住友电气工业株式会社 | Twisted-pair cable and method for manufacturing same |
| CN102339662A (en) * | 2010-07-16 | 2012-02-01 | 住友电气工业株式会社 | Twisted-pair cable and method for manufacturing same |
| CN104205251B (en) * | 2012-03-05 | 2018-01-02 | 胡贝尔舒纳公司 | Produce method and coaxial cable with twisted inner wire for coaxial cable |
| US10056172B2 (en) | 2012-03-05 | 2018-08-21 | Huber+Suhner Ag | Method for producing a coaxial cable |
| CN104205251A (en) * | 2012-03-05 | 2014-12-10 | 胡贝尔舒纳公司 | Method for producing a stranded inner conductor for coaxial cable, and coaxial cable |
| CN102881366A (en) * | 2012-09-26 | 2013-01-16 | 四国电线（东莞）有限公司 | High-frequency shield wire |
| CN103854756A (en) * | 2012-11-30 | 2014-06-11 | 倪鹏程 | Integrated cable |
| CN105431913A (en) * | 2013-07-31 | 2016-03-23 | 株式会社润工社 | Coaxial cable |
| CN103871688A (en) * | 2014-03-13 | 2014-06-18 | 苏州科茂电子材料科技有限公司 | Preparing method of high-performance ultra-fine coaxial cable |
| CN110268483A (en) * | 2017-02-10 | 2019-09-20 | 株式会社润工社 | Coaxial cable |
| EP3582236A4 (en) * | 2017-02-10 | 2020-11-18 | Junkosha Inc. | Coaxial cable |
| CN110268483B (en) * | 2017-02-10 | 2021-03-30 | 株式会社润工社 | Coaxial cable |
| CN113851257A (en) * | 2020-06-26 | 2021-12-28 | 莫列斯有限公司 | Electric wire and composite cable |
| CN115632221A (en) * | 2022-12-07 | 2023-01-20 | 成都沃特塞恩电子技术有限公司 | Twistable coaxial cable and electronic equipment |
| CN115632221B (en) * | 2022-12-07 | 2023-04-07 | 成都沃特塞恩电子技术有限公司 | Twistable coaxial cable and electronic equipment |
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| CN102110498B (en) | 2012-11-28 |
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