GB716939A - Improvements in or relating to high frequency radio aerials - Google Patents

Improvements in or relating to high frequency radio aerials

Info

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
Application number
GB2118052A
Inventor
Peter Frederick Mariner
Charles Alexander Cochrane
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London Ltd
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
Priority to GB388451A priority Critical patent/GB700868A/en
Priority to US271679A priority patent/US2736895A/en
Application filed by Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Priority to GB2118052A priority patent/GB716939A/en
Publication of GB716939A publication Critical patent/GB716939A/en
Expired legal-status Critical Current

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.
GB2118052A 1951-02-16 1952-08-22 Improvements in or relating to high frequency radio aerials Expired GB716939A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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