CN204270723U - Shielded type cable - Google Patents

Abstract

The utility model relates in general to a kind of shielded type cable.This shielded type cable (100) forms screening strap cable.Specifically, to the cable widths (W) of at least 1.6cm, by at least six conductor groups (100a-100f) of screened film (130,140) shielding insulation conductor (112,113), to form screening strap cable, wherein said screened film (130,140) comprises cover part (150) and separates the pressing section (155) of described cover part (150).

Description

Shielded type cable

Technical field

The utility model relates in general to cable.

Background technology

Cable for transmission of electric signals is well-known.A kind of cable of universal class is coaxial cable.Coaxial cable generally include by insulator around electric lead.Line and insulator by shielding part institute around, and line, insulator and shielding part by sheath around.The cable of another kind of universal class is the shielded type cable comprising one or more insulating signal conductor, the screen institute that described one or more insulating signal conductor is such as formed by metal forming around.For the ease of electrical connection screen, sometimes other non-insulated conductor is set between screen and the insulator of one or more signal conductor.The cable of these two kinds of universal classes all requires to use for the specially designed connector of termination usually, and be usually unsuitable for using batch termination technology, that is, multiple conductor is connected to each contact element, such as, contact element on the electric contact of electric connector or printed circuit board (PCB) simultaneously.

Utility model content

The utility model relates in general to the shielded type cable forming screening strap cable.Specifically, to the cable widths of at least 1.6cm, by least six of screened film shielding insulation conductor independently conductor groups, to form screening strap cable, described screened film comprises cover part and separates the pressing section of cover part.On the one hand, the utility model provides a kind of shielded type cable, and it length comprised along cable extends and at least six the conductor groups be spaced apart from each other along the width of cable, and each conductor group comprises two or more insulated electric conductors; First end conductor and the second end conductor separate the width distance of at least 1.6cm.Shielded type cable also comprises the first screened film and secondary shielding film that are arranged on the first relative side of cable and the second side, described first screened film and secondary shielding film comprise cover part and pressing section, make in cross-section, the cover part of described first screened film and described secondary shielding film combines and substantially surrounds each conductor group, and the pressing section of described first screened film and secondary shielding film combines the pressing section forming cable in every side of each conductor group.Shielded type cable also comprises adhesive phase further, and the first screened film is bonded to secondary shielding film by described adhesive phase in the pressing section of cable.Maximum spacing between the cover part of described first screened film and described secondary shielding film is D; The first minimum spacing between the pressing section of described first screened film and described secondary shielding film is d1; And d1/D is less than 0.25.In region in region in conductor group and between adjacent insulated electric conductor, the second minimum spacing between the cover part of described first screened film and described secondary shielding film is d2; D2/D is greater than 0.33; And length is that the impedance of each conductor group of at least 1 meter is within 10% of the average impedance of the conductor group of equal length.

Above-mentioned utility model content is not intended to describe each disclosed embodiment of the present utility model or often kind of embodiment.The following drawings and embodiment more particularly exemplify exemplary embodiment.

Accompanying drawing explanation

Whole specification reference accompanying drawing, in the accompanying drawings, element like similar drawing reference numeral representation class, and wherein:

Fig. 1 illustrates the schematic cross sectional views of shielded type cable;

Fig. 2 A-2F illustrates the schematic cross sectional views of exemplary shield cable;

Fig. 3 A illustrates the schematic cross sectional views of shielded type cable;

Fig. 3 B illustrates the schematic top plan view of the shielded type cable of Fig. 3 A; And

Fig. 4 illustrates the curve chart of the impedance data of the shielded type cable from Fig. 3 A-3B.

Accompanying drawing may not be drawn in proportion.The like numerals will used in accompanying drawing refers to similar assembly.But, should be appreciated that and use label to be not intended to be limited in another accompanying drawing with the assembly of identical labelled notation to the assembly referred in given accompanying drawing.

Embodiment

Many high-velocity electrons connection schemes need a more than parallel transmission passage; Such as, coaxial or twin-core transmission channel.Some emerging schemes can use at least eight or more parallel differentiation passages.This type of scheme for the flat cable structure evenly compressed comprises the name submitted to such as on August 31st, 2010 and is called the twin cable described in the U.S. Patent Application Serial Number 61/378877 of " CONNECTOR ARRANGEMENTS FOR ELECTRICAL CABLES " (connector of cable is arranged) (attorney 66887US002).

Along with quantity and the speed raising of interconnection device, between such device, the cable of signal transmission needs less, and can transmit signal more at a high speed when not having unacceptable interference or crosstalk.The interaction using shielding to reduce in some cables between signal that adjacent conductor transmits.Many configurations with substantially flat in cable as herein described, and the conductor group comprising that the length along cable extends, and be arranged on the electric screen film on the opposite side of cable.The pressing section of the screened film between adjacent conductor group contributes to electrically isolated from one for conductor group.Many in cable also comprise and are electrically connected to shielding part and the drain wire extended along the length of cable.This cable configuration can contribute to simplifying the connection with conductor group and drain wire, reduces the size that cable connects site, and/or offers an opportunity for the batch end-blocking of cable.

In certain methods, thicker metal or metal material can be used as screened film to form semi-rigid cable.Such as, aluminium or other metals can be used in this method and without the need to polymer-backed film.Make aluminium (or other materials) by shaping dies to produce the gauffer forming cover part and pressing section in aluminium.Insulated electric conductor is placed in the gauffer forming cover part.If use drain wire, then can form less gauffer for drain wire.Insulated electric conductor and optional drain wire are clipped between relative gauffer aluminium lamination.Such as, aluminium lamination useful binders combines or welds together.Connection between the gauffer aluminium screened film of upper and lower can through on-insulated drain wire.

In the exemplary embodiment, the overlay area of shielded type cable comprises concentric region and is positioned at the transitional region on given conductor group one or both sides.The part of the given screened film in concentric region is called as the dwell of cam of screened film, and the part of screened film in transitional region is called as the transition portion of screened film.Transitional region can be configured to provide the high manufacturability of shielded type cable and eliminate strain and stress.Transitional region is made to keep substantially consistent configuration (to comprise along the length of shielded type cable, as aspects such as size, shape, capacity and radius of curvature) contribute to making shielded type cable have substantially consistent electrical property, such as, high-frequency isolation, impedance, deviation, insertion loss, reflection, mode conversion, eye opening and shake.

In addition, in certain embodiments, such as wherein conductor group comprise two along cable length extend, be disposed generally in single plane and be effectively arranged to can differential pair circuit arrangement connect biaxial cable insulated electric conductor embodiment in, by making transition portion keep basically identical configuration along the length of shielded type cable, can advantageously for the conductor of two in conductor group provides the substantially the same electromagnetic field deviation departing from desirable situation with one heart.Therefore, careful this transition portion of control contributes to making cable obtain favourable electrical property and characteristic along the configuration of shielded type cable length.

The widest cable of the banded cable construction manufacture of compression before use (by two outer tunnels outward flange between distance limit) be approximately 15mm, and comprise eight passages or less passage (for 32AWG line, only 8 passages).The demand that the larger wire gauge of larger amt passage and/or larger connector compress makes to be difficult to all passages to coordinate width to be less than connector or the cable of 15mm.Two or more cables of placement arranged side by side are possible solutions, but its shortcoming had, and comprise and need to manage many cables, and owing to there are at least two extra cable edges, cause density to reduce.In addition, owing to increasing material, increase consumption and may be narrower process width and increase the manufacturing cost of multi-band.The solution of single wide cable is better than the passage of multiple separation or multiple flat cable.

Wide, multichannel flat cable for high speed data transfer need each passage to have to control good geometry, and this causes impedance to be subject to good control.Use the compression shielding structure of at least one combined shielding film by film is shaping and form passage at least side of each passage in cable side.Change in any size or imbalance can cause electric capacity along parallel portion length and inductance unbalance.This can cause again along the impedance unbalance between the impedance contrast and adjacent conductor group of plastic zone length of field.At least for those reasons, may need to control the interval between screened film.In some cases, the pressing section of the screened film that cable on conductor group both sides compresses in region is spaced the distance within about 0.05mm.Because there is wide cable and there is many passages, can become and more and more be difficult to realize unified precision required in whole cable widths.To in wide cable conforming one to measure be the High-speed Electric character of more each passage relative to other passage.

In some cases, passage relative to other passage impedance (if being intended to same impedance) and in addition along the consistency of the channel impedance of cable length can be important parameter.For high-speed interconnect, the level of this impedance Control should within 10% (if passage is intended to be same impedance) and should within 10% in the appropriate distance (such as, 1 meter) of each passage for different passage.If passage not intended to be are same impedance (such as, 100 ohm to the nominal impedances of 85 ohm), so another of each passage is measured as its mean value within 10% or 5% of nominal value or in given length.Any impedance variation along transmission line length may cause power reflection to get back to source, instead of is transferred to target.It is desirable to, transmission line will not have impedance variation along its length, but according to expection application, changing up to 5%-10% at given length (all such as (e.g.) 1 meter) internal object resistance value (such as 50 ohm) is acceptable.

Can by conductor group and screened film according to impedance Control relation cooperatively construct.In one aspect, this means, in the conforming situation of the geometry needed for the length along shielded type cable, realize screened film the part of conductor group is covered, be suitable for expecting to provide the acceptable impedance variation applied.In one embodiment, along representative cable length (such as, 1m), this impedance variation for being less than 5 Ω, and is preferably less than 3 Ω.On the other hand, if insulated electric conductor is arranged to twin shaft and/or differential pair cable arrangements mode effectively, geometry needed for then this means between the insulated electric conductor of a centering realizes screened film and covers the part of conductor group consistent, be suitable for expecting to provide the acceptable impedance variation applied.In some cases, along representational cable length (such as, 1m), impedance variation for being less than 2 Ω, and is preferably less than 0.5 Ω.

Near-end cross and/or far-end cross talk can be signal integrity in any cable comprising cable disclosed in the utility model and cable assembly or the important of shielding is measured.In the cable and make in termination area holding wire (e.g., twin-concentric to or other conductor groups) be closely grouped in and often increase bad crosstalk together, but cable design disclosed herein and termination design can be used to offset this trend.The problem of the crosstalk in cable and the crosstalk in connector can separately solve, but these can together for increasing the minimizing of crosstalk for the some persons in the method for crosstalk minimizing.In order to increase radioshielding and reduce the crosstalk in cable disclosed in the utility model, two screened films needing to be used on the opposite side of cable form the complete as far as possible shielding part around conductor group (e.g., twin-concentric to).Therefore, needing to form screened film combines substantially around any given conductor group, as at least 75% or at least 80%, 85% or 90% of conductor group periphery to make its cover part.Also usually need to minimize any gap between the screened film in (comprising elimination) cable compression section, and/or use the Low ESR between two screened films or direct electrical contact (such as by directly contacting or touching, or via the electrical contact of one or more drain wire, or use the electroconductive binder between screened film).If for given cable or system specialization or " transmission " and " reception " twin-concentric of defining separation to or conductor, then also can by identical flat cable in possible degree, this type of " transmission " conductors all are physically divided into groups with being closely adjacent to each other, and this type of " reception " conductors all are divided into groups with being closely adjacent to each other but with transmission to separating, strengthens in cable and/or the radioshielding at termination components place.Also the transmission group of conductor can be separated with the reception group of conductor by one or more drain wire herein described by other places or other isolation structures.In some cases, two flat cables be separated can be used (one for transmission conductor, article one, for receiving conductor), but these two (or more bar) cables are preferably arranged with side-by-side configuration and arrange, make the advantage of the single pliability plane that can maintain flat cable non-stackingly.

Fig. 1 illustrates the schematic cross sectional views of the shielded type cable 100 according to one side of the present utility model.Such as, be found in about the details of this screening strap cable construction the name submitted on August 31st, 2010 to be called in the U.S. Patent Application Serial Number 61/378877 of " CONNECTOR ARRANGEMENTS FOR ELECTRICAL CABLES " (connector of cable is arranged) (attorney 66887US002).Shielded type cable 100 comprises six conductor group 110a-110f, optional sideband conductor 110g, optional first ground connection/row disturbs conductor 120a and second ground connection/row and disturbs conductor 120b, is arranged on the first screened film 130 of shielded type cable 100 opposite side and secondary shielding film 140.Should be appreciated that if needs, shielded type cable 100 can comprise more than six conductor groups, and the optional ground connection/row of the optional sideband conductor and any amount that can comprise any amount disturbs conductor.The position of each that conductor group, sideband conductor and ground connection/row disturb in conductor is also unrestricted, but, in some cases, maybe advantageously make cable symmetrical as much as possible, thus it is minimum that the crosstalk between the signal of telecommunication is dropped to.

Six conductor group 110a-110f, optional sideband conductor 110g and optional first ground connection/row disturb resistance 120a and second ground connection/row disturb in resistance 120b each all substantially by by the first screened film 130 and secondary shielding film 140 the cover part 150 be combined to form around.The border of every side, each cover part 150 is limited by the pressing section 155 the first screened film 130 being compressed together with secondary shielding film 140 formation.First screened film 130 is bonded to secondary shielding film 140 by adhesive phase 116 in the pressing section 155 of shielded type cable 100.In some cases, adhesive phase 116 can also extend to and disturb resistance around six conductor group 110a-110f, optional sideband conductor group 110g and optional first ground connection/row and second ground connection/row disturbs in the cover part 150 of each in resistance 120.

In a particular embodiment, each in six conductor group 110a-110f comprises two insulated electric conductors, these two insulated electric conductors comprise by the first insulator 113 around the first conductor 112 and by the second insulator 115 around the second conductor 114.In some cases, each in six conductor group 110a-110f can comprise the insulated electric conductor greater or less than two; But two insulated electric conductors can be preferred.In some cases, one or more in six conductor group 110a-110f can also comprise one or more ground connection/row and disturb conductor (not shown) in cover part 150, as explained elsewhere.

Record from the outward flange of end conductor (such as, the first conductor group 110a and the 6th conductor group 110f), the width " W " of shielded type cable 100 can be greater than about 1.6cm, as shown in fig. 1.In some cases, width " W " can be greater than about 2cm, or is even greater than about 3cm.The first screened film 130 in cover part 150 and secondary shielding film 140 can comprise maximum spacing " D ", and the first screened film 130 and secondary shielding film 140 can comprise minimum spacing " d1 " in pressing section 155." D " and " d1 " is correlated with, and makes ratio " d1/D " be less than about 0.25, or is less than about 0.20, or be less than about 0.15, or be even less than about 0.10.

In region in region in conductor group 110a-110f and between adjacent insulated electric conductor, the right bulk density of shielded type cable inner wire can be relevant to the minimum spacing " d2 " between the first screened film and the cover part of secondary shielding film, wherein " d2 " and " D " is correlated with, ratio " d2/D " is made to be greater than about 0.33, or be greater than about 0.40, or be greater than about 0.45, or be even greater than about 0.50.

The electrical characteristics of cable determine whether cable is applicable to high speed transmission of signals.Except other characteristics, the electrical characteristics of cable also comprise characteristic impedance, insertion loss, crosstalk, deviation, eye opening and shake.Electrical characteristics can be depending on the physical geometry (as previously mentioned) of cable, also can be depending on the material behavior of cable element.Therefore, it is generally contemplated that keep substantially consistent physical geometry and/or material behavior along cable length.Such as, physical geometry and the material behavior of cable is depended in the characteristic impedance of cable.If cable is consistent in physics with material along its length, then the characteristic impedance of cable also will be consistent.But the geometry of cable and/or the uneven of material behavior cause the impedance mismatching at uneven some place.

In some cases, can control physical geometry and the material behavior of described shielded type cable 100, thus make when measuring the cable length of at least one meter, the change of the characteristic impedance of each conductor group 110a-110f of shielded type cable 100 is minimum.In some cases, the change that the characteristic impedance of each conductor group 110a-110f of shielded type cable 100 is minimum can occur in when measuring the cable length of at least two meters.The minimum change of the characteristic impedance of each conductor group 110a-110f can within 10% of the average impedance of the conductor group 110a-110f of equal length, or within 8%, or within 5%, or even within 1%.

Fig. 2 A-2F illustrates the schematic cross sectional views according to the utility model exemplary shield cable on the one hand.As obvious to one skilled in the art, all elements " D " as shown in Figure 1, " d1 ", " d2 ", " W " and 112-155 are applied to Fig. 2 A-2F comparably; But, for simplicity's sake, no longer repeated description.

In fig. 2, shielded type cable 200 comprises the first to the 8th conductor group 200a-200g, and it is along width " W " distribution being greater than about 1.6cm.First ground connection/drain wire 220a and the second ground connection/drain wire 220b is arranged on the either end of cable.

In fig. 2b, shielded type cable 201 comprises the first to the 6th conductor group 201a-201f, and it is along width " W " distribution being greater than about 1.6cm.In addition the 7th and the 8th conductor group 201g, 201h are by the width extending of cable more than 1.6cm, and the first ground connection/drain wire 221a and the second ground connection/drain wire 221b is arranged on the either end of cable.

In fig. 2 c, shielded type cable 202 comprises the first to the 6th conductor group 202a-202f, and it is along width " W " distribution being greater than about 1.6cm.First ground connection/drain wire 222a and the second ground connection/drain wire 222b is arranged on the either end of cable.

In figure 2d, shielded type cable 203 comprises the first to a 6th conductor group 203a-203f and group four sideband 203g, and it is along width " W " distribution being greater than about 1.6cm.First ground connection/drain wire 223a and the second ground connection/drain wire 223b is arranged on the either end of cable.

In Fig. 2 E, shielded type cable 204 comprises the first to the 6th conductor group 204a-204f and the minimum widith spacing " d2E " between the 3rd conductor group 204c and the 4th conductor group 204d, and it is all along width " W " distribution being greater than about 1.6cm.First ground connection/drain wire 224a and the second ground connection/drain wire 224b is arranged on the either end of cable.

In fig. 2f, shielded type cable 205 comprises the first to the 6th conductor group 205a-205f, and it is along width " W " distribution being greater than about 1.6cm.In shielded type cable 205, at least one screened film (such as, secondary shielding film 140 as shown in Figure 1) keep smooth, the name as submitted on August 31st, 2010 is called described in the U.S. Patent Application Serial Number 61/378877 of " CONNECTOR ARRANGEMENTS FOR ELECTRICAL CABLES " (connector of cable is arranged) (attorney 66887US002).

example

The example of shielded type cable 300 shown in Fig. 3 A, illustrates the schematic cross sectional views of cable.Shielded type cable 300 has the first screened film 330 of the aluminium foil be bonded together with adhesive phase 316 and the secondary shielding film 340 of aluminium foil at the either side of cable.Be called that the process described in the U.S. Patent Application Serial Number 61/378877 of " CONNECTOR ARRANGEMENTS FOR ELECTRICAL CABLES " (connector of cable is arranged) (attorney 66887US002) prepares cable according to the name submitted on August 31st, 2010.The thick 0.072mm of aluminium foil, and adhesive phase comprises nine the conductor group 310a-310i closed based on polyolefinic adhesive and paired conductor of thick 0.0254mm.Nine conductor group 310a-310i are arranged in the width " W " of 2.44cm.Each in paired conductor comprises the silver-coated copper wire of two 30AWG with polyolefin insulation, and its external diameter is 0.79mm.In shown structure, shielded type cable 300 also comprises the tin-coated copper drain wire of one group of five sideband 310j (each sideband is the tinned wird of the 30AWG with polyolefin insulation, and its external diameter is 0.79mm) and 4 uninsulated 30AWG at center.

Fig. 3 B illustrates the schematic top plan view of shielded type cable 300.In the rise time of 35ps, cable for different length uses domain reflectometer (TDR, Oregon can be derived from than the Tektronix Ltd. of not pausing (Tektronix Inc, Beaverton, OR), model is CAS8000) measure the electrical characteristics (such as, impedance) of cable, as shown in Figure 3 B.Length " L "=2 meter between first end 301 and cut cable 310, records the first impedance measurements " I1 " for each in conductor group 310a-310i.Remove the section of " l2 "=0.2 meter, and " L ” – " l1 "=1.8 meter records the second impedance measurements " I2 " for each in conductor group 310a-310i for remaining length.By removing the section of four 0.2 meter subsequently again and carrying out this process of repetition for each the place's measurement impedance in residue length.Fig. 4 illustrates the curve chart of the impedance data of the shielded type cable from Fig. 3 A-3B, and its scope is from one meter to two meters, is spaced apart 0.2 meter.

It is below the list of each embodiment of the utility model.

1 is shielded type cable, and it comprises: at least six conductor groups, and its length along described cable extends and width along described cable is spaced apart from each other, and each conductor group comprises two or more insulated electric conductors; First end conductor and the second end conductor, it separates the width distance of at least 1.6cm; First screened film and secondary shielding film, it is arranged on the first relative side and second side of described cable, described first screened film and secondary shielding film comprise cover part and pressing section, described cover part and described pressing section are arranged such that in cross-section, the described cover part of described first screened film and secondary shielding film combines and substantially surrounds each conductor group, and the described pressing section of described first screened film and secondary shielding film combines the pressing section forming described cable in every side of each conductor group; And adhesive phase, described first screened film is bonded to described secondary shielding film by this adhesive phase in the described pressing section of described cable; Wherein: the maximum spacing between the cover part of described first screened film and described secondary shielding film is D; The first minimum spacing between the pressing section of described first screened film and described secondary shielding film is d1; D1/D is less than 0.25; In region in region in described conductor group and between adjacent insulated electric conductor, the second minimum spacing between the cover part of described first screened film and described secondary shielding film is d2; D2/D is greater than 0.33; And length is that the impedance of each conductor of at least 1 meter is within 10% of the average impedance of the conductor group of equal length.

2 is the shielded type cables according to item 1, and wherein said width distance is at least 2cm.

Item 3 is the shielded type cables according to item 1 or item 2, and wherein said width distance is at least 3cm.

Item 4 is the shielded type cables according to item 1 to item 3, and wherein d1/D is less than 0.20.

Item 5 is the shielded type cables according to item 1 to item 4, and wherein d1/D is less than 0.15.

Item 6 is the shielded type cables according to item 1 to item 5, and wherein d1/D is less than 0.10.

Item 7 is the shielded type cables according to item 1 to item 6, and wherein d2/D is greater than 0.40.

Item 8 is the shielded type cables according to item 1 to item 7, and wherein d2/D is greater than 0.45.

Item 9 is the shielded type cables according to item 1 to item 8, and wherein d2/D is greater than 0.50.

Item 10 is the shielded type cables according to item 1 to item 9, and wherein length is that the impedance of each conductor group of at least 1 meter is within 8% of the average impedance of the conductor group of equal length.

Item 11 is the shielded type cables according to item 1 to item 10, and wherein length is that the impedance of each conductor group of at least 1 meter is within 5% of the average impedance of the conductor group of equal length.

Item 12 is the shielded type cables according to item 1 to item 11, and wherein length is that the impedance of each conductor group of at least 1 meter is within 1% of the conductor group average impedance of equal length.

Item 13 is the shielded type cables according to item 1 to item 12, and wherein length is that the impedance of each conductor group of at least 2 meters is within 10% of the average impedance of the conductor group of equal length.

Item 14 is the shielded type cables according to item 1 to item 13, and wherein length is that the impedance of each conductor group of at least 2 meters is within 8% of the average impedance of the conductor group of equal length.

Item 15 is the shielded type cables according to item 1 to item 14, and wherein length is that the impedance of each conductor group of at least 2 meters is within 5% of the average impedance of the conductor group of equal length.

Item 16 is the shielded type cables according to item 1 to item 15, and wherein length is that the impedance of each conductor group of at least 2 meters is within 1% of the average impedance of the conductor group of equal length.

Except as otherwise noted, otherwise all numerals of the size of the expression parts used in the specification and in the claims, quantity and physical characteristic be appreciated that and modified by word " about ".Therefore, unless the contrary indication, otherwise the numerical parameter listed in above-mentioned specification and claims is approximation, this approximation can be changed according to the desirable characteristics that those skilled in the art utilize instruction content disclosed herein to seek to obtain.

The all lists of references quoted herein and publication all clearly in full way of reference be incorporated in the utility model, but except its part directly may conflicted with the utility model.Although illustrate and describe specific embodiment herein, but those of ordinary skill in the art should be understood that, when not departing from scope of the present utility model, a large amount of alternative forms and/or equal execution mode can substitute specific embodiment that is shown and that describe.Present patent application is intended to any change and the change that cover the specific embodiment discussed herein.Therefore, expect that the utility model should only be limited by claims and its equivalents.

Claims (6)

1. a shielded type cable, comprising:

At least six conductor groups, its length along described cable extends and width along described cable is spaced apart from each other, and each conductor group comprises two or more insulated electric conductors;

First end conductor and the second end conductor, it separates the width distance of at least 1.6cm;

First screened film and secondary shielding film, on its first relative side being arranged on described cable and the second side, described first screened film and secondary shielding film comprise cover part and pressing section, described cover part and described pressing section are arranged such that in cross-section, the described cover part of described first screened film and secondary shielding film combines substantially around each conductor group, and the described pressing section of described first screened film and secondary shielding film combines the pressing section forming described cable in every side of each conductor group; And

Adhesive phase, described first screened film is bonded to described secondary shielding film by it in the described pressing section of described cable;

Wherein:

Maximum spacing between the described cover part of described first screened film and described secondary shielding film is D;

The first minimum spacing between the described pressing section of described first screened film and described secondary shielding film is d1;

D1/D is less than 0.25;

In region in region in described conductor group and between adjacent insulated electric conductor, the second minimum spacing between the described cover part of described first screened film and described secondary shielding film is d2;

D2/D is greater than 0.33; And

Length is that the impedance of each conductor group of at least 1 meter is within 10% of the average impedance of the described conductor group of equal length.

2. shielded type cable according to claim 1, wherein said width distance is at least 2cm.

3. shielded type cable according to claim 1, wherein said width distance is at least 3cm.

4. shielded type cable according to claim 1, wherein length is that the impedance of each conductor group of at least 1 meter is within 5% of the average impedance of the described conductor group of equal length.

5. shielded type cable according to claim 1, wherein length is that the impedance of each conductor group of at least 0.5 meter is within 10% of the average impedance of the described conductor group of equal length.

6. shielded type cable according to claim 1, wherein length is that the impedance of each conductor group of at least 0.5 meter is within 1% of the average impedance of the described conductor group of equal length.