研究目的
To propose a method for implementing reconfigurable beam radiation using a holographic artificial impedance surface (HAIS) at the terahertz band, achieving single main beams with low side lobes and high gain.
研究成果
The proposed HAIS design successfully achieves reconfigurable single main beams at various elevation angles with high gain and low side lobes, avoiding complex feeding networks. The matrix approximation method enables effective beam steering, and numerical results validate the approach. Future work could involve physical implementation and broader beam scanning capabilities.
研究不足
The study uses ideal models for THz switches due to their current unavailability, which may not reflect real-world performance. The design is limited to numerical validation without physical experimentation, and the reconfigurable beams are demonstrated for specific elevation angles only.
1：Experimental Design and Method Selection:
The study employs holographic technology and surface wave theory to design a HAIS. Modified modulation equations are used for single main beam radiation, and MSHIS is introduced for side lobe suppression. Matrix approximation is proposed for beam reconfiguration. Numerical simulations are conducted using Ansoft HFSS for eigen-mode analysis and impedance extraction.
2：Sample Selection and Data Sources:
A prototype HAIS is designed with a size of 4.7λ×3.5λ at 1 THz. The unit cell dimensions are based on Floquet theory, with a substrate of Rogers Duroid5880 (dielectric constant 2.2, thickness 18.84 μm), and cell size a = 46 μm.
3：7λ×5λ at 1 THz. The unit cell dimensions are based on Floquet theory, with a substrate of Rogers Duroid5880 (dielectric constant 2, thickness 84 μm), and cell size a = 46 μm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes Ansoft HFSS simulator. Materials include Rogers Duroid5880 substrate, metal patches, and ideal THz switches (modeled as metal posts or separations due to unavailability).
4：Experimental Procedures and Operational Workflow:
The process involves designing unit cells, extracting surface impedance using HFSS, applying modulation equations, incorporating MSHIS for suppression, using matrix approximation for reconfiguration, and simulating radiation patterns.
5：Data Analysis Methods:
Data is analyzed through numerical simulations in HFSS, evaluating radiation patterns, return losses, and gains. The L-1 norm is used in matrix approximation for error measurement.
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