| 摘要 |
The invention relates to an antenna device for a communication device operable in at least two frequency bands. The antenna device (1) comprises a generally planar driven radiating element (2) having a feeding portion (5) connectable to a feed device of the communication device (20) and a generally planar parasitic element (3, 3') having a grounding portion (G) connectable to a ground device of the communication device (20). The driven radiating element (2) and the parasitic element (3, 3', 3") are essentially coplanar and separated by a gap (7). In accordance with the invention the parasitic element (3, 3', 3") comprises a slit (6, 6'), by means of which a double-resonance is provided in a first frequency interval. The invention also relates to a parasitic element and to a communication device comprising such an antenna device. |
