EP0048639B1 - Antenne légère, notamment pour radar, procédé pour sa fabrication, et installation s'y rapportant - Google Patents

Antenne légère, notamment pour radar, procédé pour sa fabrication, et installation s'y rapportant Download PDF

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Publication number
EP0048639B1
EP0048639B1 EP19810401248 EP81401248A EP0048639B1 EP 0048639 B1 EP0048639 B1 EP 0048639B1 EP 19810401248 EP19810401248 EP 19810401248 EP 81401248 A EP81401248 A EP 81401248A EP 0048639 B1 EP0048639 B1 EP 0048639B1
Authority
EP
European Patent Office
Prior art keywords
antenna
expanded material
source
assembly
block
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
Application number
EP19810401248
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0048639A1 (fr
Inventor
Alain Biolley
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.)
ALAIN BIOLLEY TE PLOGASTEL SAINT-GERMAIN, FRANKRIJ
Original Assignee
Delegation Generale pour lArmement
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 Delegation Generale pour lArmement filed Critical Delegation Generale pour lArmement
Publication of EP0048639A1 publication Critical patent/EP0048639A1/fr
Application granted granted Critical
Publication of EP0048639B1 publication Critical patent/EP0048639B1/fr
Expired 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
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave

Definitions

  • the present invention relates to a light antenna, in particular for radar.
  • the invention also relates to a method of manufacturing such an antenna, and to an installation using such a type of antenna.
  • Radar antennas generally use metallic materials, such as light alloys, and plastic materials for their construction. They are relatively heavy and require, for their rotary drive, expensive mechanisms involving precision gears and machined molded casings. The mechanical energy consumed to overcome their inertia or the stresses due to the wind or the possible movement of the part supporting the radar is also relatively large. In addition, their complexity requires frequent and careful maintenance.
  • the known antennas are of complex construction and need to be stiffened by plates of rigid material such as metal plates or screwed structures with rigid assembly.
  • US Pat. No. 3,324,474 shows an antenna whose rotating support is housed inside a mast and whose antenna itself comprises a supporting structure comprising metal flanges ensuring the rigidity of the assembly and enclosing plates of expanded material serving as spacers, the whole being assembled by retaining screws.
  • Patent FR 2 299 736 describes a YAGI antenna in which the source and the concentration means are produced in discrete elements housed in a body made of expanded material in two parts comprising hollow housings, the two parts being assembled by means of an adhesive. .
  • the rigidity of the assembly is obtained either by the dielectric if it is made of sintered ceramic, or by means of the molding box which is kept around the dielectric.
  • the present invention aims to achieve an antenna of very great lightness which frees it from significant mechanical constraints and which is of economical manufacture.
  • Another object of the invention is to produce an antenna composed exclusively of light materials without reinforcement of rigid plates or of complex assembly, the rigidity being then obtained only by the method of assembly by bonding of the source and means for concentrating on the dielectric material.
  • the light antenna in particular for radar, according to the invention comprising a source and means for concentrating electromagnetic energy forming developable surfaces, the source and the means of concentration of which are embedded in at least one block of expanded material of predetermined dielectric characteristics is characterized in that the blocks of expanded material constitute the supporting structure of the assembly.
  • the expanded material indeed constitutes an extremely light supporting structure, within which the metallic elements can be very thin and therefore also very light.
  • the source advantageously comprises a prismatic tube produced from a thin metal sheet.
  • the concentration means preferably comprise a prismatic horn made from a metallized film.
  • the block of expanded material comprises a certain number of assembled parts cooperating by bonding with the interior and exterior walls of the source and of the horn.
  • the expanded material is polystyrene, whose dielectric constant close to 1 facilitates calculations.
  • This manufacturing method is particularly economical since it uses only inexpensive materials and requires only low-skilled labor.
  • the radar installation using an antenna in accordance with the preceding description is characterized in that it comprises an assembly of two antennas, one being connected to the transmission device and the other to the receiving mixer.
  • the lightness and compactness of the antennas according to the invention makes it possible to assemble them easily, one being a transmitter and the other receiving. Duplication is by no means expensive because of the low cost of the antenna and also makes it possible to achieve significant savings by eliminating the plexer.
  • the block can be assembled around a mast, which eliminates the dead zone.
  • the removal of a support platform is also allowed by the lightness of the whole.
  • the invention also provides for housing the transmitter and its ancillary circuits in the blocks, as well as the receiver and its ancillary circuits, so that the microwave signals do not have to be routed via a rotating joint. .
  • the antenna comprises a source 1 constituted by a standard waveguide composed of a bottom 2 and a radiating face 3 in which are made slits 4.
  • the bottom 2 and the face 3 are made in brass foil of a tenth of a millimeter thick by cutting and folding on a template to the standards of the waveguide standardized in the IJ band
  • the bottom 2 and the face 3 are then assembled to form a prismatic tube with a rectangular base which rests on a block 5 of expanded polystyrene in the form of a prism with a trapezoidal base.
  • the assembly is covered with a metallized film 6 bonded to it to constitute the horn of the antenna.
  • this film is of the genre known as "mylar”.
  • Two blocks 7 of expanded polystyrene, in the form of a prism with a triangular base are glued to the faces of the horn and two prismatic blocks 8 with a rectangular base are glued to the side walls of the source 1 and to the blocks 7.
  • a plate 9 of expanded polystyrene is bonded to the bottom of the source and to the adjacent blocks 8.
  • the bottom 2 and the face 3 (fig. 3) by sticking on a foil sheet of paper where the fold and cut lines are drawn.
  • the slots 4 are cut out and the folding is carried out with the aid of a template.
  • the bottom 2 and the face 3 are then assembled by soldering with tin.
  • the source 1 thus produced is then placed on the block 5 and the whole of the metallized film 6 (FIG. 4) is covered which is glued.
  • the antenna obtained is centered on a frequency of 9,150 MHz.
  • fig. 6 there is shown its radiation diagram for 9,200 MHz. The ordinates are graduated in decibels and the abscissas in bearing angle.
  • the electric axis rotation is 1 ° per 100 MHz and the attenuation at 3 dB corresponds to a deposit opening of 1 °, 7.
  • the opening in site is 15 ° and the standing wave rate is less than or equal to 1.5 in a band between 9000 and 9250 MHz.
  • This antenna is remarkably light. This lightness makes it easy to couple a transmitting antenna and a receiving antenna, which saves the cost of a duplexer. One can even, while keeping a very reduced weight, place in the block the transmitter and the receiver with their auxiliary circuits. This arrangement makes it possible to avoid passing the microwave signals through a rotating joint.
  • the assembly of the two antennas can be provided removable, which allows it to be mounted around a mast and not on a platform. This avoids dead zones. Such an assembly is moreover favored by the lightness of the assembly which also makes it possible to avoid heavy and expensive drive mechanisms.
  • the block formed by the antenna, or the assembled antennas can have any profiled external shape, which can for example be integrated into the fuselage of a flying object.
  • this antenna is not limited to radar.

Landscapes

  • Details Of Aerials (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP19810401248 1980-09-22 1981-07-31 Antenne légère, notamment pour radar, procédé pour sa fabrication, et installation s'y rapportant Expired EP0048639B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8020296 1980-09-22
FR8020296A FR2490883A1 (fr) 1980-09-22 1980-09-22 Antenne legere, notamment pour radar, procede pour sa fabrication, et installation s'y rapportant

Publications (2)

Publication Number Publication Date
EP0048639A1 EP0048639A1 (fr) 1982-03-31
EP0048639B1 true EP0048639B1 (fr) 1985-02-06

Family

ID=9246143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810401248 Expired EP0048639B1 (fr) 1980-09-22 1981-07-31 Antenne légère, notamment pour radar, procédé pour sa fabrication, et installation s'y rapportant

Country Status (3)

Country Link
EP (1) EP0048639B1 (OSRAM)
DE (1) DE3168774D1 (OSRAM)
FR (1) FR2490883A1 (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10057441B4 (de) * 2000-11-20 2014-02-13 Vega Grieshaber Kg Hornantenne für ein Radargerät

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569016B1 (en) * 1992-05-07 1996-09-25 Hughes Aircraft Company Molded plastic microwave antenna
US6483476B2 (en) 2000-12-07 2002-11-19 Telex Communications, Inc. One-piece Yagi-Uda antenna and process for making the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324474A (en) * 1964-09-18 1967-06-06 Gen Dynamics Corp Rotatable horn antenna with feed moveable out of horn to form omnidirectional antenna
FR2085161B1 (OSRAM) * 1969-11-19 1973-12-21 Sfim
US3750185A (en) * 1972-01-18 1973-07-31 Westinghouse Electric Corp Dipole antenna array
DE2601494A1 (de) * 1975-01-28 1976-07-29 Plessey Handel Investment Ag Verfahren zur herstellung einer funkantenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10057441B4 (de) * 2000-11-20 2014-02-13 Vega Grieshaber Kg Hornantenne für ein Radargerät

Also Published As

Publication number Publication date
FR2490883A1 (fr) 1982-03-26
FR2490883B1 (OSRAM) 1984-12-21
EP0048639A1 (fr) 1982-03-31
DE3168774D1 (en) 1985-03-21

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