Loop coil antenna

摘要: PROBLEM TO BE SOLVED: To construct an antenna matching circuit to avoid a bad influence when conductor such as metal or tag approaches reader / writer, thereby dissolving communication defect area on the writer side and stably maintaining distance. SOLUTION: In RF ID system in which, corresponds generating of magnetic field generated coil 15 11, radio wave for sending information is outputted by operating control electric power this corresponding tag, arranged near eddy current intentionally flowed. Thus, between approaching reduced. COPYRIGHT: (C)2005,JPO&NCIPI