研究目的
To design a millimeter wave 1-bit coding engineered reflector for backscattered electromagnetic wave shaping by combining cross-polarization conversion and reflection phase cancellation principles.
研究成果
The proposed 1-bit engineered reflector based on cross-polarization conversion effectively shapes backscattered EM-waves at millimeter wave frequencies, achieving over 92.1% polarization conversion efficiency and more than 6dB RCS reduction. It demonstrates the ability to generate various scattering patterns, such as diffuse reflection, through optimized unit cell distributions. Future work could focus on improving fabrication accuracy and expanding measurement capabilities for RCS patterns.
研究不足
The measured results deviated from simulations due to fabrication errors and misalignment during measurements. RCS pattern measurements were not conducted due to limitations in measurement facilities at the W-band frequency. The design is validated primarily through reflection coefficient measurements rather than full RCS patterns.
1：Experimental Design and Method Selection:
The design involves an anisotropic unit cell with four inverted L-shape copper resonators on a PEC-backed dielectric substrate. Full-wave simulations using CST Microwave Studio with unit cell boundary conditions and Floquet ports were employed to analyze cross-polarization and co-polarization reflections. A MATLAB code based on formulas from literature was used for optimizing unit cell distribution in engineered reflectors.
2：Sample Selection and Data Sources:
The unit cell dimensions were optimized through numerical simulations. Engineered reflectors (e.g., Surface#1 to #4) with 8x8 unit cells (16x16 mm2 area) were designed with specific distributions of '0' and '1' elements.
3：List of Experimental Equipment and Materials:
Materials include copper for resonators, a PEC-backed dielectric substrate (εr=10.2, h=1.27mm), and an organic-ceramic woven glass substrate from Taconic for fabrication. Equipment includes CST Microwave Studio for simulations, a network analyzer, W-band horn antennas, electromagnetic wave absorbers, and an anechoic chamber for measurements.
4：2, h=27mm), and an organic-ceramic woven glass substrate from Taconic for fabrication. Equipment includes CST Microwave Studio for simulations, a network analyzer, W-band horn antennas, electromagnetic wave absorbers, and an anechoic chamber for measurements.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Simulations were conducted to extract reflection coefficients and phases. Fabrication was done using low-cost PCB technology. Measurements involved placing the fabricated surface in an anechoic chamber with horn antennas connected to a network analyzer to measure co-pol and cross-pol reflection coefficients.
5：Data Analysis Methods:
Data analysis included calculating polarization conversion ratio (PCR), reflection phase differences, and RCS patterns using formulas from literature. Results were compared between simulations and measurements.
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