| 摘要 |
The antenna device includes a feed portion coupled to circuitry of a radio. A helical conductive element has two ends and a defined pitch and diameter. A second element has third and fourth ends. The second and fourth ends are free ends. The first and third ends are intercoupled at a feed portion. The two elements are arranged coaxially. The second element has a different pitch and diameter to the first element. The first element performs the transmission and reception within a given band. The second element operates in a second band, which is separate from the first. |
