Investigation of a Metamaterial Absorber with a Ground Plane by Impedance Analysis
- PDF / 2,354,168 Bytes
- 8 Pages / 593.972 x 792 pts Page_size
- 38 Downloads / 176 Views
https://doi.org/10.1007/s11664-020-08554-4 Ó 2020 The Minerals, Metals & Materials Society
Investigation of a Metamaterial Absorber with a Ground Plane by Impedance Analysis HADI TEGUH YUDISTIRA
1,3,4
and KIKI KANANDA2,3
1.—Mechanical Engineering Study Program, Institut Teknologi Sumatera (ITERA), South Lampung, Lampung, Indonesia. 2.—Electrical Engineering Study Program, Institut Teknologi Sumatera (ITERA), South Lampung, Lampung, Indonesia. 3.—Research and Innovation Center for Conservation and Renewable Energy, Institut Teknologi Sumatera (ITERA), South Lampung, Lampung, Indonesia. 4.—e-mail: [email protected]
A metamaterial absorber is a fascinating candidate for stealth technology because it can prevent the propagation of reflected electromagnetic waves. Many metamaterial absorbers use a ground plane to yield high absorbance. Two theories are applied to investigate metamaterial absorbers: the matching air impedance and the high imaginary part of the refractive index simultaneously, or destructive interference theory. Destructive interference theory is often used to investigate metamaterial absorbers with a ground plane. In this work, a metamaterial perfect absorber with a ground plane is investigated using impedance analysis. High absorbance is generated while the matching air impedance condition is fulfilled for the metamaterial absorber with a ground plane. The jðzr ðrealÞ 1Þ þ izr ðimaginaryÞj is calculated to describe the matching air impedance criteria, where zr (real) and zr (imaginary) are the real and imaginary values of relative impedance, respectively. The absorbance is below 0.1 in the jðzr ðrealÞ 1Þ þ izr ðimaginaryÞj > 2 range. The gradient of the graph in the jðzr ðrealÞ 1Þ þ izr ðimaginaryÞj > 2 range is close to zero; thus, the absorbance performance gradually changes. A significant change in absorbance is found in the 0 jðzr ðrealÞ 1Þ þ izr ðimaginaryÞj 2 range. The gradient of the graph in the 0 jðzðrealÞ 1Þ þ izðimaginaryÞj 2 range is around 0.45. Overall, the jðzr ðrealÞ 1Þ þ izr ðimaginaryÞj result successfully clarified the absorbance performance for the cross-shaped metamaterial absorber with a ground plane. Key words: Absorbance, cross-shaped, electromagnetic, impedance, metamaterial absorber
INTRODUCTION Metamaterials have been the subject of many studies due to their unique properties. The permittivity and permeability of metamaterials can be adjusted by arranging the unit cell design; therefore, electromagnetic wave propagation can be controlled.1 The metamaterial spectrum performance can be determined by controlling the unit cell size of the metamaterial, which should be much
(Received August 27, 2020; accepted October 8, 2020)
smaller than the electromagnetic wavelength.1 Metamaterials can yield a negative refractive index,2,3 high refractive index,4,5 invisible cloak,6,7 and high absorbance.8,9 Metamaterial absorbers may be an alternative candidate for stealth technology.10 The principle concept for stealth technology is the prevention of reflect
Data Loading...
