WO1998019361A1 - Antenne de champ magnetique blindee en circuit imprime - Google Patents
Antenne de champ magnetique blindee en circuit imprime Download PDFInfo
- Publication number
- WO1998019361A1 WO1998019361A1 PCT/FR1997/001925 FR9701925W WO9819361A1 WO 1998019361 A1 WO1998019361 A1 WO 1998019361A1 FR 9701925 W FR9701925 W FR 9701925W WO 9819361 A1 WO9819361 A1 WO 9819361A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- printed circuit
- turn
- rings
- hand
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 19
- 239000011810 insulating material Substances 0.000 claims abstract description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims description 20
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 150000001768 cations Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000001465 metallisation Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- H01Q1/2216—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 interrogator/reader equipment
-
- 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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- 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
- 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
- H01Q7/04—Screened antennas
Definitions
- the present invention relates to an armored magnetic cham p antenna of the com type carrying at least one turn of a metallic element and a metallic tubular shield disposed around said element.
- It relates in particular to an antenna intended to be used in association with a smart card reader of the contactless type.
- coaxial cable element is flexible, the shielding consisting of a metal braid arranged around a conductive wire sheathed in plastic; the other includes a shield made up of a rigid metal tube, for example made of copper, disposed around a conductive wire also sheathed in plastic
- This type of antenna used in a metallic environment requires associating a ferrite element and a metallic screen arranged below so as to provide it with immunity to disturbances from surrounding magnetic fields.
- the ceramic element Due to its fragility, the ceramic element must be protected from vibrations and shocks which may occur against the antenna or the screen. It is therefore necessary to ensure an assembly of the assembly which protects the brittle element.
- the antenna and the ceramic element are embedded in resin. This has the disadvantage of being inconvenient and expensive to implement. In addition, the antenna obtained is not geometrically reproducible.
- the present invention aims to overcome the drawbacks exposed above.
- the object of the invention is therefore to design a reproducible antenna, geometrically stable and at low cost.
- the invention also aims to design an antenna suitable for use in a metallic environment which is insensitive to vibrations and shock and whose design allows easy, reproducible and economical manufacture.
- the invention relates to a shielded magnetic cham p antenna comprising at least one turn of a metallic element and a metallic tubular shielding disposed around said element.
- the turn is made in printed circuit on a card made of insulating material, such as a printed circuit board and in that said shield consists on the one hand, of two open rings, made in printed circuit, and disposed respectively on a lower card and an upper card in insulating material, said cards being assembled by enclosing the turn, and on the other hand, a plurality of metallic vias distributed on either side of the turn, said vias connecting the edges of the two rings through said cards. These vias are preferably distributed uniformly. Thanks to such a design, the antenna is very rigid, therefore very geometrically stable compared to the antennas of the prior art.
- said shielding consists, on the one hand, of two open rings, produced in printed circuit, and disposed respectively on a lower annular support and an upper annular support in insulating material, said supports enclosing the turn, and on the other hand, two metal films connecting the edges of the two rings on either side of the turn, said films being deposited on the edges of the annular support.
- this design allows the antenna format to be changed very easily since most operations are automated.
- the invention also relates to a magnetic field antenna device comprising a printed circuit antenna according to the invention, a layer of ferrite, a metal screen, two flexible sheets arranged respectively between the antenna and the layer of ferrite. on the one hand, and between the ferrite layer and the metal screen on the other hand These sheets can include an adhesive on their faces to facilitate assembly
- This device by assembling various layers has the advantage of adapt the antenna very easily to a metallic environment subject to vibrations or mechanical shocks.
- the device may include clamping means for assembling and clamping together, the ferrite layer, the flexible sheets and the metal screen
- the device comprises means for keeping the ferrite away from the antenna and keeping the screen away from the ferrite.
- FIG. 2 shows an antenna according to another embodiment
- FIG. 3 is a cross section of the antenna of Figure 1 along A-A, illustrating its section;
- FIG. 4 is a cross section of the antenna according to Figure 3, the latter being in the process of assembly;
- - Figure 5 is a cross section of the antenna of Figure 2 along B-B, illustrating its section;
- - Figure 6 is a cross section of the antenna according to Figure 5, the latter being in the course of assembly;
- - Figure 7 shows im award-winning circuit boards used for the realization of the antenna with placement of a complementary circuit
- - Figure 8 shows the components of the antenna of Figure 2;
- FIG. 9 represents a detailed top view of the antenna according to FIG. 2.
- FIG. 10 shows a decomposed view illustrating the assembly of the various components of the antenna device according to the invention.
- Figures 1 and 2 show respectively a first and a second embodiment of an antenna according to the invention.
- the antenna has a general loop form and has a rectangular section AA.
- This section helps to strengthen its geometric stability.
- the shielded magnetic field antenna comprises at least one turn 3b of a metallic element and a metallic tubular shield 5b, 6b,
- the antenna com carries a single flat and thin element 3b made of copper, placed in the center of a tubular structure of rectangular section 5b, 6b, 7b, 8b.
- the element 3b is sandwiched between two rings 9b, 12b of insulating material of rectangular section 10b, 9b preferably of the same thickness.
- the insulating material is epoxy glass.
- one of the two rings 12b consists of two rings 4b and 10b connected together (fig.4), for example by gluing.
- the tubular shielding consists of a thin metallic film, for example a 35 ⁇ m copper film.
- the antenna comprises at least two annular insulating supports, a first upper support 4b comprising the coil 3b on one of its parallel faces, a portion 6b of the shielding being on the other face, and a second lower support 9b com carrying only a portion 5b of the shielding
- the antenna 1 has a generally continuous and block shape which gives it very good geometric stability It consists of several cards made of insulating material, three in Figure 2 or two preferably in Figures 5 and 6.
- the turn is identical to the turn of the previous example. However, there are differences in the support and the side walls of the shield.
- the supports are continuous cards while the side walls are made up of a plurality of metal vias 7a and 8a connecting the two rings 5a and 6a.
- These vias or crosspieces are distributed on either side of the turn 3a along the latter (FIG. 9).
- these vias are spaced as small as possible so as to be effective at low frequencies. In the example, this distance is equal to 2.5 mm, the diameter of the vias being 0.5 m; this distance gives the antenna a good efficiency / solidity ratio in this example, which relates to the reading of smart cards without co ⁇ ctact.
- the vias pass through the cards 9a, 12a and electrically connect the lateral edges of the metal rings of the shield.
- the card 12a carrying the turn can be produced from two separate cards 4a, 10a (FIG. 6) assembled by bonding subsequently or else from a single card 12a, while the other card 9a carries only a lower portion of the shield 5a.
- the coil 3a and the ring 6a are first produced on the same circuit board with a primed circuit 12a, while the other ring is also produced in printed circuit on another card.
- These cards 9a and 12a are then assembled, for example by gluing.
- holes are drilled all along the lateral edges of the metal rings in which vias 7a, 8a are produced, such as those commonly used in the production of printed circuits.
- These vias can be replaced by any kind of elongated metallic element ensuring the same electrical connection function, for example hollow or solid rivets.
- the plurality of vias constitutes an perforated wall of the shielding in the same way as a braid of a coaxial; it therefore performs a similar function.
- the rigidity and the geometrical stability of the printed circuit boards one obtains a particularly stable and reproducible antenna.
- the location 14a of the connection is made as well as the location of the tuning circuit 1 3a on the same support as that of the antenna.
- FIG. 7 illustrates the metallizations produced on three cards 10a, 4a and 9a in a primed circuit. At least three metallizations are necessary: a metallization for the upper ring of the shield 6a and for complementary circuit elements 1 3a such as the location of a tuning circuit 14a and a connector 15a, another metallization 3a for the turn, and a final one for the ring 6a and the complementary circuit elements 1 3a above.
- the card can include holes 16a allowing subsequent insertion of metal inserts such as spacers.
- FIG. 8 illustrates the three printed circuit boards 4a
- an antenna device 30 with magnetic field com carries a printed circuit antenna 2.
- the antenna is the antenna according to the invention.
- the antenna is equipped with its tuning circuit 23 and a connector 24.
- the device 30 com also carries a shield with the aid of a material capable of channeling the electromagnetic waves such as for example a ferrite plate 18 consisting of a set of flat ferrite bars 1 9 arranged one against the other. the other and an electromagnetic wave screen such as a steel plate 20.
- a material capable of channeling the electromagnetic waves such as for example a ferrite plate 18 consisting of a set of flat ferrite bars 1 9 arranged one against the other. the other and an electromagnetic wave screen such as a steel plate 20.
- the ferrite assembly and the screen are successively arranged below the antenna 2 in FIG. 10, they must be interposed between the antenna and the metallic environment. Such an arrangement makes it possible to isolate the antenna from a metallic environment which could disturb it.
- the ferrite assembly 1 8 is isolated from the antenna 2 of the invention using a sheet 21 of a non-magnetic compressible material capable of damping mechanical vibrations or shocks.
- a sheet 21 of a non-magnetic compressible material capable of damping mechanical vibrations or shocks.
- the same material in the form of a sheet or a layer 22, is disposed between the screen 20 and the ferrite assembly.
- the material can be compact, such as rubber or neoprene foam. In the example, we used foam sheets
- Neoprene advantageously comprising adhesive faces so as to facilitate assembly.
- the antenna device 30 can also include distance adjustment means 25 making it possible to more precisely control the distances between the different layers formed by the antenna in printed circuit, the ferrite and the screen. It can also include clamping means 26, 27 making it possible to control the damping and the clamping of the layers together.
- the antenna device 30 comprises spacer briquettes 25 made of a denser material than the foam, for example ten times denser and therefore ten times less compressible under the same pressure, the latter being arranged laterally between the steel screen 20 and the printed circuit 2 so as to maintain a substantially constant distance between them.
- the briquettes 25 may have orifices to allow the passage of the following clamping means.
- the antenna device preferably comprises assembly and clamping means constituted in the example by four screws 26 and corresponding nuts 27 arranged at the four angles of the antenna 2, the nuts being fixed integrally on the screen. Alternatively, sockets 27 can be used which have the function of nut and spacer. So by tightening the screws completely you always have the same spacing and the same compression of the sheets.
- the antenna 2 may also include annular metal inserts 28 which serve both as a washer for the screws 26 and which have a spacer function for the printed circuit board.
- the antenna can include a sole 29 of flexible non-magnetic material such as rubber on which the complete antenna can bear while being isolated from the vibrations of the receiving support.
- the antenna is geometrically stable, since it is not disturbable by shocks or vibrations.
- the brittle elements being protected it offers excellent mechanical resistance.
- the adjustable capacities of the tuning circuit can also be chosen with a very fine adjustment.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002270197A CA2270197A1 (fr) | 1996-10-25 | 1997-10-27 | Antenne de champ magnetique blindee en circuit imprime |
US09/284,899 US6215455B1 (en) | 1996-10-25 | 1997-10-27 | Armored magnetic field antenna in printed circuit |
JP10520122A JP2001502832A (ja) | 1996-10-25 | 1997-10-27 | プリント回路のシールドされた磁場アンテナ |
EP97912266A EP0934610A1 (fr) | 1996-10-25 | 1997-10-27 | Antenne de champ magnetique blindee en circuit imprime |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR96/13377 | 1996-10-25 | ||
FR9613377A FR2755303A1 (fr) | 1996-10-25 | 1996-10-25 | Antenne de champ magnetique blindee en circuit imprime |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998019361A1 true WO1998019361A1 (fr) | 1998-05-07 |
Family
ID=9497269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/001925 WO1998019361A1 (fr) | 1996-10-25 | 1997-10-27 | Antenne de champ magnetique blindee en circuit imprime |
Country Status (6)
Country | Link |
---|---|
US (1) | US6215455B1 (fr) |
EP (1) | EP0934610A1 (fr) |
JP (1) | JP2001502832A (fr) |
CA (1) | CA2270197A1 (fr) |
FR (1) | FR2755303A1 (fr) |
WO (1) | WO1998019361A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002063552A (ja) * | 2000-08-22 | 2002-02-28 | Matsushita Electric Ind Co Ltd | 非接触icカード読取/書込装置 |
GB2373099A (en) * | 2001-03-05 | 2002-09-11 | Nokia Mobile Phones Ltd | Multilayer antenna |
EP1665459A2 (fr) * | 2003-05-01 | 2006-06-07 | MeadWestvaco Corporation | Appareil et procede de production d'une antenne a symetriseur integre |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6215454B1 (en) | 1998-02-20 | 2001-04-10 | Qualcomm, Inc. | Multi-layered shielded substrate antenna |
US6304223B1 (en) * | 1999-05-12 | 2001-10-16 | Cubic Corporation | Contactless card automatic check-in check-out device |
GB0105251D0 (en) | 2001-03-02 | 2001-04-18 | Nokia Mobile Phones Ltd | Antenna |
EP1239539A3 (fr) * | 2001-03-02 | 2003-11-05 | Nokia Corporation | Antenne |
JP2004364199A (ja) * | 2003-06-06 | 2004-12-24 | Sony Corp | アンテナモジュール及びこれを備えた携帯型通信端末 |
JP2005026743A (ja) | 2003-06-30 | 2005-01-27 | Matsushita Electric Ind Co Ltd | アンテナ一体型非接触icカード読取/書込装置 |
JP2005033413A (ja) * | 2003-07-10 | 2005-02-03 | Matsushita Electric Ind Co Ltd | ループアンテナ及び非接触icカード読取/書込装置 |
US20050237241A1 (en) * | 2004-04-27 | 2005-10-27 | Garber Richard S | Antenna for radio frequency identification reader |
US7777685B2 (en) * | 2006-09-29 | 2010-08-17 | Alcatel-Lucent Usa Inc. | Small spherical antennas |
JP2010008282A (ja) * | 2008-06-27 | 2010-01-14 | Toshiba Corp | 磁界プローブ、電流分布測定装置および無線装置 |
WO2010038599A1 (fr) * | 2008-10-01 | 2010-04-08 | Semiconductor Energy Laboratory Co., Ltd. | Dispositif à semi-conducteur |
JP5200869B2 (ja) * | 2008-11-12 | 2013-06-05 | 富士ゼロックス株式会社 | 平面検出器および媒体検出装置 |
US11357417B2 (en) | 2012-01-19 | 2022-06-14 | Cerebrotech Medical Systems, Inc. | Continuous autoregulation system |
CA3044306A1 (fr) * | 2012-01-19 | 2013-07-25 | Cerebrotech Medical Systems, Inc. | Systeme de diagnostic pour detecter des changements dans un fluide |
US10743815B2 (en) | 2012-01-19 | 2020-08-18 | Cerebrotech Medical Systems, Inc. | Detection and analysis of spatially varying fluid levels using magnetic signals |
US9065169B2 (en) | 2013-06-25 | 2015-06-23 | University Of New Hampshire | High frequency magnetic field antenna |
CN205211950U (zh) * | 2014-01-30 | 2016-05-04 | 株式会社村田制作所 | 无线通信装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4083006A (en) * | 1973-07-10 | 1978-04-04 | Agency Of Industrial Science & Technology | Loop type standard magnetic field generator |
US4288794A (en) * | 1979-12-26 | 1981-09-08 | Textron Inc. | Shielded loop VOR/ILS antenna system |
US5248989A (en) * | 1988-02-04 | 1993-09-28 | Unisan Ltd. | Magnetic field concentrator |
US5257033A (en) * | 1991-04-16 | 1993-10-26 | Design Tech International, Inc. | Transmitter with a reduction of power of signals transmitted at harmonics |
FR2745928A1 (fr) * | 1996-03-11 | 1997-09-12 | Gemplus Card Int | Dispositif d'echange d'informations sans contact avec un ticket electronique |
-
1996
- 1996-10-25 FR FR9613377A patent/FR2755303A1/fr not_active Withdrawn
-
1997
- 1997-10-27 CA CA002270197A patent/CA2270197A1/fr not_active Abandoned
- 1997-10-27 JP JP10520122A patent/JP2001502832A/ja active Pending
- 1997-10-27 US US09/284,899 patent/US6215455B1/en not_active Expired - Fee Related
- 1997-10-27 EP EP97912266A patent/EP0934610A1/fr not_active Withdrawn
- 1997-10-27 WO PCT/FR1997/001925 patent/WO1998019361A1/fr not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4083006A (en) * | 1973-07-10 | 1978-04-04 | Agency Of Industrial Science & Technology | Loop type standard magnetic field generator |
US4288794A (en) * | 1979-12-26 | 1981-09-08 | Textron Inc. | Shielded loop VOR/ILS antenna system |
US5248989A (en) * | 1988-02-04 | 1993-09-28 | Unisan Ltd. | Magnetic field concentrator |
US5257033A (en) * | 1991-04-16 | 1993-10-26 | Design Tech International, Inc. | Transmitter with a reduction of power of signals transmitted at harmonics |
FR2745928A1 (fr) * | 1996-03-11 | 1997-09-12 | Gemplus Card Int | Dispositif d'echange d'informations sans contact avec un ticket electronique |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002063552A (ja) * | 2000-08-22 | 2002-02-28 | Matsushita Electric Ind Co Ltd | 非接触icカード読取/書込装置 |
JP4588180B2 (ja) * | 2000-08-22 | 2010-11-24 | パナソニック株式会社 | 非接触icカード読取/書込装置 |
GB2373099A (en) * | 2001-03-05 | 2002-09-11 | Nokia Mobile Phones Ltd | Multilayer antenna |
EP1665459A2 (fr) * | 2003-05-01 | 2006-06-07 | MeadWestvaco Corporation | Appareil et procede de production d'une antenne a symetriseur integre |
EP1665459A4 (fr) * | 2003-05-01 | 2006-11-22 | Meadwestvaco Corp | Appareil et procede de production d'une antenne a symetriseur integre |
Also Published As
Publication number | Publication date |
---|---|
EP0934610A1 (fr) | 1999-08-11 |
CA2270197A1 (fr) | 1998-05-07 |
US6215455B1 (en) | 2001-04-10 |
FR2755303A1 (fr) | 1998-04-30 |
JP2001502832A (ja) | 2001-02-27 |
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