Transmitting-receiving station having impedance-matched receiving means for transponder answer signals
AssigneeKoninklijke Philips Electronics N.V.
InventorSiegfried Arnold
Life of this patent
Estimating the term…
Abstract
A transmitting/receiving station is operable in a transmitting mode and a receiving mode. The transmitting/receiving station has a transmission coil circuit with a transmission coil and conductor having a given characteristic impedance, a first end, and a second end. The conductor has its second end connected to the transmission coil circuit and has its first end connected to transmitter means for generation of a request signal and to receiver for receiving an answer signal. Additional circuits are provided in order to guarantee that the first end of the conductor has a matched termination during the receiving mode.
Claims6
A transmitting/receiving station which is configured to cooperate with at least one transponder and by means of a which a transmitting mode and a receiving mode can be carried out and which comprises:
- a transmission coil circuit comprising a transmission coil for the communication with a transponder transmission coil provided in a transponder;
- conductor means having a given characteristic impedance, which conductor means have a first end and a second end and are connected to the transmission coil circuit at the location of the second end;
- transmitting means which are configured to generate a request signal which in a transmitting mode can be transmitted by the transmission coil and can be received by the transponder and which are connected to the conductor means at the location of the first end of the conductor means;
- receiving means which are configured to receive an answer signal produced in the transmitting/receiving station in response to a request signal received by the transponder and which are connected to the conductor means at the location of the first end of the conductor means;
- and
- additional means which are interposed between the transmitting means and the receiving means and the first end of the conductor means, by which additional means the transmitting means and the receiving means are connected to the first end of the conductor means and by which additional means the first end of the conductor means has a matched termination for the answer signal produced in the transmitting/receiving station.
Dependencies are inferred from the claim text.