WO2012175846A1 - Dispositif pour proteger un espace a proximite d'une source magnetique et procede de fabrication d'un tel dispositif - Google Patents
Dispositif pour proteger un espace a proximite d'une source magnetique et procede de fabrication d'un tel dispositif Download PDFInfo
- Publication number
- WO2012175846A1 WO2012175846A1 PCT/FR2012/051328 FR2012051328W WO2012175846A1 WO 2012175846 A1 WO2012175846 A1 WO 2012175846A1 FR 2012051328 W FR2012051328 W FR 2012051328W WO 2012175846 A1 WO2012175846 A1 WO 2012175846A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- electrically conductive
- source
- ferromagnetic material
- conductive material
- Prior art date
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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
- H05K9/0075—Magnetic shielding materials
-
- 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
- H05K9/0001—Rooms or chambers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
Definitions
- the invention relates to a device for protecting a space near a magnetic source.
- the magnetic energy radiated in a space near a magnetic source can disturb the operation of electronic devices (electromagnetic compatibility) and / or present a danger for a human being who occupies this space when this energy results from a high power even short-lived or weaker power but to which the human being is exposed longer.
- Such a device comprises a shield or multilayer screen, as for example that described in EP1399929.
- the shield disclosed by this document is wrapped around an electric cable. It comprises at least two layers of ferromagnetic material.
- This shielding mode is not appropriate when the magnetic source is of more complex shape than a simple rectilinear tubular shape. This may be the case when the magnetic source is not limited to the cable itself but also includes connection terminals or various electronic power equipment. This may be the case also for a cable itself when it undergoes certain curvatures in static mode in the path of one electrical equipment to another or in dynamic mode when the cables are connected to mobile equipment. These curvatures can lead to breaks in the layers of ferromagnetic material that no longer allow to channel the magnetic field lines and which then lose shielding its magnetic screen qualities.
- the subject of the invention is a device for protecting a space in the vicinity of a magnetic source, against a magnetic energy radiated by said source, comprising a first sheet of material ferromagnetic deployed between said space and said source.
- the device is remarkable in that it comprises a first sheet of electrically conductive material of diamagnetic or paramagnetic nature which is deployed between said first sheet of ferromagnetic material and said space to be protected.
- the device comprises a second sheet of electrically conductive material of diamagnetic or paramagnetic nature which is deployed between said first sheet of ferromagnetic material and said magnetic source.
- the device comprises a second sheet of ferromagnetic material which is deployed between said first sheet of ferromagnetic material and said first sheet of electrically conductive material.
- said one or more sheets of electrically conductive material is or is of greater surface area than that of the sheet or sheets of ferromagnetic material so as to completely cover said sheet or sheets of ferromagnetic material.
- the ferromagnetic material has a high relative magnetic permeability greater than 100,000.
- the ferromagnetic material is an amorphous iron-based alloy with an unoriented nanocrystalline structure.
- said alloy comprises a chemical element of a group comprising cobalt and nickel.
- At least one sheet of ferromagnetic material is covered with at least one layer of electrically insulating material.
- the electrically conductive material of diamagnetic or paramagnetic nature comprises aluminum.
- the invention also relates to a method of manufacturing a device for protecting a space in the vicinity of a magnetic source against a magnetic energy radiated by said source.
- the method is notable in that it comprises steps of:
- first sheet of electrically conductive material of diamagnetic or paramagnetic nature so as to be able to deploy it with a first face facing said space to be protected;
- the manufacturing method further comprises the steps of:
- the invention specifically covers a moving object comprising at least one electrical member which is a source of magnetic radiation.
- the moving object is striking in that it comprises a device according to the invention so as to provide a low mass protection against a magnetic energy radiated by said source.
- the mobile object covered by the invention is a motor vehicle comprising a passenger compartment which includes a space near said body.
- the device according to the invention is arranged in the motor vehicle between the body and the cockpit.
- the invention is particularly interesting for any application where the lightness, in other words the saving of mass is important, for example all vehicles (aircraft, trains, ...), portable systems or other moving objects.
- Figure 1 is a schematic view of a device according to the invention
- Figure 2 is a schematic view of another device according to the invention
- Figure 3 is an exploded view of components shaped and combined according to the method according to the invention
- FIG. 1 shows a device 1 for protecting a space 2 near a magnetic source 3, against a magnetic energy radiated by the source 3.
- Such a device is necessary in many areas to protect a human being against the magnetic energy radiated by devices that are useful elsewhere.
- the vehicle 22 shown in Figure 4 comprises wheels 24, 25 and a machine 23 for driving all or part of these wheels.
- the machine 23 is controlled by a power supply unit 13.
- the power supply unit 13 When the machine 23 is a heat engine, the power supply unit 13, of a first nature, generates for example ignition sequences in the case of a gasoline combustion and / or injectors control sequences in the case of a gasoline or diesel combustion.
- the power supply unit 13 When the machine 23 is an electric machine, the power supply unit 13, of a second nature, generates in particular the electric current which operates the machine 23 motor or generator in the positive or negative direction of the current.
- the power supply unit 13 then includes a battery and a power electronics.
- the power supply unit 13 and in particular the cable or cables 33 which connect the power supply unit machine 23, are organs that constitute a magnetic field source, static or, especially when the current varies, radiated.
- Other members in a motor vehicle or in other environments may also constitute a source 3 of static or radiated magnetic field.
- the vehicle 22 comprises a passenger compartment equipped with seats 26, 27 to respectively accommodate a driver and at least one passenger.
- the seat 27 is placed above the members 13, 23, 33.
- the part of the passenger compartment occupied by the seat 27, thus comprises a space 12 near the magnetic source.
- the space 12 requires a device 21 which shields the magnetic radiation so as not to expose the passenger to magnetic fields that may be detrimental to his health.
- the device 1 of FIG. 1 comprises a sheet 4 of ferromagnetic material deployed between the space 2 and the magnetic source 3.
- the magnetic permeability ⁇ of a medium different from the vacuum is obtained by multiplying the vacuum permeability by a coefficient of proportionality y r named relative permeability which characterizes the medium.
- the aforementioned knowledge has been used to vary an electric current in the source 3 so as to obtain a magnetic field generated by the magnetic source, at frequencies which describe a spectrum varying from a few Hz to several MHz.
- the device 1 was sought to configure the device 1 so as to attenuate as much as possible the magnetic fields in a frequency range varying from 10 Hz to 1 kHz, or even up to 10 kHz.
- the most suitable materials for shielding magnetic fields are, a priori, ferromagnetic materials.
- paramagnetic electrically conductive materials such as aluminum can significantly attenuate magnetic fields at high frequencies, they are poorly suited for shielding low frequency magnetic fields. While an aluminum plate of limited dimensions and 1 mm thick achieved an attenuation of -58 dB in a frequency band between 100 kHz and 2 MHz, this plate allowed only attenuation limited to only -2 dB for frequencies below 100 Hz and only -7 dB for frequencies close to 400 Hz.
- a ferromagnetic material having a relative magnetic permeability y r of high value has been sought, in other words greater than 100,000 so as to obtain good efficiency at low frequencies.
- the metal mu consisting of substantially 77 to 80% nickel, substantially 15% iron supplemented with copper and or molybdenum.
- This material has the particularity of having a relative permeability of the order of 150 000 which favors the deviation low frequency magnetic field lines and a Curie temperature of the order of 420 ° C which is very suitable for hot environments as may be encountered near an engine.
- a metal mu sheet provides a substantially constant attenuation varying alternately weakly around -7.5 dB in the frequency range of 10 Hz to 1000 Hz, decreasing to substantially -17 dB in the range of 1 to 4 kHz then remaining substantially constant around this last value beyond 4 kHz. These values also depend on the size of the sheet.
- NANOPERM TM is an iron-based alloy comprising silicon and smaller amounts of copper, niobium and boron.
- the supplier specification indicates a magnetostriction coefficient of less than 0.5 ppm.
- FINEMET TM is an iron-based alloy that also includes a chemical element of a group comprising silicon.
- the supplier specification indicates a relative magnetic permeability y r of the order of 70,000 and a very low magnetostriction coefficient of the order of 10. This low magnetostriction coefficient is beneficial in the fight against noise generated by magnetic fields oscillating in the audible frequency bands.
- a sheet of FINEMET TM is a sheet of ferromagnetic material covered on each of its faces by a layer of electrically insulating material.
- Each layer of electrically insulating material comprises a film of PET (polyethylene terephthalate) to a thickness of 25 ⁇ m connected to the sheet of ferromagnetic material by a layer of adhesive material a thickness of 25 ⁇ m.
- PET polyethylene terephthalate
- a sheet of ANFM material 0.12 mm thick is thus obtained.
- a sheet of ANFM material 0.12 mm thick made it possible to obtain a substantially constant attenuation varying alternately weakly around -2 dB in the frequency range of 10. Hz at 1000 Hz, evolving to substantially -14 dB in the range of 1 to 5 kHz and then remaining substantially constant around the latter value beyond 5 kHz.
- a superimposition of two sheets of ANFM material 0.12 mm thick obtained a substantially constant attenuation varying alternately weakly around -4 dB in the frequency range of 10 Hz to 1000 Hz, evolving until substantially -15 dB in the range of 1 to 3 kHz and then remaining substantially constant around the latter value beyond 3 kHz. It can be seen that the doubling of the sheets gives a purely proportional performance improvement at low frequencies and an almost zero improvement at high frequencies.
- an aluminum foil has been deployed between the source and the sheet or sheets of ferromagnetic material.
- the sheet of electrically conductive material eliminating or at least strongly reducing the high frequency components of the magnetic field, thus relieves the screen function to be filled by the ferromagnetic material by transmitting it essentially only the low frequency components of the magnetic field.
- the invention teaches a marked preference for the use of two sheets of non-ferromagnetic metal, more precisely of paramagnetic metal.
- the device 1 of FIG. 1 comprises a second sheet 6 of electrically conductive material of diamagnetic or paramagnetic nature which is deployed between the sheet 4 of ferromagnetic material and the magnetic source 3.
- a superposition of two sheets of FINEMET TM 0.12 mm thick between two sheets of aluminum 1 mm thick provided an attenuation evolving with a steep slope of -7 dB for a frequency of 50 Hz up to -35 dB for a frequency of 350 Hz, still evolving but with a slight slope up to substantially -37 dB at 1 kHz and then remaining substantially constant around -36 dB above 5 kHz. Contrary to previous tests, it is found that the doubling of the leaves provides a noticeable performance improvement at low frequencies and a slight tendency to reverse at high frequencies.
- FIG. 2 An optimal solution appears to be that of FIG. 2 on which the device 11 comprises a second sheet 7 of ferromagnetic material which is deployed between the first sheet 4 of ferromagnetic material and the first sheet 5 of electrically conductive material.
- FIG. 3 makes it possible to explain a method of manufacturing the device for protecting the space near the magnetic source against the magnetic energy radiated by the source.
- a first step is to form a first sheet 15 of electrically conductive material of diamagnetic or paramagnetic nature.
- the forming comprises deformation actions in the press of a sheet, for example 1 mm thick comprising aluminum or molding actions of a plate when the material is difficult to draw.
- a sheet 15 In order to be able to deploy the sheet 15 with a first face facing the space to be protected, it is cut, folded and / or factory atria 8, 10 in which holes are drilled which will fix the leaf at the edge space to protect. It is also possible to fashion a tab 18 which is not pierced in order to obtain a fixing method by gluing or for any other function.
- a second step is to form a second sheet 16 of electrically conductive material of diamagnetic or paramagnetic nature in a manner similar to that of the first step.
- atria 9, 20 superimposed on the atria 8, 10 are cut, folded and / or machined and holes are drilled to fix the sheet 16 with the sheet 15. It is also possible to form a tab 19 not pierced in order to cooperate with the tongue 18.
- a third step consists in deploying one or more, preferably two, sheets 14, 17 of ferromagnetic material on a second face of the first sheet 15 of electrically conductive material, opposite to the first face of the first sheet 15.
- each leaves 14, 17 is preferably smaller than that of each of the sheets 15, 16 of electrically conductive material so as to be completely covered by the sheets 15, 16.
- the sheets 14, 17 being suitable only for deformation by bending in one direction, they are not brought into contact with the atria 8, 9, 10, 20 to avoid breaking during a folding that would be destructive.
- a fourth step consists in positioning the second sheet 16 of electrically conductive material so that the sheet or sheets 14, 17 of ferromagnetic material are deployed on a second face of the second sheet 16 of electrically conductive material, opposite to the first face of the second sheet 16 of electrically conductive material.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280040198.5A CN103748980B (zh) | 2011-06-20 | 2012-06-14 | 用于保护与磁源相邻空间的装置以及用于制造这种装置的方法 |
EP12731568.7A EP2721913B1 (fr) | 2011-06-20 | 2012-06-14 | Dispositif pour proteger un espace a proximite d'une source magnetique et procede de fabrication d'un tel dispositif |
BR112013033030A BR112013033030A2 (pt) | 2011-06-20 | 2012-06-14 | dispositivo para proteger um espaço na proximidade de uma fonte magnética, processo de fabricação do mesmo, e, objeto móvel |
US14/128,331 US9326432B2 (en) | 2011-06-20 | 2012-06-14 | Device for protecting a space adjacent to a magnetic source, and method for manufacturing such a device |
JP2014516413A JP2014528156A (ja) | 2011-06-20 | 2012-06-14 | 磁気源に近接する空間を保護するためのデバイス及びそのようなデバイスを製造するための方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1155411A FR2976765B1 (fr) | 2011-06-20 | 2011-06-20 | Dispositif pour proteger un espace a proximite d'une source magnetique et procede de fabrication d'un tel dispositif |
FR1155411 | 2011-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012175846A1 true WO2012175846A1 (fr) | 2012-12-27 |
Family
ID=46456887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2012/051328 WO2012175846A1 (fr) | 2011-06-20 | 2012-06-14 | Dispositif pour proteger un espace a proximite d'une source magnetique et procede de fabrication d'un tel dispositif |
Country Status (7)
Country | Link |
---|---|
US (1) | US9326432B2 (fr) |
EP (1) | EP2721913B1 (fr) |
JP (1) | JP2014528156A (fr) |
CN (1) | CN103748980B (fr) |
BR (1) | BR112013033030A2 (fr) |
FR (1) | FR2976765B1 (fr) |
WO (1) | WO2012175846A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104995700A (zh) * | 2014-02-17 | 2015-10-21 | 庞巴迪运输有限公司 | 车辆和制造车辆的方法 |
JP2017527327A (ja) * | 2014-07-03 | 2017-09-21 | セント・ジュード・メディカル・インターナショナル・ホールディング・エスエーアールエルSt. Jude Medical International Holding S.a,r.l. | 局所磁場発生装置 |
US10765483B2 (en) | 2017-04-20 | 2020-09-08 | Medtronic Navigation, Inc. | Navigation system and method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3029386A1 (fr) * | 2014-11-28 | 2016-06-03 | Commissariat Energie Atomique | Blindage magnetique ameliore |
KR102330098B1 (ko) * | 2017-04-24 | 2021-11-23 | 주성엔지니어링(주) | 기판 처리 장치 |
Citations (5)
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US4890083A (en) * | 1988-10-20 | 1989-12-26 | Texas Instruments Incorporated | Shielding material and shielded room |
EP0720421A2 (fr) * | 1994-12-27 | 1996-07-03 | Euroshield Oy | Structure d'une paroi d'une chambre blindée magnétiquement et méthode pour blinder |
JP2002291113A (ja) * | 2001-03-27 | 2002-10-04 | Zero Sports Co Ltd | 電気自動車 |
EP1399929A1 (fr) | 2001-06-29 | 2004-03-24 | Pirelli & C. S.p.A. | Procede de blindage du champ magnetique cree par une ligne de transmission electrique, et ligne de transmission electrique a blindage magnetique |
DE102009039600B3 (de) * | 2009-09-01 | 2011-03-17 | Reto Breitenmoser | Magnetfeldabschirmung für elektromagnetische Felder im Frequenzbereich von 0 Hz bis 50 kHz |
Family Cites Families (13)
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US3212865A (en) * | 1962-06-13 | 1965-10-19 | Texas Instruments Inc | Composite electrically conductive spring materials |
US3555169A (en) * | 1968-01-02 | 1971-01-12 | Texas Instruments Inc | Composite layer material having an outer layer of copper and successive layer of stainless steel, low carbon steel and copper |
US5210493A (en) * | 1992-02-27 | 1993-05-11 | General Motors Corporation | Method for embedding wires within a powder metal core and sensor assembly produced by such a method |
JPH09238919A (ja) * | 1996-03-12 | 1997-09-16 | Toshiba Corp | 磁気共鳴イメージング装置 |
JP3900559B2 (ja) * | 1996-09-19 | 2007-04-04 | 大同特殊鋼株式会社 | 磁気遮蔽用シートとその製造方法及びこれを用いたケーブル |
JPH11284388A (ja) * | 1998-03-30 | 1999-10-15 | Hitachi Metals Ltd | 磁気および電磁波シールドパネルおよびシールドルーム |
US6282848B1 (en) * | 1998-05-08 | 2001-09-04 | Imedco Ag | Floor, ceiling and wall construction for a magnetically shielded room |
FI20020025A0 (fi) * | 2002-01-08 | 2002-01-08 | 4 D Neuroimaging Oy | Komposiittiseinõrakenne parannetun magneettisuojauksen aikaansaamiseksi |
US6936763B2 (en) * | 2002-06-28 | 2005-08-30 | Freescale Semiconductor, Inc. | Magnetic shielding for electronic circuits which include magnetic materials |
US6731968B2 (en) * | 2003-07-29 | 2004-05-04 | 4-D Neuroimaging | Magnetically shielded room with internal active magnetic field cancellation, and its use |
JP5316921B2 (ja) * | 2007-03-16 | 2013-10-16 | 日立金属株式会社 | Fe基軟磁性合金、およびこれを用いた磁性部品 |
US7612553B2 (en) * | 2007-07-26 | 2009-11-03 | Honeywell International Inc. | Current sensor having sandwiched magnetic permeability layer |
JP5328593B2 (ja) * | 2009-10-02 | 2013-10-30 | 鹿島建設株式会社 | 開放型磁気シールド構造 |
-
2011
- 2011-06-20 FR FR1155411A patent/FR2976765B1/fr not_active Expired - Fee Related
-
2012
- 2012-06-14 WO PCT/FR2012/051328 patent/WO2012175846A1/fr active Application Filing
- 2012-06-14 JP JP2014516413A patent/JP2014528156A/ja active Pending
- 2012-06-14 BR BR112013033030A patent/BR112013033030A2/pt not_active Application Discontinuation
- 2012-06-14 US US14/128,331 patent/US9326432B2/en active Active
- 2012-06-14 CN CN201280040198.5A patent/CN103748980B/zh active Active
- 2012-06-14 EP EP12731568.7A patent/EP2721913B1/fr active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4890083A (en) * | 1988-10-20 | 1989-12-26 | Texas Instruments Incorporated | Shielding material and shielded room |
EP0720421A2 (fr) * | 1994-12-27 | 1996-07-03 | Euroshield Oy | Structure d'une paroi d'une chambre blindée magnétiquement et méthode pour blinder |
JP2002291113A (ja) * | 2001-03-27 | 2002-10-04 | Zero Sports Co Ltd | 電気自動車 |
EP1399929A1 (fr) | 2001-06-29 | 2004-03-24 | Pirelli & C. S.p.A. | Procede de blindage du champ magnetique cree par une ligne de transmission electrique, et ligne de transmission electrique a blindage magnetique |
DE102009039600B3 (de) * | 2009-09-01 | 2011-03-17 | Reto Breitenmoser | Magnetfeldabschirmung für elektromagnetische Felder im Frequenzbereich von 0 Hz bis 50 kHz |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104995700A (zh) * | 2014-02-17 | 2015-10-21 | 庞巴迪运输有限公司 | 车辆和制造车辆的方法 |
JP2017527327A (ja) * | 2014-07-03 | 2017-09-21 | セント・ジュード・メディカル・インターナショナル・ホールディング・エスエーアールエルSt. Jude Medical International Holding S.a,r.l. | 局所磁場発生装置 |
US10722140B2 (en) | 2014-07-03 | 2020-07-28 | St. Jude Medical International Holding S.À R.L. | Localized magnetic field generator |
US11771338B2 (en) | 2014-07-03 | 2023-10-03 | St Jude Medical International Holding S.À R.L. | Localized magnetic field generator |
US10765483B2 (en) | 2017-04-20 | 2020-09-08 | Medtronic Navigation, Inc. | Navigation system and method |
US11564747B2 (en) | 2017-04-20 | 2023-01-31 | Medtronic Navigation, Inc. | Navigation system and method |
US11660146B2 (en) | 2017-04-20 | 2023-05-30 | Medtronic Navigation, Inc. | Navigation system and method |
Also Published As
Publication number | Publication date |
---|---|
EP2721913A1 (fr) | 2014-04-23 |
CN103748980A (zh) | 2014-04-23 |
US9326432B2 (en) | 2016-04-26 |
BR112013033030A2 (pt) | 2017-01-31 |
JP2014528156A (ja) | 2014-10-23 |
FR2976765B1 (fr) | 2015-05-01 |
EP2721913B1 (fr) | 2019-01-23 |
CN103748980B (zh) | 2018-07-03 |
FR2976765A1 (fr) | 2012-12-21 |
US20140131087A1 (en) | 2014-05-15 |
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