| 摘要 |
It is an object of the present invention to provide a shared antenna capable of communicating radio waves with different frequencies or different polarization characteristics, having a simple configuration, and capable of being placed in a small device. An antenna 1 according to the invention includes a plurality of loops of the shape of a cross in a spiral fashion and includes a gap 5 provided at a certain midpoint in the spiral loops and a power supply portion 4 provided in a central portion. The distance of the gap 5 is set such that electromagnetic coupling is caused at a first frequency and no electromagnetic coupling is caused at a second frequency different from the first frequency.
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