研究目的
To design and implement a low profile polarization-reconfigurable transmitarray antenna with a linear polarized feed for achieving high gain and multiple polarization states.
研究成果
The proposed transmitarray achieves high gain, low profile, and polarization reconfigurability with good efficiency and bandwidth. It demonstrates potential for applications in smart communication systems, with future work possibly focusing on further miniaturization and improved robustness.
研究不足
The designed transmitarray has a limited phase range and may be sensitive to manufacturing and testing errors, as indicated by small frequency shifts in measurements. The cross-polarization levels in measurements are higher than simulated, possibly due to environmental impacts.
1：Experimental Design and Method Selection:
The design involves a novel 3D cross dipole element for polarization control, simulated using ANSYS HFSS software with periodic boundaries and Floquet ports. The methodology includes phase shift calculations for beam collimation and polarization transformation from linear to circular polarization.
2：Sample Selection and Data Sources:
A prototype transmitarray with 11x11 elements is fabricated and tested at X-band frequencies, using a linear polarized horn antenna as the feed source.
3：List of Experimental Equipment and Materials:
Includes dielectric substrates (εr=2.65, thickness 1mm), metallic cylinders (diameter 1.2mm), and a fabricated transmitarray prototype (size 198x198 mm2).
4：65, thickness 1mm), metallic cylinders (diameter 2mm), and a fabricated transmitarray prototype (size 198x198 mm2).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The feed antenna is rotated to different angles (e.g., 45°, -45°, 0°, 90°) to switch polarization states. Measurements of reflection coefficient, radiation patterns, gain, and axial ratio are conducted in a far-field setup.
5：Data Analysis Methods:
Data is analyzed using simulation results from HFSS and compared with measured results to validate performance, including bandwidth calculations and aperture efficiency.
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