(19)
(11) EP 0 394 714 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.07.1991 Bulletin 1991/27

(43) Date of publication A2:
31.10.1990 Bulletin 1990/44

(21) Application number: 90106406.3

(22) Date of filing: 04.04.1990
(51) International Patent Classification (IPC)5: H01Q 1/24, H01Q 1/27
(84) Designated Contracting States:
AT BE CH DE DK FR GB IT LI NL

(30) Priority: 12.04.1989 DE 3912034

(71) Applicant: TEXAS INSTRUMENTS DEUTSCHLAND GMBH
D-85356 Freising (DE)

(72) Inventors:
  • Viereck,Bruno G.
    D-8051 Marzling Freising (DE)
  • Schuermann, Josef
    D-8051 Oberhummel (DE)

(74) Representative: Schwepfinger, Karl-Heinz, Dipl.-Ing. et al
Prinz & Partner, Manzingerweg 7
D-81241 München
D-81241 München (DE)


(56) References cited: : 
   
       


    (54) Identification device with inductive antenna coupling


    (57) The invention relates to an identification device (10) consisting of a transmitter and receiver section (12) and an antenna connected thereto via an antenna coupling (16). Known identification devices are awkward to handle and trouble-prone in particular under rough use conditions. The new identification device is to be suitable in particular for mobile use and remain functionable even under rough ambient conditions. For this purpose in the antenna coup­ling (16) a dividable transformer (18) is arranged, a first transformer half having a core (20) and a winding (21) being accommodated in the transmitter and receiver section (12) and a second transformer half having a core (22) and a winding (23) being accommodated in the antenna (14). The two windings (21, 23) are inductively coupled in the con­nected state of the transmitter and receiver section (12) and the antenna (14).







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