| 摘要 |
<p>A method of communicating between a multi-beam phased array antenna (30) and a plurality of mobile communication devices (35, 37) located at different distances from the antenna. The antenna comprises a plurality of antenna elements (39) mounted at different heights. The method comprises communicating between the antenna and the further of the mobile communication devices using an upper beam (50); and communicating between the antenna and the closer of the mobile communication devices using a lower beam (51) which is downtilted with respect to the upper beam. A method of communicating between a multi-beam phased array antenna (30) and a plurality of mobile communication devices. The method comprises generating a first carrier signal having a first frequency f1; modulating the first carrier signal to generate first down-link signals; transmitting the first down-link signals from the antenna to the mobile communication devices in a first beam; generating a second carrier signal having a second frequency f2 which is different to the first frequency; modulating the second carrier signal to generate second down-link signals; and transmitting the second down-link signals from the antenna to the mobile communication devices in a second beam which is directed at a different angle to the first beam.</p> |
