Transmitarray Antenna Design Using Cross-Slot Elements With No Dielectric Substrate

By Ahmed Hussein Ahmed AbdelRahman, Atef Z. Elsherbeni, Fan Yang. IEEE Antennas and Wireless Propagation Letters, 2014

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Using Reconfigurable Transmitarray to Achieve Beam-Steering and Polarization Manipulation Applications (2015, background): “Since, one layer FSS cannot cover a full 360◦ of phase shift, multiple-layer FSS structures separated by an air gap or dielectric material are often needed to increase phase tuning range [24], [25].”
Design and Experiment of a Near-Zero-Thickness High-Gain Transmit-Reflect-Array Antenna Using Anisotropic Metasurface (2018, background): “Therefore, a simple question arises naturally: is it possible to integrate the RA and TA capabilities together to generate forward and backward pencil beams simultaneously using a single aperture? Enlightened by the latest developments in metasurfaces [16]–[19] and the concept of metal-only TAs [20]”
X-Band Phase-Gradient Metasurface for High-Gain Lens Antenna Application (2015, background): “Reflectarray [26] and transmitarray [27] antennas also attract a great attention for their trait of flat and thin.”
Single-Layer Focusing Gradient Metasurface for Ultrathin Planar Lens Antenna Application (2017, background): “In the research areas of the flat lens antennas, phase-shifting surface (PSS) also named transmitarray (TA) is the most attractive one [23]–[27].”