RFID-tag communication device
First Claim
1. An RFID-tag communication device including an antenna from which a transmission signal is transmitted toward an RFID tag and through which a reply signal transmitted from the RFID tag in response to the transmission signal is received, for radio communication with the RFID tag, said RFID-tag communication device comprising:
- a first-cancel-signal output portion operable to generate a digital first cancel signal for suppressing a leakagel signal from a received signal which is received through said antenna and which contains said leakage signal as well as said rely signal, said leakage signal being a part of said transmission signal which is transmitted from said antenna and which is returned to and received by said antenna;
a first-cancel-signal control portion operable to control an amplitude and/or a phase of said first cancel signal generated by said first-cancel-signal output portion;
a first-cancel-signal D/A converting portion operable to convert said first cancel signal generated by said first-cancel-signal output portion, into an analog signal; and
a first signal combining portion operable to combine together the analog first cancel signal generated by said first-cancel-signal D/A converting portion, and said received signal, to obtain a first composite signal.
1 Assignment
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Accused Products
Abstract
An RFID-tag communication device including (a) an antenna from which a transmission signal is transmitted toward an RFID tag and through which a reply signal transmitted from the RFID tag in response to the transmission signal is received, for radio communication with the RFID tag, (b) a first-cancel-signal output portion operable to generate a digital first cancel signal for suppressing a leakagel signal from a received signal which is received through the antenna and which contains the leakage signal as well as the rely signal, the leakage signal being a part of the transmission signal which is transmitted from the antenna and which is returned to and received by the antenna, (c) a first-cancel-signal control portion operable to control an amplitude and/or a phase of the first cancel signal generated by the first-cancel-signal output portion, (d) a first-cancel-signal D/A converting portion operable to convert the first cancel signal generated by the first-cancel-signal output portion, into an analog signal, (e) a first signal combining portion operable to combine together the analog first cancel signal generated by the first-cancel-signal D/A converting portion, and the received signal, to obtain a first composite signal.
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Citations
34 Claims
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1. An RFID-tag communication device including an antenna from which a transmission signal is transmitted toward an RFID tag and through which a reply signal transmitted from the RFID tag in response to the transmission signal is received, for radio communication with the RFID tag, said RFID-tag communication device comprising:
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a first-cancel-signal output portion operable to generate a digital first cancel signal for suppressing a leakagel signal from a received signal which is received through said antenna and which contains said leakage signal as well as said rely signal, said leakage signal being a part of said transmission signal which is transmitted from said antenna and which is returned to and received by said antenna;
a first-cancel-signal control portion operable to control an amplitude and/or a phase of said first cancel signal generated by said first-cancel-signal output portion;
a first-cancel-signal D/A converting portion operable to convert said first cancel signal generated by said first-cancel-signal output portion, into an analog signal; and
a first signal combining portion operable to combine together the analog first cancel signal generated by said first-cancel-signal D/A converting portion, and said received signal, to obtain a first composite signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification