| 摘要 |
A control device (300) that specifies an output level to a reader/writer configured to supply an electrical signal corresponding to a radio signal to a stripline cell for transmitting the radio signal to an RFID tag and that has unique output characteristics. The control device (300) includes a response analyzing section (310) that checks the existence of a reaction in the RFID tag; and a distance calculation processing section (312) that uses the output characteristics of the reader/writer from the output level specified to the reader/writer to obtain an electric field strength of the radio signal received by the RFID tag and that converts the electric field strength to a distance between a predetermined antenna and the RFID tag, the antenna transmitting the radio signal with a predetermined output and the RFID tag receiving the radio signal at a same electric field strength as the electric field strength. |
