研究目的
To study a shared aperture 1-bit metasurface for orbital angular momentum (OAM) multiplexing, enabling the generation of OAM vortex beams with different topological charges without increasing system volume.
研究成果
The proposed shared aperture 1-bit metasurface successfully achieves OAM multiplexing with excellent isolation (transmission coefficient below -30dB) and diversity performance (ECC close to 0). The device operates in two modes with stable gain and high radiation efficiency. Experimental results validate the feasibility, demonstrating good agreement with simulations and potential for applications in communication systems without increasing volume.
研究不足
The study is limited to the microwave band (7-7.5 GHz) and specific topological charges (l = -1 and 1). Fabrication tolerances and manual welding may cause deviations in measured results. The aperture efficiency is lower than conventional antennas due to the diverging nature of OAM beams.
1：Experimental Design and Method Selection:
The study involves designing a shared aperture device combining a 1-bit reflective metasurface and an eight-element phased array antenna fed by a phase shift network. Full-wave simulations are conducted to investigate radiation performance, and a prototype is fabricated and measured in an anechoic chamber.
2：Sample Selection and Data Sources:
A prototype of the shared aperture device is fabricated and used for measurements. Simulation data is generated using computational electromagnetic methods.
3：List of Experimental Equipment and Materials:
The device includes a 1-bit metasurface with elements printed on a substrate (εr = 2.2, tanδ = 0.0009), a phased array with radiating patches, and a phase shift network on a substrate (εr = 2.2, tanδ = 0.0009). Measurement equipment includes an anechoic chamber and instruments for S-parameter and radiation pattern analysis.
4：2, tanδ = 0009), a phased array with radiating patches, and a phase shift network on a substrate (εr = 2, tanδ = 0009). Measurement equipment includes an anechoic chamber and instruments for S-parameter and radiation pattern analysis.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The metasurface is configured based on compensated phase distribution. The phased array is excited via the phase shift network. Simulations are performed to analyze radiation patterns and S-parameters. The prototype is measured for S-parameters and radiation patterns, comparing results with simulations.
5：Data Analysis Methods:
S-parameters, gain, radiation efficiency, and envelop correlation coefficient (ECC) are computed. Radiation patterns and E-field distributions are analyzed to verify OAM generation and isolation between modes.
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