研究目的
To present a steerable, circularly polarized planar antenna operating at 2.45 GHz with the capability of steering the beam in an arbitrary direction while maintaining omnidirectionality and circular polarization characteristics.
研究成果
The paper presents a low cost, electronically controlled, circularly polarized reconfigurable planar antenna capable of steering a circularly polarized beam in the desired direction over the entire 360° range, while maintaining a consistent 3 dB gain and an axial ratio of less than 2 dB in the desired direction. The antenna is suitable for applications where circular polarization is desired, with the added capability of either operating as an omnidirectional radiator or an electronically steerable antenna.
研究不足
The antenna has a narrow bandwidth of approximately 2%, similar to the active element. The resonant frequency for the manufactured antenna is shifted to 2.48 GHz.
1：Experimental Design and Method Selection:
The design employs a central omni-directional circularly polarized active element surrounded by electronically controllable parasitic elements. The reconfiguration mechanism is based on the Uda-Yagi scheme, utilizing PIN diodes as RF switches to redirect radiation.
2：Sample Selection and Data Sources:
The antenna was fabricated using Rogers RO4003 substrate. The design synthesis involved optimization of geometrical parameters using CST Microwave Studio.
3：List of Experimental Equipment and Materials:
Rogers RO4003 substrate, PIN diodes, SMA pin for feeding.
4：Experimental Procedures and Operational Workflow:
The design synthesis was split into three stages: optimization of geometrical parameters, implementation of configurability, and optimization for circular polarization with low axial ratio.
5：Data Analysis Methods:
The performance was assessed based on radiation pattern, axial ratio, and reflection coefficient measurements.
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