GB1167598A - Improvements in or relating to Reflectors for Circularly Polarised Electro-Magnetic Waves - Google Patents

Improvements in or relating to Reflectors for Circularly Polarised Electro-Magnetic Waves

Info

Publication number
GB1167598A
GB1167598A GB57621/67A GB5762167A GB1167598A GB 1167598 A GB1167598 A GB 1167598A GB 57621/67 A GB57621/67 A GB 57621/67A GB 5762167 A GB5762167 A GB 5762167A GB 1167598 A GB1167598 A GB 1167598A
Authority
GB
United Kingdom
Prior art keywords
reflector
equals
sense
circularly polarized
waves
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
GB57621/67A
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1167598A publication Critical patent/GB1167598A/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

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

1,167,598. Aerials. CSF-COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. 19 Dec., 1967 [30 Dec., 1966], No. 57621/67. Heading H4A. A radio wave reflector element consists of a metal conductor made up of three sections AB, BC, CD, Fig. 1, each of which is perpendicular to the other two. AB equals CD, each being less than #/2, where # is the working wavelength, BC equals #/2 x (¢+n). where n is zero or a whole number, and AB + BC + CD equals #/2 x N, where N is a whole number. Thus, AB or CD equals (2(N - n) - 1) #/8. The element reflects waves directed along its axis BC if they are circularly polarized in one sense, but transmits them if they are circularly polarized in the opposite sense. A plurality of elements may be mounted in a block M, Fig. 6, of dielectric material, such as foamed plastics, to make up a reflector structure. Such a structure may be curved, and in one embodiment (Fig. 7, not shown) a Cassegrain type aerial is described in which a primary radiator launches clockwise circularly polarized waves towards a sub-reflector which changes their sense of polarization to anti-clockwise. The waves are then reflected from a main reflector without change of sense of polarization, and pass through the sub-reflector as a collimated beam.
GB57621/67A 1966-12-30 1967-12-19 Improvements in or relating to Reflectors for Circularly Polarised Electro-Magnetic Waves Expired GB1167598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR89609A FR1512598A (en) 1966-12-30 1966-12-30 circularly polarized resonant elements and semi-transparent reflector composed of these elements

Publications (1)

Publication Number Publication Date
GB1167598A true GB1167598A (en) 1969-10-15

Family

ID=8623246

Family Applications (1)

Application Number Title Priority Date Filing Date
GB57621/67A Expired GB1167598A (en) 1966-12-30 1967-12-19 Improvements in or relating to Reflectors for Circularly Polarised Electro-Magnetic Waves

Country Status (5)

Country Link
US (1) US3500420A (en)
CH (1) CH510940A (en)
FR (1) FR1512598A (en)
GB (1) GB1167598A (en)
SE (1) SE332019B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192309A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflectors
GB2192308A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflective bodies

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1240572B (en) * 1990-11-15 1993-12-17 Aeritalia Spa POLARIZATION DISCRIMINATOR DEVICE FOR CIRCULAR POLARIZATION ELECTROMAGNETIC WAVES AND DICHROIC SIPERPHICS INCLUDING A PLURALITY OF SUCH DEVICES
US9391374B2 (en) 2012-07-09 2016-07-12 Jasmin ROY Reciprocal circular polarization selective surfaces and elements thereof
US10224637B2 (en) 2012-07-09 2019-03-05 Jasmin ROY Reciprocal circular polarization selective surfaces and elements thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736895A (en) * 1951-02-16 1956-02-28 Elliott Brothers London Ltd High frequency radio aerials
US2867801A (en) * 1953-09-14 1959-01-06 Elliott Brothers London Ltd High frequency radio aerials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192309A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflectors
GB2192308A (en) * 1977-12-16 1988-01-06 Elliott Bros Energy reflective bodies

Also Published As

Publication number Publication date
SE332019B (en) 1971-01-25
US3500420A (en) 1970-03-10
CH510940A (en) 1971-07-31
FR1512598A (en) 1968-02-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee