Antenna device and communication device using antenna device

摘要

An antenna device ( 60 ) is provided that is used in a recorder and/or writer destined for writing and reading data to and from a contactless IC card ( 1 ). The antenna device ( 60 ) includes a loop coil ( 61 ) that radiates a magnetic field, magnetically couples with a loop coil ( 4 ) provided in the IC card ( 1 ), and sends and receives data to and from the IC card ( 1 ). The loop coil ( 61 ) is formed asymmetric for the winding sections thereof opposite to each other across the center of the loop coil ( 61 ) to be different in interval from each other.