Transmitting and receiving system
First Claim
1. A transmitting and receiving system, comprising:
- transmitting and receiving means for transmitting a question signal; and
a transponder that receives the question signal when coupled to the transmitting and receiving means, the transponder generating a response signal with a first change of an impedance value of a transmitting and receiving portion of the transponder in response to the question signal, wherein if the response signal is not received by the transmitting and receiving means after transmitting the question signal, then the transmitting and receiving means transmits a correction command signal and the transponder responds to the correction command signal by generating the response signal with a second change of the impedance value of the transmitting and receiving portion of the transponder.
2 Assignments
0 Petitions
Accused Products
Abstract
A transmitting and receiving system including, a transponder always maintains a transmission function even if circuit constants of circuit elements are deviated or such circuit constants are shifted in association with temperature changes. The transponder includes a transponder coil electromagnetically coupled to an antenna coil through which a response signal is transmitted, a resonance capacitor, a main modulation circuit including a first modulation capacitor, and a supplemental modulation circuit including a second modulation capacitor whose static capacitance value is different from that of the first modulation capacitor. A response signal is transmitted in changing an impedance of a transmitting and receiving portion by the main modulation circuit when a question signal is received and by the supplemental modulation circuit when a correction command signal is received.
18 Citations
15 Claims
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1. A transmitting and receiving system, comprising:
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transmitting and receiving means for transmitting a question signal; and a transponder that receives the question signal when coupled to the transmitting and receiving means, the transponder generating a response signal with a first change of an impedance value of a transmitting and receiving portion of the transponder in response to the question signal, wherein if the response signal is not received by the transmitting and receiving means after transmitting the question signal, then the transmitting and receiving means transmits a correction command signal and the transponder responds to the correction command signal by generating the response signal with a second change of the impedance value of the transmitting and receiving portion of the transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification