RFID tag communication apparatus

摘要

A reader (1) comprises a housing (2) constituting an equipment shell including a bottom surface (3A) fixed in contact with a predetermined installation surface (F); an antenna (13) provided along the bottom surface (3A) at a distance h from the bottom surface (3A) that transmits and receives information by wireless communication with an RFID tag including an IC circuit part (150) that stores information and a tag antenna (151) that transmits and receives information; and a radio frequency circuit (131) including carrier wave transmitting means (132) for generating a carrier wave of a frequency fc for supplying power to the RFID tag, for transmitting and receiving information with the RFID tag; the frequency fc and the distance h being set to satisfy the correlation as: fo < fc < fm under the conditions that fm is set for a resonance frequency of the antenna (13) when the bottom surface (3A) is fixed in contact with the installation surface (F) made of a metal, and fo is set for a resonance frequency of the antenna (13) when the bottom surface (3A) is fixed in contact with the installation surface (F) made of a non-metal or the bottom surface (3A) is separated from the installation surface (F) resulting in a single unit state of the RFID tag communication apparatus (1).