Global Patent Index - EP 0190927 A3

EP 0190927 A3 19880824 - SLOTTED WAVEGUIDE ANTENNAS AND ARRAYS

Title (en)

SLOTTED WAVEGUIDE ANTENNAS AND ARRAYS

Publication

EP 0190927 A3 19880824 (EN)

Application

EP 86300779 A 19860205

Priority

  • GB 8503055 A 19850207
  • GB 8505198 A 19850228

Abstract (en)

[origin: EP0190927A2] Array antennas constructed from some forms of waveguide radiators with sidewall slots exhibit cross polarisation and periodic errors. This problem arises from the difficulty of obtaining phase reversal in the radiation from adjacent slots in such a radiator other than by slot inclination. The present invention offers two solutions. Firstly, a radiator 10 having a number of non-inclined sidewall slots such as 13 and 14 and a septum 15 with inclined slots such as 25 and 26 which provide a phase relationship in the radiation from the sidewall slots which ensures that no significant cross polarisation errors nor grating lobes occur. A number of radiators 10 can be used to form an array. Secondly, arrays using radiators with sidewall slots, in which the distance between these slots, the dimensions of the radiators and the relative positions of individual radiators are such that the phase relationship in radiation from the slots of the array prevent significant grating lobes.

IPC 1-7

H01Q 21/06; H01Q 13/10

IPC 8 full level

H01Q 21/00 (2006.01)

CPC (source: EP)

H01Q 21/0043 (2013.01)

Citation (search report)

  • [Y] US 3720953 A 19730313 - AJIOKA J
  • [A] DE 1441741 A1 19691009 - LAB FOR ELECTRONICS INC
  • [Y] IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. AP-32, no. 3, March 1984, pages 247-251, IEEE, New York, US; J.S.AJIOKA et al.: "Slot radiators in septated waveguide"
  • [A] IEEE TRANSACTIONS OF ANTENNAS AND PROPAGATION, vol. AP-22, no. 2, March 1974, pages 196-200, IEEE, New York, US; J.AJIOKA et al.: "Arbitrarily polarized slot radiators in bifurcated waveguide arrays"
  • [A] IEE PROC., vol. 129, Pt. H, no. 6, December 1982, pages 299-306; A.J.SANGSTER et al.: "Moment method analysis of a T-shaped slot radiator in bifurcated waveguide"

Designated contracting state (EPC)

DE FR GB IT NL SE

DOCDB simple family (publication)

EP 0190927 A2 19860813; EP 0190927 A3 19880824; GB 2170959 A 19860813; GB 8602840 D0 19860312

DOCDB simple family (application)

EP 86300779 A 19860205; GB 8602840 A 19860205