| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact antenna device resonating at a plurality of frequencies.SOLUTION: An antenna element Ant of the antenna device includes, on a dielectric, one end P1, another end P2 and an extension section ext extending between the one end P1 and the other end P2. The one end P1 is coupled with a power supply section OC and the extension section ext is formed in a loop. The other end P2 is coupled with the extension section ext, and a capacitor Ci is provided in the middle of the loop. The antenna element operates at a frequency resonating with the length of the extension section ext and a resonant frequency determined by the loop inductor and the capacitor Ci. |
