研究目的
To design and investigate a complete polarization converter using dielectric periodic structures for applications in polar SAR observations, focusing on achieving complete TE/TM polarization conversion in millimeter waves.
研究成果
The dielectric periodic structure can achieve complete TE/TM polarization conversion under oblique incidence conditions, with a 90% relative conversion bandwidth of 12.7% for certain parameters. This provides a foundation for designing efficient millimeter-wave polarization converters, suggesting potential for broader applications with further optimization.
研究不足
The study is theoretical and numerical, lacking experimental validation; it focuses on specific dielectric materials and geometric parameters, which may limit generalizability; and it does not address practical implementation challenges such as fabrication tolerances or environmental factors.
1：Experimental Design and Method Selection:
The study employs a theoretical and numerical approach combining multimode network theory with rigorous mode matching method to analyze the scattering and polarization conversion characteristics of dielectric periodic structures under oblique plane wave incidence.
2：Sample Selection and Data Sources:
The analysis is based on a dielectric periodic structure composed of two alternating dielectrics with specific permittivities and geometric parameters (e.g., ε1=
3：81, ε2=0, h/d=8, d1/d=2, d2/d=8). List of Experimental Equipment and Materials:
No specific equipment or materials are listed; the study is computational.
4：Experimental Procedures and Operational Workflow:
Numerical simulations are performed to compute power transmission coefficients (PtTE and PtTM) as functions of incident angles (θ and φ) and frequency, using derived equations and matrix methods from the theoretical framework.
5：Data Analysis Methods:
Data is analyzed by plotting variations in transmission coefficients and identifying conditions for complete polarization conversion, with bandwidth calculations based on relative conversion efficiency.
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