研究目的
To analyze the influence of a metasurface coupled to a rectangular microstrip antenna for converting linearly polarised electromagnetic waves into circularly polarised electromagnetic waves.
研究成果
The proposed structure effectively converts linearly polarised waves into circularly polarised waves with good results for axial ratio, axial bandwidth, and return loss. The structure is feasible for RFID applications and shows good agreement between simulated and measured results.
研究不足
The study focused on a specific frequency (2.45 GHz) and used a particular type of dielectric material. The bandwidth achieved was slightly lower than the frequency spectrum of a wireless local area network.
1：Experimental Design and Method Selection:
The study involved designing a metasurface to convert linearly polarised waves to circularly polarised waves when coupled with a microstrip antenna. The design was based on unit cells arranged in a periodic pattern.
2：Sample Selection and Data Sources:
Prototypes of the microstrip antenna and metasurface were constructed for experimental validation.
3：List of Experimental Equipment and Materials:
The dielectric used was the Rogers Corporation RO4350, with specific permittivity and loss tangent. The metal laminate was copper.
4：Experimental Procedures and Operational Workflow:
The metasurface was positioned at a distance over the antenna, and parameters like return loss, bandwidth, and axial ratio were measured.
5：Data Analysis Methods:
The performance was analyzed using simulation tools and experimental measurements to compare parameters like axial ratio and return loss.
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