| 摘要 |
The antenna assembly comprises a rod antenna and a helical antenna (3) connected to a transceiver. The helical antenna has an active state for receiving and transmitting the electromagnetic energy, and a passive state. The helical antenna is transferable from the active to the passive state by axial compression. The rod antenna is transferable by displacement between an active position, for receiving and emitting electromagnetic energy, and a passive position and vice versa. The rod antenna and the helical antenna mutually co-operate (16 and 17) so that when the helical antenna is transferred to the passive state the rod antenna transfers to the active state. |
