Tetrahedral Molecular Shaped Metamaterial Absorber for Ku and K Band Applications

In this article, a metamaterial absorber with a tetrahedral molecular-shaped structure is proposed for Ku and K band applications. The preferred measurement for the metamaterial absorber is $\mathbf{9. 6}$ by $\mathbf{9. 6}$ millimeters. Designing the structure and analyzing its reflection coefficient are done using Computer Simulation Technology (CST) Microwave Studios. Different parametric studies have been conducted to enhance the structure’s design and size. Through simulation, satisfactory absorption levels were achieved at desired resonance frequencies. Additionally, a single negative value was observed, confirming the presence of metamaterial characteristics. The unit cell of the metamaterial absorber was created utilizing FR4, a readily available and cost-effective substrate material characterized by a dielectric constant of 4.3. The metamaterial absorber has an absorbance of $\mathbf{9 9. 4 3 \%}$ at $\mathbf{1 2. 7 6 9} \mathbf{~ G H z}, \mathbf{9 9. 5 9 \%}$ at $13.415 \mathrm{GHz}, 97.23 \%$ at $17.139 \mathrm{GHz}, \mathbf{9 5. 9 9 \%}$ at 22.687 GHz, and 97.92% at $\mathbf{2 6. 2 2 1 ~ G H z}$. Because of the uncomplicated design of the suggested absorber, the manufacturing process can be straightforward. Consequently, this absorber can be applied effectively in tasks like sensing, detection, and imaging.