| 摘要 |
In order to suppress a noise component such as a harmonic component of the fundamental component of an electromagnetic wave produced by an electric current flowing through a main coil that functions as an antenna while minimizing the attenuation of the fundamental component, this antenna coil unit includes a main coil (41) and an auxiliary coil (42) electrically insulated from the main coil (41), the auxiliary coil (42) being arranged at a position in which an induction current is produced by a magnetic field produced by an electric current flowing through the main coil (41). The auxiliary coil (42) is configured in a state in which a frequency deviating by a predefined amount in a predefined direction from a target frequency predefined within a harmonic component of the fundamental component of an electromagnetic wave produced by the electric current flowing through the main coil (41) is taken as a resonance frequency. The direction and amount are such that the phase of an alternating-current (AC) current flowing through the auxiliary coil (42) is in an opposite-phase state, which is opposite the phase of the harmonic component of an AC current flowing through the main coil (41). |
