GB1218351A - Improvements in or relating to aerial systems - Google Patents

Improvements in or relating to aerial systems

Info

Publication number
GB1218351A
GB1218351A GB463567A GB463567A GB1218351A GB 1218351 A GB1218351 A GB 1218351A GB 463567 A GB463567 A GB 463567A GB 463567 A GB463567 A GB 463567A GB 1218351 A GB1218351 A GB 1218351A
Authority
GB
United Kingdom
Prior art keywords
reflector
region
sub
axial section
central portion
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
GB463567A
Inventor
Eric Lawrence Casling White
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB463567A priority Critical patent/GB1218351A/en
Publication of GB1218351A publication Critical patent/GB1218351A/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

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

1,218,351. Aerials. ELECTRIC & MUSICAL INDUSTRIES Ltd. 31 Jan., 1968 [31 Jan., 1967], No. 4635/67. Heading H4A. In a Cassegrain aerial system having a primary feed 1, a sub-reflector 22, and a main reflector 13, said sub-reflector has a central portion of conical form, a region of concave curvature in axial section adjacent and around said central portion, and a region of convex curvature in axial section adjacent and around said region of concave curvature. The semi-angle # of said central conical portion may be from 75 to 88 degrees, and a further region of concave curvature in axial section may be adjacent to, and lie around, said region of convex curvature. The shaping of the sub-reflector 22 in this way modifies the distribution of energy over the surface of the main reflector 13, and a central portion A-A<SP>1</SP> thereof, upon which substantially no energy is directed, may be omitted. A prior art arrangement is described in which a conical dielectric member extends from a primary feed horn to the surface of a sub-reflector (Fig. 3, not shown).
GB463567A 1967-01-31 1967-01-31 Improvements in or relating to aerial systems Expired GB1218351A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB463567A GB1218351A (en) 1967-01-31 1967-01-31 Improvements in or relating to aerial systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB463567A GB1218351A (en) 1967-01-31 1967-01-31 Improvements in or relating to aerial systems

Publications (1)

Publication Number Publication Date
GB1218351A true GB1218351A (en) 1971-01-06

Family

ID=9780882

Family Applications (1)

Application Number Title Priority Date Filing Date
GB463567A Expired GB1218351A (en) 1967-01-31 1967-01-31 Improvements in or relating to aerial systems

Country Status (1)

Country Link
GB (1) GB1218351A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102846A1 (en) * 1982-09-07 1984-03-14 Andrew Corporation Dual reflector microwave antenna
DE3533204A1 (en) * 1985-09-18 1987-03-19 Standard Elektrik Lorenz Ag ANTENNA WITH A MAIN REFLECTOR AND AUXILIARY REFLECTOR
CN104205498A (en) * 2012-04-02 2014-12-10 古野电气株式会社 Antenna

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102846A1 (en) * 1982-09-07 1984-03-14 Andrew Corporation Dual reflector microwave antenna
DE3533204A1 (en) * 1985-09-18 1987-03-19 Standard Elektrik Lorenz Ag ANTENNA WITH A MAIN REFLECTOR AND AUXILIARY REFLECTOR
CN104205498A (en) * 2012-04-02 2014-12-10 古野电气株式会社 Antenna
EP2835868A4 (en) * 2012-04-02 2015-10-07 Furuno Electric Co Antenna
US9472856B2 (en) 2012-04-02 2016-10-18 Furuno Electric Co., Ltd. Antenna
CN104205498B (en) * 2012-04-02 2018-07-17 古野电气株式会社 Antenna

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