| 摘要 |
PROBLEM TO BE SOLVED: To provide a planar loop antenna which can be configured in a small size and at low cost and is operated in a plurality of frequency bands as an antenna of an apparatus related to RFID for instance.SOLUTION: The planar loop antenna includes: a dielectric substrate; a first loop conductor 14 which is formed on one surface of the dielectric substrate and has a gap at a part; a second loop conductor 24 which is formed on the other surface of the dielectric substrate, has a gap at a part and is conducted with the first loop conductor; a reflector 20 which is arranged a predetermined distance away from the dielectric substrate and performs unbalanced feeding at a first frequency with the first loop conductor; and a coil-like conductor 34 which is arranged between the first loop conductor and the second loop conductor within the dielectric substrate, is operated in the frequency band different from the first frequency and performs transmission by an electromagnetic induction system. |
