研究目的
To design, realize, and measure a prototype metasurface antenna for data downlink from LEO satellites, radiating a sectoral beam with isoflux envelope to achieve higher gain and Earth coverage through mechanical rotation.
研究成果
The prototype MTS antenna was successfully designed and realized for LEO satellite data downlink, demonstrating the feasibility of using a flat metasurface configuration with mechanical rotation for isoflux beam coverage. Despite damage during assembly, the measurements show potential, but further optimization and careful handling are needed to align with numerical predictions.
研究不足
The prototype was damaged during assembly, causing discrepancies between experimental and numerical results, including a frequency shift of 350 MHz and pattern shape differences. This limits the accuracy of the measurements and highlights issues with structural integrity and assembly processes.
1：Experimental Design and Method Selection:
The design involves a modulated metasurface (MTS) antenna fed by a circular waveguide, using an adiabatic formulation of Floquet modes for controlling the aperture field. Numerical simulations were performed with a MoM solver.
2：Sample Selection and Data Sources:
A prototype was built using a grounded dielectric slab with metallic patches, and measurements were conducted on the damaged prototype.
3：List of Experimental Equipment and Materials:
Radiative panel with Rogers TMM10i substrate (permittivity
4：8, thickness 508 mm), feeding structure with rectangular and circular waveguides, aluminum components, and a rotary joint. Experimental Procedures and Operational Workflow:
The antenna was assembled, but the radiative panel was damaged during assembly, leading to curvature and substrate breakage. Measurements included directivity patterns and S11 parameter in the
5：15-65 GHz band. Data Analysis Methods:
Comparison of measured results with numerical predictions from full-wave simulations.
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