JACKET TYPE DEVICE AND PORTABLE COMMUNICATION TERMINAL WITH JACKET TYPE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a device type jacket communicable easily with an RFID having a coil antenna of small coil diameter by magnetic field coupling, and having an auxiliary antenna that is coupled with the reader/writer side coil antenna of a portable communication terminal by magnetic field.SOLUTION: In a jacket type device including an auxiliary antenna for coupling a reader/writer side coil antenna mounted on a portable communication terminal, and the coil antenna of an RFID tag, provided in an article, and having a coil diameter smaller than that of the reader/writer side coil antenna, by magnetic field, the auxiliary antenna has a large diameter coil for magnetic field coupling with the reader/writer side coil antenna, and a small diameter coil interconnected with the large diameter coil antenna, having a coil diameter smaller than that of the large diameter coil, and coupled with the coil antenna of the RFID tag by magnetic field.SELECTED DRAWING: Figure 1