A Low‐Profile Dual‐Circularly Polarized Decoupled Folded Transmitarray Antenna

ABSTRACT

In this letter, a dual‐circularly polarized (dual‐CP) decoupled folded transmitarray antenna (FTA) is proposed, consisting of a transmissive metasurface (TMS), a reflective metasurface (RMS), and two magnetoelectric‐dipoles for LHCP and RHCP excitation. The unit cells in the TMS and RMS are capable of achieving dual‐CP decoupling. A low profile () is realized by incorporating the principle of anomalous reflection. The proposed FTA has been experimentally validated, and the measured results agree well with the simulations. The LHCP and RHCP beams are directed toward () and (), achieving peak aperture efficiencies (AEs) of 27.7%/28.3%. The 3‐dB gain and axial ratio bandwidths (BWs) for LHCP/RHCP beams are 24.8%/23.8% and 29.3%/27.9%, respectively. This work integrates dual‐CP decoupling into an FTA, featuring high AEs, wide BWs and a low profile, enabling independent beam pointing for dual‐CP satellite communication scenarios.