Control and improvement of antenna gain by using multilayer non-uniform metasurfaces

Jiaqi Han,Long Li,Tianliang Zhang,Rui Xi

doi:10.1051/epjam/2019003

Abstract

In this paper, a new high-gain antenna with beam control based on multilayer non-uniform metasurfaces (MNMSs) is proposed. The MNMS consists of multilayer non-uniform square and ring metal patches array. The phase-shift of the MNMS element can achieve 310° with the variation of geometrical sizes. Moreover, four high-gain antennas based on MNMS element are designed, fabricated, and measured to realize 0°, 30°, 45°, and 60° beam control in pitching plane, respectively. Relative bandwidth of the proposed high-gain antenna is above 12%. The simulated and measured results of the proposed antennas show that the wide-angle and azimuth direction beam control capability can be effectively realized by integrating different MNMS with the feeding horn antenna.

Highlights

Metasurface (MS) is a two-dimensional metamaterial structure, which is typically engineered by arranging a set of electrically small scatterers into a two-dimensional pattern at a surface or interface
We propose a non-uniform MS to control and improve the gain of a feeding antenna
A new high-gain antenna based on multilayer non-uniform metasurfaces (MNMSs) is proposed

Summary

Introduction

Metasurface (MS) is a two-dimensional metamaterial structure, which is typically engineered by arranging a set of electrically small scatterers into a two-dimensional pattern at a surface or interface. On the basis of the traditional multilayer frequency selective surface (FSS), a design method of achieving wideband MS by utilizing multilayer non-resonant structure is proposed [1,2,3]. According to the theory of array antenna, the phase shifts of each unit of the MS need to be compensated to adjust and control the electromagnetic waves propagation direction. The theory of phase compensation [5,6,7] of the transmission array antenna is based on the compensation of the path transmission from the center of the feeding antenna [8,9,10]. We propose a non-uniform MS to control and improve the gain of a feeding antenna. According to the theory of array antenna, the main beam direction control and high gain antenna can be achieved by integrating multilayer non-uniform metasurfaces (MNMSs).

Antenna element

High-gain antenna design and analysis

Experimental results and analysis

Conclusion