A New Compact Quad-Band Metamaterial Absorber Using Interlaced I/Square Resonators: Design, Fabrication, and Characterization

Mohamed Edries,Mohamed A El-Morsy,Hala A Mansour,Sherif S Hekal,Hesham A Mohamed

doi:10.1109/access.2020.3009904

Abstract

This paper presents the design and analysis of a new compact quad-band metamaterial absorber (MMA). The proposed structure is constructed as an array of 12 × 13 unit cells, each one is based on a combination of interlaced I/square resonators supporting four distinct resonant frequencies. The proposed metamaterial unit cell is printed on FR-4 substrate with thickness 1.5 mm and size 20 mm × 20 mm. The MMA structure exhibits four distinct absorption peaks at 2.248, 2.878, 4.3 and 5.872 GHz with absorption rates of 96, 93, 93, and 95 %, respectively, under normal incidence. This design achieves a negative permittivity and permeability that is applicable for S-band and C-band operating frequencies. The MMA unit cell structure has a 3-dB bandwidth of 78, 89, 144 and 202.6 MHz. The proposed structure has compactness of 0.15 λ0× 0.15 λ0 with thickness of 0.0112 λο, where λ0 is the free-space wavelength with respect to the lowest resonance frequency (2.248 GHz). The input impedance, surface currents and electric field distributions are shown to illustrate the mechanism of the structure. The design has been fabricated showing a good agreement between simulated and measured results. The proposed absorber structure can be used in different applications such as electro-magnetic protections, as well as military and medical applications. All simulation results are performed using the Computer Simulation Technology (CST), Microwave Studio 2018 software and Mathwork simulation tool MATLAB ver. 2011.

Highlights

During the last decade, scientific research focused on the development of the properties of materials used to give special specifications according to their practical use
SIMULTION RESULTS AND DISCUSSION As explained before, the performance and the electromagnetic characteristics of the proposed quad-band metamaterial absorber shown as in Fig. 1a can be examined by the scattering parameters; the reflection coefficient S11 and the transmission coefficient S21
It can be observed that Structure-A has one absorption peak at 2.24 GHz with absorption peak of 98.3 %, Structure-B has one absorption peak at 2.8 GHz with absorptivity of 84 %, while Structure-C consists of two absorption bands at 4.2 and 5.7 GHz with peak absorptivity of 95.7 and 99.97 %, respectively

Summary

INTRODUCTION

Scientific research focused on the development of the properties of materials used to give special specifications according to their practical use. Design parameters of the proposed metamaterial absorber unit cell. UNIT CELL STRUCTURE DESIGN Fig. 1a shows the geometry of the proposed quad-band metamaterial absorber unit cell. A commercially available substrate lossy dielectric flame retardant (FR-4) material separated the structure of metamaterial absorber unit cell and the ground plane. It has a dielectric constant of 4.3 with 0.025 loss tangent and thickness of h = 1.5 mm. The effective parameters of the metamaterial absorber such as relative permittivity εr , relative permeability μr , relative impedance Zr , and relative refractive index nr can be calculated as follows: εr.

SIMULTION RESULTS AND DISCUSSION

EXPERIMENTAL RESULTS

CONCLUSION