EP1695415A1 - Antenne plane à champ tournant, comportant une boucle centrale et des boucles excentriques, et système d'identification par radiofrequence - Google Patents
Antenne plane à champ tournant, comportant une boucle centrale et des boucles excentriques, et système d'identification par radiofrequenceInfo
- Publication number
- EP1695415A1 EP1695415A1 EP04805610A EP04805610A EP1695415A1 EP 1695415 A1 EP1695415 A1 EP 1695415A1 EP 04805610 A EP04805610 A EP 04805610A EP 04805610 A EP04805610 A EP 04805610A EP 1695415 A1 EP1695415 A1 EP 1695415A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- loops
- antenna
- eccentric
- central loop
- eccentric loops
- 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.)
- Granted
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
Definitions
- the invention relates to a substantially planar rotating field antenna comprising a central loop and eccentric coplanar loops.
- Radio frequency identification systems allow contactless data exchange by inductive coupling between a reading unit and objects to be identified, conventionally labels.
- the energy required for the labels is drawn from the electromagnetic field.
- the reading unit emits an electromagnetic field in an exchange zone limited by the transmission power of the reading unit.
- the information is transmitted between the reading unit and the label by modulation of the electromagnetic field. Due to the shape of the field lines, the exchange of information can only be done for particular relative positions of the labels relative to an antenna of the reading unit.
- a reading unit provided with an antenna having a single planar loop allows the transfer of information in the center of the antenna to a correctly oriented label, in particular if it is parallel to the plane of the antenna loop.
- the inductive coupling between the antenna and a label positioned in a plane orthogonal to the plane of the loop is weaker and often insufficient for detect the label. This is due to the fact that the magnetic field lines are, at the center of the antenna, perpendicular to the plane of the loop and, thus, the flux passing through the label is minimal when the label is placed in a plane perpendicular to the plane of the loop. On the contrary, when the label is parallel to the plane of the loop, the flux passing through the label is maximum.
- the emission power is limited by the field level to a distance of 10 m from the antenna, which limits the possibility of compensating for an angle. the label tilted by a more intense field.
- US Pat. No. 6,166,706 describes a substantially planar rotating field antenna comprising a central loop and two eccentric coplanar loops. The two eccentric loops are connected and supplied in parallel. The central antenna is supplied, in phase quadrature, by inductive coupling with the eccentric loops. The antenna thus produces a rotating field in a plane orthogonal to the plane of the antenna. A label placed in this plane cannot be detected.
- US5005001 and US6650213 The document US5005001 describes an antenna system comprising first rectangular coils, arranged face to face so as to form a portal, for generating a non-rotating magnetic field.
- the system includes means for creating a rotating magnetic field using two pairs of additional coils disposed respectively in the same plane as the first coils, inside thereof. The two additional coils of each pair are connected so that the same current flows through them with a phase shift of 180 °.
- the document US5005001 describes two rotating field antennas, substantially flat and arranged face to face. Each antenna has a peripheral loop and two internal coplanar loops.
- Document US6650213 describes an antenna consisting of a set of four adjacent co-planar coils.
- a magnetic field control element makes it possible to control the polarity and the phase of the magnetic field generated by each coil, so as to modify the direction of the magnetic field near the set of coils, to guide a spherical semiconductor element in direction of the whole.
- Two adjacent coils are positively biased and the other two coils are negatively biased.
- the object of the invention is to remedy these drawbacks and, in particular, to produce a planar antenna making it possible to detect a radio frequency identification label having any orientation, while limiting the field level to a distance of 10 m from the 'antenna.
- the central loop creating a magnetic field mainly perpendicular to the antenna the antenna comprises four loops adjacent coplanar eccentrics, supplied so as to create a field rotating mainly in a plane parallel to the plane of the antenna, the centers of gravity of the eccentric loops being arranged substantially on the periphery of the central loop.
- Another object of the invention is a radiofrequency identification system comprising a rotating field antenna and a radiofrequency generator comprising first and second outputs providing, alternately, first and second excitation signals respectively to the central loop and to the loops eccentric.
- FIGS 1 and 2 schematically illustrate two particular embodiments of an antenna according to the invention.
- FIG. 3 represents a particular embodiment of two eccentric loops associated with an antenna according to the invention.
- FIG. 4 represents a particular embodiment of an identification system according to the invention.
- FIG. 5 schematically represents a particular embodiment of means of phase shifting of an identification system according to the invention. Description of particular embodiments
- a rotating field antenna has a central loop 1, substantially rectangular, and four eccentric loops 2 (2a, 2b, 2c, 2d) adjacent coplanar.
- the eccentric loops 2 and the central loop 1 are substantially arranged in the same plane.
- the antenna is then substantially flat.
- the four eccentric loops (2) can be arranged symmetrically with respect to the center of the central loop.
- the four eccentric loops 2 can be supplied in such a way that two adjacent eccentric loops 2 have a phase shift of 90 ° and, thus, two non-adjacent eccentric loops 2 have a phase shift of 180 °.
- the superimposed fields of the four eccentric loops 2 create a magnetic field rotating mainly in a plane parallel to the plane of the antenna.
- the central loop 1 creates, independently of the eccentric loops 2, a magnetic field mainly perpendicular to the antenna, having a maximum in a central zone 3a shown in dotted lines, extending in volume perpendicular to the plane of the antenna.
- the centers of gravity G (Ga, Gb, Gc, Gd) of the eccentric loops 2 are arranged substantially on the periphery of the central loop 1.
- the field rotating in the plane of the antenna created by the eccentric loops, has a maximum in the central zone 3a.
- the antenna makes it possible to detect a label positioned in any direction and arranged in the exchange zone formed by the central zone 3a and the peripheral zone 3b.
- the components of the magnetic field perpendicular to the plane of the antenna make it possible to detect labels arranged in a plane parallel to the antenna, while the components of the magnetic field arranged in the plane of the antenna make it possible to detect labels arranged in a plane orthogonal to the plane of the antenna.
- the eccentric loops 2 are substantially rectangular.
- the shape of the loops constituting the antenna influences the distribution of the magnetic field.
- a triangular shape of the eccentric loops 2 is more suitable than a rectangular or square shape. Indeed, for the same surface, a triangular loop creates more horizontal field lines than a square loop.
- the eccentric loops 2 are substantially triangular, one vertex of each triangle being disposed in the central area 3a of the antenna.
- other forms can be considered such as, for example, a circular central loop 1 and eccentric loops 2 in the form of a sector of a circle.
- the eccentric loops 2 are associated by pairs of non-adjacent loops (their connection is represented schematically by a single line 4), so as to generate, in said pair, electromagnetic fields of opposite phases.
- two eccentric loops 2a and 2c are constituted by a conductor 5 arranged in the form of 8.
- the conductor 5 is supplied by terminals 6 common to the two loops 2a and 2c.
- an electric current I first flows through the first loop 2a of the conductor 5 in a first direction and then automatically the second loop 2c of the conductor 5 in a second direction, opposite to the first.
- the two loops 2a and 2c are then connected so that the same current flows through them in opposite trigonometric directions.
- the set of four eccentric loops 2 can thus be constituted by an assembly of two conductors 5 superimposed substantially in the same plane, with an offset of 90 ° in this plane. It is nevertheless necessary to position the two conductors 5 at a minimum distance to limit the capacitive couplings. In addition, the distance of the two conductors 5 makes it possible to increase the volume of the rotating field.
- a radiofrequency identification system comprises, in addition to the rotating field antenna, a radiofrequency generator 7.
- the generator 7 has a first output 8 and a second output 9 providing, alternately, first S1 and second S2 excitation signals, respectively to the central loop 1 and to the eccentric loops 2.
- the rotating field created by the eccentric loops 2 does not interfere with the field created by the central loop 1. Indeed, the simultaneous feeding of the central loop 1 and the eccentric loops 2 can create, by destructive interference, minima of magnetic field in the central zone 3a and the peripheral zone 3b.
- the fields can be rotated so that they scan the exchange zone. This can, for example, be achieved if the first S1 and second S2 excitation signals have slightly different frequencies. For example, for a radio frequency identification operation at 13.56 MHz, it is theoretically possible to have a frequency offset of 7 kHz. In practice, given the noise and the margins taken for proper operation, this offset is reduced to 1 kHz or 2 kHz. This solution is therefore preferably accompanied by an efficient software processing taking into account the time of presence of the labels in the field, typically of the order of a few milliseconds. As shown in FIG.
- the phase quadrature phase shift of the adjacent eccentric loops 2d and 2c can be ensured by a power divider 10, phase shifter, respectively supplying signals S3 and S4 in phase quadrature on its two outputs 11 and 12
- An input 13 of the power divider 10 is preferably connected to the second output 9 of the radio frequency generator 7.
- the eccentric loops 2 shown in FIG. 5 are also associated in pairs (2a and 2c, 2b and 2d).
- the two loops of a pair can, as shown in Figure 3, be connected to each other and to common terminals 6, so that the same current I flows through them in trigonometric directions opposed.
- the signals S3 and S4 are applied respectively to the common terminals 6 of each of the two pairs.
- each eccentric loop 2 is supplied with phase quadrature with respect to its two neighboring loops.
- the dimensions of the antenna depend on the application for which it is intended. For an application in a near field identification system, a surface of 10 cm ⁇ 15 cm is sufficient and makes it possible to generate a three-dimensional magnetic field greater than 5 A / m in the central zone 3a and the peripheral zone 3b in the plane of the antenna, while respecting international standards for radiofrequency radiation emission.
- a larger surface area for example, of the order of 25 cm ⁇ 25 cm, is suitable.
- a mobile phone with an electromagnetic induction charging module can be recharged by placing it on the antenna, regardless of its orientation.
- an area of 1 m 2 is necessary.
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0314781A FR2864354B1 (fr) | 2003-12-17 | 2003-12-17 | Antenne plane a champ tournant, comportant une boucle centrale et des boucles excentrees, et systeme d'identification par radiofrequence |
| PCT/FR2004/003090 WO2005069440A1 (fr) | 2003-12-17 | 2004-12-02 | Antenne plane à champ tournant, comportant une boucle centrale et des boucles excentrees, et systeme d’identification par radiofrequence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1695415A1 true EP1695415A1 (fr) | 2006-08-30 |
| EP1695415B1 EP1695415B1 (fr) | 2013-10-09 |
Family
ID=34630231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04805610.5A Expired - Lifetime EP1695415B1 (fr) | 2003-12-17 | 2004-12-02 | Antenne plane à champ tournant, comportant une boucle centrale et des boucles excentriques, et système d'identification par radiofrequence |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7579994B2 (fr) |
| EP (1) | EP1695415B1 (fr) |
| JP (1) | JP4874120B2 (fr) |
| FR (1) | FR2864354B1 (fr) |
| WO (1) | WO2005069440A1 (fr) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1932213B1 (fr) | 2005-09-12 | 2020-11-25 | Sato Holdings Corporation | Conception d'antenne et systeme d'interrogation |
| US7733290B2 (en) * | 2005-12-19 | 2010-06-08 | Sensormatic Electronics, LLC | Merchandise surveillance system antenna and method |
| EP1993167A1 (fr) * | 2007-05-16 | 2008-11-19 | Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO | Antenne pour étiquette RFID |
| GB0724704D0 (en) * | 2007-12-19 | 2008-01-30 | Rhodes Mark | Antenna formed of multiple planar arrayed loops |
| US7796041B2 (en) * | 2008-01-18 | 2010-09-14 | Laird Technologies, Inc. | Planar distributed radio-frequency identification (RFID) antenna assemblies |
| US8264342B2 (en) * | 2008-10-28 | 2012-09-11 | RF Surgical Systems, Inc | Method and apparatus to detect transponder tagged objects, for example during medical procedures |
| US9847576B2 (en) * | 2013-11-11 | 2017-12-19 | Nxp B.V. | UHF-RFID antenna for point of sales application |
| KR102257892B1 (ko) * | 2014-11-26 | 2021-05-28 | 삼성전자주식회사 | 개선된 nfc 안테나 및 그 안테나를 갖는 전자 장치 |
| FR3030906B1 (fr) | 2014-12-17 | 2016-12-23 | Continental Automotive France | Unite electronique d'emissions basse frequence a destination d'une unite electronique de roue mobile d'un vehicule et procede de transmission de signaux basse frequence associe |
| CN207517887U (zh) * | 2015-02-24 | 2018-06-19 | 株式会社村田制作所 | 天线装置以及rfid系统 |
| JP6392715B2 (ja) * | 2015-08-17 | 2018-09-19 | 日本電信電話株式会社 | ループアンテナアレイ群 |
| CN106252834B (zh) * | 2016-09-09 | 2022-11-18 | 爱康普科技(大连)有限公司 | 天线及标签读取设备 |
| EP3570371A1 (fr) * | 2018-05-14 | 2019-11-20 | Nxp B.V. | Dispositif d'antenne rf planaire à caractéristique 3d |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4480255A (en) * | 1982-12-06 | 1984-10-30 | Motorola Inc. | Method for achieving high isolation between antenna arrays |
| FR2615040B1 (fr) * | 1987-05-07 | 1990-02-16 | Thomson Cgr | Antenne de reception a decouplage passif notamment pour appareil d'imagerie par resonnance magnetique nucleaire |
| US5005001A (en) * | 1990-04-05 | 1991-04-02 | Pitney Bowes Inc. | Field generation and reception system for electronic article surveillance |
| KR0132644B1 (ko) * | 1994-04-28 | 1998-04-20 | 오상세 | 고상선륜(D)과 환상선륜(R)의 공윤선륜에 루프코일(loop coil)을 권선하는 방법 |
| AU702622B2 (en) * | 1995-05-30 | 1999-02-25 | Sensormatic Electronics Corporation | EAS system antenna configuration for providing improved interrogation field distribution |
| WO1999035610A1 (fr) * | 1998-01-12 | 1999-07-15 | Sentec Ltd. | Etiquetage magnetique comprenant des donnees |
| US6650213B1 (en) * | 2000-06-02 | 2003-11-18 | Yamatake Corporation | Electromagnetic-induction coupling apparatus |
| DE20012099U1 (de) | 2000-07-12 | 2000-12-07 | N.V. Nederlandsche Apparatenfabriek Nedap, Groenlo | Antenne eines elektromagnetischen Detektionssystems und elektromagnetisches Detektionssystem, versehen mit einer derartigen Antenne |
| FR2811767B1 (fr) * | 2000-07-13 | 2002-09-20 | Innov Pro | Dispositif permettant d'evaluer la densite des protons presents dans un corps donne |
| US6512494B1 (en) * | 2000-10-04 | 2003-01-28 | E-Tenna Corporation | Multi-resonant, high-impedance electromagnetic surfaces |
| US20030052783A1 (en) * | 2001-09-17 | 2003-03-20 | Sitzman William B. | Dock door RFID system |
| US6822570B2 (en) * | 2001-12-20 | 2004-11-23 | Calypso Medical Technologies, Inc. | System for spatially adjustable excitation of leadless miniature marker |
| US6753821B2 (en) * | 2002-04-22 | 2004-06-22 | Wg Security Products, Inc. | Method and arrangement of antenna system of EAS |
| CA2389791C (fr) * | 2002-06-20 | 2004-10-19 | James Stanley Podger | Elements d'antenne multicadres |
| US7075485B2 (en) * | 2003-11-24 | 2006-07-11 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Low cost multi-beam, multi-band and multi-diversity antenna systems and methods for wireless communications |
-
2003
- 2003-12-17 FR FR0314781A patent/FR2864354B1/fr not_active Expired - Fee Related
-
2004
- 2004-12-02 JP JP2006544486A patent/JP4874120B2/ja not_active Expired - Fee Related
- 2004-12-02 US US10/581,670 patent/US7579994B2/en not_active Expired - Fee Related
- 2004-12-02 WO PCT/FR2004/003090 patent/WO2005069440A1/fr not_active Ceased
- 2004-12-02 EP EP04805610.5A patent/EP1695415B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005069440A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2864354B1 (fr) | 2006-03-24 |
| US20070109210A1 (en) | 2007-05-17 |
| JP4874120B2 (ja) | 2012-02-15 |
| FR2864354A1 (fr) | 2005-06-24 |
| US7579994B2 (en) | 2009-08-25 |
| EP1695415B1 (fr) | 2013-10-09 |
| JP2007519319A (ja) | 2007-07-12 |
| WO2005069440A1 (fr) | 2005-07-28 |
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