(19)
(11) EP 0 434 268 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.08.1991 Bulletin 1991/34

(43) Date of publication A2:
26.06.1991 Bulletin 1991/26

(21) Application number: 90313290.0

(22) Date of filing: 07.12.1990
(51) International Patent Classification (IPC)5: H01Q 9/04, H01Q 21/00, H01Q 21/06
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 19.12.1989 GB 8928589

(71) Applicants:
  • SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
    London SW1A 2HB (GB)
  • THORN EMI Electronics Limited
    Hayes Middlesex UB3 1DL (GB)

(72) Inventors:
  • Smith, Alan Christopher
    Great Malvern, Worcestershire (GB)
  • Owens, Roger Philip
    Wedmore, Somerset (GB)

(74) Representative: Charlton, Peter John et al
Elkington and Fife Beacon House 113 Kingsway
London WC2B 6PP
London WC2B 6PP (GB)


(56) References cited: : 
   
       


    (54) Microstrip antenna


    (57) The invention relates to a microstrip antenna (2) for radiating or receiving circularly polarised radiation. The antenna (2) includes an array of radiation elements (4), a first feed means (12) coupled to the elements (4) in a manner for effecting circular polarisation in a first sense of signals afforded to the elements (4), and further feed means (14) arranged in a non-overlapping relationship with respect to the first feed means (12) and coupled to the elements (4) in a manner for effecting circular polarisation in the opposite sense of signals afforded to the elements (4).






    Search report