研究目的
To present a spotlight imaging system integrated with a frequency-diverse aperture for security-screening applications, enabling high-resolution imaging of threat objects in a constrained field-of-view.
研究成果
The W-band spotlight aperture integrated with a K-band frequency-diverse imager enables high-resolution imaging of threat objects in a sub-second timeframe, showing promise for real-time security-screening applications.
研究不足
The paper does not explicitly discuss limitations, but potential areas could include the complexity of tuning mechanisms, frequency band constraints, and scalability to larger scenes.
1：Experimental Design and Method Selection:
The system integrates a W-band spotlight aperture with holographic metasurface antennas for high-resolution imaging and a K-band frequency-diverse aperture for low-resolution detection. The metasurface antennas are dynamically tuned to radiate spotlight patterns.
2：Sample Selection and Data Sources:
A human-size target with a gun phantom as the threat object is imaged.
3：List of Experimental Equipment and Materials:
Holographic metasurface antennas, frequency-diverse aperture, coaxial feed, parallel-plate waveguide, slot-shaped irises.
4：Experimental Procedures and Operational Workflow:
The K-band aperture obtains a low-resolution image of the entire FOV to detect threat objects. The position information is fed to the W-band aperture, which tunes the metasurface antennas to focus on the constrained FOV for high-resolution imaging.
5：Data Analysis Methods:
Image reconstruction techniques are used, with reconstruction time measured for performance evaluation.
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