PROBLEM TO BE SOLVED: To consider that, although crosstalk obstacles are given to a UHF band RFID and a reader due to interference of a wave of a portable telephone or a portable telephone base station using the same frequency band, and for the purpose of eliminating those obstacles, intrusion of waves limited to a frequency band used by the RFID and the reader into a section where the RFID and the reader are used is prevented, the band used by the RFID is a part of a UHF band used by the portable telephone, and to provide a countermeasure by which the wave countermeasure does not interfere with communication of the portable telephone using the other frequency.;SOLUTION: A section where an RFID and a reader are placed is surrounded by a wave absorber and a metal plate, and intrusion into the section of an electromagnetic wave generated by a portable telephone and a portable telephone base station using a frequency of a UHF band is blocked by these walls. Further, for the purpose of avoiding obstacles to the portable telephone using a frequency adjacent to this frequency band without affecting intrusion into this section of an electromagnetic wave in a frequency band other than that of 952-955 MHz, a window is opened to a wall surface and covered with a frequency filter plate.;COPYRIGHT: (C)2014,JPO&INPIT
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