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GB2488150B - Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices - Google Patents

Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices

Info

Publication number
GB2488150B
GB2488150B GB201102805A GB201102805A GB2488150B GB 2488150 B GB2488150 B GB 2488150B GB 201102805 A GB201102805 A GB 201102805A GB 201102805 A GB201102805 A GB 201102805A GB 2488150 B GB2488150 B GB 2488150B
Authority
GB
United Kingdom
Prior art keywords
dielectric
screen
electromagnetic
figures
islands
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB201102805A
Other versions
GB201102805D0 (en
GB2488150A (en
Inventor
Andrew Ian Briggs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB201102805A priority Critical patent/GB2488150B/en
Publication of GB201102805D0 publication Critical patent/GB201102805D0/en
Publication of GB2488150A publication Critical patent/GB2488150A/en
Application granted granted Critical
Publication of GB2488150B publication Critical patent/GB2488150B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
    • 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
    • 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
    • H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
    • 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
    • H05K9/0098—Shielding materials for shielding electrical cables

Landscapes

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

Abstract

A screen for blocking high frequency electromagnetic emissions EMI from electromagnetic devices is formed of conductive elements 3 separated by a supporting dielectric substance 4 with high Dielectric Constant and High Dissipation factor. Preferably the loss factor and/or the dissipation factor of the dielectric is above 0.1 at 1 Mhz; the dielectric constant is above 4. The dielectric may be a composite of a ferro-electric polymer, such as PVDF, and a mineral such as Barium titanate (BaTiO3) to give loss factors above 3 and dielectric constants above 15. The Screen may comprise islands 3 on the surface or within the dielectric 4 and may comprise an array of regular hexagonal elements with an edge length of 1mm (see figures 3a, 3b and 5) The screen may also comprise straight or zig-zag strips, granular islands and other shapes (figures 2a, 2b) The screen may be formed as a corrugated sheet E1, or a plane E3 for using in a mobile phone. The screen may also be used in the construction of cables to reduce interference (figures 4a, 4b ) between conductors, such as sets of twisted pairs (7,8).
GB201102805A 2011-02-17 2011-02-17 Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices Expired - Fee Related GB2488150B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201102805A GB2488150B (en) 2011-02-17 2011-02-17 Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201102805A GB2488150B (en) 2011-02-17 2011-02-17 Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices

Publications (3)

Publication Number Publication Date
GB201102805D0 GB201102805D0 (en) 2011-04-06
GB2488150A GB2488150A (en) 2012-08-22
GB2488150B true GB2488150B (en) 2014-01-08

Family

ID=43881283

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201102805A Expired - Fee Related GB2488150B (en) 2011-02-17 2011-02-17 Method and design for screening or reducing electromagnetic emmisions from electrical or electromagnetic devices

Country Status (1)

Country Link
GB (1) GB2488150B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104100A (en) * 1964-03-16 1968-02-21 Rogers Corp Making electrical cables and the like
WO1994024724A1 (en) * 1993-04-09 1994-10-27 Chomerics, Inc. Broadband electromagnetic energy absorber
US6492588B1 (en) * 1998-08-26 2002-12-10 Prestolite Wire Corporation Self suppression wire or cable, and ferrite bead in combination
WO2004012937A1 (en) * 2002-08-02 2004-02-12 Integument Technologies, Inc. Oxyhalopolymer protective multifunctional appliques and paint replacement films
WO2008118645A1 (en) * 2007-03-22 2008-10-02 3M Innovative Properties Company Electromagnetic wave shielding material and sheet
GB2452665A (en) * 2006-06-02 2009-03-11 Mitsubishi Cable Ind Ltd Radio wave shielding partitioning plane material and method for manufacturing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1104100A (en) * 1964-03-16 1968-02-21 Rogers Corp Making electrical cables and the like
WO1994024724A1 (en) * 1993-04-09 1994-10-27 Chomerics, Inc. Broadband electromagnetic energy absorber
US6492588B1 (en) * 1998-08-26 2002-12-10 Prestolite Wire Corporation Self suppression wire or cable, and ferrite bead in combination
WO2004012937A1 (en) * 2002-08-02 2004-02-12 Integument Technologies, Inc. Oxyhalopolymer protective multifunctional appliques and paint replacement films
GB2452665A (en) * 2006-06-02 2009-03-11 Mitsubishi Cable Ind Ltd Radio wave shielding partitioning plane material and method for manufacturing
WO2008118645A1 (en) * 2007-03-22 2008-10-02 3M Innovative Properties Company Electromagnetic wave shielding material and sheet

Also Published As

Publication number Publication date
GB201102805D0 (en) 2011-04-06
GB2488150A (en) 2012-08-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20160217