| 摘要 |
An antenna element (30, 31, 32), comprising a wave-guide (1, 1') comprising a number of slots (2, 2', 3, 3') being pairwise arranged, preferably at 90 degrees to one another and +/- 45 degrees to the longitudinal direction of the waveguide has been described. The antenna element is coupled to a feeder (5) for providing a first wave inside the wave-guide (W_a). The antenna element comprises at least one amplitude and phase control unit (APC, 14, 15, 16) for controlling the phase and amplitude of a reflected or separately provided second wave (W_b) in relation to the first wave, the second wave propagating inside the wave-guide in an opposite direction to the first wave (W_a), whereby the polarisation of an emitted or received wave (W') outside the wave-guide can be controlled. Moreover, a transceiver (33, 34, 35) adapted for controlling the polarisation modes and a method for operating such a transceiver has been described. |
