(19)
(11) EP 0 474 440 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.07.1993 Bulletin 1993/27

(43) Date of publication A2:
11.03.1992 Bulletin 1992/11

(21) Application number: 91307965.3

(22) Date of filing: 30.08.1991
(51) International Patent Classification (IPC)5: G08G 1/017, G08B 13/24, H01Q 9/06
(84) Designated Contracting States:
DE ES FR IT NL SE

(30) Priority: 07.09.1990 GB 9019645

(71) Applicant: PLESSEY SEMICONDUCTORS LIMITED
Swindon, Wiltshire SN2 2QW (GB)

(72) Inventors:
  • Blunden, Peter Philip
    Reepham, Lincolnshire LN3 4EB (GB)
  • Williams, David Anthony
    Market Rasen, Lincolnshire LN8 3QL (GB)

(74) Representative: Hoste, Colin Francis 
The General Electric Company p.l.c. GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Moving vehicle transponder


    (57) A transponder tag operative in the UHF range and including a substrate of dielectric material having formed on one side a conductive surface providing a ground plane and a dipole antenna, a slot line within the ground plane forming a balanced antenna feeder and leading to the centre of the dipole antenna, and the substrate having mounted on the side of the substrate opposite to said one side a transmission line feeder positioned for electromagnetic coupling with said slot line, the transmission line feeder being coupled to transceiver circuit means and processing means mounted on the opposite side for performing a transponding function.






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