研究目的
Investigating the design and performance of a wideband, single-layer reflectarray antenna using polarization rotating unit cells for spatial phase shifting.
研究成果
The study successfully demonstrates a new technique for designing wideband, single-layer reflectarray antennas using polarization rotating unit cells. The prototype exhibits a 3 dB gain bandwidth of approximately 37.4%, with high polarization purity and low side-lobe levels across its operating band. The research highlights the potential of using PRUCs for wideband reflectarray antennas, offering simplicity in design and fabrication.
研究不足
The use of 1-bit phase quantization does not allow for perfect beam collimation, resulting in a reduction of achievable gain. The study focuses on static versions of reflectarrays, limiting the exploration of dynamic or reconfigurable designs.
1：Experimental Design and Method Selection:
The study involves designing a reflectarray antenna using polarization rotating unit cells (PRUCs) as 1-bit spatial phase shifters. The methodology includes theoretical modeling of the PRUCs and their mirror images to achieve 0?/180? phase shifts over a wide bandwidth.
2：Sample Selection and Data Sources:
The research utilizes simulations and experimental measurements of a fabricated prototype. The prototype is a single-layer reflectarray with aperture dimensions of 28.8 cm × 28.8 cm, operating at X-band frequencies.
3：8 cm × 8 cm, operating at X-band frequencies.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The prototype was fabricated using PCB lithography technique, with a 0.5-mm thick RO4003C substrate and a 4.6-mm thick layer of HF031 Rohacell foam. Measurements were conducted using a spherical near-field measurement system.
4：5-mm thick RO4003C substrate and a 6-mm thick layer of HF031 Rohacell foam. Measurements were conducted using a spherical near-field measurement system.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The study includes full-wave simulations of the reflectarray antenna using CST Microwave Studio, fabrication of the prototype, and experimental characterization of its performance, including gain, bandwidth, and polarization purity.
5：Data Analysis Methods:
The performance of the reflectarray was analyzed based on simulation and measurement results, focusing on gain bandwidth, polarization purity, and side-lobe levels.
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