Wide-Angle Beam Steering Based on an Active Conformal Metasurface Lens

Huan Li,Jiangtao Huangfu,Dexin Ye,Chao Ma,Tayeb A Denidni,Lixin Ran,Changzhi Li,Kuiwen Xu,Fazhong Shen

doi:10.1109/access.2019.2960639

Abstract

This work experimentally demonstrates a wide-angle beam steering based on an active conformal metasurface lens. Integrated with microwave varactors, the transmission phase of this cylindrical metasurface lens can be tuned in a range up to 195° by direct-current (DC) bias voltages. By compensating the phase difference between different incidences, the proposed cylindrical lens can collimate the incident spherical wave front into a plane wave front with predefined deflection angle. By increasing the number of feeding sources, the beam steering range of conformal lens can be expanded to ±60°. Having advantages of low cost and simple structure, the proposed conformal lens can be extended to millimeter-wave band and enable a wide range of applications.

Highlights

Having the ability of flexible control of beam direction, phased array antennas have been used in a wide range of applications such as satellite communications and radars
Examples include antenna systems based on tunable impedance surfaces [4]–[6], ferroelectric ceramic [7], photo-sensitive semiconductors [8], [9], tunable metamaterials [10]–[16], coding metasurfaces [17]–[19], and frequency selective surfaces (FSSs) [20]–[22], and reconfigurable Fresnel zone plate (FZP) at single and dual bands [23], [24]
With the feeding antenna 2, Fig. 10(b) shows the measured radiation patterns with main beams steered to the negative direction. These results demonstrate that the beam steering range can be readily expanded by increasing the number of feeding sources

Summary

Introduction

Having the ability of flexible control of beam direction, phased array antennas have been used in a wide range of applications such as satellite communications and radars. Examples include antenna systems based on tunable impedance surfaces [4]–[6], ferroelectric ceramic [7], photo-sensitive semiconductors [8], [9], tunable metamaterials [10]–[16], coding metasurfaces [17]–[19], and frequency selective surfaces (FSSs) [20]–[22], and reconfigurable Fresnel zone plate (FZP) at single and dual bands [23], [24]. The phase-correction technique, either partial phase or full phase, has been demonstrated as an effective method to suppress the

Methods

Conclusion