an antenna suited for a communications satellite includes two separately located , mutually orthogonally polarized feed antennas such as vertically and horizontally polarized linear horns . the horns feed an active reflector antenna array . the array includes a plurality of mutually orthogonally polarized antenna elements such as crossed dipoles or square patch antenna with cross feeds for two independent orthogonal polarizations . the feeds of the antenna elements are coupled to amplifier modules . each module includes a circulator for each polarization , coupled to a processor including a low noise amplifier , controlled phase shifter , variable gain amplifier and power amplifier . the output of the power amplifier feeds the antenna element through the circulator . the large number of radiating elements allows high power using power amplifier with relatively modest capabilities . the phase shifters of each module independently control the reradiation phase of the vertical and horizontal signals , so that a collimated beam can be independently focused to the two feed points , one for each polarization .