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 devicesInfo
- 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
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).
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)
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 |
-
2011
- 2011-02-17 GB GB201102805A patent/GB2488150B/en not_active Expired - Fee Related
Patent Citations (6)
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 |