US3757028A - Terference printed board and similar transmission line structure for reducing in - Google Patents
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- US3757028A US3757028A US00289871A US3757028DA US3757028A US 3757028 A US3757028 A US 3757028A US 00289871 A US00289871 A US 00289871A US 3757028D A US3757028D A US 3757028DA US 3757028 A US3757028 A US 3757028A
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- 230000005540 biological transmission Effects 0.000 title claims description 29
- 239000004020 conductor Substances 0.000 claims abstract description 81
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000001629 suppression Effects 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000007747 plating Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 235000002754 Acer pseudoplatanus Nutrition 0.000 description 1
- 240000004731 Acer pseudoplatanus Species 0.000 description 1
- 235000006485 Platanus occidentalis Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Images
Classifications
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- 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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0039—Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
-
- 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
-
- 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
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0228—Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors
-
- 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
-
- 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
- H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
-
- 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
- H05K2201/09245—Crossing 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
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/097—Alternating conductors, e.g. alternating different shaped pads, twisted pairs; Alternating components
Definitions
- ABSTRACT A novel transmission-line structure, particularly adapted for printed circuit sheets and the like, and embodying zig-zag line conductors formed of conductive strips successively disposed on opposite sides of the insulating sheet and interconnected transversely through the sheet, with the corresponding strips of each line conductor crossing those of the other line conductor, through on opposite sides of said sheet, effectively to provide a twist of the line conductors through at least a turn to efiect magnetic field cancellation, selfshielding and interference suppression.
- the present invention relates to transmission-line structures for printed boards and the like, being more particularly directed to structures designed for reducing electromagnetic interference in electronic and other equipment employing printed, etched or other wiring, secured upon insulating surfaces by automatic printing, etching, stamping or other methods.
- shielding of critical transmission paths has conventionally been performed in a number of ways. If electromagnetic waveguides are employed, forexample, containing electromagnetic energy within them, interference from outside sources entering the guides is completely prevented by the guide walls. Coaxial cables have also been used to conduct signal energy along a central conductor which is shielded from outside influences by an outer metallic sheath, constructed in a variety of ways, and which is also used as a return conductor. If a lesser degree of shielding from outside influences is tolerable, other transmission lines, including twisted pairs of wires, have been used; wherein magnetic fields impinging on such pairs of wires induce pposing voltages in different portions of the twisted pair. Since these portions are adjacent to one other and repeat at regular alternate intervals, fairly effective shielding against electromagnetic intereference has been thus obtained.
- An object of the present invention accordingly, is to provide a novel conductor printed circuit transmission line structure that produces and is minimally sensitive to electromagnetic and electrostatic radiation.
- a further object of the invention is to provide a novel printed circuit transmission line somewhat analagous to a twisted or braided conductor pattern in performance. Still a further object is to provide a novel transmission line or more general utility, as well, and having minimal mutual interference characteristics.
- the invention contemplates a transmission line structure carried by an insulating sheet, having, in combination with the said sheet, a pair of zig-zag transmission line conductors each comprising a plurality of conductive strips successively disposed on opposite sides of said sheet and interconnected by conductive means extending transversely through said sheet; input and output terminal means correspondingly provided at the strips at opposite ends of the line conductors; and the line conductors being disposed such that the corresponding strips of each line conductor cross those of the other line conductor, though on opposite sides of said sheet, effectively to provide a twist of the transmission line conductors though at least a turn to effect magnetic field cancellation, self-shielding, and interference suppression.
- FIG. 1 of which is a top view of a two-conductor transmission line constructed in accordance with a preferred embodiment of the invention
- FIG. 2 is an isometric view, upon an enlarged scale of part of the line of FIG. 1;
- FIGS. 3, 4 and 5 are schematic views similar to FIG. 1 of modifications of the conductor patterns.
- a source S of electric sig nals is shown at input terminals 1' and 35 connected, respectively to first conductor strips 1 and 35 disposed on the top surface of a supporting insulating sheet I.
- Each of the conductor strips 1 and 35 is the first of a plurality of strips (59-l317 and 31-27-23-19) respectively comprising substantially equal-length segments of such a pair of transmission lines.
- the current passing through each conductor strip'(such as the strip 1) is fed transversely through the sheet I to the next successive strip (5) by through-connectors (3).
- Such through-connectors'as 3, 7, 11, etc. may take various forms, such as a metallic insert of rolled or seamless eyeletform, wire, or a plated connection, such as a plated-through hole.
- Successive strips l-5-9l3-l7 (and 35-3l-27-2319) are disposed on opposite sides of the insulating sheet I and arranged in zig-zag fashion such that corresponding strips of each line (5 and 35, 9 and 31, 13 and 27, and 17 and 23) cross one another, but insulatingly, on opposite sides of the sheet 1.
- Connections transversely between opposite sides of the printed circuit board, as at 3, can be reliably accomplished by plating conductive material (such as copper) on the inside wall of holes drilled or punched through the printed circuit board, as at 3, can be reliably accomplished by plating conductive material (such'as copper) on the inside wall of holes drilled or punched through the printed circuit board, permitting a multitude of reliable connections to be made from one side of the printed circuit board to the other and thereby obviating the need for soldering manually all connections to the top of the printed circuit board.
- Such through-connections can thus be used as a useful interconnecting of circuit elements, rather than as an undesirable and to-be-avoided connection, as in the prior art.
- the current from the left-hand terminal of source S is next passed along bottom surface conductor 5.
- the current is then conducted via through-connector 7 to top surface conductor 9; then by through-connector 11, to bottom surface conductor 13; by through-connector 15, to top surface conductor 17, etc.; and ultimately to the lefthand terminal of load resistance L, which may be any desired utilization means.
- the energy from source S is thus conducted to load L via a pair of conductors which have experienced a right-hand zig-zag twist of two complete turns, although the actual conductor portions are located on the flat surfaces of insulating medium I and in transverse electric connections passing through the board medium I.
- An electric current passed from source S to load L would normally generate a magnetic field perpendicular to the plane of insulator board I, this field being proportional to the product of the current and the area II formed by the portions of, for example, conductors 5, 9, 31, and 35 enclosing it. If the structure described above were constructed symmetrically, a magnetic field of the same magnitude, but opposite polarity, would be created by the same current in area III formed by the portions of conductors 9, 13, 27, and 31 enclosing it. These two opposing magnetic fields would cancel each other at a distance large compared to the dimension of a full twist, and show a substantial reduction in field strength (compared to the field of a single area) at closer distances. In essence, the effective twisting of the conductors has shielded the transmission line.
- the product of length of the conductor portions and the thickness of the insulating medium I form the relative areas.
- transmission lines of printed circuit construction have been restricted to those configurations which did not involve crossing of conductors via connections through the insulating medium and were practically restricted to parallel conductor construction. In such cases, interference reduction could only be accomplished by having the conductors as narrow as possible and the insulating medium as thin as possible.
- the present invention aside from being quite noncritical as to thickness or strength of insulating medium or conductor thickness, is also very tolerant of any misalignment between the top-surface and the bottomsurface conductors. This may be seen by imagining the bottom-surface conductors all being displaced to one side. The size of the areas II and III would not be changed, though the through-connections would no longer fall on the center of the bottom conductors.
- FIGS. 1 and 2 The conductor construction of FIGS. 1 and 2 is illustrated for a transmission line of relatively low capacitance. If a lower impedance is desired, this can be achieved by having a higher proportion of the conductors located on top of each other. This is schematically represented in FIG. 3 where the solid lines indicate topsurface conductors, dashed lines indicate bottomsurface conductors, and dots represent the throughconnections.
- the conductor segments here have straight intermedate sections between oppositely extending crossing portions, forming somewhat Z-shape conductor segments.
- each transmission line is twisted or transposed at a different pitch compared to its neighbors.
- FIG. 4 shows schematically in which four transmission lines are schematically shown, with the first or left-hand transmission line experiencing three complete turns; the second, two complete turns; the third, one and one-half turns; and the fourth, one turn in the length shown.
- This type of zig-zag construction may be made to any desired length and with any number of conductors, limited only by the fabrication facilities.
- the present invention readily allows twisting of any multiple number of conductors, as schematically shown in FIG. 5 for the case of a four-conductor transmission line cable.
- Conductors A, B, C, and D are twisted about each other for one full turn, while auxiliary conductors E and F, carrying non-critical currents, have been allowed to pass between the top spaces between the conductors.
- the lengths of the conductor segments in this embodiment may thus be different for the successive segments.
- the technique described above is not, however, restricted to twisted multiple conductors, but may with equal ease be applied to conductor configurations of a braided or woven shape, now possible only with individual wire conductors.
- the invention is not restricted to rigid printed circuit applications, but may be used with flexible, thin insulating films as well.
- the invention furthermore, is not restricted to conductors and through-connectors made by conventional etching and plating methods, but is usable with constructions made by other suitable processes, including those involving diffusion processes or vacuum deposition processes. Further modifications will also occur to those skilled in the art, and all such are considered to fall within the spirit and scope of the invention as defined in the appended claims.
- a transmission line structure carried by an insulating sheet having in combination with the said sheet, a pair of zig-zag transmission line conductors each comprising a plurality of conductive strips successively disposed on opposite sides of said sheet and interconnected by conductive means extending transversely through said sheet; input and output terminal means correspondingly provided at the strips at opposite ends of the line conductors; and the line conductors being disposed such that the corresponding strips of each line conductor cross those of the other line conductor, though on opposite sides of said sheet, effectively to conductive strips of a plurality of different lengths.
Abstract
A novel transmission-line structure, particularly adapted for printed circuit sheets and the like, and embodying zig-zag line conductors formed of conductive strips successively disposed on opposite sides of the insulating sheet and interconnected transversely through the sheet, with the corresponding strips of each line conductor crossing those of the other line conductor, through on opposite sides of said sheet, effectively to provide a twist of the line conductors through at least a turn to effect magnetic field cancellation, self-shielding and interference suppression.
Description
ilnited States Patent 1 1 Schlessel 1451 Sept. 4, 1973 1 1 PRINTED-BOARD AND SIMILAR TRANSMISSION-LINE STRUCTURE FOR REDUCING INTERFERENE [76] Inventor: Joseph Schlessel, 7A Sycamore Dr.,
Great Neck, NY. 11021 [22] Filed: Sept. 18, I972 121 App]. No.1 289,871
[52] US. Cl 174/33, 174/34, 174/68.5, 174/117 FF, 333/99 R [51] Int. Cl H011) 11/02, 1101b 7/08 [58] Field of Search 174/32, 33, 34, 117 R, 174/117 F, 117 FF, 68.5; 333/99 R, 81 A, 73 S 156] References Cited UNITED STATES PATENTS 2,754,484 7/1956 Adams 174/33 X 3,091,655 5/1963 Ruiter 174/32 3,033,970 5/1962 Eisler 174/117 FF X 2,857,450 10/1958 Oliver 174/34 3,587,169 6/1971 Bcnke et al...... 174/34 X 1,792,273 2/1931 Byk et a1 174/34 Primary Examiner-Bernard A. Gilheany Assistant ExaminerA. T. Grimley Att0rneyRines & Rines [5 7] ABSTRACT A novel transmission-line structure, particularly adapted for printed circuit sheets and the like, and embodying zig-zag line conductors formed of conductive strips successively disposed on opposite sides of the insulating sheet and interconnected transversely through the sheet, with the corresponding strips of each line conductor crossing those of the other line conductor, through on opposite sides of said sheet, effectively to provide a twist of the line conductors through at least a turn to efiect magnetic field cancellation, selfshielding and interference suppression.
4 Claims, 5 Drawing Figures PRINTED-BOARD AND SIMILAR TRANSMISSION-LINE STRUCTURE FOR REDUCING INTERFERENCE The present invention relates to transmission-line structures for printed boards and the like, being more particularly directed to structures designed for reducing electromagnetic interference in electronic and other equipment employing printed, etched or other wiring, secured upon insulating surfaces by automatic printing, etching, stamping or other methods.
In conventional hand-wired electronic equipments, shielding of critical transmission paths has conventionally been performed in a number of ways. If electromagnetic waveguides are employed, forexample, containing electromagnetic energy within them, interference from outside sources entering the guides is completely prevented by the guide walls. Coaxial cables have also been used to conduct signal energy along a central conductor which is shielded from outside influences by an outer metallic sheath, constructed in a variety of ways, and which is also used as a return conductor. If a lesser degree of shielding from outside influences is tolerable, other transmission lines, including twisted pairs of wires, have been used; wherein magnetic fields impinging on such pairs of wires induce pposing voltages in different portions of the twisted pair. Since these portions are adjacent to one other and repeat at regular alternate intervals, fairly effective shielding against electromagnetic intereference has been thus obtained.
Since all of the above transmission-line structures, however, have embodied the use of separate wires and cables connected between each of the sources and loads, their use to reduce interference effects in printed wiring circuits and the like has generally not been attempted for several reasons. First, the conductor pattern on a printed circuit board can only be applied to oneor both of the two surfaces of the insulating board material, with the conductors applied as a single or fewlayered surface deposit. Secondly, if two-sided printed circuits are used, the connections between the two sides have been deliberately restricted to as few as possible, the boards being typically soldered on the bottom surface only, using a dipping process or an automatic machine having a solder wave. Reliable connections to the top of the board, indeed, are achievable, in practice, only by additional manual soldering to the top (or component side) of the printed circuit board. Consequently, multi-conductor circuits having minimal radiation characteristics have not heretofore been considered as feasible in these types of constructions.
Instead, other shielding approaches have been proposed, including multiple layer and conductor constructions for reducing interference in printed board circuits as described, for example, in U.S. Letters Patent No. 3,460,105; actual ground and interposed insulating strips and shields as described, for example, in U.S. Letters Patent No. 2,754,484; and multi-parallelconductor laminates, as described, for example, in U.S. Letters Patent No. 3,118,016. Such proposals, however, disadvantageously all require extra or ancillary layers and/or conductors and are not thus adapted for ordinary single printed board use and the like.
In accordance with a discovery underlying the present invention, however, it has been found that a novel zig-zag, alternating opposite-side conduction strip transmission line can be provided upon even single insulating boards and the like so as inherently to reduce radiation interference along the line.
An object of the present invention, accordingly, is to provide a novel conductor printed circuit transmission line structure that produces and is minimally sensitive to electromagnetic and electrostatic radiation.
A further object of the invention is to provide a novel printed circuit transmission line somewhat analagous to a twisted or braided conductor pattern in performance. Still a further object is to provide a novel transmission line or more general utility, as well, and having minimal mutual interference characteristics.
Other and further objects are later described, being 'more fully pointed out in the appended claims. In summary, however, from one of its broad aspects, the invention contemplates a transmission line structure carried by an insulating sheet, having, in combination with the said sheet, a pair of zig-zag transmission line conductors each comprising a plurality of conductive strips successively disposed on opposite sides of said sheet and interconnected by conductive means extending transversely through said sheet; input and output terminal means correspondingly provided at the strips at opposite ends of the line conductors; and the line conductors being disposed such that the corresponding strips of each line conductor cross those of the other line conductor, though on opposite sides of said sheet, effectively to provide a twist of the transmission line conductors though at least a turn to effect magnetic field cancellation, self-shielding, and interference suppression.
The invention will now be described with reference to the accompanying drawings,
FIG. 1 of which is a top view of a two-conductor transmission line constructed in accordance with a preferred embodiment of the invention;
FIG. 2 is an isometric view, upon an enlarged scale of part of the line of FIG. 1; and
FIGS. 3, 4 and 5 are schematic views similar to FIG. 1 of modifications of the conductor patterns.
Referring to FIGS. 1 and 2, a source S of electric sig nals is shown at input terminals 1' and 35 connected, respectively to first conductor strips 1 and 35 disposed on the top surface of a supporting insulating sheet I. Each of the conductor strips 1 and 35 is the first of a plurality of strips (59-l317 and 31-27-23-19) respectively comprising substantially equal-length segments of such a pair of transmission lines. The current passing through each conductor strip'(such as the strip 1) is fed transversely through the sheet I to the next successive strip (5) by through-connectors (3). Such through-connectors'as 3, 7, 11, etc., may take various forms, such as a metallic insert of rolled or seamless eyeletform, wire, or a plated connection, such as a plated-through hole. Successive strips l-5-9l3-l7 (and 35-3l-27-2319) are disposed on opposite sides of the insulating sheet I and arranged in zig-zag fashion such that corresponding strips of each line (5 and 35, 9 and 31, 13 and 27, and 17 and 23) cross one another, but insulatingly, on opposite sides of the sheet 1. Connections transversely between opposite sides of the printed circuit board, as at 3, can be reliably accomplished by plating conductive material (such as copper) on the inside wall of holes drilled or punched through the printed circuit board, as at 3, can be reliably accomplished by plating conductive material (such'as copper) on the inside wall of holes drilled or punched through the printed circuit board, permitting a multitude of reliable connections to be made from one side of the printed circuit board to the other and thereby obviating the need for soldering manually all connections to the top of the printed circuit board. Such through-connections can thus be used as a useful interconnecting of circuit elements, rather than as an undesirable and to-be-avoided connection, as in the prior art.
Tracing the current from the source S, after passing through transverse through-connector 3, the current from the left-hand terminal of source S is next passed along bottom surface conductor 5. The current is then conducted via through-connector 7 to top surface conductor 9; then by through-connector 11, to bottom surface conductor 13; by through-connector 15, to top surface conductor 17, etc.; and ultimately to the lefthand terminal of load resistance L, which may be any desired utilization means.
Current from the right-hand terminal of load resistance L is returned to the right-hand terminal of source S via top surface conductor 19, through-connector 21 bottom surface conductor 23, through-connector 25, top surface conductor 27, through-connector 29, bottom surface conductor 31, through-connector 33, and top surface conductor 35, FIG. 2.
In essence, the energy from source S is thus conducted to load L via a pair of conductors which have experienced a right-hand zig-zag twist of two complete turns, although the actual conductor portions are located on the flat surfaces of insulating medium I and in transverse electric connections passing through the board medium I.
An electric current passed from source S to load L would normally generate a magnetic field perpendicular to the plane of insulator board I, this field being proportional to the product of the current and the area II formed by the portions of, for example, conductors 5, 9, 31, and 35 enclosing it. If the structure described above were constructed symmetrically, a magnetic field of the same magnitude, but opposite polarity, would be created by the same current in area III formed by the portions of conductors 9, 13, 27, and 31 enclosing it. These two opposing magnetic fields would cancel each other at a distance large compared to the dimension of a full twist, and show a substantial reduction in field strength (compared to the field of a single area) at closer distances. In essence, the effective twisting of the conductors has shielded the transmission line.
The same analysis can be made and the same result can be achieved for fields in the left-right direction. Here, the product of length of the conductor portions and the thickness of the insulating medium I form the relative areas.
By reciprocity, the strength of the induced voltage due to an external alternating magnetic field is proportional to the magnetic field generated by the conducted current. Consequently, such a transmission line shows little susceptibility to interference from external fields.
Heretofore, transmission lines of printed circuit construction have been restricted to those configurations which did not involve crossing of conductors via connections through the insulating medium and were practically restricted to parallel conductor construction. In such cases, interference reduction could only be accomplished by having the conductors as narrow as possible and the insulating medium as thin as possible. It
can readily be appreciated that this prior-art construction is severly limited in both physical strength and the transmission lines power-handling capability, while demanding high precision in its construction.
The present invention, aside from being quite noncritical as to thickness or strength of insulating medium or conductor thickness, is also very tolerant of any misalignment between the top-surface and the bottomsurface conductors. This may be seen by imagining the bottom-surface conductors all being displaced to one side. The size of the areas II and III would not be changed, though the through-connections would no longer fall on the center of the bottom conductors.
The conductor construction of FIGS. 1 and 2 is illustrated for a transmission line of relatively low capacitance. If a lower impedance is desired, this can be achieved by having a higher proportion of the conductors located on top of each other. This is schematically represented in FIG. 3 where the solid lines indicate topsurface conductors, dashed lines indicate bottomsurface conductors, and dots represent the throughconnections. The conductor segments here have straight intermedate sections between oppositely extending crossing portions, forming somewhat Z-shape conductor segments.
In applications where a multitude of transmission lines must operate in close proximity, each carrying different signals and being susceptible to interference from signals in the other transmission lines, a construction may be effected in accordance with the invention in which each transmission line is twisted or transposed at a different pitch compared to its neighbors. This is shown schematically in FIG. 4, with the same symbol notations as FIG. 3. Here, four transmission lines are schematically shown, with the first or left-hand transmission line experiencing three complete turns; the second, two complete turns; the third, one and one-half turns; and the fourth, one turn in the length shown. This type of zig-zag construction may be made to any desired length and with any number of conductors, limited only by the fabrication facilities.
In certain applications, moreover, it is sometimes desired to have transmission lines of more than two conductors. The present invention readily allows twisting of any multiple number of conductors, as schematically shown in FIG. 5 for the case of a four-conductor transmission line cable. Conductors A, B, C, and D are twisted about each other for one full turn, while auxiliary conductors E and F, carrying non-critical currents, have been allowed to pass between the top spaces between the conductors. The lengths of the conductor segments in this embodiment may thus be different for the successive segments.
The technique described above is not, however, restricted to twisted multiple conductors, but may with equal ease be applied to conductor configurations of a braided or woven shape, now possible only with individual wire conductors. Similarly, the invention is not restricted to rigid printed circuit applications, but may be used with flexible, thin insulating films as well. The invention, furthermore, is not restricted to conductors and through-connectors made by conventional etching and plating methods, but is usable with constructions made by other suitable processes, including those involving diffusion processes or vacuum deposition processes. Further modifications will also occur to those skilled in the art, and all such are considered to fall within the spirit and scope of the invention as defined in the appended claims.
What is claimed is:
l. A transmission line structure carried by an insulating sheet, having in combination with the said sheet, a pair of zig-zag transmission line conductors each comprising a plurality of conductive strips successively disposed on opposite sides of said sheet and interconnected by conductive means extending transversely through said sheet; input and output terminal means correspondingly provided at the strips at opposite ends of the line conductors; and the line conductors being disposed such that the corresponding strips of each line conductor cross those of the other line conductor, though on opposite sides of said sheet, effectively to conductive strips of a plurality of different lengths.
IF l l
Claims (4)
1. A transmission line structure carried by an insulating sheet, having in combination with the said sheet, a pair of zig-zag transmission line conductors each comprising a plurality of conductive strips successively disposed on opposite sides of said sheet and interconnected by conductive means extending transversely through said sheet; input and output terminal means correspondingly provided at the strips at opposite ends of the line conductors; and the line conductors being disposed such that the corresponding strips of each line conductor cross those of the other line conductor, though on opposite sides of said sheet, effectively to provide a twist of thE transmission line conductors through at least a turn to effect magnetic field cancellation, self-shielding, and interference suppression.
2. A transmission-line structure as claimed in claim 1 and in which said zig-zag configuration comprises a plurality of substantially equal-length successive conductive strips.
3. A transmission-line structure as claimed in claim 1 and in which said zig-zag configuration comprises conductive strips each of substantially Z-shape.
4. A transmission-line structure as claimed in claim 1 and in which said zig-zag configuration comprises conductive strips of a plurality of different lengths.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US28987172A | 1972-09-18 | 1972-09-18 |
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US3757028A true US3757028A (en) | 1973-09-04 |
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US00289871A Expired - Lifetime US3757028A (en) | 1972-09-18 | 1972-09-18 | Terference printed board and similar transmission line structure for reducing in |
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Cited By (77)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4362899A (en) * | 1979-10-05 | 1982-12-07 | University College London | Printed circuit board |
DE3210998A1 (en) * | 1982-03-25 | 1983-10-06 | Hartmann Karlheinz Elektronic | Printed-circuit board |
FR2538190A1 (en) * | 1982-12-20 | 1984-06-22 | Victor Company Of Japan | EIGHT-FIXED CONFIGURATION INPUT CIRCUIT FOR AN AMPLIFIER |
DE3326800A1 (en) * | 1983-07-26 | 1985-02-14 | ANT Nachrichtentechnik GmbH, 7150 Backnang | PCB |
EP0262780A1 (en) * | 1986-08-25 | 1988-04-06 | AT&T Corp. | Marching interconnecting lines in semiconductor integrated circuits |
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US20050180053A1 (en) * | 2004-02-18 | 2005-08-18 | Headway Technologies, Inc. | Cross talk and EME minimizing suspension design |
US6951978B1 (en) * | 2002-12-30 | 2005-10-04 | Richard S. Norman | Conductive fabric with balanced mutual interference amongst conductors |
US20060092929A1 (en) * | 2004-10-28 | 2006-05-04 | Samsung Electronics Co., Ltd. | Interwoven clock transmission lines and devices employing the same |
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US20070272851A1 (en) * | 2005-07-19 | 2007-11-29 | Iero Demetrio P | Device for modifying and/or rebalancing ionisation for an electrical load |
US20070277997A1 (en) * | 2006-06-01 | 2007-12-06 | Wei-An Liang | Substrate and layout method |
EP1865757A1 (en) * | 2006-06-06 | 2007-12-12 | Alcatel Lucent | Reduced crosstalk in printed circuit boards by twisting tracks |
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US20090270007A1 (en) * | 2008-04-23 | 2009-10-29 | Samsung Electronics Co., Ltd. | Method of manufacturing liquid crystal display |
USRE41311E1 (en) | 1992-02-24 | 2010-05-04 | Commscope, Inc. Of North America | High frequency electrical connector |
US20100200276A1 (en) * | 2009-02-11 | 2010-08-12 | Broadcom Corporation | Implementations of twisted differential pairs on a circuit board |
US20100307798A1 (en) * | 2009-06-03 | 2010-12-09 | Izadian Jamal S | Unified scalable high speed interconnects technologies |
US20110109416A1 (en) * | 2009-11-12 | 2011-05-12 | Innocom Technology (Shenzhen) Co., Ltd. | Inductor of circuit board |
EP2338205A1 (en) * | 2008-10-17 | 2011-06-29 | Hewlett-Packard Development Company, L.P. | Transmission line circuit having pairs of crossing conductive lines |
DE102012206330A1 (en) | 2012-04-17 | 2013-10-17 | Lisa Dräxlmaier GmbH | Twisted wires by printing technology |
US20140341581A1 (en) * | 2013-05-15 | 2014-11-20 | Fujitsu Semiconductor Limited | Isolating differential transmission lines |
JP2015149118A (en) * | 2015-05-28 | 2015-08-20 | 大日本印刷株式会社 | Method for manufacturing flexure substrate for suspension |
JP2016092405A (en) * | 2014-11-04 | 2016-05-23 | キヤノン株式会社 | Printed circuit board, printed wiring board, and differential transmission circuit |
US20170133778A1 (en) * | 2013-05-09 | 2017-05-11 | Commscope, Inc. Of North Carolina | High data rate connectors and cable assemblies that are suitable for harsh environments and related methods and systems |
US20170164528A1 (en) * | 2015-12-07 | 2017-06-08 | Sumitomo Wiring Systems, Ltd. | Protector |
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US11109483B2 (en) * | 2017-12-06 | 2021-08-31 | Samsung Electronics Co., Ltd. | Circuit board and electronic device including same |
DE102021005774A1 (en) | 2020-12-17 | 2022-06-23 | Sew-Eurodrive Gmbh & Co Kg | Printed circuit board, in particular printed circuit board that can be used as a primary conductor |
-
1972
- 1972-09-18 US US00289871A patent/US3757028A/en not_active Expired - Lifetime
Cited By (122)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4362899A (en) * | 1979-10-05 | 1982-12-07 | University College London | Printed circuit board |
DE3210998A1 (en) * | 1982-03-25 | 1983-10-06 | Hartmann Karlheinz Elektronic | Printed-circuit board |
FR2538190A1 (en) * | 1982-12-20 | 1984-06-22 | Victor Company Of Japan | EIGHT-FIXED CONFIGURATION INPUT CIRCUIT FOR AN AMPLIFIER |
DE3326800A1 (en) * | 1983-07-26 | 1985-02-14 | ANT Nachrichtentechnik GmbH, 7150 Backnang | PCB |
EP0262780A1 (en) * | 1986-08-25 | 1988-04-06 | AT&T Corp. | Marching interconnecting lines in semiconductor integrated circuits |
US4891616A (en) * | 1988-06-01 | 1990-01-02 | Honeywell Inc. | Parallel planar signal transmission system |
WO1990002477A1 (en) * | 1988-08-16 | 1990-03-08 | Brunswick Corporation | Apparatus and method for protecting engine electronics from radio frequency interference |
US5248854A (en) * | 1989-04-05 | 1993-09-28 | Nec Corporation | Multilevel metallization for vlsi and method for forming the same |
US5039824A (en) * | 1989-05-30 | 1991-08-13 | Graphico Co., Ltd. | Printed circuit having twisted conductor lines printed thereon |
EP0400885A1 (en) * | 1989-05-30 | 1990-12-05 | Graphico Co. Ltd. | Printed circuit having twisted conductor lines printed thereon |
EP0403288A2 (en) * | 1989-06-15 | 1990-12-19 | Graphico Co. Ltd. | Bus structure |
AU625190B2 (en) * | 1989-06-15 | 1992-07-02 | Graphico Co., Ltd. | Radial type of parallel system bus structure with printed, twisted conductor lines |
EP0403288A3 (en) * | 1989-06-15 | 1991-05-22 | Graphico Co. Ltd. | Bus structure |
US5036160A (en) * | 1989-11-07 | 1991-07-30 | Crosspoint Systems, Inc. | Twisted pair backplane |
USRE41311E1 (en) | 1992-02-24 | 2010-05-04 | Commscope, Inc. Of North America | High frequency electrical connector |
US5310363A (en) * | 1992-03-23 | 1994-05-10 | Superior Modular Products Incorporated | Impedance matched reduced cross talk electrical connector system |
US5399107A (en) * | 1992-08-20 | 1995-03-21 | Hubbell Incorporated | Modular jack with enhanced crosstalk performance |
US5414393A (en) * | 1992-08-20 | 1995-05-09 | Hubbell Incorporated | Telecommunication connector with feedback |
US5673009A (en) * | 1992-08-20 | 1997-09-30 | Hubbell Incorporated | Connector for communication systems with cancelled crosstalk |
US5432484A (en) * | 1992-08-20 | 1995-07-11 | Hubbell Incorporated | Connector for communication systems with cancelled crosstalk |
US6132266A (en) * | 1992-08-20 | 2000-10-17 | Hubbell Incorporated | Method of reducing crosstalk in connector for communication system |
US5334271A (en) * | 1992-10-05 | 1994-08-02 | W. L. Gore & Associates, Inc. | Process for manufacture of twisted pair electrical cables having conductors of equal length |
US5397861A (en) * | 1992-10-21 | 1995-03-14 | Mupac Corporation | Electrical interconnection board |
US5474474A (en) * | 1992-12-18 | 1995-12-12 | The Siemon Company | Electrically balanced connector assembly |
US5295869A (en) * | 1992-12-18 | 1994-03-22 | The Siemon Company | Electrically balanced connector assembly |
US5435752A (en) * | 1992-12-18 | 1995-07-25 | The Siemon Company | Electrically balanced connector assembly |
US5362254A (en) * | 1992-12-18 | 1994-11-08 | The Siemon Company | Electrically balanced connector assembly |
US6758698B1 (en) | 1992-12-23 | 2004-07-06 | Panduit Corp. | Communication connector with capacitor label |
EP0633632A2 (en) * | 1993-07-08 | 1995-01-11 | The Whitaker Corporation | Communications connector terminal arrays having noise cancelling capabilities |
EP0633632A3 (en) * | 1993-07-08 | 1996-07-03 | Whitaker Corp | Communications connector terminal arrays having noise cancelling capabilities. |
WO1995006945A1 (en) * | 1993-08-31 | 1995-03-09 | Motorola, Inc. | A vertically twisted-pair planar conductor line structure |
WO1995006955A1 (en) * | 1993-08-31 | 1995-03-09 | Motorola, Inc. | A twisted-pair planar conductor line off-set structure |
US5430247A (en) * | 1993-08-31 | 1995-07-04 | Motorola, Inc. | Twisted-pair planar conductor line off-set structure |
US5389735A (en) * | 1993-08-31 | 1995-02-14 | Motorola, Inc. | Vertically twisted-pair planar conductor line structure |
US5459643A (en) * | 1993-09-30 | 1995-10-17 | The Siemon Company | Electrically enhanced wiring block with break test capability |
US5470244A (en) * | 1993-10-05 | 1995-11-28 | Thomas & Betts Corporation | Electrical connector having reduced cross-talk |
US5454738A (en) * | 1993-10-05 | 1995-10-03 | Thomas & Betts Corporation | Electrical connector having reduced cross-talk |
US5504273A (en) * | 1993-10-25 | 1996-04-02 | Sumitomo Wiring Systems, Ltd. | Fixing means for flat circuit units and the flat circuit units used therefor |
EP0650318A1 (en) * | 1993-10-25 | 1995-04-26 | Sumitomo Wiring Systems, Ltd. | Fixing means for flat circuit units and the flat circuit units used therefor |
US5431586A (en) * | 1993-12-21 | 1995-07-11 | Hubbell Incorporated | Electrical connector with modular nose |
US5357051A (en) * | 1994-01-31 | 1994-10-18 | Hwang Richard H | Printed circuit board for reducing radio frequency interferences |
US5424490A (en) * | 1994-02-25 | 1995-06-13 | Sony Electronics Inc. | Twisted lead pairs on PCB to improve common mode rejection |
US5835979A (en) * | 1994-06-02 | 1998-11-10 | Fujitsu Limited | Wiring pattern preventing EMI radiation |
US5844783A (en) * | 1994-07-21 | 1998-12-01 | The Whitaker Corporation | Flexible printed circuit harness device and flexible printed circuit used thereof |
USD382274S (en) * | 1995-11-22 | 1997-08-12 | The Siemon Company | Gravity feed telecommunications connector |
US5791943A (en) * | 1995-11-22 | 1998-08-11 | The Siemon Company | Reduced crosstalk modular outlet |
US5769647A (en) * | 1995-11-22 | 1998-06-23 | The Siemon Company | Modular outlet employing a door assembly |
US6017229A (en) * | 1995-11-22 | 2000-01-25 | The Siemon Company | Modular outlet employing a door assembly |
US5646368A (en) * | 1995-11-30 | 1997-07-08 | International Business Machines Corporation | Printed circuit board with an integrated twisted pair conductor |
US5805382A (en) * | 1996-06-21 | 1998-09-08 | International Business Machines Corporation | Integrated conductor magnetic recording head and suspension having cross-over integrated circuits for noise reduction |
WO1998020485A1 (en) * | 1996-11-06 | 1998-05-14 | Quantum Corporation | Head suspension with self-shielding 'twisted' integrated conductor trace array |
US5944535A (en) * | 1997-02-04 | 1999-08-31 | Hubbell Incorporated | Interface panel system for networks |
US5931703A (en) * | 1997-02-04 | 1999-08-03 | Hubbell Incorporated | Low crosstalk noise connector for telecommunication systems |
US5871655A (en) * | 1998-03-19 | 1999-02-16 | International Business Machines Corporation | Integrated conductor magnetic recording head and suspension having cross-over integrated circuits for noise reduction |
US6231397B1 (en) | 1998-04-16 | 2001-05-15 | Thomas & Betts International, Inc. | Crosstalk reducing electrical jack and plug connector |
US6089923A (en) * | 1999-08-20 | 2000-07-18 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
US6428362B1 (en) | 1999-08-20 | 2002-08-06 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
USRE41052E1 (en) | 1999-08-20 | 2009-12-22 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
USRE44961E1 (en) | 1999-08-20 | 2014-06-24 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
USRE43366E1 (en) | 1999-08-20 | 2012-05-08 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
USRE39546E1 (en) * | 1999-08-20 | 2007-04-03 | Adc Telecommunications, Inc. | Jack including crosstalk compensation for printed circuit board |
US6348651B1 (en) * | 2000-03-27 | 2002-02-19 | Hon Hai Precision Ind. Co., Ltd. | Twist pattern to improve electrical performances of twisted-pair cable |
GB2369727A (en) * | 2000-09-11 | 2002-06-05 | Hewlett Packard Co | Reducing radio frequency interference from signal lines on a PCB |
GB2369727B (en) * | 2000-09-11 | 2004-05-19 | Hewlett Packard Co | Printed circuit board and method for reducing radio frequency interference emissions from conductive traces on a printed circuit board |
US6433272B1 (en) * | 2000-09-19 | 2002-08-13 | Storage Technology Corporation | Crosstalk reduction in constrained wiring assemblies |
EP1235469A3 (en) * | 2001-02-27 | 2004-03-31 | Hewlett Packard Company, a Delaware Corporation | Circuit board construction for differential bus distribution |
EP1235469A2 (en) * | 2001-02-27 | 2002-08-28 | Hewlett Packard Company, a Delaware Corporation | Circuit board construction for differential bus distribution |
US6744329B2 (en) | 2001-12-14 | 2004-06-01 | Yazaki North America, Inc. | Cross talk compensation circuit |
US6816025B2 (en) | 2001-12-14 | 2004-11-09 | Yazaki North America, Inc. | Cross talk compensation circuit |
US20030112087A1 (en) * | 2001-12-14 | 2003-06-19 | Nguyen Hung Thai | Cross talk compensation circuit |
US7109819B2 (en) * | 2002-06-10 | 2006-09-19 | Schleifring Und Apparatebau Gmbh | Device for wideband electrical connection of two units that are movable relative to each other |
US20050168299A1 (en) * | 2002-06-10 | 2005-08-04 | Harry Schilling | Device for wideband electrical connection of two units that are movable relative to each other |
US6951978B1 (en) * | 2002-12-30 | 2005-10-04 | Richard S. Norman | Conductive fabric with balanced mutual interference amongst conductors |
US6916996B2 (en) * | 2003-06-23 | 2005-07-12 | Realtek Semiconductor Corp. | Symmetric electrical connection system |
US20040256149A1 (en) * | 2003-06-23 | 2004-12-23 | Chi-Kung Kuan | Symmetric electrical connection system |
US20050180053A1 (en) * | 2004-02-18 | 2005-08-18 | Headway Technologies, Inc. | Cross talk and EME minimizing suspension design |
EP1735929A1 (en) * | 2004-04-12 | 2006-12-27 | Sony Ericsson Mobile Communications AB | Wireless communications devices including circuit substrates with partially overlapping conductors thereon coupling power to/from power amplifier systems |
US20060092929A1 (en) * | 2004-10-28 | 2006-05-04 | Samsung Electronics Co., Ltd. | Interwoven clock transmission lines and devices employing the same |
US20060172614A1 (en) * | 2005-02-03 | 2006-08-03 | Ta Sang H | Universal systems printed circuit blocks and method for interconnecting the same |
US7375979B2 (en) * | 2005-03-25 | 2008-05-20 | Motorola, Inc. | Method and apparatus for routing a differential pair on a printed circuit board |
US20060215375A1 (en) * | 2005-03-25 | 2006-09-28 | Burhance Gary R | Method and apparatus for routing a differential pair on a printed circuit board |
US20070272851A1 (en) * | 2005-07-19 | 2007-11-29 | Iero Demetrio P | Device for modifying and/or rebalancing ionisation for an electrical load |
US7884451B2 (en) | 2005-07-22 | 2011-02-08 | Marvell World Trade Ltd. | Packaging for high speed integrated circuits |
US20070018305A1 (en) * | 2005-07-22 | 2007-01-25 | Sehat Sutardja | Packaging for high speed integrated circuits |
US20070018288A1 (en) * | 2005-07-22 | 2007-01-25 | Sehat Sutardja | Packaging for high speed integrated circuits |
US20070018292A1 (en) * | 2005-07-22 | 2007-01-25 | Sehat Sutardja | Packaging for high speed integrated circuits |
US7638870B2 (en) * | 2005-07-22 | 2009-12-29 | Marvell International Ltd. | Packaging for high speed integrated circuits |
US20070138626A1 (en) * | 2005-12-21 | 2007-06-21 | Knighten James L | Crossing conductive traces in a pcb |
US7652364B2 (en) * | 2005-12-21 | 2010-01-26 | Teradata Us, Inc. | Crossing conductive traces in a PCB |
US20070277997A1 (en) * | 2006-06-01 | 2007-12-06 | Wei-An Liang | Substrate and layout method |
EP1865757A1 (en) * | 2006-06-06 | 2007-12-12 | Alcatel Lucent | Reduced crosstalk in printed circuit boards by twisting tracks |
US7868727B2 (en) * | 2007-08-14 | 2011-01-11 | Industrial Technology Research Institute | Inter-helix inductor devices |
US20110063067A1 (en) * | 2007-08-14 | 2011-03-17 | Industrial Technology Research Institute | Inter-Helix Inductor Devices |
US20090045904A1 (en) * | 2007-08-14 | 2009-02-19 | Industrial Technology Research Institute | Inter-helix inductor devices |
US8441332B2 (en) * | 2007-08-14 | 2013-05-14 | Industrial Technology Research Institute | Inter-helix inductor devices |
US8071890B2 (en) * | 2007-10-26 | 2011-12-06 | Industrial Technology Research Institute | Electrically conductive structure of circuit board and circuit board using the same |
US20090107717A1 (en) * | 2007-10-26 | 2009-04-30 | Industrial Technology Research Institute | Electrically conductive structure of circuit board and circuit board using the same |
EP2068391A2 (en) * | 2007-12-04 | 2009-06-10 | Rohde & Schwarz GmbH & Co. KG | Device with crossed strip lines |
US20090270007A1 (en) * | 2008-04-23 | 2009-10-29 | Samsung Electronics Co., Ltd. | Method of manufacturing liquid crystal display |
US20110205715A1 (en) * | 2008-10-17 | 2011-08-25 | Poorman Paul W | Transmission line circuit having pairs of crossing conductive lines |
EP2338205A4 (en) * | 2008-10-17 | 2012-04-11 | Hewlett Packard Development Co | Transmission line circuit having pairs of crossing conductive lines |
EP2338205A1 (en) * | 2008-10-17 | 2011-06-29 | Hewlett-Packard Development Company, L.P. | Transmission line circuit having pairs of crossing conductive lines |
US20100200276A1 (en) * | 2009-02-11 | 2010-08-12 | Broadcom Corporation | Implementations of twisted differential pairs on a circuit board |
US9288893B2 (en) * | 2009-02-11 | 2016-03-15 | Broadcom Corporation | Implementations of twisted differential pairs on a circuit board |
US20100307798A1 (en) * | 2009-06-03 | 2010-12-09 | Izadian Jamal S | Unified scalable high speed interconnects technologies |
US20110109416A1 (en) * | 2009-11-12 | 2011-05-12 | Innocom Technology (Shenzhen) Co., Ltd. | Inductor of circuit board |
DE102012206330A1 (en) | 2012-04-17 | 2013-10-17 | Lisa Dräxlmaier GmbH | Twisted wires by printing technology |
US20170133778A1 (en) * | 2013-05-09 | 2017-05-11 | Commscope, Inc. Of North Carolina | High data rate connectors and cable assemblies that are suitable for harsh environments and related methods and systems |
US10665974B2 (en) | 2013-05-09 | 2020-05-26 | Commscope Inc. Of North Carolina | High data rate connectors and cable assemblies that are suitable for harsh environments and related methods and systems |
US10320104B2 (en) * | 2013-05-09 | 2019-06-11 | Commscope, Inc. Of North Carolina | High data rate connectors and cable assemblies that are suitable for harsh environments and related methods and systems |
US20140341581A1 (en) * | 2013-05-15 | 2014-11-20 | Fujitsu Semiconductor Limited | Isolating differential transmission lines |
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JP2016092405A (en) * | 2014-11-04 | 2016-05-23 | キヤノン株式会社 | Printed circuit board, printed wiring board, and differential transmission circuit |
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US20170164528A1 (en) * | 2015-12-07 | 2017-06-08 | Sumitomo Wiring Systems, Ltd. | Protector |
US9781868B2 (en) * | 2015-12-07 | 2017-10-03 | Sumitomo Wiring Systems, Ltd. | Protector |
US11109483B2 (en) * | 2017-12-06 | 2021-08-31 | Samsung Electronics Co., Ltd. | Circuit board and electronic device including same |
WO2020249488A1 (en) * | 2019-06-14 | 2020-12-17 | Bruker Biospin Mri Gmbh | Imaging device, method for designing a circuit board arrangement, and circuit board arrangement |
CN113875319A (en) * | 2019-06-14 | 2021-12-31 | 布鲁克碧奥斯平Mri有限公司 | Imaging device, method for designing circuit board arrangement, and circuit board arrangement |
DE102021005774A1 (en) | 2020-12-17 | 2022-06-23 | Sew-Eurodrive Gmbh & Co Kg | Printed circuit board, in particular printed circuit board that can be used as a primary conductor |
WO2022128353A2 (en) | 2020-12-17 | 2022-06-23 | Sew-Eurodrive Gmbh & Co. Kg | Printed circuit board, in particular printed circuit board which can be used as a primary conductor |
WO2022128353A3 (en) * | 2020-12-17 | 2022-09-01 | Sew-Eurodrive Gmbh & Co. Kg | Printed circuit board, in particular printed circuit board which can be used as a primary conductor |
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