EP0191031A1 - Antenne multidirectionnelle pouvant fournir differentes positions de faisceaux en fonction du secteur angulaire considere - Google Patents

Antenne multidirectionnelle pouvant fournir differentes positions de faisceaux en fonction du secteur angulaire considere

Info

Publication number
EP0191031A1
EP0191031A1 EP85903361A EP85903361A EP0191031A1 EP 0191031 A1 EP0191031 A1 EP 0191031A1 EP 85903361 A EP85903361 A EP 85903361A EP 85903361 A EP85903361 A EP 85903361A EP 0191031 A1 EP0191031 A1 EP 0191031A1
Authority
EP
European Patent Office
Prior art keywords
sub
multibeam antenna
provide different
antenna
different beam
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Withdrawn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
EP85903361A
Other languages
German (de)
English (en)
Inventor
Rosario Scarpetta
Pasquale Russo
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.)
Leonardo SpA
Original Assignee
Selenia Industrie Elettroniche Associate SpA
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 Selenia Industrie Elettroniche Associate SpA filed Critical Selenia Industrie Elettroniche Associate SpA
Publication of EP0191031A1 publication Critical patent/EP0191031A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture

Definitions

  • This invention concerns a multibeam antenna which has a high switching capability with high RF power levels.
  • the invention may find, application in the field of electronic defence systems fay tackling single or multiple threats arriving from different directions.
  • the antenna can provide pseudo adaptability to the radar cross section, as it is made up of three sub arrays, each of which includes eight elementary equispaced radiators which assure angular coverage of the azimuth emispace from 0° to 180°, fed by a single beamshaping network which provides the correct field amplitude and phase distribution.
  • the emispace is therefore divided into-three angular sectors, each of which a sub array is associated. Switching between these angular sectors and within each sector is electronic.
  • Each sub array shapes three beams which take different angular positions on the azimuth plane through the same feed network. The selection of these beams is electronic upon designation by the system which assesses relevant direction of arrival.
  • One of the previous solutions was to utilize arrays fed by Rothman lenses or by Butler matrixes.
  • An other solution was provided by a series of directional antennas, one for each beam to shape, fed by a n way switch (as many ways as the number of beams) or by transmitters.
  • the antenna which is the subject of this invention, consists of three sub arrays (5), (6), (7) which suitably spaced, can assure angular coverage in the 0° : 180° azimuth emispace. ( In a specular manner, three more sub arrays, fed by a separate transmitter, can assure angle coverage in the other 180° : 360° azimuth emispace).
  • the three sub arrays are fed by a single beamforming network which provides for the correct field amplitude & phase distribution to each subarray.
  • the emispace is thus divided into three angle sectors, to each one of which a sub array is associated. Switching between these angular sectors is performed electronically and within each sector; the relevant sub array forms three beams which take different angle directions on the azimuth plane through the same feed network.
  • the beam switching and farming network consists of solid state components to obtain the high switching speeds (100-150 nsec) which are required to satisfy the tasks set on the system.
  • the gain of each beam, required to established the necessary effective radiated power is achieved by providing the array with a directivity also in the vertical plane. This can be achieved by using as an element of the array a sectorial horn radiator, over the aperture of which a phase correcting dielectric lens is placed, which enhances radiation efficiency.
  • a most interesting characteristic of this indicating system is that of directing the beam to the desired direction in negligible times. This is achieved through:
  • the transmitting antenna is made up of two specular subassemblies each covering a 180° sector. It may be installed, in its preferred configuration, on board a ship ( Figure 1).
  • Figure 1 Schematic representation of the system fitted on board a ship.
  • Figure 5 Delay line phase shifter, indicated as a whole with numbers (2) (3) (4) in Figure 3.
  • Figure 6 Piirt circuit, where d stands for the desired direction, 3a, 3c and 4 are the signals which enable each relevant block 3a, 3c and 4. (Figure 2) to deliver RF power in the desired directi ⁇ n.
  • Figure 7 Detail of one of the sub arrays where X, Y, Z are the reference system;
  • (5a) is the radiating element
  • (9) is the dielectric lens for field phase correction over the varying element
  • the antenna systems operation will be described: the input RF signal (1) is split by the power divider (2) into eight parts, which are sent to the delay line phase shifter (3).
  • the delay live phase shifter (3) provides the correct phase illumination to sub array (5) or (6) or (7) to radiate the RF signal in the desired direction.
  • Such phase shifter consists of delay lines (36) either coaxial or triplate to assure stability in the radiation direction over the whole range of frequencies of operation.
  • the switching network (selector) (4) which follows the phase shifter (3) switches the predetermined distribution onto one of the three sub arrays (5), (6), (7) which are geometrically set to achieve the coverage required (0° : 180°).
  • the commands to the delay line phase shifter (3) and to the switching network (sub array selector) (4) are provided in parallel to the pilot circuit (8) as a function of the desired position of the beam.
  • This pilot circuit can select the output signals, corresponding to the input signal, required to drive the beam selectors 3a & 3c and the sub array selector (4) and then to deliver RF power in the desired direction.
  • the insertion loss of the phase shifting splitting & switching network is ⁇ dB so that the antenna gain, inclusive of losses, is 18 dB.
  • the centre subarray ( Figure 3) covers the angular sector from 67.5° to 112.5°, while the two sub arrays (5), (7), cover each0°:67.5° and 112.5°: 180°. This gain distribution may be exploited to make the antenna system pseudoadaptive to ship R.C.S. for a more effective electronic defence (ECM) of the same.
  • ECM electronic defence
  • This adaptation provides the antenna system also with a pseudoadapting capability to the ship radar cross section, as in the angular sector where this is larger, there is a larger array gain and therefore higher effective radiated power, known in leterature as ERP.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

Antenne multidirectionnelle possédant une grande capacité de commutation avec des niveaux de puissance HF élevés, se composant de trois sous-rangées (5, 6, 7) lesquelles, espacées de manière appropriée, assurent une couverture angulaire dans l'hémiespace azimutal entre 0o et 180o. Un réseau formant un faisceau unique (2, 3) confère à chaque sous-rangée l'amplitude de champ et la distribution de phase correctes. La commutation est effectuée électroniquement.
EP85903361A 1984-07-09 1985-07-03 Antenne multidirectionnelle pouvant fournir differentes positions de faisceaux en fonction du secteur angulaire considere Withdrawn EP0191031A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT48534/84A IT1179394B (it) 1984-07-09 1984-07-09 Antenna multifascio in grado di realizzare posizioni di fascio diverse in funzione del settore angolare di interesse
IT4853484 1984-07-09

Publications (1)

Publication Number Publication Date
EP0191031A1 true EP0191031A1 (fr) 1986-08-20

Family

ID=11267149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903361A Withdrawn EP0191031A1 (fr) 1984-07-09 1985-07-03 Antenne multidirectionnelle pouvant fournir differentes positions de faisceaux en fonction du secteur angulaire considere

Country Status (3)

Country Link
EP (1) EP0191031A1 (fr)
IT (1) IT1179394B (fr)
WO (1) WO1986000760A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734410B1 (fr) * 1986-08-05 1997-07-25 Thomson Csf Radant Antenne hyperfrequence a synthese de diagramme de rayonnement
US4766438A (en) * 1987-02-27 1988-08-23 Hughes Aircraft Company Three dimensional feed through lens with hemispherical coverage
JPS6478177A (en) * 1987-09-21 1989-03-23 Nec Corp Landing guiding device
JPH06105959B2 (ja) * 1989-04-24 1994-12-21 三菱電機株式会社 電子走査形アレイアンテナ装置
US5025493A (en) * 1989-06-02 1991-06-18 Scientific-Atlanta, Inc. Multi-element antenna system and array signal processing method
US4973971A (en) * 1989-12-18 1990-11-27 Allied-Signal Inc. Broadband circular phased array antenna
GB2356096B (en) * 1991-03-12 2001-08-15 Siemens Plessey Electronic Method of operating a radar antenna system
US5552798A (en) * 1994-08-23 1996-09-03 Globalstar L.P. Antenna for multipath satellite communication links
EP1098455B1 (fr) * 1999-11-03 2007-01-03 Intel Corporation Routeur avec de la communation spatiale pour des paquets de données transmis sans fil
DE102014106060A1 (de) * 2014-04-30 2015-11-19 Karlsruher Institut für Technologie Antennenanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816830A (en) * 1970-11-27 1974-06-11 Hazeltine Corp Cylindrical array antenna
GB1553916A (en) * 1975-06-09 1979-10-10 Commw Scient Ind Res Org Modulation of scanning radio beams
US4124852A (en) * 1977-01-24 1978-11-07 Raytheon Company Phased power switching system for scanning antenna array

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8600760A1 *

Also Published As

Publication number Publication date
IT1179394B (it) 1987-09-16
WO1986000760A1 (fr) 1986-01-30
IT8448534A0 (it) 1984-07-09

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Inventor name: SCARPETTA, ROSARIO