研究目的
To present a decoupling method between two tri-band antennas for WLAN/WiMAX applications, aiming to reduce mutual coupling in a MIMO antenna system with a compact size and simpler structure.
研究成果
The proposed decoupling method effectively reduces mutual coupling in a tri-band MIMO antenna system, achieving measured mutual coupling lower than -18 dB across the bands. The antenna demonstrates good impedance matching, radiation patterns, gain, efficiency, and low ECC, making it suitable for compact terminals in WLAN and WiMAX applications. The design is simpler and more compact compared to existing methods, with potential for integration into various devices.
研究不足
The study is focused on specific frequency bands (2.4, 3.5, 5.8 GHz) for WLAN/WiMAX applications; the design may not be directly applicable to other frequency ranges or more complex multi-band systems without modifications. The use of an FR4 substrate and specific antenna geometry could limit performance in terms of bandwidth or efficiency compared to other materials or designs.
1：Experimental Design and Method Selection:
The study involves designing a tri-band monopole antenna with three separate resonators for different frequencies, then developing a MIMO system with two such monopoles. A decoupling method is implemented using the low-band resonator to suppress surface waves for higher bands and a Ω-shaped metal line to neutralize coupling at the low band.
2：Sample Selection and Data Sources:
A prototype antenna is fabricated on an FR4 substrate with specific dimensions.
3：List of Experimental Equipment and Materials:
FR4 substrate (thickness
4：8 mm), microstrip lines, metal components for antennas and decoupling structures. Experimental Procedures and Operational Workflow:
The antenna is simulated and measured for S-parameters, radiation patterns, gain, efficiency, and envelope correlation coefficient (ECC). Measurements involve exciting one port while terminating the other with a 50 Ω load.
5：Data Analysis Methods:
S-parameters are analyzed for impedance matching and mutual coupling; radiation patterns are plotted; ECC is calculated using a formula based on S-parameters and radiation efficiencies.
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