研究目的
Investigating the design and performance of a compact multiple-input-multiple-output (MIMO) antenna system with multiple beams for high data rates, better transmission quality, and good diversity performance in 4G and upcoming 5G wireless systems.
研究成果
The proposed 3-element Yagi based MIMO antenna system successfully achieves multiple beams by exciting the 3λg resonating mode of the loop antenna and using multiple director arrays. It demonstrates compact size, high port isolation, low channel correlation, and good radiation pattern orthogonality, making it suitable for access points requiring multiple spatial beams with low complexity.
研究不足
The design's performance might be affected by fabrication tolerances and material properties, as indicated by the slight shift in measured results compared to simulations.
1：Experimental Design and Method Selection:
The antenna system was modeled in HFSS and fabricated using a Protomat-S103 (LPKF) milling machine. The design involves exciting the 3λg loop resonating mode and using multiple director elements to split the single conventional beam of a Yagi antenna into multiple beams.
2：Sample Selection and Data Sources:
The antenna was fabricated on a commercially available FR-4 substrate with a dielectric constant of 3.8 and thickness of 0.72 mm.
3：8 and thickness of 72 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Protomat-S103 (LPKF) milling machine, FR-4 substrate.
4：Experimental Procedures and Operational Workflow:
The antenna elements were placed at 120o with respect to each other in a triangular configuration. The location of each director was optimized based on the maximum current to create a beam.
5：Data Analysis Methods:
The performance was evaluated in terms of bandwidth, gain, front-to-back ratio (FBR), port isolation, and envelope correlation coefficient (ECC).
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