| 摘要 |
An antenna for a telecommunications device, comprising at least three helical radiating elements substantially equally spaced about, and concentric to, a longitudinal axis of the antenna. The antenna has a different physical property along the radiating elements such that when an electrical signal is supplied to each radiating element, with the phase relationship between each electrical signal being 360 degrees divided by the number of radiating elements, the antenna resonates at at least two different frequencies. |
