GB716939A - Improvements in or relating to high frequency radio aerials - Google Patents
Improvements in or relating to high frequency radio aerialsInfo
- Publication number
- GB716939A GB716939A GB2118052A GB2118052A GB716939A GB 716939 A GB716939 A GB 716939A GB 2118052 A GB2118052 A GB 2118052A GB 2118052 A GB2118052 A GB 2118052A GB 716939 A GB716939 A GB 716939A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- plate
- strips
- horn
- auxiliary reflector
- 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
Links
Classifications
-
- 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
- H01Q19/195—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 wherein a reflecting surface acts also as a polarisation filter or a polarising device
-
- 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
- H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
716,939. Aerials. ELLIOTT BROS. (LONDON), Ltd. Aug. 24, 1953 [Aug. 22, 1952], No. 21180/52. Addition to 700,868. Class 40 (7) The invention consists of a radio aerial system of the type described in the parent Specification wherein the auxiliary reflector placed in front of the waveguide horn source collimates the waves and directs them through the half-wave plate to the main reflector which reflects them back through the " plate." The plate rotates the plane of polarization of the waves through 90 degrees and enables them to pass back through the auxiliary reflector, and the main reflector and halfwave plate are mounted so that they may be inclined to the axis of the auxiliary reflector. In the embodiment shown, energy is propagated along waveguide 2 having shorter sides 2a and radiated by horn 3 in the direction of auxiliary reflector 4. Reflector 4 comprises a number of flat parallel metallic strips 5 arranged in a solid dielectric supporting medium with their edges nearest the horn 3 contained in a paraboloidal surface. The spacing between adjacent strips 5 is somewhat less than half a wavelength and they are located in planes parallel to the walls 2a so that energy from the horn is reflected as a parallel beam towards the main reflector 1 which is apertured to receive the primary element 3. Above the reflector 1 is placed a half-wave plate 7 with its parallel metallic strips 8 in planes at 45 degrees to those containing the strips 5. The beam passes through the half-wave plate, is reflected by the reflector 1, and then passes back through the plate, suffering a total change in its plane of polarization of 90 degrees which enables it to pass out through auxiliary reflector 4 without substantial loss. The main reflector 1 and halfwave plate 7 are secured together to form a reflecting unit which is mounted on trunnions 10 received in bearings 11 in a frame 12 so that the unit can rotate about an axis parallel with the front edges of strips 8. The frame 12 is itself provided with trunnions 14 supported in bearings 15 in a fixed support so that angular movement of the reflecting unit is possible about two axes at right angles. The movement may be effected by operating motor 17 coupled to a cam followed by finger device 19, and motor 21 directly driving trunnion 15. The auxiliary reflector 4 may constitute the front portion of an aircraft radome and the half-wave plate be constructed in " eggbox " form if desired.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB388451A GB700868A (en) | 1952-08-22 | 1951-02-16 | Improvements in or relating to high frequency radio aerials |
US271679A US2736895A (en) | 1951-02-16 | 1952-02-15 | High frequency radio aerials |
GB2118052A GB716939A (en) | 1952-08-22 | 1952-08-22 | Improvements in or relating to high frequency radio aerials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2118052A GB716939A (en) | 1952-08-22 | 1952-08-22 | Improvements in or relating to high frequency radio aerials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB716939A true GB716939A (en) | 1954-10-20 |
Family
ID=10158524
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB388451A Expired GB700868A (en) | 1951-02-16 | 1951-02-16 | Improvements in or relating to high frequency radio aerials |
GB2118052A Expired GB716939A (en) | 1951-02-16 | 1952-08-22 | Improvements in or relating to high frequency radio aerials |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB388451A Expired GB700868A (en) | 1951-02-16 | 1951-02-16 | Improvements in or relating to high frequency radio aerials |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB700868A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3448455A (en) * | 1964-03-20 | 1969-06-03 | Thomson Houston Comp Francaise | Armoured structure antenna |
EP0015815A1 (en) * | 1979-03-02 | 1980-09-17 | Thomson-Csf | Microwave reflector with parallel strips and method of manufacturing such a reflector |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1015869B (en) * | 1956-01-16 | 1957-09-19 | Iapatelholdia Patentverwertung | Directional antenna |
US7183990B2 (en) * | 2004-02-04 | 2007-02-27 | Ems Technologies Canada Ltd | Aperture illumination control membrane |
-
1951
- 1951-02-16 GB GB388451A patent/GB700868A/en not_active Expired
-
1952
- 1952-08-22 GB GB2118052A patent/GB716939A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3448455A (en) * | 1964-03-20 | 1969-06-03 | Thomson Houston Comp Francaise | Armoured structure antenna |
EP0015815A1 (en) * | 1979-03-02 | 1980-09-17 | Thomson-Csf | Microwave reflector with parallel strips and method of manufacturing such a reflector |
FR2450508A1 (en) * | 1979-03-02 | 1980-09-26 | Thomson Csf | PARALLEL BLADE REFLECTOR FOR MICROWAVE ANTENNAS AND METHOD FOR MANUFACTURING SUCH A REFLECTOR |
Also Published As
Publication number | Publication date |
---|---|
GB700868A (en) | 1953-12-09 |
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