EP0568511B1 - Schirmvorrichtung - Google Patents

Schirmvorrichtung Download PDF

Info

Publication number
EP0568511B1
EP0568511B1 EP19930850084 EP93850084A EP0568511B1 EP 0568511 B1 EP0568511 B1 EP 0568511B1 EP 19930850084 EP19930850084 EP 19930850084 EP 93850084 A EP93850084 A EP 93850084A EP 0568511 B1 EP0568511 B1 EP 0568511B1
Authority
EP
European Patent Office
Prior art keywords
plate
screen
screen means
transmission
screen 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.)
Expired - Lifetime
Application number
EP19930850084
Other languages
English (en)
French (fr)
Other versions
EP0568511A1 (de
Inventor
Göran Larsson
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.)
Saab AB
Saabtech Electronics AB
Original Assignee
CelsiusTech Electronics AB
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 CelsiusTech Electronics AB filed Critical CelsiusTech Electronics AB
Publication of EP0568511A1 publication Critical patent/EP0568511A1/de
Application granted granted Critical
Publication of EP0568511B1 publication Critical patent/EP0568511B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/425—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising a metallic grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective

Definitions

  • the present invention relates to a screen device comprising a frequency selective screen means selectively transmitting or preventing transmission of electromagnetic radiation in dependence on the radiation frequency incident and a plate movable relative to the screen means having electromagnetic radiation transmissible and non-transmissible sections, the cooperation between the screen means and the plate influencing the transmission characters of the screen device.
  • the invention also relates to a radome comprising a screen device according to the invention.
  • a screen device is previously known from EP-A-0 468 623.
  • the known device one or more plates are disposed at a spacing from tile screen means. By moving the plate, the power or frequency characteristics are modulated.
  • the screen device With spaced apart elements there is always a considerable amount of transmission. Due to that fact the screen device is not suitable for application fields requiring a more effective suppression of the radiation within the transmission range of the screen device. For example it is not possible to obtain desired suppression in a radome for a radar antenna.
  • the object of the invention is obtained by means of a screen device characterized in that the surface of the screen means facing the plate is constituted by a metal layer provided with slots or recesses, that the surface of the plate facing the screen means is provided with metal sections separated by non-metal sections and that said surfaces of the screen means and the plate are applied in mutual contact with each other in a first and second transmission state of the screen device, the first transmission state corresponding to a first position of the plate leaving the slots or recesses of the screen means open allowing radiation within the transmission range of the screen means to pass, the second transmission state corresponding to a second position of the plate hiding the slots or recesses essentially preventing the radiation within the transmission range of the screen means to pass.
  • a relatively small displacement of the plate is needed between the two positions and due to that a rapid switching may be carried out.
  • the metal layer provided with slots of the screen means together with the metal sections of the plate form a metallic area resulting in an effective screening of the electromagnetic radiation in question.
  • the plate is displaced between the first and the second position by means of a linear displacement in a plane parallel to the surface of the screen means facing the plate.
  • a linear displacement in a plane parallel to the surface of the screen means facing the plate.
  • a reflector antenna 1 is protected by a radome 2.
  • the radome 2 comprises a screen means in the shape of a frequency selective plate 3, and a displaceable plate 4.
  • the plates are inclined relative to the antenna opening in order not to reflect electromagnetic radiation incident in the lobe direction of the antenna and which is not allowed to pass trough the plates back in the direction from which the radiation is incident.
  • a rim comprised in the radome running around the periphery of the antenna. Together with the plates 3,4 the rim 5 form a closed space.
  • a driving means 6 In order to displace the displaceable plate 4 there is a driving means 6.
  • the driving means is connected with the displaceable plate 4 by means of a transmission belt 7 guided around a number of guide elements 8-11.
  • spring means 12 In order to keep the transmission belt stretched, spring means 12 may be included.
  • the screen means 3 and the displaceable plate 4 included in the screen device are shown separately in figure 2.
  • the screen means 3 is provided with a metal layer 13 in the surface layer facing the displaceable plate 4. As evident from figure 3 and the corresponding description below, there are slots in the surface layer.
  • the displaceable plate is provided with metal sections 14 in the surface facing the screen means.
  • slots or recesses 15 in the surface layer 13 of the screen means 3.
  • the metal layer 13 is missing and the embodiment of the slots in essential determines the frequency selectivity of the screen means.
  • Figures 4a and 4b show examples of how the metal sections 14 of the displaceable plate may be embodied.
  • the metal sections are constituted by parallel elongated section separated by somewhat wider and elongated sections 16 free from metal.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Details Of Aerials (AREA)

Claims (3)

  1. Abschirmvorrichtung mit einem frequenzselektiven Schirm (3), der elektromagnetische Strahlung in Abhängigkeit von der Strahlungsfrequenz selektiv durchläßt oder nicht durchläßt, und einer relativ zu dem Schirm beweglichen Platte (4), die für elektromagnetische Strahlung durchlässige und undurchlässige Abschnitte (14 bzw. 16) aufweist, wobei das Zusammenwirken zwischen dem Schirm und der Platte das Durchlässigkeitsverhalten der Abschirmvorrichtung beeinflußt,
    dadurch gekennzeichnet, daß die der Platte (4) zugewandte Oberfläche des Schirms (3) von einer Metallschicht (13) mit Löchern oder Ausnehmungen (15) gebildet ist, daß die dem Schirm zugewandte Oberfläche der Platte (4) mit Metallabschnitten (14) versehen ist, die durch nichtmetallische Abschnitte (16) voneinander getrennt sind, und daß die Oberflächen des Schirms und der Platte in einem ersten und einem zweiten Durchlässigkeitszustand der Abschirmvorrichtung miteinander in Berührung gebracht werden, wobei der erste Durchlässigkeitszustand einer ersten Stellung der Platte entspricht, in der sie die Löcher oder Ausnehmungen (15) des Schirms offenläßt, so daß Strahlung innerhalb des Durchlässigkeitsbereichs des Schirms hindurchtreten kann, und wobei der zweite Durchlässigkeitszustand einer zweiten Stellung der Platte entspricht, in der sie die Löcher oder Ausnehmungen (15) abdeckt, wodurch der Durchtritt von Strahlung innerhalb des Durchlässigkeitsbereiches des Schirms im wesentlichen verhindert wird.
  2. Abschirmvorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß die Platte (4) zwischen der ersten und zweiten Stellung bewegbar ist durch lineare Verschiebung in einer Ebene parallel zu der der Platte zugewandten Oberfläche des Schirms.
  3. Radom (2) mit einer Abschirmvorrichtung nach einem der vorangehenden Ansprüche.
EP19930850084 1992-04-30 1993-04-15 Schirmvorrichtung Expired - Lifetime EP0568511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9201381 1992-04-30
SE9201381A SE505054C2 (sv) 1992-04-30 1992-04-30 Skärmanordning samt radom innefattande skärmanordningen

Publications (2)

Publication Number Publication Date
EP0568511A1 EP0568511A1 (de) 1993-11-03
EP0568511B1 true EP0568511B1 (de) 1997-10-29

Family

ID=20386122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930850084 Expired - Lifetime EP0568511B1 (de) 1992-04-30 1993-04-15 Schirmvorrichtung

Country Status (3)

Country Link
EP (1) EP0568511B1 (de)
DE (1) DE69314843T2 (de)
SE (1) SE505054C2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336841C1 (de) * 1993-10-28 1995-05-04 Deutsche Aerospace Abdeckung für Radarantennen
DE4336840C1 (de) * 1993-10-28 1995-02-09 Deutsche Aerospace Abdeckung für Radarantennen
DE4405996C2 (de) * 1994-02-24 1996-01-11 Daimler Benz Aerospace Ag Vorrichtung zur Tarnung von Antennen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB600433A (en) * 1945-10-31 1948-04-08 Henry George Booker Improvements in or relating to wireless aerials
GB1416343A (en) * 1972-02-16 1975-12-03 Secr Defence Radomes
GB2246474A (en) * 1990-07-24 1992-01-29 British Aerospace A layered frequency selective surface assembly
GB9019628D0 (en) * 1990-09-07 1992-04-08 Univ Loughborough Reconfigurable frequency selective surface

Also Published As

Publication number Publication date
SE505054C2 (sv) 1997-06-16
DE69314843T2 (de) 1998-03-19
DE69314843D1 (de) 1997-12-04
EP0568511A1 (de) 1993-11-03
SE9201381D0 (sv) 1992-04-30
SE9201381L (sv) 1993-10-31

Similar Documents

Publication Publication Date Title
EP0468623B1 (de) Geschichtete frequenzselektive Oberflächenvorrichtung und Verfahren zum Modulieren von Leistungs- und Frequenzcharakteristiken hiermit
DE60103484T2 (de) Ein Verfahren zur Herstellung einer Antenne mit reduziertem Effekt von Mehrwegereflektionen
US6882256B1 (en) Anchorless electrostatically activated micro electromechanical system switch
US6496138B1 (en) Electromagnetic wave radar device mounted on a car
US5528249A (en) Anti-ice radome
US6822622B2 (en) Electronically reconfigurable microwave lens and shutter using cascaded frequency selective surfaces and polyimide macro-electro-mechanical systems
CN111542774A (zh) 非接触式波导开关和用于制造波导开关的方法
US5619061A (en) Micromechanical microwave switching
US6335699B1 (en) Radome
US4870424A (en) Method and apparatus for reducing unwanted r.f. signal antenna reception/transmission
DE60219713T2 (de) Phasenschieber, phasengesteuerte Gruppenantenne und Radargerät
US10903582B2 (en) Antenna array and communications device
WO2002023672A3 (en) Microelectromechanical phased array antenna
EP0568511B1 (de) Schirmvorrichtung
US4476471A (en) Antenna apparatus including frequency separator having wide band transmission or reflection characteristics
WO1999059222A3 (en) Method of manufacturing an antenna structure and an antenna structure manufactured according to the said method
US20050219145A1 (en) Complementary dual antenna system
US6310583B1 (en) Steerable offset reflector antenna
WO1994000891A1 (en) Reconfigurable frequency selective surfaces
US4480254A (en) Electronic beam steering methods and apparatus
GB2269055A (en) Phase correction zone plate
CA2177050C (en) Dielectric antenna
CN111403899B (zh) 多频天线结构
GB2253519A (en) Reconfigurable frequency selective surfaces
EP0159301B1 (de) Elektronisch gesteuerte Gruppenantenne mit reduzierten Nebenkeulen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19940426

17Q First examination report despatched

Effective date: 19951214

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CELSIUSTECH ELECTRONICS AB

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

ET Fr: translation filed
REF Corresponds to:

Ref document number: 69314843

Country of ref document: DE

Date of ref document: 19971204

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

NLS Nl: assignments of ep-patents

Owner name: SAAB AB

Effective date: 20080421

NLT1 Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1

Owner name: SAABTECH ELECTRONICS AKTIEBOLAG

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20090405

Year of fee payment: 17

Ref country code: IT

Payment date: 20090421

Year of fee payment: 17

Ref country code: FR

Payment date: 20090417

Year of fee payment: 17

Ref country code: DE

Payment date: 20090409

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090415

Year of fee payment: 17

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20101101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100415

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20101230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100415

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100415

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100430