| 摘要 |
A dual-band, dual-polarization LOS/SATCOM antenna is disclosed having a plurality of omni-directional elements 203 surrounding a directional element 204. When the antenna is in an omni-directional radiating mode (Fig. 2), the directional element is disconnected from the circuit and only the omni-directional elements radiate. The directional element has radiators 205 at one end. When the antenna is in a directional mode (Fig. 4), the omni-directional elements 203 fold out to be perpendicular to the transmission axis and serve as reflectors for the driving radiators 205, which also fold to be perpendicular to the transmission axis. The radiators 205 and elements 203 are adjustable in length to provide added gain. The omni-directional elements comprise vertical monopoles. The directional element comprises crossed orthogonal dipole elements arranged to have circular polarisation. |
