WO1986000760A1 - Multibeam antenna, which can provide different beam positions according to the angular sector of interest - Google Patents

Multibeam antenna, which can provide different beam positions according to the angular sector of interest Download PDF

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Publication number
WO1986000760A1
WO1986000760A1 PCT/IT1985/000015 IT8500015W WO8600760A1 WO 1986000760 A1 WO1986000760 A1 WO 1986000760A1 IT 8500015 W IT8500015 W IT 8500015W WO 8600760 A1 WO8600760 A1 WO 8600760A1
Authority
WO
WIPO (PCT)
Prior art keywords
multibeam antenna
sub
provide different
antenna
different beam
Prior art date
Application number
PCT/IT1985/000015
Other languages
French (fr)
Inventor
Rosario Scarpetta
Pasquale Russo
Original Assignee
Selenia, Industrie Elettroniche Associate
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 filed Critical Selenia, Industrie Elettroniche Associate
Publication of WO1986000760A1 publication Critical patent/WO1986000760A1/en

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24Arrangements 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements 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

Multibeam antenna, which has a high switching capability with high RF power levels, consisting of three sub arrays (5, 6, 7) which suitably spaced, assure angular coverage in the azimuth hemispace from 0o to 180o. A single beam forming network (2, 3) provides each sub-array with the correct field amplitude and phase distribution. Switching is performed electronically.

Description

"MULTIBEAM ANTENNA, WHICH CAN PROVIDE DIFFERENT BEAM POSITIONS ACCORDING TO THE ANGULAR SECTOR OF INTEREST"
This invention concerns a multibeam antenna which has a high switching capability with high RF power levels.
It belonges to the field of electronically switched beam antennas. 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, as mentioned above, 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. These solutions have a number of drawbacks, among which: - proliferation of the number of transmitters, with consequential cost and dimensions increase; - low- switching speed, for the switching network, due tα the high RF levels at stake. 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.
Selection of these beams is in turn electronic, upon indication from the designating system, i.e. the system which descerns the threat or threats direction of arrival. 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:
- high switching times with high total RF power radiated;
- high effective radiated power associated to each single beam;
- azimuth coverage over the whole round angle using two radiating systems, each having a 0° to 180° coverage sector;
- capability to adapt to the number of beams of the designating system. This gives the antenna system the capability to tackle multiple threats.
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).
The invention will now be described with reference to one of its forms presently preferred and provided as an illustration, but not limited to such form, with reference to figures and diagrams attached. Figure 1 : Schematic representation of the system fitted on board a ship.
Figure 2: Functional schematic of the antenna, consisting
- Transmitter (1)
- Power divider (2) - Delay line phase shifter (3) where 3a and 3c are beam selectors and 3b are the delay lines
- Sub array selector (4)
- Three sub arrays (5) (6) (7)
- Pilot circuit (8) Figure 3: Block diagram of the antenna system where:
(4) switching network (sub array selector); (3) delay line phase shifter;
(2) power splitter;
(5) (6) (7) sub arrays; Figure 4r Power splitter (noted as (2) in Figure 3). Here numbers 1 to 8 indicate the RF signal outputs and IN is the input signal.
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 directiσn. 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;
(10) is the polarization converter. Figure 8: Correspondence between the three sub arrays angular coverage and the designating system's angular coverage. With reference to the figures, 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 δ dB so that the antenna gain, inclusive of losses, is 18 dB. For each subassy, nine beam positions are achieved. 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. The uniqueners of this antenna system consists essentially in:
- the use of the array principle to switch large RF powers rapidly over different angular directions (100 : 150 nsec); - the adaptation to the designating system through the use of a single transmitter associated to a single feed network which manages three subarrays to cover the angular emispace.
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.

Claims

1. Multibeam antenna which can provide different beam positions, where these positions are acquired in very short times, with high RF power, characterized by including arpower splitter (2), a delay line phase shifter (3) a sub array selector (4) and three sub arrays (5), (6), (7).
2. Multibeam antenna, as per claim 1, characterized by furthermore including a pilot circuit (6) which has the task of commanding the delay line phase shifter (3) and the sub array (4) to deliver the RF power in the desired direction.
3. Multibeam antenna, as per claims above, inclusive also of three sub arrays fed by a single splitting, phasing and switching network which provide different angle coverage.
4. Multibeam antenna, as per previous descriptions, drawings and claims above, in its wholeness and single components.
PCT/IT1985/000015 1984-07-09 1985-07-03 Multibeam antenna, which can provide different beam positions according to the angular sector of interest WO1986000760A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT48534/84A IT1179394B (en) 1984-07-09 1984-07-09 MULTI-BAND ANTENNA ABLE TO REALIZE DIFFERENT BEAM POSITIONS ACCORDING TO THE ANGULAR SECTOR OF INTEREST
IT48534A/84 1984-07-09

Publications (1)

Publication Number Publication Date
WO1986000760A1 true WO1986000760A1 (en) 1986-01-30

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IT (1) IT1179394B (en)
WO (1) WO1986000760A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006808A2 (en) * 1987-02-27 1988-09-07 Hughes Aircraft Company Three dimensional feed through lens with hemispherical coverage
FR2621397A1 (en) * 1987-09-21 1989-04-07 Nec Corp GUIDE EQUIPMENT FOR MICROWAVE LANDING SYSTEM
FR2646563A1 (en) * 1989-04-24 1990-11-02 Mitsubishi Electric Corp ELECTRONIC SCANNING TYPE ANTENNA DEVICE
WO1991001620A2 (en) * 1989-06-02 1991-02-21 Scientific Atlanta, Inc. Multi-element antenna system and array signal processing method
WO1991009433A1 (en) * 1989-12-18 1991-06-27 Allied-Signal Inc. Broadband circular phased array antenna
EP0698972A1 (en) * 1994-08-23 1996-02-28 Loral Qualcomm Satellite Services, Inc. Antenna for multipath satellite communication links
GB2314687A (en) * 1986-08-05 1998-01-07 Thomson Csf Radant Microwave antenna with synthesized radiation diagram
GB2356096A (en) * 1991-03-12 2001-05-09 Siemens Plessey Electronic Radar antenna system
EP1098455A2 (en) * 1999-11-03 2001-05-09 CALY Corporation Spatially switched router for wireless data packets
DE102014106060A1 (en) * 2014-04-30 2015-11-19 Karlsruher Institut für Technologie antenna array

Citations (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
US4124852A (en) * 1977-01-24 1978-11-07 Raytheon Company Phased power switching system for scanning antenna array
GB1553916A (en) * 1975-06-09 1979-10-10 Commw Scient Ind Res Org Modulation of scanning radio beams

Patent Citations (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 (2)

* Cited by examiner, † Cited by third party
Title
Conference on Aerospace Antennas, 8-10 June 1971, IEEE, London R.H.J. CARY: "An Airborne Electronically Scanned X Band Narrow Beam Circular Antenna Array", pages 19-24; see figure 1; paragraph 2 *
Conference Proceedings; 12th european Microwave Conference; 13-17 September 1982, Helsinki, Finland G. SEEHAUSEN: "Feed System for Spherical Antenna Arrays with Amplitude Control", pages 661-666, see the whole document *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314687A (en) * 1986-08-05 1998-01-07 Thomson Csf Radant Microwave antenna with synthesized radiation diagram
GB2314687B (en) * 1986-08-05 1998-05-13 Thomson Csf Radant Microwave antenna with synthesized radiation pattern
WO1988006808A3 (en) * 1987-02-27 1988-09-22 Hughes Aircraft Co Three dimensional feed through lens with hemispherical coverage
WO1988006808A2 (en) * 1987-02-27 1988-09-07 Hughes Aircraft Company Three dimensional feed through lens with hemispherical coverage
FR2621397A1 (en) * 1987-09-21 1989-04-07 Nec Corp GUIDE EQUIPMENT FOR MICROWAVE LANDING SYSTEM
FR2646563A1 (en) * 1989-04-24 1990-11-02 Mitsubishi Electric Corp ELECTRONIC SCANNING TYPE ANTENNA DEVICE
WO1991001620A2 (en) * 1989-06-02 1991-02-21 Scientific Atlanta, Inc. Multi-element antenna system and array signal processing method
WO1991001620A3 (en) * 1989-06-02 1991-05-16 Scientific Atlanta Multi-element antenna system and array signal processing method
WO1991009433A1 (en) * 1989-12-18 1991-06-27 Allied-Signal Inc. Broadband circular phased array antenna
GB2356096A (en) * 1991-03-12 2001-05-09 Siemens Plessey Electronic Radar antenna system
GB2356096B (en) * 1991-03-12 2001-08-15 Siemens Plessey Electronic Method of operating a radar antenna system
US6531980B1 (en) 1991-03-12 2003-03-11 Airsys Atm Limited Radar antenna system
AU688901B2 (en) * 1994-08-23 1998-03-19 Loral Qualcomm Satellite Services, Inc. Antenna for multipath satellite communication links
US5552798A (en) * 1994-08-23 1996-09-03 Globalstar L.P. Antenna for multipath satellite communication links
EP0698972A1 (en) * 1994-08-23 1996-02-28 Loral Qualcomm Satellite Services, Inc. Antenna for multipath satellite communication links
EP1098455A2 (en) * 1999-11-03 2001-05-09 CALY Corporation Spatially switched router for wireless data packets
EP1098455A3 (en) * 1999-11-03 2003-08-06 Radiant Networks Plc Spatially switched router for wireless data packets
DE102014106060A1 (en) * 2014-04-30 2015-11-19 Karlsruher Institut für Technologie antenna array

Also Published As

Publication number Publication date
IT1179394B (en) 1987-09-16
IT8448534A0 (en) 1984-07-09
EP0191031A1 (en) 1986-08-20

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