EP0191031A1 - 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 interestInfo
- 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- Withdrawn
Links
- 238000003491 array Methods 0.000 claims description 13
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009313 farming Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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.Multidirectional antenna having high switching capacity with high RF power levels, consisting of three sub-rows (5, 6, 7) which, suitably spaced, provide angular coverage in the azimuthal hemispace between 0o and 180o . A single beam array (2, 3) gives each sub-row the correct field amplitude and phase distribution. The switching is carried out electronically.
Description
Claims
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 |
IT4853484 | 1984-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0191031A1 true EP0191031A1 (en) | 1986-08-20 |
Family
ID=11267149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85903361A Withdrawn EP0191031A1 (en) | 1984-07-09 | 1985-07-03 | Multibeam antenna, which can provide different beam positions according to the angular sector of interest |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0191031A1 (en) |
IT (1) | IT1179394B (en) |
WO (1) | WO1986000760A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2734410B1 (en) * | 1986-08-05 | 1997-07-25 | Thomson Csf Radant | MICROWAVE ANTENNA WITH RADIATION DIAGRAM SYNTHESIS |
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 (en) * | 1989-04-24 | 1994-12-21 | 三菱電機株式会社 | Electronic scanning array antenna device |
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 |
DE60032710T2 (en) * | 1999-11-03 | 2007-11-08 | Intel Corporation, Santa Clara | Router with room multiplex circuit for wireless data packets |
DE102014106060A1 (en) * | 2014-04-30 | 2015-11-19 | Karlsruher Institut für Technologie | antenna array |
Family Cites Families (3)
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 |
-
1984
- 1984-07-09 IT IT48534/84A patent/IT1179394B/en active
-
1985
- 1985-07-03 EP EP85903361A patent/EP0191031A1/en not_active Withdrawn
- 1985-07-03 WO PCT/IT1985/000015 patent/WO1986000760A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8600760A1 * |
Also Published As
Publication number | Publication date |
---|---|
IT8448534A0 (en) | 1984-07-09 |
IT1179394B (en) | 1987-09-16 |
WO1986000760A1 (en) | 1986-01-30 |
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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): AT BE CH DE FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19860726 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AT DE FR GB NL SE |
|
17Q | First examination report despatched |
Effective date: 19880324 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19940201 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RUSSO, PASQUALE Inventor name: SCARPETTA, ROSARIO |