研究目的
To propose a dual-layer active reflectarray configuration for broad-band beam-steering and frequency-tunable applications, aiming to achieve wider bandwidths and good frequency reconfigurability compared to existing varactor-based designs.
研究成果
The proposed dual-layer reflectarray cell achieves a 318° phase agility over a 14.6% frequency range and 9-10% 1-dB gain bandwidths for beam-steering up to ±40°, demonstrating improved bandwidth and reconfigurability over existing varactor-based designs. It offers potential for RF applications like radar and satellite communications, with future developments aimed at dual-band and dual-polarization capabilities.
研究不足
The reflectarray prototype has a small size leading to high spillover losses and low aperture efficiency. The design is optimized for bandwidth but not for other antenna performances like gain efficiency. Future work is needed for dual-band and dual-polarization applications.
1：Experimental Design and Method Selection:
The design involves a unit cell with two stacked rectangular patches loaded with a single varactor diode for dynamic phase tuning. The infinite array approach is used for analysis with a normally incident plane wave. The varactor diode is modeled with an equivalent circuit considering parasitic effects.
2：Sample Selection and Data Sources:
An X-band reflectarray cell is designed and fabricated, with dimensions and materials specified (e.g., Diclad870 substrate).
3：List of Experimental Equipment and Materials:
Includes varactor diodes (Microsemi MV31011-89), substrates (Diclad870), and measurement setup with horn antennas.
4：Experimental Procedures and Operational Workflow:
The cell is fabricated and tested using a far-field measurement setup. DC-biasing lines are designed and printed, with voltages varied from 0V to 20V to change diode capacitance. Reflection phase and gain patterns are measured.
5：Data Analysis Methods:
Data is analyzed to determine phase agility, bandwidth, and beam-steering capabilities, with comparisons to existing designs.
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