研究目的
To design a wideband circularly-polarized 3D helical array antenna for millimeter-wave applications at 30 GHz, aiming to achieve wide circular polarization bandwidth, high gain, and low axial ratio.
研究成果
The proposed 3D helical antenna array achieves a matching bandwidth of 7.5 GHz (25.1%), a 3-dB axial ratio bandwidth of 8.2 GHz (27.7%), and a realized gain of over 10.3 dB at 30 GHz, making it suitable for millimeter-wave circular polarization applications. Future work could involve experimental verification and optimization for broader applications.
研究不足
The study is based on simulations without experimental validation; potential limitations include real-world fabrication challenges, environmental effects, and scalability to larger arrays.
1：Experimental Design and Method Selection:
The design involves a 2x2 axial-mode helical structure fed by a sequential phase feeding network to achieve wide circular polarization bandwidth. Full-wave analysis is performed using CST Microwave Studio simulation software.
2：Sample Selection and Data Sources:
The helical antenna geometry is based on prior work [3], with modifications for a 2x2 array. Simulations are used to generate data on reflection coefficient, radiation pattern, axial ratio, and gain.
3：List of Experimental Equipment and Materials:
Simulation software CST Microwave Studio is used; no physical equipment is mentioned.
4：Experimental Procedures and Operational Workflow:
The four helical elements are excited with equal amplitude via power dividers and sequential phase differences (0°, 90°, 180°, 270°). Simulations are conducted to analyze performance metrics.
5：Data Analysis Methods:
Analysis includes calculating reflection coefficient (S11 < -10 dB), axial ratio (<3 dB), realized gain, and radiation patterns (RHCP and LHCP) using the simulation results.
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