WO2001056348A1 - Materiau de blindage contre les ondes electromagnetiques - Google Patents

Materiau de blindage contre les ondes electromagnetiques Download PDF

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Publication number
WO2001056348A1
WO2001056348A1 PCT/US2000/001730 US0001730W WO0156348A1 WO 2001056348 A1 WO2001056348 A1 WO 2001056348A1 US 0001730 W US0001730 W US 0001730W WO 0156348 A1 WO0156348 A1 WO 0156348A1
Authority
WO
WIPO (PCT)
Prior art keywords
carbonaceous material
recited
electromagnetic attenuation
group
electromagnetic
Prior art date
Application number
PCT/US2000/001730
Other languages
English (en)
Inventor
James Anthony Cederna
Joseph Michael Klinvex
Thomas Matthew Matviya
Donald Richard Gilbert Palmgren
Original Assignee
Calgon Carbon Corporation
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 Calgon Carbon Corporation filed Critical Calgon Carbon Corporation
Priority to PCT/US2000/001730 priority Critical patent/WO2001056348A1/fr
Publication of WO2001056348A1 publication Critical patent/WO2001056348A1/fr

Links

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
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked

Definitions

  • the present invention relates to a carbonaceous material capable of
  • the present invention also relates to
  • a cellular radio telephone is a portable unit for communication
  • a cellular phone is not confined by the traditional limitations of being
  • the cellular frequency typically used is between 600 and 1800
  • the cellular telephone receives EM wave
  • thermosetting resin for shielding EM interference
  • U.S. Patent 5,310,784 discloses a material and method for shielding EM
  • the material of that invention is a composite of a
  • the carbon powder content is at least 40
  • the shield is fabricated of epoxy or other plastic materials with
  • the shield in the form of a rectangular plate, is
  • the shield reduces the amount of energy striking the head of
  • the composite materials for EM shielding typically have several
  • conductive particles are typically at least about 30 percent by weight.
  • thermoset resin used is phenol formaldehyde or melamine
  • an object of the present invention to provide a material that
  • the present invention provides a light-weight carbonaceous
  • the carbonaceous material of the present invention is characterized
  • invention is manufactured from natural, man-made, or synthetic carbonaceous
  • man-made, or synthetic fiber raw material is carbonized at a temperature less than
  • thermally treated carbonaceous material may be further treated to impart a water repellency and/or fire retardancy.
  • carbonaceous fibers in the form of woven, non- woven, or knitted fabric or sheet.
  • material of the present invention are cotton, cellulose, cellulose derivatives, wool,
  • polyester rayon, nylon, polyethylene, polypropylene, polytetrafluoroethylene,
  • polyamide polyacrylonitrile, other polymeric materials, or combinations thereof.
  • pitches derived from coal tar are suitable man-made raw materials.
  • pitches derived from coal tar are pitches derived from coal tar or
  • the yarn may be woven or knitted together to form a fabric or cloth.
  • sections of the micron-sized fibers or filaments may be compressed
  • viscose process is a particularly suitable raw material for the production of the
  • woven, or knitted fabric, felt, mat, or sheet of the chosen fiber is then carbonized thermally at a temperature less than about 500 °C in an atmosphere of carbon
  • knitted fabric, felt, mat, or sheet may be impregnated with one or more halides of
  • the preferred halides are
  • impregnants will depend on the raw material used, but it typically amounts to
  • the carbonized material is further treated thermally at a
  • atmosphere comprising steam or carbon dioxide to impart desirable properties to
  • atmosphere may be desirable to provide a lower-density carbonaceous material.
  • the thermally treated material may be desirably washed
  • thermally treated carbonaceous materials are characterized by a lower
  • treated carbonaceous materials may be formed into EM shields having various
  • shapes may be used to line the inner surface of a housing for
  • carbonaceous materials are also particularly useful to form shields for the
  • inventions may be used to cover the earphone or the area surrounding the internal
  • a cloth (A) consisting of a double layer of woven rayon yarn was
  • carbonaceous cloth is 2.3 ohm while that of the carbonized material is greater
  • a second rayon fabric (B) was processed under identical
  • a transmitter antenna was located outside the chamber at a
  • a receiver antenna connected to a 50-ohm
  • radio frequency spectrum analyzer was located inside the chamber at a distance of 1 foot from the opening. EM wave was generated in the frequency range between
  • V 0 is the induced voltage in the
  • V c is the induced voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

La présente invention concerne un matériau carboné destiné à l'atténuation électromagnétique possédant une résistance électrique inférieure à 20 ohm, cette résistance électrique étant mesurée sur un élément carré du matériau carboné de dimension 1 cm x 1 cm.
PCT/US2000/001730 2000-01-25 2000-01-25 Materiau de blindage contre les ondes electromagnetiques WO2001056348A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2000/001730 WO2001056348A1 (fr) 2000-01-25 2000-01-25 Materiau de blindage contre les ondes electromagnetiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/001730 WO2001056348A1 (fr) 2000-01-25 2000-01-25 Materiau de blindage contre les ondes electromagnetiques

Publications (1)

Publication Number Publication Date
WO2001056348A1 true WO2001056348A1 (fr) 2001-08-02

Family

ID=21740992

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/001730 WO2001056348A1 (fr) 2000-01-25 2000-01-25 Materiau de blindage contre les ondes electromagnetiques

Country Status (1)

Country Link
WO (1) WO2001056348A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066522A1 (fr) * 2002-02-05 2003-08-14 Calgon Carbon Corporation Procede de production de structures a charbon actif autoportantes
WO2010033093A1 (fr) * 2008-09-18 2010-03-25 Boyteks Tekstil Sanayi Ve Ticaret A.S. Tissu réduisant l'effet de rayonnement non ionisant et ayant la propriété de faire écran aux ondes électromagnétiques

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474685A (en) * 1982-03-29 1984-10-02 Occidental Chemical Corporation High performance molding compounds for shielding electromagnetic interference
EP0278139A1 (fr) * 1984-10-12 1988-08-17 Zoltek Corporation Fabrication des produits feuilletés à base des fibres de carbon avec une résistance de surface contrôlée
EP0368612A1 (fr) * 1988-11-07 1990-05-16 Chomerics, Inc. Usage de mousses polyuréthane conductrices
US4938941A (en) * 1985-10-11 1990-07-03 Basf Aktiengesellschaft Partially carbonized polymeric fibrous material having an electrical resistivity of enhanced stability
US5310784A (en) * 1990-07-31 1994-05-10 Lignyte Co., Ltd. Electromagnetic wave shielding material
US5657386A (en) * 1995-09-06 1997-08-12 Schwanke; Jurgen H. Electromagnetic shield for cellular telephone

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474685A (en) * 1982-03-29 1984-10-02 Occidental Chemical Corporation High performance molding compounds for shielding electromagnetic interference
EP0278139A1 (fr) * 1984-10-12 1988-08-17 Zoltek Corporation Fabrication des produits feuilletés à base des fibres de carbon avec une résistance de surface contrôlée
US4938941A (en) * 1985-10-11 1990-07-03 Basf Aktiengesellschaft Partially carbonized polymeric fibrous material having an electrical resistivity of enhanced stability
EP0368612A1 (fr) * 1988-11-07 1990-05-16 Chomerics, Inc. Usage de mousses polyuréthane conductrices
US5310784A (en) * 1990-07-31 1994-05-10 Lignyte Co., Ltd. Electromagnetic wave shielding material
US5657386A (en) * 1995-09-06 1997-08-12 Schwanke; Jurgen H. Electromagnetic shield for cellular telephone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003066522A1 (fr) * 2002-02-05 2003-08-14 Calgon Carbon Corporation Procede de production de structures a charbon actif autoportantes
US6682667B1 (en) 2002-02-05 2004-01-27 Calgon Carbon Corporation Method for producing self-supporting activated carbon structures
WO2010033093A1 (fr) * 2008-09-18 2010-03-25 Boyteks Tekstil Sanayi Ve Ticaret A.S. Tissu réduisant l'effet de rayonnement non ionisant et ayant la propriété de faire écran aux ondes électromagnétiques

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