RF ID Tag Reader and Method for Calibrating RF ID Tag Reader

摘要

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.