研究目的
To investigate the beam-steering characteristics of a highly directive photoconductive dipole phased array antenna at 1.95 THz for terahertz imaging applications, particularly for detecting concealed explosives like RDX, TNT, and HMX, by improving gain and directivity using a frequency selective surface and enabling beam steering without mechanical components.
研究成果
The highly directive (2×2) photoconductive dipole phased array antenna at 1.95 THz successfully achieves beam steering through uniform progressive phase shifts, with steering of 3° in E-plane and 1° in H-plane per 10° shift. This enhances capabilities for detecting concealed explosives in terahertz imaging applications, offering a compact, planar solution without mechanical components. Future work should focus on experimental validation and extending to near-field imaging techniques.
研究不足
The study is based on simulations without experimental validation. Limitations include potential mismatch between antenna and feed network with increased phase shift, reduction in main lobe magnitude during steering, and challenges in generating time-delayed THz beams for near-field applications. The technique may have constraints in scanning range and efficiency.
1：Experimental Design and Method Selection:
The study uses a theoretical framework and numerical simulations to model and analyze a (2×2) photoconductive dipole phased array antenna with a frequency selective surface (FSS). Beam steering is achieved through uniform progressive phase shifts applied to optical excitations.
2：Sample Selection and Data Sources:
The antenna is designed for operation at 1.95 THz, targeting explosives with spectral fingerprints in 1.4–2.2 THz range. No physical samples are used; simulations are based on material parameters.
3：95 THz, targeting explosives with spectral fingerprints in 4–2 THz range. No physical samples are used; simulations are based on material parameters. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Materials include Ti-Au for antenna elements, LT-GaAs and GaAs substrates, copper for FSS, and polytetrafluoroethylene for FSS substrate. Equipment includes CST Microwave Studio for simulations.
4：Experimental Procedures and Operational Workflow:
The antenna parameters are optimized using algorithms. Simulations are performed in CST Microwave Studio's Transient Solver with FIT, applying phase shifts along x-axis, y-axis, and both axes to study beam steering in E-plane and H-plane.
5：Data Analysis Methods:
Results include S-parameters, directivity, main lobe direction, angular width, and side lobe levels, analyzed to evaluate beam steering performance.
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