US3500427A - Steerable antenna system - Google Patents
Steerable antenna system Download PDFInfo
- Publication number
- US3500427A US3500427A US598146A US3500427DA US3500427A US 3500427 A US3500427 A US 3500427A US 598146 A US598146 A US 598146A US 3500427D A US3500427D A US 3500427DA US 3500427 A US3500427 A US 3500427A
- Authority
- US
- United States
- Prior art keywords
- scanning
- radiating elements
- panel
- gain
- antenna
- 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 - Lifetime
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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
- H01Q3/26—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
- H01Q3/30—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 varying the relative phase between the radiating elements of an array
- H01Q3/34—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 varying the relative phase between the radiating elements of an array by electrical means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
- H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
-
- 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
- H01Q3/2658—Phased-array fed focussing structure
-
- 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
- H01Q3/30—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 varying the relative phase between the radiating elements of an array
Definitions
- the present invention relates to antennas for scanning an angular space portion with a highly directive beam. More particularly, it relates to antennas with electronic scanning, formed by a panel of radiating elements excited with different phases. The dimensions of the panel depend, as is well known, on the gain to be obtained and on the operating wavelength.
- the distance between radiating elements must be such that recombination lobes do not occur in undesired directions; it is smaller than the wavelength.
- the number of radiating elements is therefore considerable, when the gain to be obtained is high, and this results in a complex antenna.
- a steerable antenna system for sweeping a first given angular space portion with a first radiation lobe having a high gain, said system comprising in association first aerial means comprising a plurality of radiating elements and controllable phase shifters, for sweeping a second given angular space portion greater than said first portion, with a lobe having a relatively low gain, and an electromagnetic optical system having a high magnification ratio.
- FIG. 1 shows an embodiment of an application of the invention to an antenna with small electronic scanning in elevation and large in azimuth
- FIG. 2 is a diagram showing the principle of optics used in the ambodiment according to the invention.
- FIG. 3a and 3b show in greater detail the arrangement of various elements of FIG. 1;
- FIG. 4 shows diagrammatically the arrangement of the reflectors in another embodiment
- FIG. 5 shows an example of a panel of radiating elements.
- a small panel S of radiating elements capable of scanning a large solid angle (40", for example) but with low gain is associated with an optical highfrequency system whose angular magnification makes it possible to obtain a limited scanning with a substantial gain.
- This system may consist theoretically of two highfrequency lenses or of one lens and one reflector, or of two substantially cofocal reflectors. This last solution will be adopted normally and will be described and illustrated in the following.
- FIG. 1 is a section along the vertical plane of symmetry of an embodiment of an antenna according to the invention, in the case of a large scanning in azimuth and small scanning in elevation.
- the panel S of radiating elements has therefore a small height h and a comparatively large length (perpendicular to the plane of FIG. 1) so that in the azimuth, where the optical system does not cause any reduction in the range scanned by the radiating elements, the gain is high.
- the radiating elements are arranged in offset, and a small reflector r and a large reflector R are used.
- the scanning in azimuth is obtained directly electronically, by creating a phase gradient between the radiating elements of the same horizontal row of the panel.
- the scanning in elevation angle is effected both by electronic scanning and according to the principle of the telescope, as shown in FIG. 2.
- a source of parallel rays with the height d illuminates a focussing system L with the focal length 1, whose image focus coincides with the object focus of a second focussing system L with the focal length f.
- the emerging rays are parallel and seem to come from a source with the height f'/f is the magnification of the instrument.
- the incident rays are inclined at an angle a
- the intermediate image is formed at F and the emergent beam is inclined at the angle a. so that The telescope transforms the aperture in direct proportion to its magnification and the scanning angle in inverse proportion.
- the effective scanning in elevation will be equal to 1/ G times the primary scanning, effected electronically for the panel of radiating elements and due to the vertical phase gradient, and the gain in elevation will be substantially equal to G times that of the panel of radiating elements along.
- the directrix of the reflector r is substantially an ellipse with the foci and at the centre of the radiating elements on the one hand, and substantially at the centre of the main reflector R on the other hand, the directrix of reflector R being substantially parabolic.
- FIG. 3a and FIG. 3b Two arrangements are possible. These are shown FIG. 3a and FIG. 3b respectively.
- FIG. 3a ' arrangement of FIG. 3a is adopted, which permits to compensate the aberrations of the optical system.
- FIG. 1 may therefore also be considered as a vertical cross-section of the antenna under the assumption that R and r are plane sections of a paraboloid and of an elipsoid, re-
- FIGURE 5 is shown schematically a panel of radiating elements and phase-shifters which, in association with an electromagnet optical system of magnification equal to 5 is capable of scanning the space with a beam of 2 aperture in both direction over an azimuthal range of 50 and an elevation range of 10.
- This panel, S comprises twelve rows of each sixty radiating dipoles, respectively S to 5 S to 5 S to S and respective phase-shifters Ph to Ph associated respectively with said radiating elements.
- the arrows C and E respectively represents the phaseshifter control system and the energy feed of the radiating elements.
- the oflset arrangement may be eliminated by using a semi-transparent reflector r and a reflector R causing a change in the direction of polarization, wherein the arrangement of FIG. 3b is utilized as shown in FIG. 4. It is also possible to use two optical assemblies arranged symetrically relative to the panel of radiating elements, wherein the reflectors, such as R, are associated with recombination prisms such as indicated in the patent application filed by the applicants on Mar. 23, 1966, Ser. No. 536,880, now U.S. Patent No. 3,430,246, Improved Two-reflectors Antenna.
- a steerable antenna system for sweeping a first given angular space portion with a first radiation lobe having a high gain, said system comprising in association first aerial means comprising a plurality of radiating sources and controllable phase-shifters, for sweeping a second given angular space portion greater than said first portion, with a lobe having a relatively low gain, and an electromagnetic optical system having a high magnification ratio comprising at least a first and a second elementary electromagnetic optical confocal device, said first device being located on the path of said lobe.
- a system according to claim 1 wherein said optical system comprises elements which are constituted of portions of second order surfaces.
- optical system comprises elements which are constituted of portions of cylindrical surfaces.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR39946 | 1965-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3500427A true US3500427A (en) | 1970-03-10 |
Family
ID=8593549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US598146A Expired - Lifetime US3500427A (en) | 1965-11-26 | 1966-11-28 | Steerable antenna system |
Country Status (5)
Country | Link |
---|---|
US (1) | US3500427A (de) |
DE (1) | DE977749C (de) |
FR (1) | FR1569560A (de) |
GB (1) | GB1172686A (de) |
NL (1) | NL6616630A (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2919628A1 (de) * | 1978-05-17 | 1979-11-22 | Western Electric Co | Multireflektor-antennenanordnung |
US4250508A (en) * | 1979-04-26 | 1981-02-10 | Bell Telephone Laboratories, Incorporated | Scanning beam antenna arrangement |
DE3341284A1 (de) * | 1982-11-17 | 1984-05-17 | Mitsubishi Denki K.K., Tokio/Tokyo | Antennenanlage mit zwei reflektoren |
US5038147A (en) * | 1988-11-03 | 1991-08-06 | Alcatel Espace | Electronically scanned antenna |
US9747480B2 (en) | 2011-12-05 | 2017-08-29 | Adasa Inc. | RFID and robots for multichannel shopping |
US9780435B2 (en) | 2011-12-05 | 2017-10-03 | Adasa Inc. | Aerial inventory antenna |
US10050330B2 (en) | 2011-12-05 | 2018-08-14 | Adasa Inc. | Aerial inventory antenna |
US10476130B2 (en) | 2011-12-05 | 2019-11-12 | Adasa Inc. | Aerial inventory antenna |
US10846497B2 (en) | 2011-12-05 | 2020-11-24 | Adasa Inc. | Holonomic RFID reader |
US11093722B2 (en) | 2011-12-05 | 2021-08-17 | Adasa Inc. | Holonomic RFID reader |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2548836B1 (fr) * | 1983-07-08 | 1986-02-21 | Thomson Csf | Antenne a couverture quasi torique a deux reflecteurs |
FR2588422A1 (fr) * | 1985-10-08 | 1987-04-10 | Thomson Csf | Antenne a balayage electronique ayant un nombre reduit d'elements rayonnants et de dephaseurs, et un angle de balayage restreint |
DE3738705A1 (de) * | 1987-11-14 | 1989-05-24 | Licentia Gmbh | Anordnung zur veraenderung der keulenbreite einer mikrowellenantenne |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3150371A (en) * | 1960-01-15 | 1964-09-22 | Beam Guidance Inc | Electromagnetic wave transmission systems |
US3170158A (en) * | 1963-05-08 | 1965-02-16 | Rotman Walter | Multiple beam radar antenna system |
-
1965
- 1965-11-26 FR FR39946A patent/FR1569560A/fr not_active Expired
-
1966
- 1966-11-25 NL NL6616630A patent/NL6616630A/xx unknown
- 1966-11-25 GB GB53021/66A patent/GB1172686A/en not_active Expired
- 1966-11-26 DE DEC40790A patent/DE977749C/de not_active Expired
- 1966-11-28 US US598146A patent/US3500427A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3150371A (en) * | 1960-01-15 | 1964-09-22 | Beam Guidance Inc | Electromagnetic wave transmission systems |
US3170158A (en) * | 1963-05-08 | 1965-02-16 | Rotman Walter | Multiple beam radar antenna system |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2919628A1 (de) * | 1978-05-17 | 1979-11-22 | Western Electric Co | Multireflektor-antennenanordnung |
US4203105A (en) * | 1978-05-17 | 1980-05-13 | Bell Telephone Laboratories, Incorporated | Scanable antenna arrangements capable of producing a large image of a small array with minimal aberrations |
US4250508A (en) * | 1979-04-26 | 1981-02-10 | Bell Telephone Laboratories, Incorporated | Scanning beam antenna arrangement |
DE3341284A1 (de) * | 1982-11-17 | 1984-05-17 | Mitsubishi Denki K.K., Tokio/Tokyo | Antennenanlage mit zwei reflektoren |
US5038147A (en) * | 1988-11-03 | 1991-08-06 | Alcatel Espace | Electronically scanned antenna |
US9747480B2 (en) | 2011-12-05 | 2017-08-29 | Adasa Inc. | RFID and robots for multichannel shopping |
US9780435B2 (en) | 2011-12-05 | 2017-10-03 | Adasa Inc. | Aerial inventory antenna |
US10050330B2 (en) | 2011-12-05 | 2018-08-14 | Adasa Inc. | Aerial inventory antenna |
US10476130B2 (en) | 2011-12-05 | 2019-11-12 | Adasa Inc. | Aerial inventory antenna |
US10846497B2 (en) | 2011-12-05 | 2020-11-24 | Adasa Inc. | Holonomic RFID reader |
US11093722B2 (en) | 2011-12-05 | 2021-08-17 | Adasa Inc. | Holonomic RFID reader |
Also Published As
Publication number | Publication date |
---|---|
DE977749C (de) | 1969-08-07 |
GB1172686A (en) | 1969-12-03 |
FR1569560A (de) | 1969-06-06 |
NL6616630A (de) | 1969-02-25 |
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