EP0250082A2 - Véhicule comportant une antenne radar - Google Patents

Véhicule comportant une antenne radar Download PDF

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Publication number
EP0250082A2
EP0250082A2 EP87304173A EP87304173A EP0250082A2 EP 0250082 A2 EP0250082 A2 EP 0250082A2 EP 87304173 A EP87304173 A EP 87304173A EP 87304173 A EP87304173 A EP 87304173A EP 0250082 A2 EP0250082 A2 EP 0250082A2
Authority
EP
European Patent Office
Prior art keywords
antenna
radar
nose portion
vehicle
vehicle according
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Withdrawn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
EP87304173A
Other languages
German (de)
English (en)
Other versions
EP0250082A3 (fr
Inventor
John Nicholas Shepperd
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.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
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 British Aerospace PLC filed Critical British Aerospace PLC
Publication of EP0250082A2 publication Critical patent/EP0250082A2/fr
Publication of EP0250082A3 publication Critical patent/EP0250082A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H01Q21/005—Slotted waveguides arrays
    • H01Q21/0056—Conically or cylindrically arrayed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/281—Nose antennas

Definitions

  • This invention relates to a radar antenna arranged to reduce or at least change the radar signature of a vehicle on which it is mounted.
  • radar signature is meant that characteristic radar signal which, when the vehicle is illuminated by a radar emission, is returned from the vehicle and received back at the radar source.
  • vehicle is to be used in a broad sense to include aircraft and other aerial vehicles, such as guided weapons, in addition to ground or sea based vehicles.
  • the radar equipment may be mounted in the nose of the vehicle such as an aircraft or guided weapon or may be mounted in the nose of a pod attached to the vehicle.
  • Such equipment makes a significant contribution to the radar signature of a vehicle particularly over its forward hemisphere which is the dominant radar cross-section illuminated by an enemy search radar. This is particularly so where an enemy search radar is operating at the same frequency or at certain multiples of the vehicle's radar frequency.
  • a vehicle includes a radar antenna mounted in a nose portion of it, the antenna being shaped substantially to conform the exterior contour of the nose portion and having a surface angled with reference to the forward direction and hence to the expected direction of incident emission from a threat radar, so that the emission is deflected away from and not returned to its source.
  • the antenna is of hollow, generally tubular form so that equipment, either associated with the radar antenna or separate from it, can be housed within the antenna.
  • the antenna has the form substantially of a truncated cone with spaced, not necessarily regular, leading and trailing edges lying aft of the apex.
  • the antenna can extend fully around the nose portion. Its included angle can be selected not only such that the incident radiation from a threat radar source positioned generally forward of the aircraft is deflected by the exterior shape of the antenna in directions other than back to source, but that the desired exterior shape of the nose of the vehicle is closely followed.
  • the outside of the antenna may include radiating slots through which the radar radiation is emitted and, in this case these slots are preferably covered by a microwave transparent skin.
  • the radar radiation emitted from the antenna is caused to scan by known electronic scanning techniques.
  • the antenna thus remains fixed during the scanning.
  • Figure 1 an aircraft has a nose region 10 which diverges rearwardly from an apex 11 towards the remainder of the fuselage.
  • the nose region 10 may or may not be circular in cross section.
  • a radar antenna 12 This is formed as a truncated cone with a forward edge 13 and a rearward edge 14, the region in between being formed of metal with radiating slots 15 of known design.
  • the nose region 10 is formed of a hollow metal cone-like member, the antenna 12 is frusto-conical and provided with radiating slots 15.
  • the antenna 12 is housed within a radar transparent radome 16 made, for example, of Kevlar (Registered Trade Mark).
  • the antenna is formed as a rigid tube structure having an outer skin portion 17 with the slots 15 and a cavity forming wall structure 18.
  • Transmission line feeds 19 feed the microwave radiation to the cavities 18.
  • the radar emission is caused to adopt a beam type configuration and to be scanned by electronic means feeding the transmission line feeds 19.
  • the front and rear edges 13 and 14 may not be parallel with one another, the antenna may form only part of a solid of revolution, and moreover it may or may not be circular in cross-section.
  • radar or other equipment can be mounted not only at 21 in Figure 1 but also in the hollow interior of the antenna 12. It can also be mounted ahead of the antenna at 22 ( Figures 1 and 2).

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP87304173A 1986-05-12 1987-05-11 Véhicule comportant une antenne radar Withdrawn EP0250082A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8611504 1986-05-12
GB868611504A GB8611504D0 (en) 1986-05-12 1986-05-12 Radar signature reduction

Publications (2)

Publication Number Publication Date
EP0250082A2 true EP0250082A2 (fr) 1987-12-23
EP0250082A3 EP0250082A3 (fr) 1990-03-14

Family

ID=10597717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304173A Withdrawn EP0250082A3 (fr) 1986-05-12 1987-05-11 Véhicule comportant une antenne radar

Country Status (2)

Country Link
EP (1) EP0250082A3 (fr)
GB (1) GB8611504D0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741958A1 (fr) * 1995-12-04 1997-06-06 Aerospatiale Radioaltimetre protege contre diverses detections
US20140085143A1 (en) * 2012-09-27 2014-03-27 Raytheon Company Methods and apparatus for fragmented phased array radar
EP3639325A4 (fr) * 2017-06-13 2021-03-17 Israel Aerospace Industries Ltd. Antenne conforme
US11575200B2 (en) 2018-08-01 2023-02-07 Israel Aerospace Industries Ltd. Conformal antenna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346865A (en) * 1964-12-10 1967-10-10 Jr Howard S Jones Slot antenna built into a dielectric radome
US3530478A (en) * 1968-03-27 1970-09-22 Us Navy Frequency independent log periodic slot multi-mode antenna array
US3914767A (en) * 1974-06-11 1975-10-21 Us Army Monolithic, electrically small, multi-frequency antenna
EP0047684A1 (fr) * 1980-09-05 1982-03-17 Thomson-Csf Antenne pour missile et missile comprenant une telle antenne
US4658261A (en) * 1985-01-25 1987-04-14 The United States Of America As Represented By The Secretary Of The Navy Circumferential slotted ridged waveguide array antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346865A (en) * 1964-12-10 1967-10-10 Jr Howard S Jones Slot antenna built into a dielectric radome
US3530478A (en) * 1968-03-27 1970-09-22 Us Navy Frequency independent log periodic slot multi-mode antenna array
US3914767A (en) * 1974-06-11 1975-10-21 Us Army Monolithic, electrically small, multi-frequency antenna
EP0047684A1 (fr) * 1980-09-05 1982-03-17 Thomson-Csf Antenne pour missile et missile comprenant une telle antenne
US4658261A (en) * 1985-01-25 1987-04-14 The United States Of America As Represented By The Secretary Of The Navy Circumferential slotted ridged waveguide array antenna

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741958A1 (fr) * 1995-12-04 1997-06-06 Aerospatiale Radioaltimetre protege contre diverses detections
EP0778632A1 (fr) * 1995-12-04 1997-06-11 Aerospatiale Societe Nationale Industrielle Radioaltimètre protégé contre diverses détections
US20140085143A1 (en) * 2012-09-27 2014-03-27 Raytheon Company Methods and apparatus for fragmented phased array radar
US9620866B2 (en) * 2012-09-27 2017-04-11 Raytheon Company Methods and apparatus for fragmented phased array radar
EP3639325A4 (fr) * 2017-06-13 2021-03-17 Israel Aerospace Industries Ltd. Antenne conforme
US11329398B2 (en) 2017-06-13 2022-05-10 Israel Aerospace Industries Ltd. Conformal antenna
US11575200B2 (en) 2018-08-01 2023-02-07 Israel Aerospace Industries Ltd. Conformal antenna

Also Published As

Publication number Publication date
GB8611504D0 (en) 1986-12-17
EP0250082A3 (fr) 1990-03-14

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Inventor name: SHEPPERD, JOHN NICHOLAS