Extending the Scanning Angle of a Phased‐Array Antenna Using a Thin Radome of Curved Metasurface

Abstract

A curved metasurface radome is designed to extend the scanning angle of a phased‐array antenna. Unlike the previous method, using negative index materials or transformation media (inhomogeneous and anisotropic), herein, only ordinary natural materials, i.e., a single‐layer well‐arranged ceramic block, are used, to realize the functions of the angle extending effect. The designed radome has a smaller size, lighter weight, a large angle extending effect, and is easy for fabrication. Therefore, the proposed method is more likely to be used in practical applications. The performance of the radome is verified by both numerical simulations and experimental demonstrations.

Simultaneously focusing electromagnetic and acoustic waves by double-physical-fields null medium

“…Our design principle is different from the current method on designing metasurfaces, which often needs to numerically calculate the phase shift and transmittance of each metasurface, and then adjust the geometric parameters of each unit to make its transmittance phase satisfy a specific distribution (on the premise of ensuring that the transmittance of each unit is close to 1) to achieve the focusing or other desired effect (Liu et al, 2020;Cai et al, 2021). In our design method, metal channels are used to mimic null medium for both electromagnetic wave and acoustic wave, which perform as the reduced null medium (Sun et al, 2020;Chen et al, 2023).…”

“…The proposed lens is a bulk lens, which has the curved output surface. To achieve a flat lens, metasurface may be a good choice (Liu et al, 2020;Cai et al, 2021). However, the current metasurface can only work for single-physical-field (i.e., electromagnetic wave or acoustic wave).…”