US3876964A - Flat flexible transmission cable - Google Patents

Flat flexible transmission cable Download PDF

Info

Publication number
US3876964A
US3876964A US390813A US39081373A US3876964A US 3876964 A US3876964 A US 3876964A US 390813 A US390813 A US 390813A US 39081373 A US39081373 A US 39081373A US 3876964 A US3876964 A US 3876964A
Authority
US
United States
Prior art keywords
conductors
cable
ground
signal
flat flexible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US390813A
Inventor
Ammon Nazareth Balaster
Richard John O'neill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TE Connectivity Corp
Original Assignee
AMP Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AMP Inc filed Critical AMP Inc
Priority to US390813A priority Critical patent/US3876964A/en
Priority to CA206,457A priority patent/CA1002132A/en
Priority to NL7410660A priority patent/NL7410660A/en
Priority to GB3518774A priority patent/GB1468862A/en
Priority to ES429225A priority patent/ES429225A1/en
Priority to IT26340/74A priority patent/IT1019969B/en
Priority to AR255220A priority patent/AR200091A1/en
Priority to DE2439853A priority patent/DE2439853C2/en
Priority to BR6883/74A priority patent/BR7406883D0/en
Priority to BE147804A priority patent/BE819067A/en
Priority to SE7410624A priority patent/SE397148B/en
Priority to AT684574A priority patent/AT333868B/en
Priority to FR7428835A priority patent/FR2241854B1/fr
Priority to JP49096940A priority patent/JPS5840284B2/en
Publication of US3876964A publication Critical patent/US3876964A/en
Application granted granted Critical
Priority to AT987675A priority patent/AT341598B/en
Priority to CA254,493A priority patent/CA1006929A/en
Priority to SE7613682A priority patent/SE427883B/en
Priority to AT380477A priority patent/AT347524B/en
Priority to HK191/79A priority patent/HK19179A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0237—High frequency adaptations
    • H05K1/025—Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
    • H05K1/0253—Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0838—Parallel wires, sandwiched between two insulating layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0846—Parallel wires, fixed upon a support layer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0393—Flexible materials
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09236—Parallel layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09263—Meander
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09727—Varying width along a single conductor; Conductors or pads having different widths

Definitions

  • ABSTRACT Improved flat flexible cable having at least one shielded transmission line.
  • the subject cable is formed with either a single or a plurality of signal conductors on one side of a flat flexible insulator substrate and one or a plurality of ground conductors on the opposite side of the substrate, the ground conductors preferably being interconnected.
  • Pads are formed at periodically spaced intervals along each of the signal and ground conductors so that the cable can be produced with infinite length and cut to finite lengths at the pads nearest the desired length while maintaining constant electrical transmission properties- (such as characteristic impedance, cross-talk, attenuation, etc.) throughout the length of the line and including the termination area.
  • the present invention relates to an improvement in shielded flat flexible cable and in particular to cable which can be produced in infinite length and cut for termination at lengths approximating the desired length without degrading the electrical transmission characteristics of the lines.
  • the cable includes a plurality of signal conductors 21 and two shielding conductors 22 formed on one side of a flexible plastic base material 23.
  • the cable thus produced is sliced into thirds, stacked and laminated with an insulating cover layer 24 to form a single cable.
  • Such a teaching has many obvious disadvantages amongst which are the additional manufacturing steps required for the slicing and laminating operations as well as possible alignment problems. Further, this teaching does not solve the problem of providing appropriate termination means so that long lengths of cable can be produced and subsequently cut to discrete lengths. Also, this teaching does not disclose how to control the characteristic impedance of the cable thus produced.
  • the subject shielded flat flaxible cable includes a flexible substrate having at least one signal transmission conductor formed on one side thereof and at least one shielding or grounding conductor formed on the opposite side of the substrate. Both the signal and ground conductors are provided with a plurality of periodically spaced termination pads each adapted to receive crimp connector means and which maintain integrity of the electrical transmission properties of the cable. When additional shielding is desired for high density wiring applications, the subject cable is folded upon itself so that the ground conductors substantially enclose the signal transmission conductor. When a plurality of ground conductors are used, it is preferable to have these ground conductors interconnected to provide a common ground having a plurality of alternate paths.
  • cross-talk both cable-to-cable and line-to-line
  • attenuation capacitance, propagation time, etc.
  • adequate electrical shielding characteristics for use in high density wiring applications where signal rise times are in the nano-second region.
  • the periodic termination pads additionally provide greater effective skin conductor areas to reduce attenuation effects over the parallel conductor designs of similar dimensions.
  • FIG. 1 is a plan view of a first embodiment of the subject flat flexible transmission cable before being folded to form a shielded line;
  • FIG. 2 is a plan view of the first embodiment of FIG. 1 showing the subject cable in the finished folded condition
  • FIG. 3 is a vertical transverse section through the subject cable taken along line 3-3 of FIG. 2;
  • FIG. 4 is a plan view of a second embodiment of the subject invention showing multiple signal lines and multiple ground lines;
  • FIG. 5 is a plan view of a third embodiment of the present invention.
  • FIG. 6 is a perspective view of a fourth embodiment of the present invention.
  • FIG. 7 is a transverse vertical section taken along line 7-7 in FIG. 6 and showing the fourth embodiment cable after being folded;
  • FIG. 8 is a transverse vertical section, similar to FIG. 7, schematically illustrating a fifth embodiment with interconnection of the top and bottom ground conductors through the odd numbered signal conductors to form a series of completely shielded transmission lines.
  • the first embodiment of the subject flat flexible transmission cable is intended for use in high density wiring situations where it is desirable to provide controlled characteristic impedance with adequate electrical shielding and having signal rise times in the nanosecond region.
  • a flat flexible dielec tric substrate 10 has a signal conductor 12 formed on one side and a ground conductor 14 formed on the opposite side. Both the signal and ground conductors can be formed by any of the well known printing and etching techniques.
  • the cable is formed with the signal conductor laterally offset from the longitudinal axis of the cable and the ground conductor is formed with a regularly meandering pattern, in this instance a zig-zag configuration.
  • the pattern of the ground conductor is such that it covers substantially the entire width of the cable.
  • the cable is cut transversely at points 16, near the terminal pads 18 and 20 of the signal and ground conductors, respectively, and the portion of the cable between the cuts is folded upon itself, as shown in FIGS. 2 and 3.
  • the folded cable is fixed in the folded condition by any appropriate means, such as by known adhesives.
  • Terminal connector 22 and 24 are attached to the signal and ground conductor pads 18 and 20, respectively, either from opposite directions, as shown in FIG. 2, or from the same side of the transmission cable. Examples of suitable crimped on terminal connectors may be found in US. Pat. Nos. 3,395,381; 3,553,836; 3,663,922; and 3,697,925.
  • the characteristic impedance of the folded transmission line is determined by the wave length or the pitch of the ground line as well as the thickness and dielectric properties of the substrate. This foldover concept can also be utilized with a plurality of conductors, as will be discussed with reference to the fourth and fifth embodiments, since the problem of critical alignment of parallel shields is obviated.
  • the flexible dielectric substrate 26 has a plurality of substantially parallel signal transmission conductors 28 formed on one side thereof with each of the signal conductors having formed thereon a plurality of periodically spaced pads 30 which are suitable for terminations purposes.
  • a plurality of substantially parallel ground conductors 32 are formed on the opposite side of the substrate 26 with pads 34 formed therealong in spaced relationship. It should be noted that the number of ground conductors exceeds the number of transmission conductors by one so that the transversely outermost conductor always is a ground conductor.
  • At least one conductor 36 interconnects all of the ground conductors 32, preferably at each pad 34.
  • the flexible substrate may be of any well known dielectric material, such as Mylar, and the circuits may be formed thereon by any of the well known printing and etching techniques.
  • the pattern of the signal and transmission conductors of this embodiment is formed by a plurality of interlocking ground and signal pads.
  • the pads are alternated from between the top and bottom layers so that an insulation displacement crimp can be affected on any pad without disturbing the opposite conductor layer. Termination of each conductor is possible at spaced intervals along the cable with ground pads 38 making it possible for conventional (not matched impedance) connectors to be fixed to the cable in line. Individual ground connections can be made with ground pads 34 for matched impedance connector schemes.
  • the rectangular pads of the strip line conductors also provide a small series inductance at each interval which acts to increase the normal characteristic impedance without increasing the slot width between signal and ground conductors.
  • the electrical characteristics of this design are comparable to known parallel conductor cables.
  • the impedance is controlled by adjusting the signal and ground pad and conductor proximity.
  • the disclosed cable can be terminated using any of the well known flat flexible cable connectors, such as those crimp connectors mentioned in the above listed patents as well as soldered on connectors.
  • the third embodiment of the present invention is shown in FIG. 5.
  • the flexible dielectric substrate 40 has a signal conductor 42 formed on one side with a plurality of termination pads 44 periodically spaced therealong.
  • the opposite side of the substrate has a ground line formed thereon which includes a pair of parallel spaced conductors 46 provided with periodically spaced, terminal pads 48 and 50, respectively, and interconnected by a plurality of parallel spaced conductors 52.
  • the signal and ground conductors can be formed on the substrate by any of the well known and previously discussed techniques.
  • This embodiment of the subject cable has controlled electrical transmission properties throughout its length including the termination areas.
  • This embodiment is also suitable for matched impedance connectors and can be made in either a folded configuration, similar to the first embodiment, or multi-line configuration, similar to the second embodiment.
  • the fourth embodiment differs from the previous embodiments in that the flexible insulator substrate 54 has a plurality of parallel spaced signal conductors 56 formed on one side and two separate ground conductors 58 and 60 formed on the opposite side.
  • the signal conductors are transversely offset with respect to the cable but aligned with one of the ground conductors, the ground conductors being symmetrical with respect to the cable.
  • the cable is folded and secured in the folded condition in the same manner as the first embodiment discussed above.
  • the ground conductors in this embodiment can be interconnected by terminal connectors (not shown).
  • the fifth embodiment has a folded flexible insulator substrate 62 having a plurality of signal conductors 64 and two ground conductors 66 and 68. Every other signal conductor is connected to both ground conductors by means 70 to form a series of transmission lines similar, in many respects, to coaxial cable.
  • the connection of the conductors may be effected by anyone of a number of known means including spot bonding, stapling, stitching with metallic wire, etc.
  • ground conductors 58 and 60 have been shown in FIG. 6 with a sawtooth pattern that would have the ground conductors in phase in the folded condition of the cable. It should be understood that other patterns, both in and out of phase with one another, are also suitable for use in the subject cable.
  • the primary requirement of the ground line pattern is that it must extend past the outer most edges of the transmission lines.
  • Part of the characteristic impedance of the subject cable is directly related to the thickness of the dielectric material between the signal and ground conductors. To enable high impedance within the design limit is thus a major development concern particularly for the folded embodiments.
  • Increases slot width in the ground plane also increases the cable to cable crosstalk.
  • Reduced signal conductor width and thickness serves to increase the impedance while reduction of the thickness dimension will increase the high frequency attenuation. Any discontinuities in the signal or ground patterns for purposes of termination result in altered electrical characteristics which generally degrade cable performance.
  • the design requirements for the subject cable dictate geometric patterns for the signal and ground conductor which provide high characteristics impedance with minimum thickness of the dielectric material between the signal and ground conductor layers. Cross-talk and high frequency attenuation must also be kept to within acceptable limits.
  • the pattern shown in the accompanying drawings are designed to introduce series inductance within the lines as a possible means of increasing the typical characteristic impedance.
  • the periodic rectangular pads in each line act as small series inductances.
  • impedance is increased by adding inductive reactance rather than the usual method of decreasing the capacitance.
  • This technique maintains the cross-talk values at approximately the same level while achieving higher characteristic impedances.
  • the design also provides for reduced high frequency attenuation of the signal line by increasing the overall effective surface area of the conductors.
  • the pads can also serve as termination areas providing for the previously discussed continuous termination feature.
  • the folded configuration introduces a problem of electrical connection of the upper and lower ground shields.
  • One method of interconnecting incorporates a fold over of the ground layer as illustrated in the first embodiment.
  • the folded approach introduces problems of alignment of the signal and ground patterns on conventional parallel line (slot) cables.
  • the zig-zag, general cross bar or transverse mesh patterns alleviate this problem of pattern alignment and provides for better cable to cable crosstalk characteristics than the standard slot design.
  • the characteristic impedance of the line is controlled by adjustment of the ground pattern pitch. The characteristic impedance parameter can thus be determined within the ground pattern alone so that the alignment between the ground and signal pattern is no longer of critical importance.
  • this approach provides a greater portion of the shielding directly over and under the signal conductors where it is most needed rather than to the sides of the signal conductors where radiation is relatively small.
  • An improved flexible flat cable with at least one shielded transmission line comprising:
  • At least one signal conductor formed on one side of said substrate, said at least one signal conductor being transversely offset with respect to the longitudinal axis of said cable;
  • At least one ground conductor formed on the opposite side of said substrate, said at least one ground conductor having a regular meandering configuration covering substantially the entire width of said cable;
  • each of said signal and said ground conductors having a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable,
  • said cable being folded upon itself between the end most termination pads whereby said at least one signal conductor is shielded on at least two sides by electrically connected ground lines.
  • said at least one ground conductor includes a pair of conductors each following the same regular meandering pattern but being out of phase with respect to each other.
  • said at least one ground conductor comprises a pair of spaced ground conductors, further comprising a plurality of conductors interconnecting said spaced conductors.
  • An improved flexible flat cable with at least one shielded transmission line comprising:
  • each of said signal and said ground conductors havin g a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut .to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable.
  • a flat flexible cable according to claim 6 further comprising:
  • conductor means interconnecting each of said plurality of ground conductors.
  • a flat flexible cable according to claim 9 further comprising a plurality of additiona termination pads formed on each of the laterally exterior ground donductors, said additional termination pads being transversely aligned with but spaced outwardly of the responsive rows of transversely aligned termination pads of said signal conductors.
  • a flat flexible cable according to claim 10 wherein connectors are attached to the end most aligned row of signal conductor termination pads and additional termination pads of said ground lines thereby providing an unmatched impedance connection for said cable.
  • a flat flexible cable having at least one transmission line comprising:
  • each signal conductor having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each signal conductor being in substantial transverse alignment across said cable,
  • each ground conductor having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each ground conductor being positioned in substantial transverse alignment across said cable and longitudinally between the termination pads of said signal conductors whereby constant specific characteristic impedance throughout the length of the cable is achieved.
  • a flat flexible transmission cable according to claim 12 further comprising a plurality of conductors interconnecting each of said plurality of ground conductors.
  • a flat flexible transmission cable according to claim 12 further comprising an additional termination pad formed on each of the transversely exterior ground conductors, said additional termination pads being in longitudinal alignment with but transversely spaced outwardly from respective rows of termination pads of said signal conductors thereby providing unmatched impedance termination for said cable.
  • each said signal conductor being shielded by ground conductors on at least two sides.
  • a flat flexible cable according to claim 16 further comprising a plurality of conductors interconnecting each of said ground conductors.
  • a flat flexible cable according to claim 16 further comprising a plurality of conductor means interconnecting said ground conductors and the odd numbered signal conductors through said substrate whereby said flat flexible cable simulates a plurality of coaxial cables.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Insulated Conductors (AREA)

Abstract

Improved flat flexible cable having at least one shielded transmission line is disclosed. The subject cable is formed with either a single or a plurality of signal conductors on one side of a flat flexible insulator substrate and one or a plurality of ground conductors on the opposite side of the substrate, the ground conductors preferably being interconnected. Pads are formed at periodically spaced intervals along each of the signal and ground conductors so that the cable can be produced with infinite length and cut to finite lengths at the pads nearest the desired length while maintaining constant electrical transmission properties (such as characteristic impedance, cross-talk, attenuation, etc.) throughout the length of the line and including the termination area.

Description

' United States Patent 1 Balaster et al.
. [22] Filed:
[ FLAT FLEXIBLE TRANSMISSION CABLE [73] Assignee: AMP Incorporated, Harrisburg, Pa.
Aug. 23, 1973 [21] Appl. No.: 390,813
[ 1 Apr. 8, 1975 3,609,600 9/1971 Kassabgi 333/84 R Primary ExaminerAlfred E. Smith Assistant Examiner-William 1:1. Punter Attorney, Agent, or FirmRussell J. Egan, Esq.
[ 5 7 ABSTRACT Improved flat flexible cable having at least one shielded transmission line is disclosed. The subject cable is formed with either a single or a plurality of signal conductors on one side of a flat flexible insulator substrate and one or a plurality of ground conductors on the opposite side of the substrate, the ground conductors preferably being interconnected. Pads are formed at periodically spaced intervals along each of the signal and ground conductors so that the cable can be produced with infinite length and cut to finite lengths at the pads nearest the desired length while maintaining constant electrical transmission properties- (such as characteristic impedance, cross-talk, attenuation, etc.) throughout the length of the line and including the termination area.
18 Claims, 8 Drawing Figures PATENTEDAPR 8|975 SHEET 1 OF PATENTEDAPR m SHEET 2 (IF 3 PATENTEDAPR 191s 3. 876,964 9 .313953 S A El so T FLAT FLEXIBLE TRANSMISSION CABLE BACKGROUND OF THE INVENTION 1. The Field Of The Invention The present invention relates to an improvement in shielded flat flexible cable and in particular to cable which can be produced in infinite length and cut for termination at lengths approximating the desired length without degrading the electrical transmission characteristics of the lines.
2. Description Of The Prior Art There are several problems associated with the known methods for the production of flat flexible transmission lines. One problem is the production of cable that can be manufactured in long lengths and cut to whatever shorter length is required for the particular equipment design. The cables produced by the conventional prior art methods have been produced in finite lengths, to fit a particular application, with pads formed at the ends thereof adapted to receive appropriate connectors. The termination pads disturb the delicate electrical characteristics of the transmission line (characteristic impedance, cross-talk, attenuation, etc.) and thus make continuous lengths of such known transmission line impractical. Another problem involved in the known methods of producing flexible flat cable is to provide controlled impedance throughout the cable length with adequate electrical shielding characteristics for use in high density wire applications where the signal rise times are in the nano-second region.
One attempt to produce a shielded flat flexible cable is disclosed in US. Pat. No. 2,963,535. The cable includes a plurality of signal conductors 21 and two shielding conductors 22 formed on one side of a flexible plastic base material 23. The cable thus produced is sliced into thirds, stacked and laminated with an insulating cover layer 24 to form a single cable. Such a teaching has many obvious disadvantages amongst which are the additional manufacturing steps required for the slicing and laminating operations as well as possible alignment problems. Further, this teaching does not solve the problem of providing appropriate termination means so that long lengths of cable can be produced and subsequently cut to discrete lengths. Also, this teaching does not disclose how to control the characteristic impedance of the cable thus produced.
SUMMARY OF THE INVENTION The subject shielded flat flaxible cable includes a flexible substrate having at least one signal transmission conductor formed on one side thereof and at least one shielding or grounding conductor formed on the opposite side of the substrate. Both the signal and ground conductors are provided with a plurality of periodically spaced termination pads each adapted to receive crimp connector means and which maintain integrity of the electrical transmission properties of the cable. When additional shielding is desired for high density wiring applications, the subject cable is folded upon itself so that the ground conductors substantially enclose the signal transmission conductor. When a plurality of ground conductors are used, it is preferable to have these ground conductors interconnected to provide a common ground having a plurality of alternate paths.
It is therefore an object of the present invention to produce flat flexible cable having controlled electrical transmission properties of characteristic impedance,
cross-talk (both cable-to-cable and line-to-line), attenuation, capacitance, propagation time, etc., with adequate electrical shielding characteristics for use in high density wiring applications where signal rise times are in the nano-second region.
It is another object of the present invention to produce flat flexible cable having electrical shielding on at least two sides of a flat signal conductor.
It is still another object of the present invention to teach a method of manufacturing shielded flat flexible cable which eliminates problems related to alignment of the signal and ground conductors and problems of interconnecting ground conductors.
It is yet another object of the present invention to provide flat flexible cable in which at least one signal conductor is formed on one side of a flexible insulator substrate at least one ground conductor is formed on the other side of the substrate, and the substrate folded upon itself so that simple and inexpensive top and bottom shielding are provided around the signal conductors with electrical interconnection between the shielding via the fold.
It is a further object of the present invention to produce flat flexible transmission cable in which the characteristic impedance of the line as well as other associated electrical transmission properties can easily be controlled by the pitch and/or period of the ground conductor and signal conductor.
It is a still further object of the present invention to produce continuous flat flexible transmission cable which can be terminated at virtually any point along the line thereby eliminating the previously known termination window in the cable element and the need for separate art work and separate production for each individual length of cable while maintaining electrical integrity throughout the length of the line up to and possibly including the termination thereof.
It is still another object of the present invention to produce continuous flat flexible transmission cable in which a plurality of termination pads are formed on signal and ground conductors at regularly spaced intervals, with the termination pads decreasing the effective resistance of the line and thus reducing the attenuation while maintaining electrical integrity throughout the length of the line.
It is still another object of the present invention to produce continuous flat flexible transmission cable having a plurality of periodically spaced termination pads in both the signal and ground conductors, which pads serve to add series inductance along the line thus increasing the characteristic impedance over parallel conductor designs of similar dimensions. The periodic termination pads additionally provide greater effective skin conductor areas to reduce attenuation effects over the parallel conductor designs of similar dimensions.
The foregoing objects and other advantages will be apparent to those skilled in the art from the following detailed description taken with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a first embodiment of the subject flat flexible transmission cable before being folded to form a shielded line;
FIG. 2 is a plan view of the first embodiment of FIG. 1 showing the subject cable in the finished folded condition;
FIG. 3 is a vertical transverse section through the subject cable taken along line 3-3 of FIG. 2;
FIG. 4 is a plan view of a second embodiment of the subject invention showing multiple signal lines and multiple ground lines;
FIG. 5 is a plan view of a third embodiment of the present invention;
FIG. 6 is a perspective view of a fourth embodiment of the present invention;
FIG. 7 is a transverse vertical section taken along line 7-7 in FIG. 6 and showing the fourth embodiment cable after being folded; and
FIG. 8 is a transverse vertical section, similar to FIG. 7, schematically illustrating a fifth embodiment with interconnection of the top and bottom ground conductors through the odd numbered signal conductors to form a series of completely shielded transmission lines.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the subject flat flexible transmission cable is intended for use in high density wiring situations where it is desirable to provide controlled characteristic impedance with adequate electrical shielding and having signal rise times in the nanosecond region. In this embodiment a flat flexible dielec tric substrate 10 has a signal conductor 12 formed on one side and a ground conductor 14 formed on the opposite side. Both the signal and ground conductors can be formed by any of the well known printing and etching techniques. The cable is formed with the signal conductor laterally offset from the longitudinal axis of the cable and the ground conductor is formed with a regularly meandering pattern, in this instance a zig-zag configuration. The pattern of the ground conductor is such that it covers substantially the entire width of the cable. The cable is cut transversely at points 16, near the terminal pads 18 and 20 of the signal and ground conductors, respectively, and the portion of the cable between the cuts is folded upon itself, as shown in FIGS. 2 and 3. The folded cable is fixed in the folded condition by any appropriate means, such as by known adhesives. Terminal connector 22 and 24 are attached to the signal and ground conductor pads 18 and 20, respectively, either from opposite directions, as shown in FIG. 2, or from the same side of the transmission cable. Examples of suitable crimped on terminal connectors may be found in US. Pat. Nos. 3,395,381; 3,553,836; 3,663,922; and 3,697,925. However, soldered or any other type of terminal connector may be used. The characteristic impedance of the folded transmission line is determined by the wave length or the pitch of the ground line as well as the thickness and dielectric properties of the substrate. This foldover concept can also be utilized with a plurality of conductors, as will be discussed with reference to the fourth and fifth embodiments, since the problem of critical alignment of parallel shields is obviated.
The second embodiment of the subject invention is shown in FIG. 4. In this embodiment the flexible dielectric substrate 26 has a plurality of substantially parallel signal transmission conductors 28 formed on one side thereof with each of the signal conductors having formed thereon a plurality of periodically spaced pads 30 which are suitable for terminations purposes. A plurality of substantially parallel ground conductors 32 are formed on the opposite side of the substrate 26 with pads 34 formed therealong in spaced relationship. It should be noted that the number of ground conductors exceeds the number of transmission conductors by one so that the transversely outermost conductor always is a ground conductor. At least one conductor 36 interconnects all of the ground conductors 32, preferably at each pad 34. Additional ground pads 38 are formed on the laterally outside ground conductors in substantial alignment with the pads 30 of the signal conductors. As in the previous embodiment, the flexible substrate may be of any well known dielectric material, such as Mylar, and the circuits may be formed thereon by any of the well known printing and etching techniques.
The pattern of the signal and transmission conductors of this embodiment is formed by a plurality of interlocking ground and signal pads. The pads are alternated from between the top and bottom layers so that an insulation displacement crimp can be affected on any pad without disturbing the opposite conductor layer. Termination of each conductor is possible at spaced intervals along the cable with ground pads 38 making it possible for conventional (not matched impedance) connectors to be fixed to the cable in line. Individual ground connections can be made with ground pads 34 for matched impedance connector schemes.
The rectangular pads of the strip line conductors also provide a small series inductance at each interval which acts to increase the normal characteristic impedance without increasing the slot width between signal and ground conductors. The electrical characteristics of this design are comparable to known parallel conductor cables. The impedance is controlled by adjusting the signal and ground pad and conductor proximity. As mentioned before, the disclosed cable can be terminated using any of the well known flat flexible cable connectors, such as those crimp connectors mentioned in the above listed patents as well as soldered on connectors.
The third embodiment of the present invention is shown in FIG. 5. In this embodiment the flexible dielectric substrate 40 has a signal conductor 42 formed on one side with a plurality of termination pads 44 periodically spaced therealong. The opposite side of the substrate has a ground line formed thereon which includes a pair of parallel spaced conductors 46 provided with periodically spaced, terminal pads 48 and 50, respectively, and interconnected by a plurality of parallel spaced conductors 52. As with the previous embodiments, the signal and ground conductors can be formed on the substrate by any of the well known and previously discussed techniques. This embodiment of the subject cable has controlled electrical transmission properties throughout its length including the termination areas. This embodiment is also suitable for matched impedance connectors and can be made in either a folded configuration, similar to the first embodiment, or multi-line configuration, similar to the second embodiment.
The fourth embodiment, see FIGS. 6 and 7, differs from the previous embodiments in that the flexible insulator substrate 54 has a plurality of parallel spaced signal conductors 56 formed on one side and two separate ground conductors 58 and 60 formed on the opposite side. The signal conductors are transversely offset with respect to the cable but aligned with one of the ground conductors, the ground conductors being symmetrical with respect to the cable. The cable is folded and secured in the folded condition in the same manner as the first embodiment discussed above. The ground conductors in this embodiment can be interconnected by terminal connectors (not shown).
The fifth embodiment, see FIG. 8, has a folded flexible insulator substrate 62 having a plurality of signal conductors 64 and two ground conductors 66 and 68. Every other signal conductor is connected to both ground conductors by means 70 to form a series of transmission lines similar, in many respects, to coaxial cable. The connection of the conductors may be effected by anyone of a number of known means including spot bonding, stapling, stitching with metallic wire, etc.
The ground conductors 58 and 60, for ease of illustration only, have been shown in FIG. 6 with a sawtooth pattern that would have the ground conductors in phase in the folded condition of the cable. It should be understood that other patterns, both in and out of phase with one another, are also suitable for use in the subject cable. The primary requirement of the ground line pattern is that it must extend past the outer most edges of the transmission lines.
Experimentation with samples of cable produced according to the present invention have shown that it has improved electrical transmission characteristics. The subject cable displayed improved cross-talk characteristics, for both cable to cable and channel to channel cross-talk, while providing reduced high frequency attenuation and stable characteristic impedance. The subject cable also has many advantages over the known prior art in manufacturing since there is a reduced amount of art work required and special cable processing for separate applications is eliminated.
Part of the characteristic impedance of the subject cable is directly related to the thickness of the dielectric material between the signal and ground conductors. To enable high impedance within the design limit is thus a major development concern particularly for the folded embodiments. Increases slot width in the ground plane, as a means of increasing the characteristic impedance, also increases the cable to cable crosstalk. Reduced signal conductor width and thickness serves to increase the impedance while reduction of the thickness dimension will increase the high frequency attenuation. Any discontinuities in the signal or ground patterns for purposes of termination result in altered electrical characteristics which generally degrade cable performance.
The design requirements for the subject cable dictate geometric patterns for the signal and ground conductor which provide high characteristics impedance with minimum thickness of the dielectric material between the signal and ground conductor layers. Cross-talk and high frequency attenuation must also be kept to within acceptable limits. The pattern shown in the accompanying drawings are designed to introduce series inductance within the lines as a possible means of increasing the typical characteristic impedance. The periodic rectangular pads in each line act as small series inductances. Thus impedance is increased by adding inductive reactance rather than the usual method of decreasing the capacitance. This technique maintains the cross-talk values at approximately the same level while achieving higher characteristic impedances. The design also provides for reduced high frequency attenuation of the signal line by increasing the overall effective surface area of the conductors. Finally the pads can also serve as termination areas providing for the previously discussed continuous termination feature.
In order to provide flat flexible cable performance approaching that of coaxial cable, it is anticipated that the folded configuration will be required. This concept introduces a problem of electrical connection of the upper and lower ground shields. One method of interconnecting incorporates a fold over of the ground layer as illustrated in the first embodiment. The folded approach introduces problems of alignment of the signal and ground patterns on conventional parallel line (slot) cables. However, the zig-zag, general cross bar or transverse mesh patterns alleviate this problem of pattern alignment and provides for better cable to cable crosstalk characteristics than the standard slot design. The characteristic impedance of the line is controlled by adjustment of the ground pattern pitch. The characteristic impedance parameter can thus be determined within the ground pattern alone so that the alignment between the ground and signal pattern is no longer of critical importance. Moreover this approach provides a greater portion of the shielding directly over and under the signal conductors where it is most needed rather than to the sides of the signal conductors where radiation is relatively small.
The present invention may be subject to many variations and modifications without departing from the spirit or essential characteristics thereof. The present embodiments should therefore be considered in all respects as merely illustrative and not restrictive of the scope of the invention.
What is claimed is:
1. An improved flexible flat cable with at least one shielded transmission line comprising:
a flat flexible insulating substrate;
at least one signal conductor formed on one side of said substrate, said at least one signal conductor being transversely offset with respect to the longitudinal axis of said cable; and
at least one ground conductor formed on the opposite side of said substrate, said at least one ground conductor having a regular meandering configuration covering substantially the entire width of said cable;
each of said signal and said ground conductors having a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable,
said cable being folded upon itself between the end most termination pads whereby said at least one signal conductor is shielded on at least two sides by electrically connected ground lines.
2. A flat flexible cable according to claim 1 wherein said meandering pattern is a zig-zag configuration.
3. A flat flexible cable according to claim 1 wherein said meandering pattern is a sinusoidal configuration.
4. A flat flexible cable according to claim 1 wherein said at least one ground conductor includes a pair of conductors each following the same regular meandering pattern but being out of phase with respect to each other.
5. A flat flexible cable according to claim 1 wherein said at least one ground conductor comprises a pair of spaced ground conductors, further comprising a plurality of conductors interconnecting said spaced conductors.
6. An improved flexible flat cable with at least one shielded transmission line comprising:
a flat flexible insulating substrate;
a plurality of substantially parallel, spaced conductors formed on one side of said substrate;
a plurality of substantially parallel, spaced ground conductors formed on the opposide side of said substrate, said plurality of ground conductors exceeding said plurality of signal conductors by one, said ground and said signal conductors being transversely offset with respect to each other whereby each said signal conductor lies between two ground conductors;
each of said signal and said ground conductors havin g a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut .to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable.
A flat flexible cable according to claim 6 further comprising:
conductor means interconnecting each of said plurality of ground conductors.
8. A flat flexible cable according to claim 6 wherein respective ones of said termination of pads of each said signal conductor are in substantial transverse alignment, and
respective ones of said termination pads of each said ground conductor are in substantial transverse alignment.
9. A flat flexible cable according to claim 8 wherein each row of transversely aligned termination pads said ground conductors are longitudinally offset from each row of transversely aligned termination pads of said signal conductors.
10. A flat flexible cable according to claim 9 further comprising a plurality of additiona termination pads formed on each of the laterally exterior ground donductors, said additional termination pads being transversely aligned with but spaced outwardly of the responsive rows of transversely aligned termination pads of said signal conductors.
11. A flat flexible cable according to claim 10 wherein connectors are attached to the end most aligned row of signal conductor termination pads and additional termination pads of said ground lines thereby providing an unmatched impedance connection for said cable.
12. A flat flexible cable having at least one transmission line comprising:
a flat flexible insulator substrate; plurality of transmission line signal conductors formed on one side of said substrate, each said signal conductors having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each signal conductor being in substantial transverse alignment across said cable,
a plurality of ground conductors formed on the opposite side of said substrate, each ground conductor having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each ground conductor being positioned in substantial transverse alignment across said cable and longitudinally between the termination pads of said signal conductors whereby constant specific characteristic impedance throughout the length of the cable is achieved.
13. A flat flexible transmission cable according to claim 12 further comprising a plurality of conductors interconnecting each of said plurality of ground conductors.
14. A flat flexible transmission cable according to claim 12 further comprising an additional termination pad formed on each of the transversely exterior ground conductors, said additional termination pads being in longitudinal alignment with but transversely spaced outwardly from respective rows of termination pads of said signal conductors thereby providing unmatched impedance termination for said cable.
15. A flat flexible transmission cable according to claim 12 wherein said cable is terminated by matched impedance connectors fixed to the end most pads of said signal and ground conductors.
16. A flat flexible cable according to claim 12 wherein said plurality of ground conductors includes at least two conductors,
said signal conductors being offset with respect to the longitudinal axis of said cable, I
said cable being folded upon itself between the end most termination pads whereby each said signal conductor is shielded by ground conductors on at least two sides.
17. A flat flexible cable according to claim 16 further comprising a plurality of conductors interconnecting each of said ground conductors.
18. A flat flexible cable according to claim 16 further comprising a plurality of conductor means interconnecting said ground conductors and the odd numbered signal conductors through said substrate whereby said flat flexible cable simulates a plurality of coaxial cables.

Claims (18)

1. An improved flexible flat cable with at least one shielded transmission line comprising: a flat flexible insulating substrate; at least one signal conductor formed on one side of said substrate, said at least one signal conductor being transversely offset with respect to the longitudinal axis of said cable; and at least one ground conductor formed on the opposite side of said substrate, said at least one ground conductor having a regular meandering configuration covering substantially the entire width of said cable; each of said signal and said ground conductors having a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable, said cable being folded upon itself between the end most termination pads whereby said at least one signal conductor is shielded on at least two sides by electrically connected ground lines.
2. A flat flexible cable according to claim 1 wherein said meandering pattern is a zig-zag configuration.
3. A flat flexible cable according to claim 1 wherein said meandering pattern is a sinusoidal configuration.
4. A flat flexible cable according to claim 1 wherein said at least one ground conductor includes a pair of conductors each following the same regular meandering pattern but being out of phase with respect to each other.
5. A flat flexible cable according to claim 1 wherein said at least one ground conductor comprises a pair of spaced ground conductors, further comprising a plurality of conductors interconnecting said spaced conductors.
6. An improved flexible flat cable with at least one shielded transmission line comprising: a flat flexible insulating substrate; a plurality of substantially parallel, spaced conductors formed on one side of said substrate; a plurality of substantially parallel, spaced ground conductors formed on the opposide side of said substrate, said plurality of ground conductors exceeding said plurality of signal conductors by one, said ground and said signal conductors being transversely offset with respect to each other whereby each said signal conductor lies between two ground conductors; each of said signal and said ground conductors having a plurality of termination pads regularly spaced along the length thereof whereby said cable may be produced in great length, cut to discrete lengths and terminated by attachment of appropriate connectors to the end most pads while maintaining continuous electrical characteristics throughout the length of the cable.
7. A flat flexible cable according to claim 6 further comprising: conductor means interconnecting each of said plurality of ground conductors.
8. A flat flexible cable according to claim 6 wherein respective ones of said termination of pads of each said signal conductor are in substantial transverse alignment, and respective ones of said termination pads of each said ground conductor are in substantial transverse alignment.
9. A flat flexible cable according to claim 8 wherein each row of transversely aligned termination pads said ground conductors are longitudinally offset from each row of transversely aligned termination pads of said signal conductors.
10. A flat flexible cable according to claim 9 further comprising a plurality of additional termination pads formed on each of the laterally exterior ground donductors, said additional termination pads being transversely aligned with but spaced outwardly of the responsive rows of transversely aligned termination pads of said signal conductors.
11. A flat flexible cable according to claim 10 wherein connectors are attached to the end most aligned row of signal conductor termination pads and additional termination pads of said ground lines thereby providing an unmatched impedance connection for said cable.
12. A flat flexible cable having at least one transmission line comprising: a flat flexible insulator substrate; plurality of transmission line signal conductors formed on one side of said substrate, each said signal conductors having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each signal conductor being in substantial transverse alignment across said cable, a plurality of ground conductors formed on the opposite side of said substrate, each ground conductor having a plurality of enlarged termination pads formed therealong at regularly spaced intervals, the respective termination pads of each ground conductor being positioned in substantial transverse alignment across said cable and longitudinally between the termination pads of said signal conductors whereby constant specific characteristic impedance throughout the length of the cable is achieved.
13. A flat flexible transmission cable according to claim 12 further comprising a plurality of conductors interconnecting each of said plurality of ground conductors.
14. A flat flexible transmission cable according to claim 12 further comprising an additional termination pad formed on each of the transversely exterior ground conductors, said additional termination pads being in longitudinal alignment with but transversely spaced outwardly from respective rows of termination pads of said signal conductors thereby providing unmatched impedance termination for said cable.
15. A flat flexible transmission cable according to claim 12 wherein said cable is terminated by matched impedance connectors fixed to the end most pads of said signal and ground conductors.
16. A flat flexible cable according to claim 12 wherein said plurality of ground conductors includes at least two conductors, said signal conductors being offset with respect to the longitudinal axis of said cable, said cable being folded upon itself between the end most termination pads whereby each said signal conductor is shielded by ground conductors on at least two sides.
17. A flat flexible cable according to claim 16 further comprising a plurality of conductors interconnecting each of said ground conductors.
18. A flat flexible cable according to claim 16 further comprising a plurality of conductor means interconnecting said ground conductors and the odd numbered signal conductors through said substrate whereby said flat flexible cable simulates a plurality of coaxial cables.
US390813A 1973-08-23 1973-08-23 Flat flexible transmission cable Expired - Lifetime US3876964A (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
US390813A US3876964A (en) 1973-08-23 1973-08-23 Flat flexible transmission cable
CA206,457A CA1002132A (en) 1973-08-23 1974-08-07 Flat flexible cable
NL7410660A NL7410660A (en) 1973-08-23 1974-08-08 FLAT BENDING CABLE.
GB3518774A GB1468862A (en) 1973-08-23 1974-08-09 Flexible cable
ES429225A ES429225A1 (en) 1973-08-23 1974-08-13 Flat flexible transmission cable
IT26340/74A IT1019969B (en) 1973-08-23 1974-08-14 FLAT FLEXIBLE CABLE
AR255220A AR200091A1 (en) 1973-08-23 1974-08-16 FLAT FLEXIBLE CABLE FOR A TRANSMISSION LINE
BR6883/74A BR7406883D0 (en) 1973-08-23 1974-08-20 CHATO FLEXIBLE CABLE
DE2439853A DE2439853C2 (en) 1973-08-23 1974-08-20 Electric ribbon cable
SE7410624A SE397148B (en) 1973-08-23 1974-08-21 ELECTRICAL TRANSMISSION OR TRANSMISSION CABLE
BE147804A BE819067A (en) 1973-08-23 1974-08-21 TRANSMISSION LINE FLAT FLEXIBLE CABLE
AT684574A AT333868B (en) 1973-08-23 1974-08-22 ELECTRIC FLAT CABLE
FR7428835A FR2241854B1 (en) 1973-08-23 1974-08-22
JP49096940A JPS5840284B2 (en) 1973-08-23 1974-08-23 Transmission cable
AT987675A AT341598B (en) 1973-08-23 1975-12-29 ELECTRIC TRANSMISSION CABLE
CA254,493A CA1006929A (en) 1973-08-23 1976-06-10 Flat flexible cable
SE7613682A SE427883B (en) 1973-08-23 1976-12-06 ELECTRIC TRANSMISSION OR TRANSMISSION CABLE
AT380477A AT347524B (en) 1973-08-23 1977-05-27 ELECTRIC TRANSMISSION CABLE
HK191/79A HK19179A (en) 1973-08-23 1979-03-29 Flexible cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US390813A US3876964A (en) 1973-08-23 1973-08-23 Flat flexible transmission cable

Publications (1)

Publication Number Publication Date
US3876964A true US3876964A (en) 1975-04-08

Family

ID=23544045

Family Applications (1)

Application Number Title Priority Date Filing Date
US390813A Expired - Lifetime US3876964A (en) 1973-08-23 1973-08-23 Flat flexible transmission cable

Country Status (15)

Country Link
US (1) US3876964A (en)
JP (1) JPS5840284B2 (en)
AR (1) AR200091A1 (en)
AT (1) AT333868B (en)
BE (1) BE819067A (en)
BR (1) BR7406883D0 (en)
CA (1) CA1002132A (en)
DE (1) DE2439853C2 (en)
ES (1) ES429225A1 (en)
FR (1) FR2241854B1 (en)
GB (1) GB1468862A (en)
HK (1) HK19179A (en)
IT (1) IT1019969B (en)
NL (1) NL7410660A (en)
SE (2) SE397148B (en)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130723A (en) * 1976-11-19 1978-12-19 The Solartron Electronic Group Limited Printed circuit with laterally displaced ground and signal conductor tracks
US4596141A (en) * 1984-02-29 1986-06-24 Kabushiki Kaisha Tsuchiya Seisakusho Electrically operated oil level gauge
US4680557A (en) * 1985-04-22 1987-07-14 Tektronix, Inc. Staggered ground-plane microstrip transmission line
US4785135A (en) * 1987-07-13 1988-11-15 International Business Machines Corporation De-coupled printed circuits
US5134252A (en) * 1990-01-21 1992-07-28 Sony Corporation Signal line
US5238006A (en) * 1991-06-24 1993-08-24 Medtronic, Inc. Apnea stimulation lead
US5262590A (en) * 1992-04-27 1993-11-16 Sheldahl, Inc. Impedance controlled flexible circuits with fold-over shields
US5398689A (en) * 1993-06-16 1995-03-21 Hewlett-Packard Company Ultrasonic probe assembly and cable therefor
US5408050A (en) * 1992-04-16 1995-04-18 Honda Tsushin Kogyo Co., Ltd. Flat cable and method of making the same
US5552565A (en) * 1995-03-31 1996-09-03 Hewlett-Packard Company Multiconductor shielded transducer cable
US5554825A (en) * 1994-11-14 1996-09-10 The Whitaker Corporation Flexible cable with a shield and a ground conductor
US5556300A (en) * 1994-11-14 1996-09-17 The Whitaker Corporation End connection for a flexible shielded cable conductor
US5571164A (en) * 1994-09-29 1996-11-05 Pacesetter Ab Cardiac electrode device having at least a portion thereof which is ribbon shaped
US5594214A (en) * 1995-01-20 1997-01-14 Acer Peripherals, Inc. Signal transmission flat cable
US5811727A (en) * 1995-10-16 1998-09-22 Lo; Jeffrey In-line coupler
US5917149A (en) * 1997-05-15 1999-06-29 Daimlerchrysler Corporation Flexible circuit board interconnect with strain relief
US5924873A (en) * 1997-05-15 1999-07-20 Chrysler Corporation Flexible circuit board interconnect with strain relief
US5981870A (en) * 1997-05-15 1999-11-09 Chrysler Corporation Flexible circuit board interconnect with strain relief
US6132236A (en) * 1999-05-14 2000-10-17 Methode Electronics, Inc. Flex cable termination apparatus and termination method
US6218631B1 (en) * 1998-05-13 2001-04-17 International Business Machines Corporation Structure for reducing cross-talk in VLSI circuits and method of making same using filled channels to minimize cross-talk
US20050083152A1 (en) * 2003-10-17 2005-04-21 Jimmy Hsu Signal transmission structure
US20060208355A1 (en) * 2005-03-21 2006-09-21 Mahadevan Suryakumar Routing configuration for high frequency signals in an integrated circuit package
US20060254814A1 (en) * 2003-07-21 2006-11-16 Bouryi Sze Ground shield structure
US20070099483A1 (en) * 2005-10-28 2007-05-03 Chicony Electronics Co. Ltd Flexible circuit board
US20070257502A1 (en) * 2004-07-02 2007-11-08 Takashi Imai Interior Material Structure for Vehicle
US20090236126A1 (en) * 2006-08-29 2009-09-24 Seiichiro Miyahara Flexible Wiring Board
US20100188826A1 (en) * 2008-03-10 2010-07-29 Shih-Kun Yeh Connector device
US8844537B1 (en) 2010-10-13 2014-09-30 Michael T. Abramson System and method for alleviating sleep apnea
US20150213924A1 (en) * 2014-01-28 2015-07-30 Wei Sun Chang Flexible flat cable
US20170280554A1 (en) * 2015-08-06 2017-09-28 Nippon Mektron, Ltd. Multilayer flexible printed circuit board and method of manufacturing the same
WO2018022687A1 (en) * 2016-07-28 2018-02-01 Qualcomm Incorporated Circuits and methods providing electronic band gap (ebg) structures at memory module electrical coupling
US10930410B1 (en) * 2019-11-12 2021-02-23 Dell Products L.P. Flat flexible cable with bonded ground wires and method for forming same
WO2021133028A1 (en) 2019-12-24 2021-07-01 Samsung Electronics Co., Ltd. Circuit board and electronic device including circuit board
KR20230029750A (en) * 2020-07-01 2023-03-03 인터내셔널 비지네스 머신즈 코포레이션 Periodic Transmission Line Cable Filtering

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1534014A (en) * 1975-10-16 1978-11-29 Xerox Corp Electrical cable and coupling arrangement
FR2530874A1 (en) * 1982-07-20 1984-01-27 Jaeger Anti-interference flexible electrical connection device.
GB2166603B (en) * 1984-09-28 1988-07-20 Yazaki Corp Electrical harness
US4644092A (en) * 1985-07-18 1987-02-17 Amp Incorporated Shielded flexible cable
FR2613539A1 (en) * 1987-04-03 1988-10-07 Bull Sa Impedance-matched bus connector and method of manufacturing such a connector
US20040094324A1 (en) * 2002-11-18 2004-05-20 Barr Andrew Harvey Cable systems and related methods
CN108492930B (en) * 2018-03-15 2023-08-25 上海电气集团腾恩驰科技(苏州)有限公司 A steering wheel set
CN110475423A (en) * 2019-08-22 2019-11-19 星河电路（福建）有限公司 A kind of structure and machining method that local high-frequency is inlayed with FR-4

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1307995A (en) * 1919-06-24 Mghtsotg-arresteb
US1999137A (en) * 1926-08-10 1935-04-23 Frank L Walker Radio apparatus
US2963535A (en) * 1957-12-16 1960-12-06 Sanders Associates Inc Shielded printed circuit electrical component
US3173111A (en) * 1961-05-24 1965-03-09 Heinz E Kallmann Delay line
US3226473A (en) * 1963-03-04 1965-12-28 Sanders Associates Inc Encapsulated conductive paths with readily removable insulation
US3398232A (en) * 1965-10-19 1968-08-20 Amp Inc Circuit board with interconnected signal conductors and interconnected shielding conductors
US3609600A (en) * 1967-11-27 1971-09-28 Gen Electric Information Syste Distributed parameters delay line,on folded support

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935014C (en) * 1953-09-01 1955-11-10 Siemens Ag Asymmetrical microwave flat cable
GB1315907A (en) * 1970-12-17 1973-05-09 Amp Inc Flat cables
DE2154814A1 (en) * 1971-11-04 1973-05-10 Telefonbau & Normalzeit Gmbh LADDER ARRANGEMENT FOR CONNECTING ASSEMBLIES

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1307995A (en) * 1919-06-24 Mghtsotg-arresteb
US1999137A (en) * 1926-08-10 1935-04-23 Frank L Walker Radio apparatus
US2963535A (en) * 1957-12-16 1960-12-06 Sanders Associates Inc Shielded printed circuit electrical component
US3173111A (en) * 1961-05-24 1965-03-09 Heinz E Kallmann Delay line
US3226473A (en) * 1963-03-04 1965-12-28 Sanders Associates Inc Encapsulated conductive paths with readily removable insulation
US3398232A (en) * 1965-10-19 1968-08-20 Amp Inc Circuit board with interconnected signal conductors and interconnected shielding conductors
US3609600A (en) * 1967-11-27 1971-09-28 Gen Electric Information Syste Distributed parameters delay line,on folded support

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130723A (en) * 1976-11-19 1978-12-19 The Solartron Electronic Group Limited Printed circuit with laterally displaced ground and signal conductor tracks
US4596141A (en) * 1984-02-29 1986-06-24 Kabushiki Kaisha Tsuchiya Seisakusho Electrically operated oil level gauge
US4680557A (en) * 1985-04-22 1987-07-14 Tektronix, Inc. Staggered ground-plane microstrip transmission line
US4785135A (en) * 1987-07-13 1988-11-15 International Business Machines Corporation De-coupled printed circuits
US5134252A (en) * 1990-01-21 1992-07-28 Sony Corporation Signal line
US5238006A (en) * 1991-06-24 1993-08-24 Medtronic, Inc. Apnea stimulation lead
US5408050A (en) * 1992-04-16 1995-04-18 Honda Tsushin Kogyo Co., Ltd. Flat cable and method of making the same
US5262590A (en) * 1992-04-27 1993-11-16 Sheldahl, Inc. Impedance controlled flexible circuits with fold-over shields
US5398689A (en) * 1993-06-16 1995-03-21 Hewlett-Packard Company Ultrasonic probe assembly and cable therefor
US5571164A (en) * 1994-09-29 1996-11-05 Pacesetter Ab Cardiac electrode device having at least a portion thereof which is ribbon shaped
US5554825A (en) * 1994-11-14 1996-09-10 The Whitaker Corporation Flexible cable with a shield and a ground conductor
US5556300A (en) * 1994-11-14 1996-09-17 The Whitaker Corporation End connection for a flexible shielded cable conductor
US5594214A (en) * 1995-01-20 1997-01-14 Acer Peripherals, Inc. Signal transmission flat cable
US5552565A (en) * 1995-03-31 1996-09-03 Hewlett-Packard Company Multiconductor shielded transducer cable
US5811727A (en) * 1995-10-16 1998-09-22 Lo; Jeffrey In-line coupler
US5924873A (en) * 1997-05-15 1999-07-20 Chrysler Corporation Flexible circuit board interconnect with strain relief
US5917149A (en) * 1997-05-15 1999-06-29 Daimlerchrysler Corporation Flexible circuit board interconnect with strain relief
US5981870A (en) * 1997-05-15 1999-11-09 Chrysler Corporation Flexible circuit board interconnect with strain relief
US6218631B1 (en) * 1998-05-13 2001-04-17 International Business Machines Corporation Structure for reducing cross-talk in VLSI circuits and method of making same using filled channels to minimize cross-talk
US6132236A (en) * 1999-05-14 2000-10-17 Methode Electronics, Inc. Flex cable termination apparatus and termination method
US20060254814A1 (en) * 2003-07-21 2006-11-16 Bouryi Sze Ground shield structure
US20050083152A1 (en) * 2003-10-17 2005-04-21 Jimmy Hsu Signal transmission structure
US7106145B2 (en) * 2003-10-17 2006-09-12 Via Technologies, Inc. Signal transmission structure having salients aligned with non-reference regions
US20070257502A1 (en) * 2004-07-02 2007-11-08 Takashi Imai Interior Material Structure for Vehicle
US7569947B2 (en) * 2004-07-02 2009-08-04 Toyota Jidosha Kabushiki Kaisha Interior material structure for vehicle
US20060208355A1 (en) * 2005-03-21 2006-09-21 Mahadevan Suryakumar Routing configuration for high frequency signals in an integrated circuit package
US7586192B2 (en) * 2005-03-21 2009-09-08 Intel Corporation Routing configuration for high frequency signals in an integrated circuit package
US7291037B2 (en) * 2005-10-28 2007-11-06 Chicony Electronics Co. Ltd Flexible circuit board
US20070099483A1 (en) * 2005-10-28 2007-05-03 Chicony Electronics Co. Ltd Flexible circuit board
US20090236126A1 (en) * 2006-08-29 2009-09-24 Seiichiro Miyahara Flexible Wiring Board
US8242373B2 (en) * 2006-08-29 2012-08-14 Nippon Mektron, Ltd. Flexible wiring board with characteristic impedance control circuit
US20100188826A1 (en) * 2008-03-10 2010-07-29 Shih-Kun Yeh Connector device
US9763767B2 (en) 2010-10-13 2017-09-19 Michael T. Abramson System and method for alleviating sleep apnea
US8844537B1 (en) 2010-10-13 2014-09-30 Michael T. Abramson System and method for alleviating sleep apnea
US20150213924A1 (en) * 2014-01-28 2015-07-30 Wei Sun Chang Flexible flat cable
US20170280554A1 (en) * 2015-08-06 2017-09-28 Nippon Mektron, Ltd. Multilayer flexible printed circuit board and method of manufacturing the same
US9883584B2 (en) * 2015-08-06 2018-01-30 Nippon Mektron, Ltd. Method of manufacturing a multilayer flexible printed circuit board
WO2018022687A1 (en) * 2016-07-28 2018-02-01 Qualcomm Incorporated Circuits and methods providing electronic band gap (ebg) structures at memory module electrical coupling
US10349513B2 (en) 2016-07-28 2019-07-09 Qualcomm Incorporated Circuits and methods providing electronic band gap (EBG) structures at memory module electrical coupling
US10930410B1 (en) * 2019-11-12 2021-02-23 Dell Products L.P. Flat flexible cable with bonded ground wires and method for forming same
WO2021133028A1 (en) 2019-12-24 2021-07-01 Samsung Electronics Co., Ltd. Circuit board and electronic device including circuit board
US12200864B2 (en) 2019-12-24 2025-01-14 Samsung Electronics Co., Ltd. Circuit board and electronic device including circuit board including a first and second plurality of ground patterns
KR20230029750A (en) * 2020-07-01 2023-03-03 인터내셔널 비지네스 머신즈 코포레이션 Periodic Transmission Line Cable Filtering
CN115769684A (en) * 2020-07-01 2023-03-07 国际商业机器公司 Periodic Transmission Line Cable Filtering

Also Published As

Publication number Publication date
ATA684574A (en) 1976-04-15
ES429225A1 (en) 1976-08-16
CA1002132A (en) 1976-12-21
DE2439853A1 (en) 1975-03-06
FR2241854B1 (en) 1981-04-17
SE7410624L (en) 1975-02-24
SE7613682L (en) 1976-12-06
AR200091A1 (en) 1974-10-15
JPS5050680A (en) 1975-05-07
FR2241854A1 (en) 1975-03-21
SE397148B (en) 1977-10-17
NL7410660A (en) 1975-02-25
DE2439853C2 (en) 1984-05-17
GB1468862A (en) 1977-03-30
IT1019969B (en) 1977-11-30
HK19179A (en) 1979-04-06
BE819067A (en) 1975-02-21
JPS5840284B2 (en) 1983-09-05
BR7406883D0 (en) 1975-06-17
AT333868B (en) 1976-12-10
SE427883B (en) 1983-05-09

Similar Documents

Publication Publication Date Title
JPS5840284B2 (en) Transmission cable
US4707671A (en) Electrical transmission line
FI59308B (en) FLEXIBEL FLATBANDKABEL
US20020157865A1 (en) Flexible flat circuitry with improved shielding
US5334800A (en) Flexible shielded circuit board
US5084594A (en) Multiwire cable
US3459879A (en) Flexible multiflat conductor characteristic impedance cable
US4287385A (en) Shielded flat cable
CN102870169B (en) Connector arrangement for shielded cables
KR100283508B1 (en) Non-solid reference plane with bidirectional impedance control
US3818117A (en) Low attenuation flat flexible cable
US3703604A (en) Flat conductor transmission cable
US4680423A (en) High performance flat cable
JPH0766998B2 (en) Printed circuit panel
EP0697804B1 (en) Printed circuit board for plug connector
JPS61247101A (en) Microstrip transmission line
US4731031A (en) Transmission cable connector having a contoured shell
NL8002404A (en) HIGH-FREQUENCY CONNECTION CLAMP FOR PCBS.
US3914531A (en) Power isolated transmission cable assembly
JP2003031033A (en) Flexible flat cable
EP0204446A2 (en) Electrical transmission line
JPH0653703A (en) Connecting structure of strip line
US3205295A (en) Electrical connector
JP2603022Y2 (en) Printed circuit board transmission line
US4570136A (en) Electromagnetic delay line