研究目的
To design a broadband circularly polarized array antenna with a modified feed network, utilizing semi-fractal elements to reduce radar cross section (RCS) and improve performance characteristics such as axial ratio and impedance bandwidth.
研究成果
The proposed CP array antenna achieves a broadband performance with a 3 dB axial ratio bandwidth of 1.23 GHz and impedance bandwidth of 24.77%, along with reduced RCS. It demonstrates good agreement between simulation and measurement, making it suitable for WLAN/WiMAX applications.
研究不足
The use of FR4 substrate may limit performance compared to higher-quality materials; the antenna size and gain might be constrained by the design choices.
1：Experimental Design and Method Selection:
The design involves a CP array antenna with a modified feed network and semi-fractal aperture coupled structure. Simulations were conducted using HFSS software for optimization.
2：Sample Selection and Data Sources:
A prototype antenna was fabricated using FR4 substrates.
3：List of Experimental Equipment and Materials:
FR4 substrates (relative permittivity
4：4, loss tangent 02), microstrip feed lines, SMA connectors, Agilent 8722ES vector network analyzer, standard linearly polarized horn antenna. Experimental Procedures and Operational Workflow:
The antenna element was designed with iterative semi-fractal patches, fabricated, and measured for S11, axial ratio, gain, radiation patterns, and RCS.
5：Data Analysis Methods:
Parametric studies in HFSS, comparison of simulated and measured results for validation.
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