Investigation of a Metamaterial Absorber with a Ground Plane by Impedance Analysis

• Published in: Journal of electronic materials Vol. 50; no. 1; pp. 389 - 396
• Main Authors: Yudistira, Hadi Teguh, Kananda, Kiki
• Format: Journal Article
• Language: English
• Published: New York Springer US 2021; Springer Nature B.V
• Subjects: Absorbance; Absorbers; Absorbers (materials); Characterization and Evaluation of Materials; Chemistry and Materials Science; Electromagnetic radiation; Electronics and Microelectronics; Ground plane; Impedance matching; Instrumentation; Interference; Investigations; Materials Science; Metamaterials; Optical and Electronic Materials; Refractivity; Solid State Physics; Stealth technology; impedance; Absorbance; metamaterial absorber; cross-shaped; electromagnetic
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-020-08554-4

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 z r real - 1 + i z r imaginary is calculated to describe the matching air impedance criteria, where z r (real) and z r (imaginary) are the real and imaginary values of relative impedance, respectively. The absorbance is below 0.1 in the z r real - 1 + i z r imaginary > 2 range. The gradient of the graph in the z r real - 1 + i z r imaginary > 2 range is close to zero; thus, the absorbance performance gradually changes. A significant change in absorbance is found in the 0 ≤ z r real - 1 + i z r imaginary ≤ 2 range. The gradient of the graph in the 0 ≤ z real - 1 + i z imaginary ≤ 2 range is around 0.45. Overall, the z r real - 1 + i z r imaginary result successfully clarified the absorbance performance for the cross-shaped metamaterial absorber with a ground plane.