EP 0237110 A1 19870916 - Direction-finding antenna system.
Title (en)
Direction-finding antenna system.
Title (de)
Peilantennensystem.
Title (fr)
Système d'antenne radiogoniométrique.
Publication
Application
Priority
GB 8605457 A 19860305
Abstract (en)
In a direction-finding antenna system comprising an array of elements (1-8) mutually spaced in at least one direction and feeder means for forming sum and difference radiation patterns, the contribution of outer elements (1,5;4,8) lying beyond the phase centres of the sub-arrays from which the sum pattern is formed, relative to the contribution of inner elements (2,6;3,7), is less to the difference pattern than to the sum pattern, in order that the magnitude of the difference pattern should exceed that of the sum pattern except in the region of the central null in the difference pattern. The invention is particularly applicable to a curved array of relatively small aperture, such as an IFF array mounted on a parabolic radar antenna reflector operating at a much higher frequency.
IPC 1-7
IPC 8 full level
G01S 13/44 (2006.01); G01S 3/32 (2006.01); H01Q 5/00 (2006.01); H01Q 25/02 (2006.01)
CPC (source: EP)
H01Q 5/45 (2015.01); H01Q 19/19 (2013.01); H01Q 25/02 (2013.01)
Citation (search report)
- [Y] US 3594811 A 19710720 - PIERROT ROBERT L
- [Y] EP 0021193 A1 19810107 - CONTRAVES ITALIANA SPA [IT]
- [A] DE 2737750 C1 19851031 - SIEMENS AG
- [A] EP 0012055 A1 19800611 - THOMSON CSF [FR]
- [A] EP 0013240 A1 19800709 - THOMSON CSF [FR]
- [A] US 4283729 A 19810811 - RICHARDSON PHILLIP N
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0237110 A1 19870916; AU 610061 B2 19910516; AU 6964487 A 19870910; JP S62272171 A 19871126
DOCDB simple family (application)
EP 87200343 A 19870226; AU 6964487 A 19870303; JP 4897287 A 19870305