Design of a Transmitarray Antenna Using 4 Layers of Double Square Ring Elements

A Low-Profile Cylindrical Conformal Transmitarray Antenna

“…Compared with reflectarray, these requirements greatly increase the design difficulty of a transmitarray element. According to working principles, the design of a transmitarray element can be divided into three categories: multilayer frequency selective surfaces (M-FSS) [6,7], receive/transmit elements [8], and metamaterial transformation approach [1,9].…”

Broadband, large-numerical-aperture and high-efficiency microwave metalens by using a double-layer transmissive metasurface

“…Meanwhile, metalenses in the lower microwave band have also been demonstrated and studied by using different materials and architecture compared to the aforementioned ones. [20][21][22][23][24][25][26][27][28][29] In order to realize high transmission and huge phase shift, multi-layer metallic metasurfaces sandwiched by filled dielectric are usually employed to design a metalens and have also been largely presented in the field of transmitarray antennas. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] So far, a five-layer microwave metalens with high efficiency of about 80% but a small NA = 0.5 is designed.…”

“…[20][21][22][23][24][25][26][27][28][29] In order to realize high transmission and huge phase shift, multi-layer metallic metasurfaces sandwiched by filled dielectric are usually employed to design a metalens and have also been largely presented in the field of transmitarray antennas. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] So far, a five-layer microwave metalens with high efficiency of about 80% but a small NA = 0.5 is designed. 9) Also, high NA above 0.9 microwave metalenses with a peak focusing efficiency of around 50% is demonstrated by using a four-layer transmissive metasurface.…”