EP3008774A1 - Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindage - Google Patents
Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindageInfo
- Publication number
- EP3008774A1 EP3008774A1 EP14731212.8A EP14731212A EP3008774A1 EP 3008774 A1 EP3008774 A1 EP 3008774A1 EP 14731212 A EP14731212 A EP 14731212A EP 3008774 A1 EP3008774 A1 EP 3008774A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- substrate
- antenna
- films
- shielding
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07771—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
Definitions
- MAGNETIC ANTENNA SHIELD USING A COMPOSITE BASED ON MAGNETIC THIN FILMS AND ANTENNA COMPRISING SUCH SHIELD
- An antenna magnetic shielding using a magnetic thin film composite and an antenna comprising such a shield for example in the field of RFI D applications ("Radio Frequency Identification” or "radio-identification”).
- the magnetic shielding of an antenna poses a major problem to be solved, which is that of guaranteeing the performance of the transmitting and receiving antenna when it is placed near a massive conductive material.
- the typical example of an antenna requiring magnetic shielding is that of RFI D applications, the system comprising a tag and a reader.
- the label is composed of an RFI D antenna and a chip in which the information to be read is stored by means of the reader which interrogates the antenna.
- this aerial 10 is placed close to a solid conductive material and the metal plate 11, for example the ground plane of an electronic board, the case of a battery ... this one, because of its conductive character and its thickness, is the seat of induced currents that disturb the signal transmitted or received by the antenna.
- the material used must have a high real permeability and a minimum mass so as not to weigh down the device, ie a maximum ⁇ '/ d ratio, ⁇ ' being the real permeability and the density of the material.
- the magnetic losses that lead to absorption must be limited and expressed through the imaginary permeability ⁇ ".
- Sintered ferrites are traditionally good materials for magnetic shielding. They have high levels of permeability and a good quality factor. However, they are too rigid for flexible labeling applications, for example for identifying wine bottles, and too heavy for mobile phone applications.
- the object of the invention is to solve such a technical problem.
- the invention relates to an antenna magnetic shielding using a composite based on magnetic thin layers, characterized in that it comprises a plurality of films each composed of a thin magnetic layer having a thickness of between 1 and 10 ⁇ deposited on a substrate. flexible electrical insulation thickness between 1 and 100 ⁇ , these films being assembled into a multilayer assembly to form a thickness sheet between 10 and 1000 ⁇ .
- the magnetic properties of the sheet can be made advantageously isotropic by alternating the orientation of the magnetization of the magnetic films.
- the realization of the magnetic layer can be done using various technologies: “Physical Vapor Deposition” or “physical vapor deposition” (cathode sputtering, evaporation, laser ablation ...), “Chemical Vapor Deposition, electrodeposition” or “ chemical vapor deposition “, sol-gel deposition, or any type of process for producing a thin magnetic layer.
- the flexible electrical insulating substrate may be a polymeric substrate. Magnetic films can be separated by layers of glue.
- the substrate may be a self-adhesive substrate.
- the substrate may be a heat-sealable substrate.
- the magnetic layers are ferromagnetic CoZrPt layers deposited on a flexible polyethylene terephthalate substrate.
- the magnetic films are assembled with layers of polyester glue, or thermo-sealed by hot pressing.
- the invention also relates to an antenna comprising such a shield, particularly in the field of RFID applications.
- Figure 1 illustrates the principle of magnetic shielding between a transmitting / receiving antenna and a ground plane.
- FIG. 2 illustrates the magnetic shielding of the invention.
- FIGS. 3A and 3B illustrate the magnetic shielding of the invention, respectively with an anisotropic permeability sheet and with an isotropic permeability sheet.
- FIG. 4 illustrates a first variant of the magnetic shielding of the invention.
- FIG. 5 illustrates a second variant of the magnetic shielding of the invention.
- FIG. 6 illustrates the comparison of the performances of the isotropic or anisotropic sheets with respect to commercial magnetic materials for the magnetic shielding according to the invention.
- the magnetic shielding of the invention comprises magnetic films 22 each formed of a thin magnetic layer 20 having a thickness t c of between 1 and 10 ⁇ deposited on a flexible electrical insulating substrate 21 of thickness tp com taken between 1 and 100 ⁇ . So called “magnetic film” 22 a set of substrate + magnetic layer. An N (N integer greater than 1) number of films are then assembled into a multilayer to form a sheet 23 with a thickness of between 10 and 1000 ⁇ , illustrated in FIG. 2.
- the magnetic layer has a high real permeability, typically greater than 500 at the frequency of operation, for example 13.56 MHz.
- the permeability of the sheet ⁇ is expressed as a function of the permeability of the magnetic layer ⁇ according to the formula:
- the leaflet has a quality factor greater than 30.
- the volume fraction which is the ratio of the volume of magnetic material to the volume of the sheet, is greater than 8%.
- the permeability level of the sheet is thus greater than 40.
- the alternation of magnetic and insulating materials makes it possible to limit the level of reflectivity of the composite, which is the main drawback to the use of a thick monolayer of ⁇ -metal type.
- the permeability of thin magnetic layers is generally anisotropic: it is maximum in a direction of the plane of the layer and close to 1 in a direction orthogonal thereto.
- the orientation of the magnetization of the magnetic films 22 can be alternated so as to obtain a sheet 23 with isotropic permeability, as illustrated in FIG.
- the realization of the magnetic layer can be done using various technologies: “Physical Vapor Deposition” (cathode sputtering, evaporation, laser ablation ...), “Chemical Vapor Deposition”, electroplating, sol-gel deposition, or any type of process for manufacturing a thin magnetic layer ..., on polymeric substrates: polyethylene terephthalate, polyester, polyethylene, polyimide ....
- the flexibility of the composite depends on the volume fraction in magnetic deposit, and the intrinsic mechanical properties (Young's modulus) of the constituents. Young low modulus materials are preferred to lower the rigidity of the assembly.
- the adhesion of the magnetic films constituting the assembly can be done either by inserting glue between each layer, or with a self-adhesive substrate, or with a heat-sealable substrate.
- Patent application WO 01/47064 proposes an antenna operating with an anisotropic composite produced from magnetic films.
- This antenna is a telecommunications antenna, designed with a ground plane and a radiative element. It operates at frequencies higher than 100 MHz, higher than those for which the magnetic shielding is operational, in which the high impedance of the composite is used as a substrate, placed on the ground plane.
- the magnetic films constituting it are then perpendicular to the ground plane, whereas in the invention, the magnetic films are close to the radiative element to guide these field lines, the possible presence of a ground plane close to the antenna being a disadvantage to which the invention makes it possible to remedy.
- a ferromagnetic thin CoZrPt film with a thickness of 1.6 ⁇ deposited on a flexible polyethylene terephthalate substrate 6 ⁇ thick is used, forming a magnetic film.
- the real permeability of the ferromagnetic layer at 10 MHz is 570.
- the imaginary permeability is 10.
- the assembly is carried out with a layer 31 of polyester glue 2 ⁇ thickness.
- the sheet is composed of 10 magnetic films.
- I l presents a quality factor of 57 associated with a real permeability of 98 in its anisotropic version and a quality factor of 58 associated with a real permeability of 49 in its isotropic version.
- a ferromagnetic CoZrPt film with a thickness of 1.6 ⁇ deposited on a flexible polyethylene substrate 6 ⁇ in thickness forming a magnetic film is used.
- the real permeability of the ferromagnetic layer at 10 MHz is 570.
- the imaginary permeability is 10.
- the assembly is thermo-sealed by hot pressing.
- the sheet is composed of 10 magnetic films. It presents a quality factor of 57 associated with a real permeability of 121 in its anisotropic version and a quality factor of 58 associated with a real permeability of 61 in its isotropic version.
- Figure 6 illustrates the performance of these materials taking into account the Q quality factor and the ratio of the permeability of the composite by its density.
- Current commercial RFID magnetic shielding solutions are added for comparison.
- a commercial ferrite 40 a commercial magnetic composite 41
- anisotropic sheets 42 and isotropic sheets 43.
- the isotropic or anisotropic versions of the magnetic sheets supplant the commercial solutions.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1355562A FR3007214B1 (fr) | 2013-06-14 | 2013-06-14 | Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindage |
PCT/EP2014/062250 WO2014198832A1 (fr) | 2013-06-14 | 2014-06-12 | Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindage |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3008774A1 true EP3008774A1 (fr) | 2016-04-20 |
Family
ID=49274798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14731212.8A Withdrawn EP3008774A1 (fr) | 2013-06-14 | 2014-06-12 | Blindage magnetique d'antenne utilisant un composite a base de couches minces magnetiques et antenne comprenant un tel blindage |
Country Status (4)
Country | Link |
---|---|
US (1) | US20160134020A1 (fr) |
EP (1) | EP3008774A1 (fr) |
FR (1) | FR3007214B1 (fr) |
WO (1) | WO2014198832A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11626228B2 (en) * | 2016-12-22 | 2023-04-11 | Rogers Corporation | Multi-layer magneto-dielectric material |
CN110301019B (zh) * | 2017-05-05 | 2021-07-09 | 华为技术有限公司 | 一种变压器及开关电源 |
CN208834871U (zh) * | 2018-08-30 | 2019-05-07 | 台湾东电化股份有限公司 | 导磁性基板以及线圈组件 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070221297A1 (en) * | 2006-03-27 | 2007-09-27 | Tdk Corporation | Flaky soft magnetic metal powder and magnetic core member for rfid antenna |
US20080303735A1 (en) * | 2004-07-28 | 2008-12-11 | Matsushita Electric Industrial Co., Ltd. | Antenna Apparatus |
WO2011068695A1 (fr) * | 2009-12-02 | 2011-06-09 | 3M Innovative Properties Company | Film mince de blindage contre les interférences électromagnétiques (emi) multicouche à forte perméabilité rf |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2653599B1 (fr) * | 1989-10-23 | 1991-12-20 | Commissariat Energie Atomique | Materiau composite stratifie presentant des proprietes electromagnetiques absorbantes et son procede de fabrication. |
JP2005006263A (ja) * | 2003-06-16 | 2005-01-06 | Mitsubishi Materials Corp | 磁芯部材及びそれを用いたrfid用アンテナ |
CN100594766C (zh) * | 2005-04-20 | 2010-03-17 | 株式会社东芝 | 防止电磁波零部件及使用防止电磁波零部件的电子设备 |
-
2013
- 2013-06-14 FR FR1355562A patent/FR3007214B1/fr active Active
-
2014
- 2014-06-12 WO PCT/EP2014/062250 patent/WO2014198832A1/fr active Application Filing
- 2014-06-12 EP EP14731212.8A patent/EP3008774A1/fr not_active Withdrawn
- 2014-06-12 US US14/896,841 patent/US20160134020A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080303735A1 (en) * | 2004-07-28 | 2008-12-11 | Matsushita Electric Industrial Co., Ltd. | Antenna Apparatus |
US20070221297A1 (en) * | 2006-03-27 | 2007-09-27 | Tdk Corporation | Flaky soft magnetic metal powder and magnetic core member for rfid antenna |
WO2011068695A1 (fr) * | 2009-12-02 | 2011-06-09 | 3M Innovative Properties Company | Film mince de blindage contre les interférences électromagnétiques (emi) multicouche à forte perméabilité rf |
Also Published As
Publication number | Publication date |
---|---|
WO2014198832A1 (fr) | 2014-12-18 |
FR3007214B1 (fr) | 2015-07-17 |
FR3007214A1 (fr) | 2014-12-19 |
US20160134020A1 (en) | 2016-05-12 |
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