Polarization insensitivity characterization of dual-band perfect metamaterial absorber for K band sensing applications

Mohammad Lutful Hakim,Ali F Almutairi,Mohammad Tariqul Islam,Touhidul Alam,Mohd Fais Mansor

doi:10.1038/s41598-021-97395-0

Abstract

Polarization insensitive metamaterial absorbers (MA) are currently very attractive due to their unique absorption properties at different polarization angles. As a result, this type of absorber is widely used in sensing, imaging, energy harvesting, etc. This paper presents the design and characterization of a dual-band polarization-insensitive metamaterial absorber (MA) for K-band applications. The metamaterial absorber consists of two modified split ring resonators with an inner cross conductor to achieve a 90% absorption bandwidth of 400 MHz (21.4–21.8 GHz) and 760 MHz (23.84–24.24 GHz) at transverse electromagnetic (TEM), transverse electric (TE), and transverse magnetic (TM) mode. Polarization insensitivity of different incident angles for TE and TM mode is also investigated, which reveals a similar absorption behavior up to 90°. The metamaterial structure generates single negative (SNG) property at a lower frequency of 21.6 GHz and double negative property (DNG) at an upper frequency of 24.04 GHz. The permittivity and pressure sensor application are investigated for the proposed absorber, which shows its useability in these applications. Finally, a comparison with recent works is also performed to demonstrate the feasibility of the proposed structure for K band application, like sensor, filter, invasive clock, etc.

Highlights

Polarization insensitive metamaterial absorbers (MA) are currently very attractive due to their unique absorption properties at different polarization angles
Many researchers are working on X and Ku band applications with three layer symmetrical structure with different patch designs like ring C shape 25, Jerusalem crosses with square ring resonator (SRR)[26], cross shape resonator (CSR), and complimentary cross shape resonator CCSR27
The metamaterial property and absorption behaviors for different (0°, 45°, and 90°) polarization angles, e-field, h-field, and surface current distributions, equivalent circuit model, and measurements are illustrated in 3.3–3.6

Summary

Introduction

Polarization insensitive metamaterial absorbers (MA) are currently very attractive due to their unique absorption properties at different polarization angles. Metamaterial is an artificial structure that consolidates startling characteristics like negative permeability and/ or permittivity, which leads to a negative or positive refractive index and backward propagation[1] This special phenomenon facilitates researchers to use metamaterial in various fields like absorption, sensing, antenna design, mobile applications, military purposes, reduction of radar cross-section, electromagnetic clock, filter, waveguide, lenses, e tc[2,3,4,5,6,7,8,9,10]. Polarization insensitivity is the essential feature of MPA because the position of absorption bandwidth and absorption level remains unchanged at different polarization angles This feature is achieved by a high degree of symmetrical structure d esign[16,17].

Methods

Results

Conclusion