| 摘要 |
A dual frequency antenna, which is particularly suited to mobile communications, has a radiating/receiving conductor plate 2 and a ground plane 3, which are coupled through two coupling means 4 and 7, and a coaxial feed 5. The coupling of the conductor plate 2 with ground plane 3 by the first coupling means 4 defines a first antenna resonant frequency whilst the second coupling means provides a high impedance path between the conductor plate of a ground plane for this frequency. The coupling of the conductor plate with the ground plane 3 by the second coupling means 7 defines the second antenna resonant frequency whilst the first coupling means provides a high impedance path between the conductor plate and ground plane for this frequency. A further embodiment includes a controller (9, fig 4) which facilitates the use of the second coupling (8, fig 4), in order to switch the antenna between dual and single frequency modes. |
