Design of high-gain, wideband antenna using microwave hyperbolic metasurface

Yan Zhao

doi:10.1063/1.4952752

Abstract

In this work, we apply hyperbolic metasurfaces (HMSs) to design high-gain and wideband antennas. It is shown that HMSs formed by a single layer of split-ring resonators (SRRs) can be excited to generate highly directive beams. In particular, we suggest two types of the SRR-HMS: a capacitively loaded SRR (CLSRR)-HMS and a substrate-backed double SRR (DSRR)-HMS. Both configurations ensure that the periodicity of the structures is sufficiently small for satisfying the effective medium theory. For the antenna design, we propose a two-layer-stacked configuration for the 2.4 GHz frequency band based on the DSRR-HMS excited by a folded monopole. Measurement results confirm numerical simulations and demonstrate that an antenna gain of more than 5 dBi can be obtained for the frequency range of 2.1 - 2.6 GHz, with a maximum gain of 7.8 dBi at 2.4 GHz.

Highlights

The first investigation of materials with simultaneously negative permittivity and permeability dates back to 1968.1 due to the difficulty in their practical realization, such materials did not gain much attention until in 2000, Sir John Pendry proposed a concept of ‘perfect lens’,2 which has an unlimited subwavelength resolution
We propose a two-layer-stacked configuration for the 2.4 GHz frequency band based on the double SRR (DSRR)-hyperbolic metasurfaces (HMSs) excited by a folded monopole
It is shown that highly directive beams can be generated from HMSs and such effects are more pronounced for thin HMSs

Summary

INTRODUCTION

The first investigation of materials with simultaneously negative permittivity and permeability dates back to 1968.1 due to the difficulty in their practical realization, such materials did not gain much attention until in 2000, Sir John Pendry proposed a concept of ‘perfect lens’,2 which has an unlimited subwavelength resolution. The analysis of such artificial periodic structures with extraordinary electromagnetic properties that cannot be found in nature, termed as metamaterials (MMs), have attracted tremendous research interests. Notable applications of MMs include superresolution imaging,[2,3] cloaking,[4] and perfect wave absorption[5] etc. A subcategory of MM, the so-called hyperbolic metamaterials (HMMs) whose isofrequency surface is a hyperboloid, have gained considerable attention as they support waves with unbounded wavevectors. Hyperbolic metasurfaces (HMSs), similar to their bulk counterpart, have been shown to possess exceptional abilities to control the flow of light, achieve anomalously large photonic density of states, and superresolution imaging.[6]. Optical wavelengths; at microwave frequencies, such low-profile structures may find more attractive applications such as the construction of compact antennas, microwave absorbers and thin cloaks etc

TRANSMISSION THROUGH HMS

DESIGN OF MICROWAVE HMS USING SRR

DESIGN OF HIGH-GAIN AND WIDEBAND ANTENNA USING DSRR-HMS

CONCLUSION