Communication system, and interrogator and transponder of the system
First Claim
1. A communication system comprising:
- a plurality of interrogators; and
at least one transponder operable, upon reception of an interrogating wave transmitted from each of said interrogators, to respond to said each of said interrogators with a reflected wave which is generated by modulating the interrogating wave, wherein each of said interrogators is operable to communicate with the other of said interrogators in a wireless manner.
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Accused Products
Abstract
A communication system including: (a) a plurality of interrogators; and (b) at least one transponder operable, upon reception of an interrogating wave transmitted from each of the interrogators, to respond to the interrogator with a reflected wave which is generated by modulating the interrogating wave. Each of the interrogators is operable to communicate with the other of the interrogators in a wireless manner. A frequency band of the reflected wave transmitted from the transponder to each of the interrogators is preferably separated from a frequency band of a communication wave transmitted from the interrogator to the other of the interrogators, and is preferably closer to a frequency of the interrogating wave transmitted from the interrogator to the transponder, than the frequency band of the communication wave.
15 Citations
21 Claims
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1. A communication system comprising:
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a plurality of interrogators; and
at least one transponder operable, upon reception of an interrogating wave transmitted from each of said interrogators, to respond to said each of said interrogators with a reflected wave which is generated by modulating the interrogating wave, wherein each of said interrogators is operable to communicate with the other of said interrogators in a wireless manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 20, 21)
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10. An interrogator providing each of a plurality of interrogators which cooperate with at least one transponder to constitute a communication system, in which each of said interrogators is operable to transmit a main carrier wave to the transponder and to transmit a communication wave to the other of said interrogators, while the transponder is operable, upon receipt of the main carrier -wave transmitted from said each of said interrogators, to respond with a reflected wave generated by modulating the main carrier wave with a response data signal, said interrogator comprising:
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a transmission data signal generator operable to generate a transmission data signal based on information that is to be transmitted to the other of said interrogators, such that a frequency band of the generated transmission data signal is different from a frequency band of the response data signal;
a main carrier modulator operable to generate a transmission-data-signal modulated wave, by modulating the main carrier wave with the transmission data signal which has been supplied from said transmission data signal generator;
a transmitter operable to transmit the communication wave containing the main carrier wave and the transmission-data-signal modulated wave which have been supplied from said main carrier modulator; and
a receiver operable to receive the reflected wave and the communication wave which have been transmitted from the transponder and the other of said interrogators, respectively. - View Dependent Claims (11, 12, 13, 17)
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14. An interrogator providing each of a plurality of interrogators which cooperate with at least one transponder to constitute a communication system, in which each of said interrogators is operable to transmit a main carrier wave to the transponder and to transmit a communication wave to the other of said interrogators, while the transponder is operable, upon receipt of the main carrier wave transmitted from said each of said interrogators, to respond with a reflected wave generated by modulating the main carrier wave with a response data signal, said interrogator comprising:
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a transmission data signal generator operable to generate a transmission data signal based on information that is to be transmitted to the other of said interrogators;
a main carrier modulator operable to generate a transmission-data-signal modulated wave, by modulating the main carrier wave with the transmission data signal which has been supplied from said transmission data signal generator, and to output the main carrier and the generated transmission-data-signal modulated wave having components whose respective frequency bands lie on opposite sides of a frequency of the main carrier wave;
a filter operable to pass, among an output supplied from the main carrier modulator, the main carrier wave and one of the components of the transmission-data-signal modulated wave, and to reject the other of the components of the transmission-data-signal modulated wave;
a transmitter operable to transmit the communication wave containing the main carrier wave and the one of the components of the generated modulated wave, which have been supplied from said filter; and
a receiver operable to receive the reflected wave and the communication wave which have been transmitted from the transponder and the other of said interrogators, respectively. - View Dependent Claims (15, 16)
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Specification