研究目的
To design a reflectarray for generating wideband circularly polarized (CP) orbital angular momentum (OAM) vortex wave in X band.
研究成果
The proposed reflectarray can generate CP OAM vortex wave with mode l=1 in 9-11 GHz band. These features make the proposed reflectarray a good candidate for future communication system. How to design a reflectarray for generating CP OAM waves with reconfigurable modes remains to be studied further.
研究不足
The proposed reflectarray is designed based on the reflective phase under normal incidence. The impacts of machining errors and test environment cause some deviations between simulated and measured results.
1：Experimental Design and Method Selection:
A dual-linearly-polarized element consisting of two rhombus-shaped metal patches etched on two dielectric substrates is designed. The phase distribution of the reflectarray carrying the OAM vortex wave with mode l=1 is designed, and dimensions of the elements are determined by their reflective phases.
2：Sample Selection and Data Sources:
A 313-element reflectarray with a linearly polarized (LP) Vivaldi feed is fabricated and measured.
3：List of Experimental Equipment and Materials:
Ansoft HFSS software is used to analyze electromagnetic properties of the element.
4：Experimental Procedures and Operational Workflow:
The far-field radiation patterns and near-field phase distributions are simulated to verify the proposed design. The reflectarray is fabricated and its near field distributions at 9 GHz, 10 GHz and 11 GHz are measured by the near-field planar scanning in a microwave chamber.
5：Data Analysis Methods:
The electric field amplitude and phase distributions are detected respectively by using a standard open-ended rectangular waveguide.
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