Transceiving circuit for contactless communication and NFC device or RFID reader/writer device comprising such a transceiving circuit
First Claim
Patent Images
1. A transceiving circuit for contactless communication comprising:
- transmitter means configured to generate an electromagnetic carrier signal and to modulate the carrier signal for transmitting data;
an antenna, wherein the antenna is connected to the transmitter means and driven by the transmitter means using the modulated carrier signal;
a first impedance-matching capacitor formed in a first transmission path that is coupled to a first output terminal of the transmitter means;
a second impedance-matching capacitor formed in a second transmission path that is coupled to a second output terminal of the transmitter means;
a tapping point of a receiving path that is coupled to the first transmission path so that the tapping point is interposed between the first output terminal and the first impedance-matching capacitor;
a phase adjusting capacitor that is switched into the receiving path; and
an electromagnetic compatibility filter that is connected between the first and second output terminals of the transmitter means and the first and second impedance-matching capacitors, wherein the first impedance-matching capacitor is interposed between the tapping point and the antenna, wherein the antenna comprises first and second capacitors and an inductor, wherein the first and second capacitors are connected together in series and the inductor is coupled between the first and second impedance matching capacitors in parallel with the first and second capacitors.
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Abstract
A transceiving circuit (1, 1′) for contactless communication comprises transmitter means (3) being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to transmitting data, and an antenna (5) being connected to and driven by the transmitter means (3) with the modulated carrier signal. At least one impedance-matching capacitor (C1a) is arranged serially to the antenna (5).
16 Citations
15 Claims
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1. A transceiving circuit for contactless communication comprising:
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transmitter means configured to generate an electromagnetic carrier signal and to modulate the carrier signal for transmitting data; an antenna, wherein the antenna is connected to the transmitter means and driven by the transmitter means using the modulated carrier signal; a first impedance-matching capacitor formed in a first transmission path that is coupled to a first output terminal of the transmitter means; a second impedance-matching capacitor formed in a second transmission path that is coupled to a second output terminal of the transmitter means; a tapping point of a receiving path that is coupled to the first transmission path so that the tapping point is interposed between the first output terminal and the first impedance-matching capacitor; a phase adjusting capacitor that is switched into the receiving path; and an electromagnetic compatibility filter that is connected between the first and second output terminals of the transmitter means and the first and second impedance-matching capacitors, wherein the first impedance-matching capacitor is interposed between the tapping point and the antenna, wherein the antenna comprises first and second capacitors and an inductor, wherein the first and second capacitors are connected together in series and the inductor is coupled between the first and second impedance matching capacitors in parallel with the first and second capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transceiving circuit for contactless communication comprising:
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transmitter means configured to generate an electromagnetic carrier signal and to modulate the carrier signal for transmitting data; and an antenna that is connected to and driven by the transmitter means using the modulated carrier signal, wherein first and second transmission paths are connected between the antenna and corresponding first and second output terminals of the transmitter means, wherein the antenna comprises first and second inductors and an impedance matching capacitor connected in series between the first and second inductors, wherein a tapping point of a receiving path is connected to the first transmission path at a location that is between the first output terminal and the first inductor of the antenna, and wherein the second inductor is connected in series between the impedance matching capacitor and the second transmission line path. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification