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Fabric and yarn structures for improving signal integrity in fabric-based electrical circuits

a technology of fabric-based electrical circuits and conductive yarns, applied in the direction of yarn, weaving, conductive pattern formation, etc., can solve the problems of unsuitability for incorporation in a fabric, and achieve the effects of improving signal integrity in fabric-based electrical circuits, reducing crosstalk in fabric-based circuits, and improving conductive yarn structures

Inactive Publication Date: 2008-11-20
NORTH CAROLINA STATE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to improving signal integrity in fabric-based electrical circuits by incorporating conductive yarns into fabrics. The conductive yarns are twisted together to form a single conductor with sufficient flexibility, conformability, resiliency, bending characteristics, and recovery required for fabric-based circuits to be incorporated in wearable garments. The conductive yarns can be made of various materials such as copper, steel, gold, aluminum, silver, iron, and conductive polymers. The invention also includes coaxial conductive yarns and twisted pair conductive yarns, which help reduce crosstalk in a fabric-based electrical network. The conductive yarns can be woven or knitted into the fabric during the weaving process, making the production faster and more flexible.

Problems solved by technology

Conventional wires lack one or more of these characteristics, making them unsuitable for incorporation in a fabric.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Fabric and yarn structures for improving signal integrity in fabric-based electrical circuits
  • Fabric and yarn structures for improving signal integrity in fabric-based electrical circuits
  • Fabric and yarn structures for improving signal integrity in fabric-based electrical circuits

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Embodiment Construction

[0055]The present invention includes conductive yarn structures for improving signal integrity in fabric-based electrical networks. FIG. 1 illustrates an example of one conductive yarn structure suitable for improving signal integrity in fabric-based electrical networks according to an embodiment of the present invention. Referring to FIG. 1, a conductive yarn structure 100 comprises a coaxial conductive yarn structure. Coaxial conductive yarn structure 100 includes an inner conductive yarn 102 surrounded by an insulating layer 104 and an outer conductive yarn 106, which is preferably also surrounded by an insulating layer 108. Inner conductive yarn 102 includes a plurality of conductive strands being twisted together. The conductive strands may be made of any suitable conductive material, such as such as copper, gold, steel, aluminum, silver, or iron or conductive polymers (inherently conductive polymeric materials, such as polypyrrole, polyacetylene, polythiophene and polyaniline,...

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Abstract

Coaxial and twisted pair conductive yarn structures reduce signal crosstalk between adjacent lines in woven electrical networks. A coaxial conductive yarn structure includes an inner conductive yarn having a plurality of conductive strands twisted together. An outer conductive yarn is wrapped around the inner conductive yarn. An insulating layer separates the inner and outer yarns. A twisted pair conductive yarn structure includes first and second conductive yarns, each including a plurality of conductive strands being twisted together. The first and second conductive yarns are twisted together to form a helical structure. In a woven electrical network, at least one conductor of adjacent conductive yarn structures is connected to ground to reduce signal crosstalk. Coaxial and twisted pair yarn structures may also be formed simultaneously with weaving or knitting the threads that make up the structures into a fabric.

Description

RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 10 / 609,074, filed Jun. 27, 2003, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60 / 392,591, filed Jun. 28, 2002 and U.S. Provisional Patent Application Ser. No. 60 / 447,438, filed Feb. 14, 2003, the disclosures of each of which are incorporated herein by reference in their entireties.GOVERNMENT INTEREST[0002]This invention was made with U.S. Government support under Grant No. N39998-98-C3566 awarded by the Department of Defense-Defense Advanced Research Projects Agency. The U.S. Government has certain rights in the invention.TECHNICAL FIELD[0003]The present invention relates to methods and systems for improving signal integrity in fabric-based electrical circuits. More particularly, the present invention relates to new fabric and yarn structures and methods for making the same for solving signal integrity related problems, such as crosstalk, in woven or knitted ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D03D15/00D02G3/44D02G3/12D02G3/00D03C3/00D03C7/00D02G3/38H05K3/10
CPCD02G3/38D02G3/441H05K3/10H05K2201/029H05K2201/09809Y10T442/105Y10T442/109Y10T442/3065Y10T442/3382Y10T442/339Y10T442/3976Y10T442/655
Inventor DHAWAN, ANUJGHOSH, TUSHAR K.SEYAM, ABDELFATTAH M.MUTH, JOHN
Owner NORTH CAROLINA STATE UNIV
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