To address the long distance and significant loss in satellite-to-ground wireless link,new demands are im-posed on satellite phased arrays by direct-to-handset satellite. By analyzing the practical requirements of direct-to-handset satellite,the advantages and disadvantages of various beamforming architectures were outlined,then the proper selection strategy of beamforming architecture was proposed. Subsequently,dual-band shared-aperture circularly-polarized antenna arrays under frequency division duplexing (FDD) were discussed. In addition,the stack-ing and integration architecture of phased arrays was reviewed,and several key fabrication technologies for compo-nents and chips were introduced. Finally,the outlook and key technologies of satellite phased arrays for direct-to-handset satellite were presented.
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