| 摘要 |
A phased array antenna for providing a radiation pattern comprising at least one communication beam, the antenna comprising a plurality of antenna elements, each antenna element having an antenna element signal having a phase relationship and an amplitude relationship to the other element signals; a digital signal processing arrangement providing a digital beamforming network; and an analogue beamforming network arranged to reduce exposure of the digital signal processing arrangement to an interfering signal, the analogue beamforming network being configured to apply analogue beamforming weights selected to generate a null in the radiation pattern in a direction corresponding to the interfering signal to signals received from said antenna elements and the digital beamforming network being configured to apply digital beamforming weights for each of said at least one communication beams to signals received from said analogue beamforming network such that the composite radiation pattern of the antenna provides said at least one communication beams. The elements may be partitioned into subarrays, the analogue beamforming network applying beamforming weights to each antenna element within a subarray and the digital beamforming network applying beamforming weights to each subarray. |
