| 摘要 |
An antenna unit employing a minute loop antenna comprises a minute loop antenna (11) formed substantially perpendicular to the mounting surface of a circuit board (2), a ground pattern (6) formed on the mounting surface of the circuit board (2) and functioning as a dipole antenna, and a wireless circuit section (12) mounted on the circuit board. When a conductors is arranged closely, increase in resonance frequency of the minute loop antenna (11) due to the conductor is compensated by lowering the resonance frequency of the dipole antenna (6), thereby reducing impedance mismatch between the minute loop antenna (11) and the dipole antenna (6) and the wireless circuit section (12).
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