RF ID Tag Reader and Method for Calibrating RF ID Tag Reader
First Claim
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1. An RFID tag reader comprising:
- an antenna for communication with an RFID tag;
a high-frequency circuit that processes a signal for communication with the RFID tag;
a signal line that connects the antenna and the high-frequency circuit;
superimposing means for superimposing a control signal for impedance adjustment on a high-frequency signal outputted from the high-frequency circuit to the antenna to output a superimposed signal;
separating means for separating the superimposed signal inputted from the superimposing means through the signal line into the high-frequency signal and the control signal;
a matching circuit that subjects the high-frequency signal separated by the separating means to impedance matching and inputs the high-frequency signal to the antenna; and
adjusting means for controlling a circuit constant of the matching circuit on the basis of the control signal separated by the separating means.
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Abstract
A control unit of a reader superimposes a control signal for impedance adjustment on a high-frequency signal outputted from a high-frequency circuit to an antenna unit to output a superimposed signal. The antenna unit includes a separating unit that separates the superimposed signal into the high-frequency signal and the control signal, a matching circuit that subjects the high-frequency signal separated by the separating unit to impedance matching and input the high-frequency signal to an antenna, and an adjusting unit that controls a circuit constant of the matching circuit on the basis of the control signal separated by the separating unit.
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Citations
7 Claims
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1. An RFID tag reader comprising:
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an antenna for communication with an RFID tag; a high-frequency circuit that processes a signal for communication with the RFID tag; a signal line that connects the antenna and the high-frequency circuit; superimposing means for superimposing a control signal for impedance adjustment on a high-frequency signal outputted from the high-frequency circuit to the antenna to output a superimposed signal; separating means for separating the superimposed signal inputted from the superimposing means through the signal line into the high-frequency signal and the control signal; a matching circuit that subjects the high-frequency signal separated by the separating means to impedance matching and inputs the high-frequency signal to the antenna; and adjusting means for controlling a circuit constant of the matching circuit on the basis of the control signal separated by the separating means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for calibrating an RFID tag reader including an antenna for communication with an RFID tag, a high-frequency circuit that processes a signal for communication with the RFID tag, a signal line that connects the antenna and the high-frequency circuit, and an impedance matching circuit that subjects the antenna and the signal line to impedance matching, the method comprising:
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superimposing a control signal for impedance adjustment on a high-frequency signal outputted from the high-frequency circuit to the antenna and transmits a superimposed signal to the signal line; separating the superimposed signal transmitted on the signal line into the high-frequency signal and the control signal; and controlling a circuit constant of the impedance matching circuit on the basis of the separated control signal.
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Specification