| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication equipment for radio card capable of obtaining magnetic field strength characteristics high in near magnetic field strength and weak in far electromagnetic field strength. SOLUTION: A closed loop conductor 1 at least surrounds the center of an antenna coil 2 and is electrically grounded. As a result, by the closed loop conductor 1 at least surrounding the center of the antenna coil 2 and electrically grounded, the distribution of magnetic field density is changed and the magnetic field strength characteristics high in the near magnetic field strength and weak in the far electromagnetic field strength are obtained. That is, influence on other equipment is suppressed. In the meantime, data and electric power are transferred even when the radio card 5 and this communication equipment 6 are in a longer distance and the convenience of a system utilizing the radio card 5 an the communication equipment 6 is improved. |
