EP2065973A1 - Mit Entkopplungsmitteln angeordnete magnetische Heizung - Google Patents

Mit Entkopplungsmitteln angeordnete magnetische Heizung Download PDF

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Publication number
EP2065973A1
EP2065973A1 EP07121720A EP07121720A EP2065973A1 EP 2065973 A1 EP2065973 A1 EP 2065973A1 EP 07121720 A EP07121720 A EP 07121720A EP 07121720 A EP07121720 A EP 07121720A EP 2065973 A1 EP2065973 A1 EP 2065973A1
Authority
EP
European Patent Office
Prior art keywords
radiator
magnetic
elements
radiator elements
decoupling
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Withdrawn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
EP07121720A
Other languages
English (en)
French (fr)
Inventor
Pieter Benthem
Johan Booij
Frans Philip Schreuder
Johan Marinus Vissia
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.)
Stichting ASTRON
Original Assignee
Stichting ASTRON
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 Stichting ASTRON filed Critical Stichting ASTRON
Priority to EP07121720A priority Critical patent/EP2065973A1/de
Publication of EP2065973A1 publication Critical patent/EP2065973A1/de
Withdrawn legal-status Critical Current

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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
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • 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 magnetic radiator, as may be used in a portal article detection means.
  • the invention further relates to an article detection system.
  • the magnetic radiator may be composed of a suitable plurality of radiator elements, which may be used to provide a single detection port bar, wherein said radiator elements are arranged consecutively, for example in a vertical order.
  • the radiator elements generate respective magnetic fields.
  • a magnetic field generated by a first radiator element will induce voltage in other radiator elements positioned in its vicinity.
  • phase of the other radiator elements will be influenced in such a way that, for example, the phase will be equal and/or opposite to the phase of the first radiator element.
  • the phase of the radiator element is defined by the radiator elements source.
  • radiator elements may be desirable to control radiator elements separately, for example to alter phase and the amplitude of one radiator element without altering radiation parameters of the other radiator elements.
  • radiator elements that mutual coupling of radiator elements constituting a magnetic radiator can make it impossible to control the radiator elements separately. More particularly, if the magnetic radiators are in resonance on a certain frequency, the mutual coupling may alter the resonance frequency into multiple resonant frequencies, which is undesirable. This is undesirable because it is important to control each radiator element separately, in such a way that radiator elements positioned in each other's vicinity have a minimal influence on an individual resonance frequency of each radiator element constituting the magnetic radiator.
  • the magnetic radiator according to the invention comprises an electronic component arranged in electrical connection between said radiator elements for substantially decoupling the radiator elements.
  • the technical measure of the invention is based on the following insights, which shall be explained with respect to an equivalent circuit of the magnetic radiator comprising three radiator elements implemented as three inductors L 1 , L 2 , L 3 . It will be appreciated that the inventive insight are applicable to any number of inductors. If the coupling factor between two certain radiator elements is negative, the equivalent inductance L ij will have a negative value too. A similar effect can be created by altering the polarity of the radiator elements. If one of the elements has an inverted polarity, the coupling factors to this particular element will be inverted as well.
  • the electronic component is selected to decouple the radiator elements on the resonant frequency of the radiator. More preferably, the electronic component is selected to decouple the radiator elements over a broad frequency band containing the resonant frequency of the radiator.
  • the decoupling circuit may be resonant on a certain frequency, range of frequencies or not resonant at all. In case of a decoupling circuit containing mainly inductive components a non resonant decoupling circuit will be realized.
  • the decoupling circuit may also contain a combination of capacitive and inductive components, either in series or parallel or a combination of both to obtain the desired decoupling impedance.
  • This may be implemented by using a tunable electronic component which may be tuned in operation for compensating either any drift of the working frequency or a purposeful alteration of the working frequency.
  • a tunable electronic component which may be tuned in operation for compensating either any drift of the working frequency or a purposeful alteration of the working frequency.
  • the decoupling can be controlled in a broad band of useful frequencies.
  • the radiator elements and the electronic component are arranged on a common printed circuit. This has an advantage of increased durability of the circuit.
  • the printed circuit may comprise suitable control unit and microprocessor for enabling alteration of decoupling as a function of selected frequency in use.
  • suitable control unit and microprocessor for enabling alteration of decoupling as a function of selected frequency in use.
  • tunable circuits are mechanically trimmed capacitors and inductors, varicaps or multiple capacitive and / or inductive components with switching elements to alter the total impedance of the decoupling circuit.
  • the article detection system comprises portal means arranged with the magnetic radiator as is set forth in the foregoing.
  • Figure 1 presents in a schematic way coupling effects arising in a magnetic radiator comprising radiator elements.
  • Figure 2 presents in a schematic way an equivalent electrical circuit for a magnetic radiator comprising three radiator elements.
  • Figure 3 presents in a schematic way respective equivalent electrical circuits for magnetic radiators comprising three and four radiator elements.
  • Figure 4 presents the circuits of Figure 3 , wherein electronic component is arranged for decoupling only adjacent radiator elements.
  • FIG. 1 presents in a schematic way coupling effects arising in a magnetic radiator comprising radiator elements.
  • a magnetic radiator having three radiator elements is shown.
  • the radiator elements may be arranged within the magnetic radiator so that either a negative or a positive coupling between the radiator elements occurs.
  • Elements 1, 2, 3 represent a set-up wherein respective radiator elements are negatively coupled, i.e. coupling factors k 12 , k 23 , k 13 are negative, due to the fact that magnetic fields B 12 , B 23 , B 13 are counter-aligned.
  • the elements 1', 2', 3' are arranged in such a way that individual magnetic fields (not shown) align resulting in a co-aligned net magnetic field B. In this case the coupling factors k 12 , k 3 , k 13 (not indicated) are positive.
  • the values of the inductors L 11 , L 22 and L 33 are equal or close to L 1 , L 2 and L 3 .
  • Three inductors can be placed between the ports of the radiator elements L 1 , L 2 and L 3 thereby effectively decoupling radiator elements of the magnetic radiator by compensating mutual coupling only between adjacent radiator elements. It shall be appreciated that the same approach is applicable for any number of radiator elements constituting a magnetic radiator.
  • Figure 3 presents in a schematic view 30 of respective equivalent electrical circuits 31, 32 for magnetic radiators comprising three and four radiator elements, respectively.
  • equivalent electric circuit 31 mutual coupling between radiator elements is illustrated by electric components -L 12 , - L 23 , -L 13 .
  • an equivalent negative inductances may be compensated by using a positive inductive element in the real electrical circuit.
  • the equivalent inductance is positive, it can be compensated by providing a real capacitive element connected in parallel to corresponding portions of the equivalent circuit. In these ways coupling effects are minimized.
  • the equivalent circuit 32 representing a configuration where four radiator elements are used the following equivalent electronic components (negative inductances) are shown: -L 12 , -L 23 , -L 34 , -L 13 , -L 24 , -L 14 .
  • the electronic component necessary to compensate for effects caused by the equivalent electronic components comprised a set of sub-components L 12 , L 23 , L 13 or L 12 , L 23 , L 34 , L 13 , L 24 , L 14 for effectively decoupling radiator elements constituting a suitable magnetic radiator.
  • FIG 4 presents a schematic view 40 of the circuits of Figure 3 , wherein electronic component is arranged for decoupling only adjacent radiator elements.
  • the electronic component comprises sub-components -L 12 , -L 23 or -L 12 , -L 23 , -L 34 .
  • the present embodiment is based on the insight that a coupling factor between adjacent radiator elements are substantially larger that the coupling factors between non-adjacent radiator elements. For this reason it is found to be sufficient to substantially mitigate coupling effects in a magnetic resonator comprising a plurality of radiator elements by placing the decoupling electronic component only between adjacent radiator elements.
  • equivalent negative inductances may be compensated by using a positive inductive element in the real electrical circuit. In case when the equivalent inductance is positive, it can be compensated by providing a real capacitive element connected in parallel to corresponding portions of the equivalent circuit. In these ways coupling effects are minimized.

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  • Magnetic Resonance Imaging Apparatus (AREA)
EP07121720A 2007-11-28 2007-11-28 Mit Entkopplungsmitteln angeordnete magnetische Heizung Withdrawn EP2065973A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07121720A EP2065973A1 (de) 2007-11-28 2007-11-28 Mit Entkopplungsmitteln angeordnete magnetische Heizung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07121720A EP2065973A1 (de) 2007-11-28 2007-11-28 Mit Entkopplungsmitteln angeordnete magnetische Heizung

Publications (1)

Publication Number Publication Date
EP2065973A1 true EP2065973A1 (de) 2009-06-03

Family

ID=39167559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121720A Withdrawn EP2065973A1 (de) 2007-11-28 2007-11-28 Mit Entkopplungsmitteln angeordnete magnetische Heizung

Country Status (1)

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EP (1) EP2065973A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014796A (en) * 1978-02-17 1979-08-30 Lichtblau G J Antenna system for electronic security installation
US5151709A (en) * 1989-10-10 1992-09-29 Motorola, Inc. Tunable superconductive antenna
US5592182A (en) * 1995-07-10 1997-01-07 Texas Instruments Incorporated Efficient, dual-polarization, three-dimensionally omni-directional crossed-loop antenna with a planar base element
US5602556A (en) * 1995-06-07 1997-02-11 Check Point Systems, Inc. Transmit and receive loop antenna
US5650791A (en) * 1995-09-05 1997-07-22 Ford Motor Company Multiband antenna for automotive vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014796A (en) * 1978-02-17 1979-08-30 Lichtblau G J Antenna system for electronic security installation
US5151709A (en) * 1989-10-10 1992-09-29 Motorola, Inc. Tunable superconductive antenna
US5602556A (en) * 1995-06-07 1997-02-11 Check Point Systems, Inc. Transmit and receive loop antenna
US5592182A (en) * 1995-07-10 1997-01-07 Texas Instruments Incorporated Efficient, dual-polarization, three-dimensionally omni-directional crossed-loop antenna with a planar base element
US5650791A (en) * 1995-09-05 1997-07-22 Ford Motor Company Multiband antenna for automotive vehicle

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