Global Patent Index - EP 0141281 A3

EP 0141281 A3 19860730 - DEVICE FOR PREVENTING A MAIN BEAM PARALLAX IN A CIRCULARLY POLARIZED ANTENNA CAMPRISING A CURVED REFLECTOR AND AN OFF-SET PRIMARY RADIATING ELEMENT

Title (en)

DEVICE FOR PREVENTING A MAIN BEAM PARALLAX IN A CIRCULARLY POLARIZED ANTENNA CAMPRISING A CURVED REFLECTOR AND AN OFF-SET PRIMARY RADIATING ELEMENT

Publication

EP 0141281 A3 19860730 (DE)

Application

EP 84111833 A 19841003

Priority

DE 3336452 A 19831006

Abstract (en)

[origin: EP0141281A2] In the feed waveguide (7) to the antenna-horn emitter (8) waves of a higher mode than the fundamental are coupled in by means of a mode coupler (6) having an external signal input (5). The said waves have the same amplitude, but are in anti-phase to waves of that mode which would result in the same interfering main beam deflection as is actually caused by the curved reflector. A correction signal is applied to the external signal input of the mode coupler, this correction signal being derived from the fundamental signal in the feed waveguide by means of a coupler (3) and being adjusted to match, in terms of its phase and amplitude, by means of a correction network (4) in a correction signal path, so that broadband excitation of the anti-phase compensation wave is possible. The device according to the invention is suitable for application to satellite and directional radio antennas. <IMAGE>

IPC 1-7

H01Q 19/13

IPC 8 full level

H01Q 19/13 (2006.01); H01Q 25/04 (2006.01)

CPC (source: EP)

H01Q 19/132 (2013.01); H01Q 25/04 (2013.01)

Citation (search report)

  • [Y] GB 1525514 A 19780920 - RUDGE A, et al
  • [Y] DE 1953083 A1 19700514 - HUGHES AIRCRAFT CO
  • [A] FR 1449265 A 19660812 - ASS ELECT IND
  • [A] NTG-FACHBERICHTE, "ANTENNEN", NTG-Fachtagung, 8.-11. März 1977, Bad Nauheim, DE, Band 57, Seiten 86-90, VDE-Verlag GmbH, Berlin, DE; G. MÖRZ: "Ein neues Mehrmoden-Speisesystem zur elektrisch gesteuerten Strahlschwenkung bei parabolischen Reflektorantennen"
  • [A] PATENTS ABSTRACTS OF JAPAN, Band 3, Nr. 26 (E-95), 6. March 1979, Seite 15 E 95; & JP-A-54 004 049 (NIPPON DENSHIN DENWA KOSHA) 01-12-1979

Designated contracting state (EPC)

AT BE CH FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0141281 A2 19850515; EP 0141281 A3 19860730; DE 3336452 A1 19850502; DE 3336452 C2 19870924

DOCDB simple family (application)

EP 84111833 A 19841003; DE 3336452 A 19831006