Compact Left-Handed Meta-Atom for S-, C- and Ku-Band Application

Md Hasan,Mohammad Faruque,Mohammad Islam

doi:10.3390/app7101071

Md Hasan, Mohammad Faruque + Show 1 more

Open Access

https://doi.org/10.3390/app7101071

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Abstract

A new compact left-handed meta-atom for S-, C- and Ku-band applications is presented in this paper. The proposed structure provides a wide bandwidth and exhibits left-handed characteristics at 0°, 90°, 180° and 270° (xy-axes) rotations. Besides, the left-handed characteristics and wide bandwidth of 1 × 2, 2 × 2, 3 × 3 and 4 × 4 arrays are also investigated at the above-mentioned rotation angles. In this study, the meta-atom is designed by creating splits at the outer and inner square-shaped ring resonators, and a metal arm is placed at the middle of the inner ring resonator. The arm is also connected to the upper and lower portions of the inner ring resonator, and later, the design appears as an I-shaped split ring resonator. The commercially available, finite integration technique (FIT)-based electromagnetic simulator CST Microwave Studio is used for design and simulation purposes. The measured data comply well with the simulated data of the unit cell for 1 × 2, 2 × 2, 3 × 3 and 4 × 4 arrays at every rotation angle. Owing to the effective medium ratio (EMR) of 8.50 at 0° and 180° rotations, the proposed meta-atom structure is compact in size. Moreover, due to the quality factor of 82, the designed meta-atom is flexible for high-performance antenna, filter and sensor applications. Therefore, the meta-atom integrated antenna shows multi frequency bands with the highest peak gain of 5 dBi, which is used as the long distance radio communication frequency.

Highlights

Electromagnetic meta-atoms are composed of artificial atoms, whose electric and magnetic response could be flexibly tailored to meet desired exotic EM properties
Of 8.50 at 0◦ and 180◦ rotations, the proposed meta-atom structure is compact in size
Due to the quality factor of 82, the designed meta-atom is flexible for high-performance antenna, filter and sensor applications

Summary

Introduction

Electromagnetic meta-atoms are composed of artificial atoms, whose electric and magnetic response could be flexibly tailored to meet desired exotic EM properties. Benefiting from these novel properties, meta-atoms have produced many exotic effects in several applications, such as negative permeability, sub-wavelength imaging super-lens, electromagnetic absorbers [1], negative refraction [2], filter design [3], antenna performance enhancing, SAR reduction [4] and invisible cloaking [5]. Material that exhibits either negative permittivity or negative permeability is called a single-negative meta-atom. A material exhibiting negative permeability and negative permittivity simultaneously can be characterized as a double-negative or left-handed meta-atom. Various composites based on metallic and dielectric structures that act as left-handed meta-atoms have been developed (Figure 1) [6,7,8,9,10,11,12]

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