Patent ID: 6219530
Filing Date: 2001-04-17
Classification: G06K,H04B

Abstract:
A communication station (1) which is arranged for contactless communication with at least one transponder, andis provided with a transmission coil configuration (2) with an active, first transmission coil circuit (3) which includes a first transmission coil (4) wherethrough a coil current can be driven, and with a passive, second transmission coil circuit (7) which includes a second transmission coil (8) which is oriented essentially parallel to the first transmission coil (4), is arranged opposite the first transmission coil (4) and is inductively coupled to the first transmission coil (4) a coil current which has been phase shifted essentially 90.degree. with respect to the coil current that can be driven through the first transmission coil (4) being drivable through said second transmission coil as a result of the inductive coupling to the first transmission coil (4), andis also provided with transmission means (21) which are arranged to generate a transmission signal (TS) and are connected to the first transmission coil circuit (3), andalso with first receiving means (32) which are connected to the first transmission coil circuit (3) and are arranged to receive a first receiving signal (RS1) obtained by means of the first transmission coil circuit (3), andalso with evaluation means (19) which are connected to the first receiving means (32) and whereby received data, corresponding to the first receiving signal (RS1) received by the first receiving means (32), can be evaluated, characterized in thatthe transmission coil configuration (2) is additionally provided with an active, third transmission coil circuit (11) which includes a third transmission coil (12) which is oriented transversely of the first transmission coil (4), is arranged so as to be offset relative to the first transmission coil (4), and through which there can be driven a coil current which has one of two phase angles relative to the coil current that can be driven through the first transmission coil (4), the two phase angles being 0.degree. or 180.degree., and that the transmission means (21) and the first receiving means (32) are also connected to the third transmission coil circuit (11).