研究目的
To propose and study a uniform circular array with dual orbital angular momentum modes for in-band full-duplex applications, focusing on suppressing self-interference caused by mutual coupling among antenna elements.
研究成果
The proposed dual-OAM-mode UCA architecture effectively suppresses self-interference from mutual coupling, achieving high isolation (40 dB) over a wide bandwidth (21.3%). The OAM mode-selection method enables good radiation patterns and mode purity, facilitating potential extensions to multi-link systems for improved spectrum efficiency in full-duplex communications.
研究不足
The study is limited to line-of-sight full-duplex communication applications. The radiation patterns show large side lobes due to relatively large element spacing, and phase imbalances in the feeding network affect performance at frequencies offset from the central design frequency. The method may not be suitable for non-symmetric layouts or environments with significant multipath interference.
1：Experimental Design and Method Selection:
The study involves designing a dual-OAM-mode uniform circular array (UCA) with two concentric ring subarrays for transmitting and receiving. An OAM mode-selection method is derived to suppress self-interference from mutual coupling. Full-wave simulations and measurements are used to validate the design.
2：Sample Selection and Data Sources:
A prototype UCA is fabricated with specific dimensions and materials, operating at Ku-band frequencies. Data is collected through simulations and experimental measurements.
3：List of Experimental Equipment and Materials:
The UCA consists of aperture-coupled microstrip antenna elements, feeding networks with power dividers and phase shifters, and substrates with specified permittivity and thickness. Equipment includes simulation software and measurement tools for VSWR, isolation, and radiation patterns.
4：Experimental Procedures and Operational Workflow:
The UCA is designed, simulated, fabricated, and measured. Steps include configuring the array, applying the feeding network with phase compensation, and performing impedance matching, isolation, and radiation pattern tests.
5：Data Analysis Methods:
Data is analyzed using full-wave simulation tools and measurement techniques to evaluate VSWR, transmission coefficients, mutual coupling, and OAM mode purity. Statistical methods and comparative analysis with simulations are employed.
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