READER OR/AND WRITER SYSTEM AND COMMUNICATION SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To prevent interference between plural adjacent readers or/and writers and the malfunction of plural adjacent non-contact type IC cards in a non- contact type IC card system. SOLUTION: Reader or/and writer antennas 101a and 101b are driven so that their phases can have a relatively inverted relation between reader or/and writer devices which adjacently arrange radiated electromagnetic fields of the antennas 101a and 101b which are provided in plural reader or/and writer devices 1a and 1b which are adjacently arranged.