研究目的
Investigating the design and performance of a wide band polarization and incident angle independent metamaterial absorber (MA) for C-band and X-band applications, including its energy harvesting capabilities.
研究成果
The proposed fractal-based metamaterial absorber demonstrates wideband absorption characteristics (5.16-10.88 GHz) with peak absorption of 95.72% at 6.57 GHz. It shows polarization and incident angle independence, making it suitable for C-band and X-band applications. The study also highlights the potential for energy harvesting, with at least 56% of incident wave power converted to active power within the 4-12 GHz frequency range.
研究不足
The study is limited by the fabrication and calibration errors, which cause small differences between simulated and measured results. Additionally, the energy harvesting efficiency is only numerically examined due to laboratory facility limitations.
1：Experimental Design and Method Selection:
The study employs a fractal circle loop-based unit-cell design with four lumped resistors to achieve broad band absorption characteristics. The structure is simulated using CST Microwave Studio, a finite element method-based EM solver.
2：Sample Selection and Data Sources:
The proposed MA structure is fabricated using FR-4 material with copper as the resonator and ground metal. The dimensions and material properties are specified for reproducibility.
3：List of Experimental Equipment and Materials:
The study uses a vector network analyzer (VNA) and two wideband, linearly polarized horn antennas for experimental validation. The fabrication is done using an LPKFE33 prototyping machine.
4：Experimental Procedures and Operational Workflow:
The absorption characteristics are measured under normal incidence, with variations in polarization and incident angles to test the MA's insensitivity. The effect of design parameters on absorption is analyzed through parametric studies.
5：Data Analysis Methods:
The absorption mechanism is explained through electric field and surface current distribution analyses. The equivalent circuit model is used to understand the resonant frequencies and absorption characteristics.
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