|Publication number||US3757028 A|
|Publication date||Sep 4, 1973|
|Filing date||Sep 18, 1972|
|Priority date||Sep 18, 1972|
|Publication number||US 3757028 A, US 3757028A, US-A-3757028, US3757028 A, US3757028A|
|Original Assignee||J Schlessel|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (102), Classifications (21)|
|External Links: USPTO, USPTO Assignment, Espacenet|
ilnited States Patent 1 1 Schlessel 1451 Sept. 4, 1973 1 1 PRINTED-BOARD AND SIMILAR TRANSMISSION-LINE STRUCTURE FOR REDUCING INTERFERENE  Inventor: Joseph Schlessel, 7A Sycamore Dr.,
Great Neck, NY. 11021  Filed: Sept. 18, I972 121 App]. No.1 289,871
 US. Cl 174/33, 174/34, 174/68.5, 174/117 FF, 333/99 R  Int. Cl H011) 11/02, 1101b 7/08  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
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4362899 *||Oct 2, 1980||Dec 7, 1982||University College London||Printed circuit board|
|US4891616 *||Jun 1, 1988||Jan 2, 1990||Honeywell Inc.||Parallel planar signal transmission system|
|US5036160 *||Nov 7, 1989||Jul 30, 1991||Crosspoint Systems, Inc.||Twisted pair backplane|
|US5039824 *||May 18, 1990||Aug 13, 1991||Graphico Co., Ltd.||Printed circuit having twisted conductor lines printed thereon|
|US5248854 *||Apr 5, 1990||Sep 28, 1993||Nec Corporation||Multilevel metallization for vlsi and method for forming the same|
|US5295869 *||Dec 18, 1992||Mar 22, 1994||The Siemon Company||Electrically balanced connector assembly|
|US5310363 *||May 25, 1993||May 10, 1994||Superior Modular Products Incorporated||Impedance matched reduced cross talk electrical connector system|
|US5334271 *||Oct 5, 1992||Aug 2, 1994||W. L. Gore & Associates, Inc.||Process for manufacture of twisted pair electrical cables having conductors of equal length|
|US5357051 *||Jan 31, 1994||Oct 18, 1994||Hwang Richard H||Printed circuit board for reducing radio frequency interferences|
|US5362254 *||Sep 14, 1993||Nov 8, 1994||The Siemon Company||Electrically balanced connector assembly|
|US5389735 *||Aug 31, 1993||Feb 14, 1995||Motorola, Inc.||Vertically twisted-pair planar conductor line structure|
|US5397861 *||Oct 21, 1992||Mar 14, 1995||Mupac Corporation||Electrical interconnection board|
|US5399107 *||May 2, 1994||Mar 21, 1995||Hubbell Incorporated||Modular jack with enhanced crosstalk performance|
|US5414393 *||Jan 15, 1993||May 9, 1995||Hubbell Incorporated||Telecommunication connector with feedback|
|US5424490 *||Feb 25, 1994||Jun 13, 1995||Sony Electronics Inc.||Twisted lead pairs on PCB to improve common mode rejection|
|US5430247 *||Aug 31, 1993||Jul 4, 1995||Motorola, Inc.||Twisted-pair planar conductor line off-set structure|
|US5431586 *||Dec 21, 1993||Jul 11, 1995||Hubbell Incorporated||Electrical connector with modular nose|
|US5432484 *||Aug 20, 1992||Jul 11, 1995||Hubbell Incorporated||Connector for communication systems with cancelled crosstalk|
|US5435752 *||Sep 24, 1993||Jul 25, 1995||The Siemon Company||Electrically balanced connector assembly|
|US5454738 *||May 25, 1994||Oct 3, 1995||Thomas & Betts Corporation||Electrical connector having reduced cross-talk|
|US5459643 *||Nov 22, 1994||Oct 17, 1995||The Siemon Company||Electrically enhanced wiring block with break test capability|
|US5470244 *||Oct 5, 1993||Nov 28, 1995||Thomas & Betts Corporation||Electrical connector having reduced cross-talk|
|US5474474 *||May 13, 1994||Dec 12, 1995||The Siemon Company||Electrically balanced connector assembly|
|US5504273 *||Oct 24, 1994||Apr 2, 1996||Sumitomo Wiring Systems, Ltd.||Fixing means for flat circuit units and the flat circuit units used therefor|
|US5646368 *||Nov 30, 1995||Jul 8, 1997||International Business Machines Corporation||Printed circuit board with an integrated twisted pair conductor|
|US5673009 *||Jul 31, 1995||Sep 30, 1997||Hubbell Incorporated||Connector for communication systems with cancelled crosstalk|
|US5769647 *||May 23, 1996||Jun 23, 1998||The Siemon Company||Modular outlet employing a door assembly|
|US5791943 *||Nov 22, 1995||Aug 11, 1998||The Siemon Company||Reduced crosstalk modular outlet|
|US5805382 *||Jun 21, 1996||Sep 8, 1998||International Business Machines Corporation||Integrated conductor magnetic recording head and suspension having cross-over integrated circuits for noise reduction|
|US5835979 *||May 28, 1997||Nov 10, 1998||Fujitsu Limited||Wiring pattern preventing EMI radiation|
|US5844783 *||Jun 13, 1995||Dec 1, 1998||The Whitaker Corporation||Flexible printed circuit harness device and flexible printed circuit used thereof|
|US5871655 *||Mar 19, 1998||Feb 16, 1999||International Business Machines Corporation||Integrated conductor magnetic recording head and suspension having cross-over integrated circuits for noise reduction|
|US5931703 *||Feb 4, 1997||Aug 3, 1999||Hubbell Incorporated||Low crosstalk noise connector for telecommunication systems|
|US5944535 *||Feb 4, 1997||Aug 31, 1999||Hubbell Incorporated||Interface panel system for networks|
|US6017229 *||Jun 17, 1998||Jan 25, 2000||The Siemon Company||Modular outlet employing a door assembly|
|US6089923 *||Aug 20, 1999||Jul 18, 2000||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|US6132266 *||Jun 7, 1995||Oct 17, 2000||Hubbell Incorporated||Method of reducing crosstalk in connector for communication system|
|US6231397||Apr 16, 1999||May 15, 2001||Thomas & Betts International, Inc.||Crosstalk reducing electrical jack and plug connector|
|US6348651 *||Mar 27, 2000||Feb 19, 2002||Hon Hai Precision Ind. Co., Ltd.||Twist pattern to improve electrical performances of twisted-pair cable|
|US6428362||Jun 6, 2000||Aug 6, 2002||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|US6433272 *||Sep 19, 2000||Aug 13, 2002||Storage Technology Corporation||Crosstalk reduction in constrained wiring assemblies|
|US6744329||Dec 14, 2001||Jun 1, 2004||Yazaki North America, Inc.||Cross talk compensation circuit|
|US6758698||Oct 1, 1996||Jul 6, 2004||Panduit Corp.||Communication connector with capacitor label|
|US6816025||Dec 10, 2003||Nov 9, 2004||Yazaki North America, Inc.||Cross talk compensation circuit|
|US6916996 *||Sep 23, 2003||Jul 12, 2005||Realtek Semiconductor Corp.||Symmetric electrical connection system|
|US6951978 *||Dec 19, 2003||Oct 4, 2005||Richard S. Norman||Conductive fabric with balanced mutual interference amongst conductors|
|US7109819 *||Dec 8, 2004||Sep 19, 2006||Schleifring Und Apparatebau Gmbh||Device for wideband electrical connection of two units that are movable relative to each other|
|US7375979 *||Mar 25, 2005||May 20, 2008||Motorola, Inc.||Method and apparatus for routing a differential pair on a printed circuit board|
|US7638870 *||Jun 23, 2006||Dec 29, 2009||Marvell International Ltd.||Packaging for high speed integrated circuits|
|US7652364 *||Nov 28, 2006||Jan 26, 2010||Teradata Us, Inc.||Crossing conductive traces in a PCB|
|US7868727 *||Jun 5, 2008||Jan 11, 2011||Industrial Technology Research Institute||Inter-helix inductor devices|
|US7884451||Jun 22, 2006||Feb 8, 2011||Marvell World Trade Ltd.||Packaging for high speed integrated circuits|
|US8071890 *||Jul 29, 2008||Dec 6, 2011||Industrial Technology Research Institute||Electrically conductive structure of circuit board and circuit board using the same|
|US8441332 *||Nov 17, 2010||May 14, 2013||Industrial Technology Research Institute||Inter-helix inductor devices|
|US9253875 *||May 15, 2013||Feb 2, 2016||Intel IP Corporation||Isolating differential transmission lines|
|US9288893 *||Aug 7, 2009||Mar 15, 2016||Broadcom Corporation||Implementations of twisted differential pairs on a circuit board|
|US20030112087 *||Dec 14, 2001||Jun 19, 2003||Nguyen Hung Thai||Cross talk compensation circuit|
|US20040256149 *||Sep 23, 2003||Dec 23, 2004||Chi-Kung Kuan||Symmetric electrical connection system|
|US20050168299 *||Dec 8, 2004||Aug 4, 2005||Harry Schilling||Device for wideband electrical connection of two units that are movable relative to each other|
|US20050180053 *||Feb 18, 2004||Aug 18, 2005||Headway Technologies, Inc.||Cross talk and EME minimizing suspension design|
|US20060092929 *||Oct 27, 2005||May 4, 2006||Samsung Electronics Co., Ltd.||Interwoven clock transmission lines and devices employing the same|
|US20060172614 *||Feb 3, 2005||Aug 3, 2006||Ta Sang H||Universal systems printed circuit blocks and method for interconnecting the same|
|US20060215375 *||Mar 25, 2005||Sep 28, 2006||Burhance Gary R||Method and apparatus for routing a differential pair on a printed circuit board|
|US20070018288 *||Jun 22, 2006||Jan 25, 2007||Sehat Sutardja||Packaging for high speed integrated circuits|
|US20070018292 *||Oct 12, 2005||Jan 25, 2007||Sehat Sutardja||Packaging for high speed integrated circuits|
|US20070018305 *||Jun 23, 2006||Jan 25, 2007||Sehat Sutardja||Packaging for high speed integrated circuits|
|US20070138626 *||Nov 28, 2006||Jun 21, 2007||Knighten James L||Crossing conductive traces in a pcb|
|US20070272851 *||Jul 19, 2006||Nov 29, 2007||Iero Demetrio P||Device for modifying and/or rebalancing ionisation for an electrical load|
|US20070277997 *||Jun 1, 2006||Dec 6, 2007||Wei-An Liang||Substrate and layout method|
|US20090045904 *||Jun 5, 2008||Feb 19, 2009||Industrial Technology Research Institute||Inter-helix inductor devices|
|US20090107717 *||Jul 29, 2008||Apr 30, 2009||Industrial Technology Research Institute||Electrically conductive structure of circuit board and circuit board using the same|
|US20090270007 *||Oct 29, 2008||Oct 29, 2009||Samsung Electronics Co., Ltd.||Method of manufacturing liquid crystal display|
|US20100200276 *||Aug 7, 2009||Aug 12, 2010||Broadcom Corporation||Implementations of twisted differential pairs on a circuit board|
|US20100307798 *||Jun 3, 2009||Dec 9, 2010||Izadian Jamal S||Unified scalable high speed interconnects technologies|
|US20110063067 *||Nov 17, 2010||Mar 17, 2011||Industrial Technology Research Institute||Inter-Helix Inductor Devices|
|US20110109416 *||Nov 12, 2010||May 12, 2011||Innocom Technology (Shenzhen) Co., Ltd.||Inductor of circuit board|
|US20110205715 *||Oct 17, 2008||Aug 25, 2011||Poorman Paul W||Transmission line circuit having pairs of crossing conductive lines|
|US20140341581 *||May 15, 2013||Nov 20, 2014||Fujitsu Semiconductor Limited||Isolating differential transmission lines|
|USRE39546 *||Oct 17, 2005||Apr 3, 2007||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|USRE41052||Apr 2, 2007||Dec 22, 2009||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|USRE41311||Nov 22, 2004||May 4, 2010||Commscope, Inc. Of North America||High frequency electrical connector|
|USRE43366||Aug 11, 2010||May 8, 2012||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|USRE44961||May 4, 2012||Jun 24, 2014||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|DE3210998A1 *||Mar 25, 1982||Oct 6, 1983||Hartmann Karlheinz Elektronic||Printed-circuit board|
|DE3326800A1 *||Jul 26, 1983||Feb 14, 1985||Ant Nachrichtentech||Leiterplatte|
|DE102012206330A1||Apr 17, 2012||Oct 17, 2013||Lisa Dräxlmaier GmbH||Verdrillte Leitungen durch Drucktechnologie|
|EP0262780A1 *||Aug 18, 1987||Apr 6, 1988||AT&T Corp.||Marching interconnecting lines in semiconductor integrated circuits|
|EP0400885A1 *||May 23, 1990||Dec 5, 1990||Graphico Co. Ltd.||Printed circuit having twisted conductor lines printed thereon|
|EP0403288A2 *||Jun 14, 1990||Dec 19, 1990||Graphico Co. Ltd.||Bus structure|
|EP0403288A3 *||Jun 14, 1990||May 22, 1991||Graphico Co. Ltd.||Bus structure|
|EP0633632A2 *||Jul 7, 1994||Jan 11, 1995||The Whitaker Corporation||Communications connector terminal arrays having noise cancelling capabilities|
|EP0633632A3 *||Jul 7, 1994||Jul 3, 1996||Whitaker Corp||Communications connector terminal arrays having noise cancelling capabilities.|
|EP0650318A1 *||Oct 18, 1994||Apr 26, 1995||Sumitomo Wiring Systems, Ltd.||Fixing means for flat circuit units and the flat circuit units used therefor|
|EP1235469A2 *||Sep 28, 2001||Aug 28, 2002||Hewlett Packard Company, a Delaware Corporation||Circuit board construction for differential bus distribution|
|EP1235469A3 *||Sep 28, 2001||Mar 31, 2004||Hewlett Packard Company, a Delaware Corporation||Circuit board construction for differential bus distribution|
|EP1865757A1 *||Jun 6, 2006||Dec 12, 2007||Alcatel Lucent||Reduced crosstalk in printed circuit boards by twisting tracks|
|EP2338205A1 *||Oct 17, 2008||Jun 29, 2011||Hewlett-Packard Development Company, L.P.||Transmission line circuit having pairs of crossing conductive lines|
|EP2338205A4 *||Oct 17, 2008||Apr 11, 2012||Hewlett Packard Development Co||Transmission line circuit having pairs of crossing conductive lines|
|WO1990002477A1 *||Aug 8, 1989||Mar 8, 1990||Brunswick Corporation||Apparatus and method for protecting engine electronics from radio frequency interference|
|WO1995006945A1 *||Aug 18, 1994||Mar 9, 1995||Motorola, Inc.||A vertically twisted-pair planar conductor line structure|
|WO1995006955A1 *||Aug 18, 1994||Mar 9, 1995||Motorola, Inc.||A twisted-pair planar conductor line off-set structure|
|WO1998020485A1 *||Nov 6, 1997||May 14, 1998||Quantum Corporation||Head suspension with self-shielding 'twisted' integrated conductor trace array|
|U.S. Classification||174/33, 174/117.0FF, 333/99.00R, 174/262, 174/34|
|International Classification||H05K1/02, H01B7/08, H01B11/02, H05K9/00|
|Cooperative Classification||H05K1/0228, H05K2201/09245, H01B7/08, H05K1/0245, H05K1/0237, H05K2201/097, H01B11/02, H05K9/0039|
|European Classification||H01B11/02, H01B7/08, H05K1/02C2C, H05K9/00B4B|