DUAL CIRCULAR POLARIZED STEERING ANTENNA FOR SATELLITE COMMUNICATIONS IN X BAND By G. Exposito-Dominguez, J.-M. Fernandez Gonzalez, P. Padilla de la Torre, and M. Sierra-Castaner

In this work, a dual circular polarized steering antenna for satellite communications in X band is presented. The antenna consists of printed elements grouped in an array. This terminal works in a frequency band from 7.25 GHz up to 8.4 GHz (15% of bandwidth), where both bands, reception (RX) and transmission (TX) are included simultaneously and Left Handed Circular Polarization (LHCP) and Right Handed Circular Polarization (RHCP) are interchangeable. The antenna is compact, narrow bandwidth and reaches a gain of 16 dBi. It has the capability to steer in elevation to 45°, 75°, 105° and 135° electronically with a butler matrix and 360° in azimuth with a motorized junction.