EP2048738A1 - Antenne ferrite magnétique - Google Patents

Antenne ferrite magnétique Download PDF

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Publication number
EP2048738A1
EP2048738A1 EP08166210A EP08166210A EP2048738A1 EP 2048738 A1 EP2048738 A1 EP 2048738A1 EP 08166210 A EP08166210 A EP 08166210A EP 08166210 A EP08166210 A EP 08166210A EP 2048738 A1 EP2048738 A1 EP 2048738A1
Authority
EP
European Patent Office
Prior art keywords
antenna
ferrite core
capacity
coil
interrogation field
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Withdrawn
Application number
EP08166210A
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German (de)
English (en)
Inventor
Derk Jan Roosenboom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Publication of EP2048738A1 publication Critical patent/EP2048738A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the invention relates to an antenna, in particular an antenna of a detection system for detecting labels, such as identification labels, provided with a resonant circuit, which responds when introduced into an electromagnetic interrogation field, the antenna being provided with an antenna coil which is provided with multiple turns.
  • the invention further relates to a detection system for detecting labels comprising a resonant circuit which responds when introduced into an electromagnetic interrogation field, such as an identification label, the system being provided with such an antenna and a transmitting and receiving device which is connected with the connection cable of the antenna for generating an electromagnetic interrogation field in a detection zone and for detecting a label which responds when located in the interrogation field.
  • an electromagnetic interrogation field such as an identification label
  • a ferrite antenna is known per se. In use, such a ferrite antenna is connected through a connection cable with a transmitting and/or receiving device and the ferrite antenna is tuned to at least one desired frequency through inclusion of a tuning capacity between the connection cable and the transmitting and receiving device.
  • a disadvantage is that the tuning capacity must then be available between the antenna cable on one side and the transmitting and receiving device on the other.
  • the object of the invention is to provide a magnetic ferrite antenna which, in principle, does not require being, at least substantially, tuned using a capacity situated ⁇ between the connection cable and the transmitting and receiving device, and which moreover allows the antenna to be made of compact design if so desired.
  • the antenna according to the invention is accordingly characterized in that the antenna is further provided with at least one capacity which is electroconductively connected with the antenna coil and which, with the antenna coil, forms an LC circuit for tuning the antenna to at least one particular frequency between 10 kHz and 500 kHz, at which frequency the antenna, in use, functions as a magnetic ferrite antenna.
  • the invention provides a magnetic ferrite antenna which is tuned to at least one particular frequency.
  • the magnetic ferrite antenna in use, can be connected directly to a transmitting and receiving device to obtain a detection system for detecting labels.
  • a detection system which is provided with such an antenna is further provided with at least one capacity and/or at least one self-induction for fine-tuning the antenna, which at least one capacity and/or at least one self-induction is connected near an end of the connection cable connected with the transmitting and receiving device with the connection cable and/or the transmitting and receiving device.
  • the antenna may moreover be made of compact design, if so desired. This is because a length of a turn of a magnetic ferrite antenna is generally smaller than a wavelength associated with the antenna. This wavelength in turn is co-determined by the tuning of the antenna.
  • the ferrite core is made of hollow design, with the at least one capacity being included in a space enclosed by the ferrite core.
  • the antenna can be made particularly compact because on the one hand as a result of the use of the ferrite core the length of the individual turns can be relatively small and functionally corresponds to a much larger turn which is not wound around a ferrite core and because on the other hand the at least one capacity can be included in the ferrite core and hence requires no extra space for the antenna.
  • the antenna is provided with multiple capacities which are electroconductively connected with the antenna coil.
  • the capacities are mutually connected in parallel and/or in series.
  • an axial axis of the helix can for instance be set up vertically, while yet an electromagnetic interrogation field is generated on which labels, for instance worn by an animal, can be detected.
  • an antenna of a detection system known per se for detecting labels in for instance a cowshed where the antenna comprises a relatively large loop, for instance 50 x 100 cm, which is incorporated in a floor of the shed.
  • the ferrite core is composed of multiple ring cores and/or multiple discs.
  • the ferrite core can be manufactured much more economically than when the ferrite core is designed in one piece. This also provides the advantage that the ferrite core will break less easily than when the ferrite core is made in one piece. If the ferrite core is designed in one piece and breaks at least at an arbitrary non predetermined point, this can have an unknown influence on the tuning of the antenna.
  • the ferrite core which is composed of multiple ring cores and/or multiple discs does not have this disadvantage.
  • the ferrite core is composed of multiple ring cores, so that the ferrite core is of hollow design.
  • it holds that the ring cores and/or the discs are stacked in an axial direction of the ferrite core.
  • the ring cores and/or the discs are stacked directly onto each other. Then there is no intermediate space between the ring cores and/or the discs. Preferably, it holds further that the ring cores and/or the discs mutually have at least substantially the same dimensions.
  • a detection system is characterized in that the system is provided with an antenna and a transmitting and receiving device which is connected with the connection cable of the antenna for generating an electromagnetic interrogation field in a detection zone and for detecting a label which responds when located in the interrogation field. It preferably holds here that a wavelength of the transmitted electromagnetic interrogation field is greater than the length of a circumference of a turn of the antenna coil. More particularly, it holds here that the wavelength of the transmitted electromagnetic interrogation field is greater than the length of the circumference of each of the turns of the antenna coil.
  • the system is further provided with at least one capacity and/or self-induction for fine tuning the antenna.
  • Customary frequencies of the antenna and/or the system according to the invention are in the range of 10-500 kHz, in particular in the range of 120-140 kHz.
  • reference numeral 1 designates a detection system for detecting identification labels 2 which comprise a resonant circuit which responds when introduced into an electromagnetic interrogation field.
  • the identification labels are known per se and are for instance used for identifying animals. Such a label may for instance be designed as an ear stud or a bolus.
  • the system is provided with a transmitting and receiving device 4 and a magnetic ferrite antenna 6 connected with the transmitting and receiving device.
  • an electromagnetic interrogation field can be generated in a detection zone 8 for detecting the label 2 located in a detection zone 8.
  • the label responds when located in the electromagnetic interrogation field, for instance by transmitting an identification code which is stored in the label 2. This may involve an absorption system as well as a transmission system.
  • the antenna 6 is provided with a ferrite core 10 which is of hollow design in this example. Furthermore, the antenna 6 is provided with an antenna coil 12 which is provided with multiple turns, circular in this example, which are wound around the ferrite core in the form of a helix. As the turns are wound around a ferrite core, each turn functionally corresponds to a turn which, not wound around a ferrite core, will have a much greater circumference. As a result, the ferrite core antenna can be made of more compact design than an antenna that would not be provided with such a ferrite core.
  • the antenna 6 is further provided with a number of capacities 14 which are included in a hollow space 16 enclosed by the ferrite core 10 and which are electroconductively connected with the antenna coil 12.
  • the antenna coil 12 and the capacities 14 then form an LC circuit.
  • the capacities are here used for tuning the antenna to a particular transmission and reception frequency. This frequency is such that the antenna 6, in use, will function as a magnetic ferrite antenna. This brings with it that an electromagnetic signal transmitted with the antenna has a wavelength that is greater than a length of a turn of the antenna. For this reason, too, at a given wavelength the antenna can be made of compact design.
  • the ferrite antenna is further provided with a connection cable which on one side is electroconductively connected with the antenna coil and which on the other side is connected with the transmitting and receiving device 4.
  • the antenna coil 12 With the transmitting and receiving device 4 an electromagnetic signal is generated which is supplied via the connection cable 18 to the antenna coil 12.
  • the antenna coil 12 has been tuned using the capacities 14, such that it is tuned to the frequency of the electromagnetic transmitted signal that is generated by the transmitting and receiving device. Furthermore, it holds here that the wavelength of the electromagnetic signal that is transmitted is greater than the length of a single turn of the antenna coil.
  • the antenna coil functions as a magnetic antenna. Customary frequencies of the antenna are in the range of 10-500 kHz, in particular in the range of 120-140 kHz.
  • the antenna can still be made of compact design in that the capacities 14 are included in the hollow space of the ferrite core.
  • the capacities are mutually connected in parallel and electroconductively connected with the antenna coil 12.
  • the lengths of the circumference of all individual turns of the antenna are at least substantially equal to each other.
  • the number of turns used may vary. For instance, 10 to 300 turns may be used. However, other numbers are also possible.
  • the detection system is further provided with a capacity and/or self-induction 20 for fine-tuning.
  • This at least one capacity and/or at least one self-induction 20 is situated between the transmitting and receiving device 4 and the connection cable 18. More particularly, it holds that the capacity and/or self-induction is connected with the connection cable and/or the transmitting and receiving device near an end of the connection cable that is connected with the transmitting and receiving device.
  • the relatively compact antenna 6 may for instance be set up vertically in an animal house for detecting animals. It is also possible, however, that the antenna is used for other purposes, such as for instance in shoplifting systems which also detect labels, in the form of antitheft labels.
  • the magnetic ferrite antenna may further be provided with a housing 22, which is indicated in broken lines in Fig. 1 and in this example is designed in the shape of an elongate cylinder.
  • the housing is manufactured from a material, such as for instance a plastic, that is transmissive of electromagnetic radiation of the desired frequency.
  • the ferrite core 10 may be composed of multiple (in this example 12) stacked ring cores 30 jointly forming the ferrite core.
  • the ferrite core may be of non-hollow, that is, solid design. The ferrite core may then be composed of a number of stacked disc-shaped ferrite cores.
  • the ring cores and/or the discs are stacked in an axial direction of the ferrite core. It also appears from the drawing that in this example the ring cores and/or the discs are stacked onto each other. Then there is no intermediate space present between the ring cores and/or the discs. Further, it appears from the drawing that in this example the ring cores and/or the discs mutually have at least substantially the same dimensions.
  • the at least one capacity of the antenna will be disposed at a position outside the ferrite core.
  • the antenna 6 is provided with multiple capacities 14. These capacities may also be connected in series or may also be connected in series and in parallel. It is also conceivable, however, that the antenna is provided with a single capacity 14. The capacity 14 and/or the capacities 14 may be tuned such that the capacity of the connection cable 18 is taken into account. The connection cable 18 and the capacities 14 (and/or the single capacity 14) then form a tuning capacity for tuning the antenna 6 to a desired frequency. Such variations are each understood to fall within the scope of the invention.
EP08166210A 2007-10-09 2008-10-09 Antenne ferrite magnétique Withdrawn EP2048738A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1034493A NL1034493C2 (nl) 2007-10-09 2007-10-09 Magneet ferriet antenne.

Publications (1)

Publication Number Publication Date
EP2048738A1 true EP2048738A1 (fr) 2009-04-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08166210A Withdrawn EP2048738A1 (fr) 2007-10-09 2008-10-09 Antenne ferrite magnétique

Country Status (2)

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EP (1) EP2048738A1 (fr)
NL (1) NL1034493C2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012075851A1 (fr) * 2010-12-07 2012-06-14 北京握奇数据系统有限公司 Antenne de détection et dispositif comprenant une antenne de détection
RU2546542C1 (ru) * 2013-10-04 2015-04-10 Общество с ограниченной ответственностью "Алсет Веллен" Управляемый преселектор, совмещенный с магнитной ферритовой антенной
RU2598312C2 (ru) * 2014-04-29 2016-09-20 Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнёва" Способ беспроводной передачи, приема информации
CN109148096A (zh) * 2018-08-29 2019-01-04 昆山沃京电子有限公司 一种无钥匙进入系统天线的电感器、设计方法及装置
RU2693556C1 (ru) * 2018-12-28 2019-07-03 Арий Борисович Ляско Линейная магнитная антенна для вч диапазона
US11088451B2 (en) 2016-12-21 2021-08-10 Tdk Electronics Ag Antenna segment and multi-segment antenna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053299A (fr) * 1900-01-01
US2895129A (en) * 1956-01-30 1959-07-14 Gen Bronze Corp Mobile radio antenna
EP1450436A1 (fr) * 2001-10-22 2004-08-25 Sumida Corporation Bobine d'antenne et antenne de transmission
US20040198428A1 (en) * 2002-05-31 2004-10-07 Kye Systems Corp. Miniature, high efficiency antenna device for enabling wireless communication with a computer system
WO2006062492A1 (fr) * 2004-12-08 2006-06-15 Alexandr Ivanovich Karpov Antenne de petite taille

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053299A (fr) * 1900-01-01
US2895129A (en) * 1956-01-30 1959-07-14 Gen Bronze Corp Mobile radio antenna
EP1450436A1 (fr) * 2001-10-22 2004-08-25 Sumida Corporation Bobine d'antenne et antenne de transmission
US20040198428A1 (en) * 2002-05-31 2004-10-07 Kye Systems Corp. Miniature, high efficiency antenna device for enabling wireless communication with a computer system
WO2006062492A1 (fr) * 2004-12-08 2006-06-15 Alexandr Ivanovich Karpov Antenne de petite taille

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CROSS: "Time-code receiver clock - 3", WIRELESS WORLD, 1 April 1978 (1978-04-01), pages 56 - 58, XP001386707 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012075851A1 (fr) * 2010-12-07 2012-06-14 北京握奇数据系统有限公司 Antenne de détection et dispositif comprenant une antenne de détection
RU2546542C1 (ru) * 2013-10-04 2015-04-10 Общество с ограниченной ответственностью "Алсет Веллен" Управляемый преселектор, совмещенный с магнитной ферритовой антенной
RU2598312C2 (ru) * 2014-04-29 2016-09-20 Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнёва" Способ беспроводной передачи, приема информации
US11088451B2 (en) 2016-12-21 2021-08-10 Tdk Electronics Ag Antenna segment and multi-segment antenna
CN109148096A (zh) * 2018-08-29 2019-01-04 昆山沃京电子有限公司 一种无钥匙进入系统天线的电感器、设计方法及装置
RU2693556C1 (ru) * 2018-12-28 2019-07-03 Арий Борисович Ляско Линейная магнитная антенна для вч диапазона

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Publication number Publication date
NL1034493C2 (nl) 2009-04-14

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