EP1860733B1 - Elément d'absorption pour rayonnement électromagnétique à haute fréquence - Google Patents

Elément d'absorption pour rayonnement électromagnétique à haute fréquence Download PDF

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Publication number
EP1860733B1
EP1860733B1 EP07010006A EP07010006A EP1860733B1 EP 1860733 B1 EP1860733 B1 EP 1860733B1 EP 07010006 A EP07010006 A EP 07010006A EP 07010006 A EP07010006 A EP 07010006A EP 1860733 B1 EP1860733 B1 EP 1860733B1
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EP
European Patent Office
Prior art keywords
absorption element
element according
radiation
antenna
reflection device
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.)
Not-in-force
Application number
EP07010006A
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German (de)
English (en)
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EP1860733A1 (fr
Inventor
Joachim Cantauw
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Zetes GmbH
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Zetes GmbH
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    • 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
    • H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
    • 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
    • H01Q17/001—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems for modifying the directional characteristic of an aerial
    • 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
    • H01Q17/002—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using short elongated elements as dissipative material, e.g. metallic threads or flake-like particles

Definitions

  • the invention relates to an absorption element for electromagnetic high-frequency radiation, in particular for radiation, as used in the RFID (Radio Frequency Identification) area.
  • RFID Radio Frequency Identification
  • RFID is a technology for non-contact automatic identification of objects via radio detection.
  • data stored on so-called transponders are read without contact and without visual contact.
  • Such transponders can be attached to objects, which are then automatically and quickly identifiable based on the data stored thereon.
  • An RFID reading system stimulates the transponder to transmit the data stored on the transponder by emitting electromagnetic radiation. This technology can be used anywhere where objects must be automatically identified, detected, registered, stored, monitored or transported.
  • the strength of the fields or the frequencies are determined by national and international regulations. For example, for the UHF range, depending on the country and approval, three to approx. Ten different frequencies are allowed for transmission between transponder and RFID reading system. In certain applications, it is necessary that several such RFID registrations are performed in a comparatively small space. There is no interference between the individual applications as long as different frequencies can be used. However, due to the limited number of available frequencies, it may be the case that for different applications, the same frequency must be used for transmission between the transponder and the RFID reading system, although the radiation fields generated in the applications spatially overlap. This, in turn, may result in the aforementioned disturbances, which ultimately may at least degrade the reliability of the registration, or may jeopardize the simultaneous feasibility of all applications.
  • a possible solution to this problem may be that the performance of the RFID reading system is adapted to the respective range required. However, this requires an intervention in the electrical circuit of the RFID reading system or requires an increased circuit complexity.
  • a radio frequency electromagnetic radiation absorption element comprising a plurality of antenna circuit assemblies adapted to the frequency of the radiation, each having an antenna conductor structure for receiving radiant energy and means for converting the received radiant energy into another form of energy.
  • the Laid-Open Patent US 4,482,897 relates to an antenna having a segmented and curved reflecting surface for generating overlapping antenna beams from different sources.
  • the invention has the object to improve the generic type absorption element. This object is achieved in a surprisingly simple manner with an absorption element for electromagnetic high-frequency radiation with the features of claim 1.
  • the electromagnetic high-frequency radiation absorption element according to the invention has a plurality of antenna circuit arrangements adapted to the frequency of the radiation, each having an antenna conductor structure for receiving radiant energy and a means for converting the absorbed radiant energy into another form of energy.
  • the absorption element according to the invention is characterized in that a reflection device is provided with a curved reflection surface having a plurality of sections focusing on the high-frequency radiation for generating a plurality of regions with increased field strength in front of the reflection device, wherein the reflection surface of the reflection device has a wave structure, in particular a planar wave structure , The reflection surface may have mountains and valleys that run on straight lines.
  • a wave structure may be formed as a kind of juxtaposition of a plurality of cylindrical lenses for electromagnetic radiation.
  • absorption elements designed according to the invention With such absorption elements designed according to the invention, the propagation into such areas of space can be avoided, in which radiation of the same frequency for an RFID registration is used so that ultimately a mutual interference of different RFID applications is prevented. Moreover, in a single RFID application by means of such an absorption element according to the invention, it can be prevented that electromagnetic radiation propagates into regions in which this is undesirable.
  • the invention is based on the idea of preventing the propagation of electromagnetic high-frequency radiation into certain areas of space by providing a device which, on the one hand, reflects the radiation but, moreover, also ensures that the radiation is absorbed, i. is converted into another form of energy, so that no interference by multiply reflected high frequency radiation can occur.
  • High-frequency radiation and thermal radiation are considered as different forms of energy.
  • an antenna circuit arrangement may be arranged in front of the reflection device in a region of increased field strength, so that the radiation is picked up by the antenna circuit arrangement with high efficiency.
  • the means for converting the absorbed radiant energy to generate thermal energy is formed and may, for example, comprise a resistor which is connected to the antenna conductor structure.
  • the means for converting the received radiant energy may comprise an electroluminescent emitter such as a light emitting diode connected to the antenna conductor structure.
  • the radiant energy received by the antenna is converted into electrical energy, which in turn is converted into either IR radiation or visible radiation.
  • the user can visually display the effectiveness of the absorption element according to the invention.
  • an antenna circuit arrangement is arranged in a region of increased field strength in front of the reflection device such that the antenna conductor structure is aligned with the focused radiation.
  • the antenna structure can be adapted to the field strength profile in the areas with increased field strength.
  • the reflection surface of the reflection device comprises mutually adjacent different wave structure regions, wherein the wave troughs or wave peaks of adjacent wave structure regions are arranged perpendicular to one another.
  • the antenna conductor structure of the antenna circuit arrangements may be provided in the form of a dipole structure.
  • a dipoleite structure is particularly well suited to the fields generated by the described wave structure regions of the reflection surface. It may be expedient if the axis of the dipole structure is placed parallel to a wave crest or a wave trough of the wave structure at the reflection surface of the reflection means, i. that the Dipolleiter Quilt is aligned with the wave structure of the reflection surface.
  • the coupling of the radiation into the antenna conductor structure can be increased if the distance between the antenna conductor structure and the reflection surface is a predetermined distance. It may be expedient if this distance is equal to an odd multiple of half the wavelength of the high-frequency radiation. This ensures that the radiation reflected by the reflection surface of the reflection device is constructively superimposed on the incident radiation at the location of the antenna conductor structure.
  • antenna circuit arrangements are provided on both sides of the reflection device, so that incident radiation from both sides can be eliminated by the absorption element according to the invention.
  • the reflection device comprises a metal sheet or a wire mesh.
  • a metal sheet or braid With such a metal sheet or braid, it is possible in a simple manner to produce advantageous surface structures, in particular the wave structure regions mentioned above, by means of known shaping techniques.
  • the surface structure of the reflection device it can be provided that at least the two main surfaces of the reflection device are each covered by a plate-shaped device.
  • the necessary condition is that the plate-shaped element or the plate-shaped device comprises a material which transmits the radiation to be absorbed and in particular does not have a high degree of reflection for the electromagnetic radiation.
  • the covering device can in particular rest directly on the reflection device, so that the wave troughs or mountains are supported on the two covering devices.
  • the antenna circuit arrangements may be arranged on the surface of the covering device, as a result of which they can be arranged in a particularly simple manner in a location-specific manner, for example via a printing process such as a screen printing process.
  • the absorption element according to the invention can in principle be produced with any desired dimensions. It may be advantageous if the element is stackable, so that starting from the size of the absorption element arbitrarily large absorption surfaces or walls can be generated. It is expedient if the absorption element according to the invention is designed to be manually transportable in its dimensions or its weight.
  • Fig. 1 is an application situation for an inventive Absorption element 1, 2, 3, 4 shown.
  • the figure shows an outer hall wall 30, in which spaced apart two roller doors 31a, 31b are arranged.
  • These gates can be approached, for example, by a truck, such that the loading area is aligned with the gate.
  • a transport such as a forklift, which moves through the respective gate in the back of the truck, objects can be picked up and introduced through the said gate in the hall.
  • these objects are each provided with a transponder, which is detected by an RFID reading system placed in the area of the door.
  • a transponder 22a, 22b which in each case comprises a transponder antenna 23a, b, is shown by way of example in each of the gates 31a, 31b.
  • the respective transponder enters the effective range of the RFID reading device 20a, 20b, which respectively has an RFID antenna 21a, 21b, the respective transponder is detected and registered by the system. If both gates are used at the same time for introduction into the hall of goods marked with a transponder, the electromagnetic fields generated by the data exchange between the RFID reading system 20a and the associated transponder 22a or the RFID reading system 20b and the associated transponder 22b are generated, disturb. Such a disturbance occurs in particular when the RFID recognition systems operate at the same frequencies.
  • One or more of the absorption elements according to the invention can be used to remedy these disorders.
  • four elements 1-4 are shown in the interior of the hall, of which two are stacked on top of each other, such that they extend approximately perpendicular to the hall wall 30 in the hall interior. If, for example, from the antenna 21a of the RFID reading system 20a electromagnetic high-frequency radiation in the direction of the adjacent RFID reading system 20b or whose antenna 21b is radiated, this radiation is reflected and absorbed by the absorption elements 1, 2 arranged as shown, so that this radiation can not lead to erroneous detections. It can be particularly useful as in the FIG. 1 be shown, also on the second gate 31b such absorption elements 3, 4 set up so that all Torer chargeden are decoupled with respect to the gate-specific electromagnetic radiation.
  • FIG. 2a shows a thin metal sheet 40, which comprises a planar wave structure with wave crests 42 and wave troughs 41, wherein the wave troughs or wave crests each extend on a straight line.
  • the sheet will focus for incident high frequency electromagnetic radiation through the curved sections so that areas of increased field strength are formed in front of the sheet after reflection of the radiation.
  • dipole antennas are arranged in a manner to be described, see Fig. 2b showing such a dipole antenna 50. It comprises two monopolies 51, 52 as antenna conductor structures, wherein at the base of a matched to the impedance of the dipole loss resistor 53 is arranged, which connects both monopolies 51, 52 to each other electrically.
  • the dipole has an electrical length L corresponding to an odd multiple of ⁇ / 2, where ⁇ is the wavelength of the electromagnetic high frequency radiation.
  • the radiation field comprises UHF with a wavelength of 30 cm.
  • the plane wave structure of the reflection plate 40 has the property of cylinder lenses arranged side by side, inasmuch as the in Fig. 2b indicated dipole antenna adapted to the regions of increased field strength generated by the reflective plate 40.
  • the Fig. 2b specified antenna takes the electromagnetic High frequency field, wherein the absorbed energy is converted by means of the impedance matched resistor 53 into thermal energy.
  • Fig. 3 shows an inventive absorption element in an overview.
  • the element 1 is of cuboid construction, the main surfaces being provided by two main cover plates 60, 61.
  • the two longitudinal surfaces are formed by the side deck plates 62, 63, while the two end faces are provided by the side deck plates 64, 65.
  • the side surfaces serve as a standing surface, so the in Fig. 3 shown absorption element is also stackable.
  • Fig. 4 shows that in Fig. 3 shown absorption element 1 in a sectional view along the lines IV-IV.
  • the wave-shaped reflection plate 40 extends between the main cover plates 60, 61 over the entire surface thereof. In each case spaced from a wave trough dipole antennas 50a, 50b are arranged on both sides of the reflective plate 40.
  • Reference character S denotes a portion of the sectional view which is shown in FIG Fig. 5 shown in detail.
  • the wave structure in the described embodiment is composed of cylinder jacket segments, the radius of the cylinder segments being equal to R.
  • the distance of the antennas, here the antenna 50b, to the trough is A.
  • the distance of all dipole antennas to the respective associated trough is the same in the described embodiment.
  • the distance A can be, for example, equal to half the radius of curvature, ie R / 2.
  • M indicates in the drawing the center point for the curvature with the radius R.
  • the distance A is set to (n + 1) ⁇ ⁇ ⁇ / 2, where n is a natural number is.
  • Fig. 6 shows that in Fig. 1 illustrated absorption element according to the invention in a sectional view along the lines VI-VI, which runs parallel to one of the main cover plates 60 and 61, respectively.
  • the front dipole antennas 50a and the rear dipole antennas 50b are offset from each other relative to a plane parallel to the main top plates 60, 61, so that in FIG Fig. 6 only the rear dipole antennas 50b are in the illustrated plane.
  • all the antennas 50a, 50b are electrically independent of each other, they each comprise only as described the two matched monopolies, which are connected together at the base via the resistor 53, see Fig. 2 ,
  • Fig. 7 corresponds to the in Fig. 4
  • the front-side antennas 50b and rear antennas 50a are placed at a different distance to the associated trough, such that they rest against the respective back of the two main cover plates 60, 61.
  • the distance of the respective dipole antenna to the associated trough is in the in Fig. 7 2R shown example, where R corresponds to the radius of curvature of such a wave trough.
  • the arrangement of the antennas is relatively easy to accomplish, for example, the described antenna circuit arrangements can be printed on the back of the plates 60, 61.
  • the two monopoles can be applied, in particular via a screen-printing process, and subsequently the resistor adapted to the impedance can be glued in with a conductive adhesive.
  • the embodiments described so far are adapted to the absorption of electromagnetic high-frequency radiation of a predetermined polarization. Since in the reflection of electromagnetic radiation on metallic surfaces a Polarization rotation occurs by 90 °, it may be very advantageous if the absorption element according to the invention for absorbing electromagnetic high frequency radiation of different polarization is formed.
  • FIGS. 8a and 8b show sections corresponding to those in FIGS FIGS. 4 and 6 shown by such, polarization independent working absorption element. Sections with perpendicular dipole antennas alternate with sections where the dipoles are oriented horizontally, see Figure 8b. In this respect, an absorption element designed in this way captures and absorbs radiation with horizontal as well as radiation with vertical polarization.
  • the wave structure of the reflection plate is adapted to the course of the dipole antennas. This means that in the sections where the dipoles are vertical, the wave structure is, for example, as in FIG Fig. 4 indicated, is formed. However, in those sections where the dipoles are horizontal, the wave structure is rotated 90 ° to the wave structure of the previous section, ie wave troughs and wave peaks also run on horizontal lines there, see FIG. 8a.
  • antenna circuit arrangements which comprise an antenna dipole, wherein the reflection means is adapted to the geometry of the dipole antennas by means of the described wave structure.
  • other antenna structures may be used, to which then the curvature of the reflection means is adapted.
  • the absorption element according to the invention can be used in principle for all applications in which electromagnetic interference is to be destroyed.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Inorganic Insulating Materials (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Claims (13)

  1. Elément d'absorption pour rayonnement électromagnétique à haute fréquence, comportant une pluralité d'agencements de circuit d'antenne (50a, 50b) adaptés à la fréquence du rayonnement et ayant chacun une structure de conducteur d'antenne (51, 52) pour la réception d'énergie de rayonnement et un moyen (53) pour la conversion de l'énergie de rayonnement reçue en une autre énergie, caractérisé par un dispositif de réflexion (40) à une surface de réflexion courbée avec une pluralité de sections focalisant le rayonnement à haute fréquence pour produire une pluralité de zones au champ élevé devant le dispositif de réflexion, la surface de réflexion du dispositif de réflexion (40) ayant une structure ondulée.
  2. Elément d'absorption selon la revendication 1, caractérisé en ce que le moyen pour la conversion de l'énergie de rayonnement reçue produit d'énergie thermique et comporte notamment une résistance (53) qui est connectée à la structure de connecteur d'antenne (51, 52).
  3. Elément d'absorption selon la revendication 1, caractérisé en ce que le moyen pour la conversion de l'énergie de rayonnement reçue comporte un radiateur électroluminescent tel qu'une diode électroluminescente qui est connectée à la structure de connecteur d'antenne.
  4. Elément d'absorption selon la revendication 1, 2 ou 3, caractérisé en ce qu'un agencement de circuit d'antenne (50a, 50b) dans une zone au champs élevé devant le dispositif de réflexion (40) est arrangé de sorte que la structure de connecteur d'antenne est orientée vers le rayonnement focalisé.
  5. Elément d'absorption selon la revendication 1, caractérisé en ce que la surface de réflexion comporte des zones de structure ondulée voisines l'une à l'autre, les creux d'onde (41) respectivement les crêtes d'onde (42) des zones de structure ondulée voisines l'une à l'autre étant disposés verticalement l'une par rapport à l'autre.
  6. Elément d'absorption selon l'une des revendications 1 à 5, caractérisé en ce que la structure de conducteur d'antenne (51, 52) présente une structure dipôle.
  7. Elément d'absorption selon l'une des revendications 1 à 6, caractérisé en ce que la structure de conducteur d'antenne est disposée à une distance prédéterminée du dispositif de réflexion, notamment à une distance de la surface de réflexion égale à un multiple impair de la demi-longueur d'onde du rayonnement à haute fréquence.
  8. Elément d'absorption selon l'une des revendications 1 à 7, caractérisé en ce que des agencements de circuit d'antenne (51, 52) sont prévus de part et d'autre du dispositif de réflexion (40).
  9. Elément d'absorption selon l'une des revendications 1 à 8, caractérisé en ce que le dispositif de réflexion comporte une tôle ou un grillage métallique.
  10. Elément d'absorption selon l'une des revendications 1 à 9, caractérisé en ce que l'une au moins des deux surfaces majeures du dispositif de réflexion est couverte d'un moyen de recouvrement un forme de plaque (60, 61).
  11. Elément d'absorption la revendication 10, caractérisé en ce que les agencements de circuit d'antenne (50a, 50b) sont fixés sur un élément en forme de plaque (60, 61).
  12. Elément d'absorption la revendication 11, caractérisé en ce que des structures de conducteur d'antenne des agencements de circuit d'antenne peuvent être appliquées sur un élément en forme de plaque au moyen d'un procédé d'imprimerie tel qu'un procédé de sérigraphie.
  13. Elément d'absorption selon l'une des revendications 1 à 12, caractérisé en ce que l'élément d'absorption est agencé de sorte qu'il peut être érigé sur une de ses faces latérales et de sorte qu'il peut être empilé.
EP07010006A 2006-05-24 2007-05-19 Elément d'absorption pour rayonnement électromagnétique à haute fréquence Not-in-force EP1860733B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006008437U DE202006008437U1 (de) 2006-05-24 2006-05-24 Absorptionselement für elektromagnetische Hochfrequenzstrahlung

Publications (2)

Publication Number Publication Date
EP1860733A1 EP1860733A1 (fr) 2007-11-28
EP1860733B1 true EP1860733B1 (fr) 2010-04-14

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EP07010006A Not-in-force EP1860733B1 (fr) 2006-05-24 2007-05-19 Elément d'absorption pour rayonnement électromagnétique à haute fréquence

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EP (1) EP1860733B1 (fr)
AT (1) ATE464675T1 (fr)
DE (2) DE202006008437U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3035742B1 (fr) * 2015-04-30 2018-03-23 Airbus Operations Dispositif d'absorption d'ondes electromagnetiques destine a etre fixe sur une paroi
CN115460902B (zh) * 2022-09-30 2025-02-21 紫光计算机科技有限公司 电磁辐射的消除方法及消除装置、电子设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599210A (en) * 1969-11-18 1971-08-10 Us Navy Radar absorptive coating
US4482897A (en) 1982-06-28 1984-11-13 At&T Bell Laboratories Multibeam segmented reflector antennas
GB2251338B (en) * 1985-10-15 1992-09-16 Secr Defence Microwave absorber
US5325094A (en) * 1986-11-25 1994-06-28 Chomerics, Inc. Electromagnetic energy absorbing structure
WO1994024724A1 (fr) * 1993-04-09 1994-10-27 Chomerics, Inc. Absorbeur d'energie electromagnetique a large bande

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Publication number Publication date
ATE464675T1 (de) 2010-04-15
DE202006008437U1 (de) 2007-09-27
EP1860733A1 (fr) 2007-11-28
DE502007003440D1 (de) 2010-05-27

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