Beam-steering ka-band phase rotation cells-based transmit-array for circular-polarization

Abstract

Planar transmit-arrays (TAs) have been an attractive solution as gain-enhancers for various applications, e.g. satellite communications. For the first time, a TA composed of sequentially rotated cells is employed as beam-steering circular polarization Ka-band satellite ground terminal. Moreover, it is shown that the intrinsic filtering effect of phase rotation (PR) cells for this kind of TA enables improvement in the axial ratio bandwidth. The performance of the TA is evaluated through simulation. The TA presents only 2.7dB loss over zenith scan between 15° and 50° while its structure rotation provides 360° azimuth scan. The TA offers 2GHz (28.730.7GHz) combined 3dB axial ratio and 3dB gain bandwidth.