| 摘要 |
A multi-resonant antenna device having good VSWR characteristics even in the UWB band, and a wireless communication apparatus including the antenna device are provided. The antenna device includes a substrate, an antenna main body surface-mounted at a corner of the substrate, and slits. The antenna device resonates at two different resonance frequencies. The slits are arranged to bring a VSWR value at a frequency between the two resonance frequencies closer to VSWR values at the two resonance frequencies. The slits include capacitive adjustment slit portions and inductive adjustment slit portions. The slits are provided in an area where the density of a current flowing on ground conductor surfaces is highest. The slits are arranged perpendicularly or substantially perpendicularly to a direction of this current. Specifically, the slits are provided near and parallel or substantially parallel to an open end of the radiating electrode portion. The lengths of the slits are set to one-eighth of a wavelength at a frequency corresponding to the highest VSWR value in the range between the two resonance frequencies. |
