| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device enabling a user to select a value of a resonance frequency by relatively easily changing it and suitable for a small and thin wireless device. <P>SOLUTION: The antenna device 1 is provided with a first antenna element 10 and a second antenna element 20 branched from the first antenna element 10. A power-feeding end 11 and a grounding end 12 of the first antenna element 10 are arranged close to each other. The first antenna element 10 has a first-part line 15 extended from the power-feeding end 11 to a first folded-back part 13, a second-part line 16 extended from the first folded-back part 13 to a second folded-back part 14, and a third-part line 17 extended from the second folded-back part 14 to the grounding end 12. The first-part line 15 is arranged close and nearly in parallel to the second-part line 16. The third-part line 17 is arranged close and in parallel to the second-part line 16. The second antenna element 20 is branched from the second-part line 16 at a branching part 18 apart at a distance of a line length of nearly half of the second-part line 16 from the first folded-back part 13. <P>COPYRIGHT: (C)2007,JPO&INPIT |
