研究目的
To propose and analyze a novel polarization insensitive metamaterial absorber using a sunflower shaped unit cell for X-band applications, with enhancements through a hollow design to achieve perfect absorption.
研究成果
The proposed sunflower-shaped metamaterial absorber achieves high absorptivity (about 90%) at 11.9 GHz for both TE and TM polarizations. Introducing a hollow center enhances interaction with EM waves, resulting in perfect absorption at 11.7 GHz with improved bandwidth. This demonstrates the potential of symmetric geometries and hollow mechanisms for developing efficient, low-cost metamaterial absorbers in X-band applications, with FR-4 substrates being suitable due to their properties.
研究不足
The study is based on simulations and may not account for real-world fabrication imperfections or environmental factors. The bandwidth is narrow (0.02-0.05 GHz), and the design is specific to X-band frequencies, limiting broader applicability.
1：Experimental Design and Method Selection:
The study involved designing a metamaterial absorber with a sunflower-shaped unit cell and a modified version with a hollow center. Simulations were conducted using a 3D full-wave electromagnetic solver (CST) with frequency domain solver and periodic boundary conditions to analyze absorptivity under normal incidence for TE and TM polarizations.
2：Sample Selection and Data Sources:
The unit cells were designed with specific geometric parameters (e.g., radius, length of leaf sectors) and materials (FR-4 substrate, copper conductors).
3：List of Experimental Equipment and Materials:
CST software for simulations, FR-4 dielectric substrate (thickness
4：6 mm, relative dielectric constant 3, loss tangent 02), copper for conductors (thickness 035 mm). Experimental Procedures and Operational Workflow:
The unit cell was modeled in CST, simulations were run to compute reflection and absorption coefficients, and field distributions were analyzed.
5：Data Analysis Methods:
Absorption spectra, electric field distributions, and surface impedance were calculated and compared to evaluate performance.
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