GB581457A - Improvements in or relating to aerial systems - Google Patents

Improvements in or relating to aerial systems

Info

Publication number
GB581457A
GB581457A GB1159644A GB1159644A GB581457A GB 581457 A GB581457 A GB 581457A GB 1159644 A GB1159644 A GB 1159644A GB 1159644 A GB1159644 A GB 1159644A GB 581457 A GB581457 A GB 581457A
Authority
GB
United Kingdom
Prior art keywords
reflector
paraboloid
disc
reflection
cheese
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
GB1159644A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1159644A priority Critical patent/GB581457A/en
Publication of GB581457A publication Critical patent/GB581457A/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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/025—Means for reducing undesirable effects for optimizing the matching of the primary feed, e.g. vertex plates

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

581,457. Aerials. PIPPARD, A. B. June 17, 1944, No. 11596. [Class 40 (v)] In a directional aerial system comprising a reflector, mismatch of the associated radiating or receiving element due to energy reflected back to the element from the reflector, is minimised by so shaping the reflector that the reflection of energy back to the radiating or receiving element from one portion of the reflector is substantially counter-balanced by the reflection from the remainder of the reflector. For the case of a paraboloid 1, shown as being fed by a wave guide 4, the modification of shape is produced by a disc of conducting material 2, of diameter D = #4F#/3 where F is the focal length of the paraboloid and A is the wavelength, located at - the centre of the paraboloid. To obtain the correct phase of reflection from the disc its reflecting surface should be a distance l= # /8 from the apex 3 of 8 the reflector and. this condition is satisfied if the disc is of thickness t = #/24 and its rim is in contact with the paraboloid. The disc may also be located so that its reflecting surface is in front of or behind the defined position by one or more half wavelengths. The invention is stated to be applicable to spherical reflectors and parabolic '' cheese " reflectors, in which case the correction is produced by a flat plate extending across the thickness of the " cheese ".
GB1159644A 1944-06-17 1944-06-17 Improvements in or relating to aerial systems Expired GB581457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1159644A GB581457A (en) 1944-06-17 1944-06-17 Improvements in or relating to aerial systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1159644A GB581457A (en) 1944-06-17 1944-06-17 Improvements in or relating to aerial systems

Publications (1)

Publication Number Publication Date
GB581457A true GB581457A (en) 1946-10-14

Family

ID=9989151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1159644A Expired GB581457A (en) 1944-06-17 1944-06-17 Improvements in or relating to aerial systems

Country Status (1)

Country Link
GB (1) GB581457A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133284A (en) * 1959-03-02 1964-05-12 Rca Corp Paraboloidal antenna with compensating elements to reduce back radiation into feed
US3162858A (en) * 1960-12-19 1964-12-22 Bell Telephone Labor Inc Ring focus antenna feed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133284A (en) * 1959-03-02 1964-05-12 Rca Corp Paraboloidal antenna with compensating elements to reduce back radiation into feed
US3162858A (en) * 1960-12-19 1964-12-22 Bell Telephone Labor Inc Ring focus antenna feed

Similar Documents

Publication Publication Date Title
GB663166A (en) Improvements in or relating to antenna
US2370053A (en) Directive antenna system
US5121129A (en) EHF omnidirectional antenna
US2342721A (en) Parabolic reflector
US2273447A (en) Unidirective energy radiating system
US3430244A (en) Reflector antennas
US3792480A (en) Aerials
GB973583A (en) Improvements in or relating to microwave aerials
US4208661A (en) Antenna with two orthogonally disposed parabolic cylindrical reflectors
US3332083A (en) Cassegrain antenna with offset feed
US4223316A (en) Antenna structure with relatively offset reflectors for electromagnetic detection and space telecommunication equipment
GB330750A (en) Arrangement for influencing the rau?ation of electric waves
US2540518A (en) Directional antenna
US2609505A (en) Aerial system
GB581457A (en) Improvements in or relating to aerial systems
GB1268341A (en) Improvements in parabolic antennas
US2530079A (en) Directive antenna system
US2607010A (en) Wave guide antenna system
US2644092A (en) Antenna
GB1342892A (en) Aircraft antennas
JPS5773506A (en) Common antenna for multifrequency band
Chu Microwave beam-shaping antennas
US2555123A (en) Directional antenna
GB1366259A (en) Wide-band electromagnetic wave reflectors
US2440210A (en) Antenna