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EP1612887A1 - A device for shielding of Antennas from electromagnetic fields - Google Patents

A device for shielding of Antennas from electromagnetic fields

Info

Publication number
EP1612887A1
EP1612887A1 EP20050007153 EP05007153A EP1612887A1 EP 1612887 A1 EP1612887 A1 EP 1612887A1 EP 20050007153 EP20050007153 EP 20050007153 EP 05007153 A EP05007153 A EP 05007153A EP 1612887 A1 EP1612887 A1 EP 1612887A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
cage
device
antennas
electromagnetic
fields
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
Application number
EP20050007153
Other languages
German (de)
French (fr)
Other versions
EP1612887B1 (en )
Inventor
Harm-Friedrich Dr. Harms
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.)
BLOHM + VOSS NAVAL GMBH
Original Assignee
NORDSEEWERKE GmbH
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

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q1/00Details of, or arrangements associated with, aerials
    • H01Q1/52Means for reducing coupling between aerials; Means for reducing coupling between an aerial and another structure
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QAERIALS
    • H01Q1/00Details of, or arrangements associated with, aerials
    • H01Q1/52Means for reducing coupling between aerials; Means for reducing coupling between an aerial and another structure
    • H01Q1/526Electromagnetic shields

Abstract

A device for screening electromagnetic fields of antennas in which the cage (2) is a square-shape, especially in the form of a cube for receiving and enclosing the aerial (5) in which the outer edges of the cage (2) are formed at least above one positioning surface by combined bars (3,4) made of electrically conducting material for forming meshes.

Description

  • [0001]
    Die Erfindung bezieht sich auf eine Vorrichtung zur Schirmung elektromagnetischer Felder von Antennen, insbesondere GPS-Antennen auf Marineschiffen mittels eines Schirmkäfigs als Faradaykäfig. The invention relates to an apparatus for shielding electromagnetic fields of antennas, in particular GPS antennas on naval vessels by means of a screen cage as a Faraday cage.
  • [0002]
    Bei der Verwendung von Antennen im Oberdecksbereich von Marineschiffen werden relativ hohe Feldstärken erzeugt. When using antennas in the upper deck area of ​​naval ships relatively high field strengths are generated. Insbesondere im Hochfrequenzbereich (1,5 MHz bis 30 MHz) liegen diese bei einigen 100 V/m. Especially in the high frequency range (1.5 MHz to 30 MHz) are those in some 100 V / m. Handelsübliche Geräte (Commercial off the Shelf, COTS) sind mit EMV-Festigkeiten von 10 V/m spezifiziert, militärische Geräte und Anlagen mit 200 V/m. Commercially available devices (Commercial off the Shelf COTS) are specified with EMC strength of 10 V / m, military equipment and equipment with 200 V / m. Bei der Aufstellung von militärisch spezifizierten Geräten und Anlagen ist die Zahl der Standorte bereits beschränkt, die Verwendung von COTS-Geräten ist nur sehr eingeschränkt oder gar nicht möglich. When setting up military-specified devices and equipment the number of sites is already restricted the use of COTS devices is very limited or not possible.
  • [0003]
    Aufgabe der Erfindung ist es, eine durchführbare Abschirmung auf einfache Weise zu schaffen, die eine störende Feldstärke ausreichend abschirmt und das geschützte Gerät in seiner Funktion nicht beeinträchtigt. Object of the invention is to create a viable screening in a simple way that sufficient shielding an interfering field strength and does not affect the protected equipment in its function.
  • [0004]
    Die Lösung dieser Aufgabe erfolgt erfindungsgemäß dadurch, daß der Käfig in der Art eines Quaders, insbesondere in Form eines Würfels, zur Aufnahme und Umhüllung der Antenne gebildet ist, wobei die Begrenzungskanten des Käfigs mindestens oberhalb einer Aufstellfläche durch verbundene Stäbe aus elektrisch leitendem Material zur Bildung von Maschen gebildet sind. The solution of this object is achieved according to the invention characterized in that the cage in the manner of a cuboid, in particular in the form of a cube, is formed for receiving and wrapping of the antenna, the boundary edges of the cage at least above a mounting surface by connected rods of electrically conductive material to form are formed by meshes.
  • [0005]
    Hierdurch ist auf einfache Weise eine Schirmung der Antenne bei gleichzeitigem Durchlassen der Frequenzen zu ermöglichen, dh eine Schirmung einer GPS-Antenne gegen HF (1 MHz bis 30 MHz) bei gleichzeitigem Durchlasen der GPS-Frequenzen von etwa 1,5 GHZ zu ermöglichen. In this way is to allow in a simple manner a shielding of the antenna at the same time passing the frequencies, ie, to enable shielding of a GPS antenna to HF (1 MHz to 30 MHz) with a simultaneous read through the GPS frequencies of about 1.5 GHz.
  • [0006]
    Es ist eine Schirmung im Bereich von 10 dB entsprechend einem Faktor drei bis vier erreichbar. There is a shielding in the range of 10 dB corresponding to a factor of three to four achievable.
  • [0007]
    Die entsprechende Auslegung wird dadurch vereinfacht, daß die Antenne als Erzeuger von abzuschirmenden hohen Frequenzen im Zentrum des gebildeten Käfigs angeordnet ist. The appropriate design is simplified in that the antenna is arranged as a producer of shielded high frequencies in the center of the cavity formed.
  • [0008]
    Ferner wird vorgeschlagen, daß die Aufstellfläche für die angeordneten Stäbe des Käfigs eine elektrisch leitende Fläche ist. It is further proposed that the installation area for the bars of the cage is arranged an electrically conductive surface.
  • [0009]
    zur Erhöhung einer Schirmung wird vorgeschlagen, daß mehrere Käfige kaskadenförmig einander zugeordnet sind. for increasing a shielding is proposed that several cages are associated with each other in cascade.
  • [0010]
    Hierdurch werden bei einer Schirmung von ca. 11 dB durch einen Käfig mit zwei Käfigen etwa 20 dB und mit drei Käfigen etwa 30 dB erreicht. In this way, about 20 dB and three cages are reached approximately 30 dB at a shielding of about 11 dB by a cage with two cages.
  • [0011]
    Zur Bestimmung günstiger Verhältnisse wird vorgeschlagen, daß die Stablänge zur Bildung der Maschengröße des Käfigs in Abhängigkeit einer Frequenz der zu schirmenden Feldstärke und einer Nutzfrequenz der zu schirmenden Antenne abgestimmt ist. To determine more favorable conditions it is proposed that the rod length to form the mesh size of the cage is tuned in response to a frequency of the shielding field strength and a useful frequency of the antenna to be shielded.
  • [0012]
    In der zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und erläutert. In the drawing, an embodiment of the invention is schematically shown and explained. Es zeigen: Show it:
  • Fig. 1 Fig. 1
    einen prinzipiellen Aufbau einer Anordnung mit einem würfelförmigen Käfig, a basic design of an arrangement with a cube-shaped cage,
    Fig. 2 Fig. 2
    eine Anordnung mit einer aufgenommenen GPS-Antenne, an arrangement with a recorded GPS antenna,
    Fig. 3 Fig. 3
    eine Feldverteilung in einem Käfig in Draufsicht, a field distribution in a cage in plan view,
    Fig. 4 Fig. 4
    ein Diagramm einer Feldanalyse der Schirmung einer GPS-Antenne in Abhängigkeit der Würfelkantenlänge bei gleichzeitigem Durchlassen der GPS-Frequenzen von etwa 1,5 GHz. a diagram of a field analysis of the shielding of a GPS antenna in dependence of the cube edge length while simultaneously passing the GPS frequencies of about 1.5 GHz.
  • [0013]
    Bei der dargestellten Anordnung ist auf einer leitenden Aufstellfläche 1 eine Würfelausbildung 2 als Käfig durch leitende Stäbe 3,4 gebildet, die als senkrechte Stäbe 3 und waagerechte Stäbe 4 miteinander verbunden sind und im Zentrum des gebildeten umschlossenen Raumes eine Antenne 5 aufnehmen. In the illustrated arrangement, a cube formation 2 is formed as a cage by conductive rods 3,4 on a conductive mounting surface 1, which are connected to each other as vertical bars 3 and horizontal bars 4 and record in the center of the enclosed space formed an antenna. 5 Hierdurch werden als Durchtrittsöffnungen entsprechende Maschinen 6 zum Durchlaß der verwendeten Frequenzen der eingeschlossene Antenne 5 geschaffen. In this way, as passage openings corresponding machine 6 are provided for the passage of the frequencies of the included antenna 5 used.
  • [0014]
    Die Länge der entsprechenden Stäbe 3,4 ergeben dabei in Abhängigkeit der abzuschirmenden Frequenzen die entsprechende Schirmung, wie es in Fig. 4 angegeben wurde. The length of the respective rods 3,4 thereby resulting in a function of the frequencies to be shielded, the corresponding shielding, as has been indicated in Fig. 4.
  • [0015]
    zur Verdeutlichung der Anordnung wird in Fig. 3 die Feldverteilung 7 im Käfig 2 dargestellt. for clarification of the arrangement, the field distribution 7 is shown in the cage 2 in Fig. 3.

Claims (5)

  1. Vorrichtung zur Schirmung elektromagnetischer Felder von Antennen, insbesondere GPS-Antennen auf Marineschiffen mittels eines Schirmkäfigs als Faradaykäfig, dadurch gekennzeichnet, daß der Käfig (2) in der Art eines Quaders, insbesondere in Form eines Würfels, zur Aufnahme und Umhüllung der Antenne (5) gebildet ist, wobei die Begrenzungskanten des Käfigs (2) mindestens oberhalb einer Aufstellfläche (1) durch verbundene Stäbe (3,4) aus elektrisch leitendem Material zur Bildung von Maschen (6) gebildet sind. An apparatus for shielding electromagnetic fields of antennas, in particular GPS antennas on naval vessels by means of a screen cage as a Faraday cage, characterized in that the cage (2) in the manner of a cuboid, in particular in the form of a cube, for receiving and wrapping of the antenna (5) is formed, the boundary edges of the cage (2) at least above a mounting surface (1) by connected rods (3,4) are formed of electrically conductive material to form stitches (6).
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Antenne (5) als Erzeuger von abzuschirmenden hohen Frequenzen im Zentrum des gebildeten Käfigs (2) angeordnet ist. Device according to claim 1, characterized in that the antenna (5) to be shielded as a producer of high frequencies in the center of the cage (2) formed is arranged.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Aufstellfläche (1) für die angeordneten Stäbe (3,4) des Käfigs (2) eine elektrisch leitende Fläche ist. Device according to claim 1 or 2, characterized in that the mounting surface (1) for the spaced bars (3,4) of the cage (2) is an electrically conductive surface.
  4. Vorrichtung nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß mehrere Käfige (2) kaskadenförmig einander zugeordnet sind. Device according to claim 1 or 3, characterized in that a plurality of cages (2) are assigned to one another in cascade.
  5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Stablänge zur Bildung der Maschengröße des Käfigs (2) in Abhängigkeit einer Frequenz der zu schirmenden Feldstärke und einer Nutzfrequenz der zu schirmenden Antenne (5) abgestimmt ist. Device according to one of claims 1 to 3, characterized in that the rod length to form the mesh size of the cage (2) is tuned in dependence of a frequency of the to-shielding field strength and a useful frequency of the to-shielding antenna (5).
EP20050007153 2004-06-28 2005-04-01 A device for shielding of Antennas from electromagnetic fields Active EP1612887B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200410031667 DE102004031667B4 (en) 2004-06-28 2004-06-28 An apparatus for shielding electromagnetic fields of antennas

Publications (2)

Publication Number Publication Date
EP1612887A1 true true EP1612887A1 (en) 2006-01-04
EP1612887B1 EP1612887B1 (en) 2012-06-06

Family

ID=34934671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050007153 Active EP1612887B1 (en) 2004-06-28 2005-04-01 A device for shielding of Antennas from electromagnetic fields

Country Status (4)

Country Link
EP (1) EP1612887B1 (en)
DE (1) DE102004031667B4 (en)
DK (1) DK1612887T3 (en)
ES (1) ES2388841T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2091102A1 (en) * 2008-02-18 2009-08-19 TKMS Blohm + Voss Nordseewerke GmbH Device for performing an EMV system test
EP2916387A1 (en) * 2014-03-04 2015-09-09 The Boeing Company Lightning protected radome system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568162A (en) 1994-08-08 1996-10-22 Trimble Navigation Limited GPS navigation and differential-correction beacon antenna combination
FR2844639A1 (en) * 2002-09-13 2004-03-19 Amp C3C Faraday cage support for antenna comprises pyramidal housing of composition material, cellular core and metal corners

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568162A (en) 1994-08-08 1996-10-22 Trimble Navigation Limited GPS navigation and differential-correction beacon antenna combination
FR2844639A1 (en) * 2002-09-13 2004-03-19 Amp C3C Faraday cage support for antenna comprises pyramidal housing of composition material, cellular core and metal corners

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ROLAND CALVAS; JACQUES DELABALLE: "Koexistenz von Starkstrom und Schwachstrom", SCHNEIDER ELECTRIC, TECHNISCHES HEFT NR. 187, April 1997 (1997-04-01), ZÜRICH, pages 1 - 25, XP002334408 *
ROLAND CALVAS; JAQUES DELABALLE: "Koexistenz von Starkstrom und Schwachstrom", SCHNEIDER ELECTRIC, TECHNISCHES HEFT NR., vol. 187, April 1997 (1997-04-01), pages 1 - 26, XP002334408

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2091102A1 (en) * 2008-02-18 2009-08-19 TKMS Blohm + Voss Nordseewerke GmbH Device for performing an EMV system test
EP2916387A1 (en) * 2014-03-04 2015-09-09 The Boeing Company Lightning protected radome system

Also Published As

Publication number Publication date Type
DK1612887T3 (en) 2012-09-17 grant
DE102004031667A1 (en) 2006-02-09 application
DE102004031667B4 (en) 2007-09-13 grant
ES2388841T3 (en) 2012-10-19 grant
EP1612887B1 (en) 2012-06-06 grant

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