RADIO-FREQUENCY COMMUNICATION DEVICE
First Claim
1. A radio-frequency communication device arranged to transmit a transmitted signal from a transmitter antenna device toward a communication object, and to receive through a receiver antenna device a reply signal transmitted from the communication object, for radio communication with the communication object, said radio-frequency communication device comprising:
- a transfer-function calculating portion configured to calculate a transfer function indicative of a relationship between a signal input to said transmitter antenna device and a signal generated by said receiver antenna device due to said signal input to said transmitter antenna device; and
a receiver-circuit-constant setting portion configured to set a receiver-circuit constant for improving a quality of said reply signal received by said receiver antenna device, on the basis of said transfer function calculated by said transfer-function calculating portion, and said signal input to said transmitter antenna device.
1 Assignment
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Accused Products
Abstract
A radio-frequency communication device arranged to transmit a transmitted signal from a transmitter antenna device toward a communication object, and to receive through a receiver antenna device a reply signal transmitted from the communication object, for radio communication with the communication object, the radio-frequency communication device including a transfer-function calculating portion operable to calculate a transfer function indicative of a relationship between a signal input to the transmitter antenna device and a signal generated by the receiver antenna device due to the signal input to the transmitter antenna device, and a receiver-circuit-constant setting portion operable to set a receiver-circuit constant for improving a quality of the reply signal received by the receiver antenna device, on the basis of the transfer function calculated by the transfer-function calculating portion, and the signal input to the transmitter antenna device.
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Citations
27 Claims
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1. A radio-frequency communication device arranged to transmit a transmitted signal from a transmitter antenna device toward a communication object, and to receive through a receiver antenna device a reply signal transmitted from the communication object, for radio communication with the communication object, said radio-frequency communication device comprising:
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a transfer-function calculating portion configured to calculate a transfer function indicative of a relationship between a signal input to said transmitter antenna device and a signal generated by said receiver antenna device due to said signal input to said transmitter antenna device; and
a receiver-circuit-constant setting portion configured to set a receiver-circuit constant for improving a quality of said reply signal received by said receiver antenna device, on the basis of said transfer function calculated by said transfer-function calculating portion, and said signal input to said transmitter antenna device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio-frequency communication device comprising:
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a carrier output portion including a carrier generating portion configured to generate a carrier wave for obtaining an access to a transponder, and a carrier modulating portion configured to modulate the carrier wave generated by said carrier generating portion, said carrier output portion outputting the carrier wave from said carrier generating portion or the modulated carrier wave from said carrier modulating portion;
a carrier transmitting portion configured to transmit the carrier wave from said carrier generating portion toward said transponder;
a signal receiving portion configured to receive a signal transmitted from said transponder in response to the carrier wave received from said carrier output portion;
a cancel-signal generating portion configured to generate a cancel signal for eliminating an unnecessary wave that is a part of the carrier wave transmitted from said carrier transmitting portion, which part is received by said signal receiving portion;
a signal-strength detecting portion configured to detect a strength of a received signal which is received by said signal receiving portion and from which said unnecessary wave is at least partially eliminated by said cancel signal generated by said cancel-signal generating portion; and
a cancel-signal control portion configured to control said carrier generating portion, said carrier transmitting portion and said cancel-signal generating portion, such that a phase and an amplitude of said cancel signal generated by said cancel-signal generating portion are changed and optimized, on the basis of the strength of said received signal which is detected by said signal-strength detecting portion when the received signal is received by said signal receiving portion while the carrier wave generated by said carrier generating portion is transmitted from said carrier transmitting portion, without transmission of the carrier wave modulated by said carrier modulating portion from said carrier transmitting portion. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification