| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna device having excellent transmission efficiency of RF radio signals with a high coupling degree between a power supply coil and an antenna coil, and to enable easy application of the antenna device to a communication terminal device.SOLUTION: An antenna device 301 includes a power supply coil 101 and an antenna coil 201. The power supply coil 101 includes a tabular magnetic substance core 13 and a power supply coil 12 wound around the periphery thereof. Both ends of the power supply coil 12 are connected to a power supply circuit including an RFIC. The antenna coil 201 includes an antenna coil conductor 22 formed on a flexible base material 21 and a magnetic substance core 25. A magnetic flux MF1 passes through the magnetic substance core 13 of the power supply coil 101 and the magnetic substance core 25 of the antenna coil 201, and circulates through a path passing through an inner edge portion of the antenna coil conductor 22, to interlink with an antenna of an opposite communication party. |
