Enabling Real-Time Near-Field Focusing Imaging with Space-Time-Coding Metasurface Antenna
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Journal / Publication | IEEE Transactions on Antennas and Propagation |
Publication status | Online published - 28 Oct 2024 |
Link(s)
Abstract
This article proposes a microwave near-field focus steerable imaging system operating at 22.5 GHz, built upon a space-time-coding metasurface antenna (STCMA), featuring real-time dynamic sensing capabilities. A novel synthetic method is developed to design the required amplitude envelopes, thereby achieving near-field focusing (NFF) for STCMA. By utilizing a field programmable gate array (FPGA) for encoding the operation of meta-atoms, the designed STCMA is capable of rapidly manipulating sub-wavelength NFF beams along the axis parallel to its long side, achieving an optimal focal length of 60 mm. Scattering fields from the illuminated object are collected by an open-ended waveguide for scene mapping. A calibration procedure, in conjunction with a compensation model, is implemented to counteract measurement errors and inconsistencies, thereby enhancing the imaging quality. MATLAB scripts are developed to refresh the data stream through interactions with FPGA and vector network analyzer (VNA), enabling one-dimensional (1-D) real-time detection and characterization of various concealed metal and dielectric objects with a large field of view (FoV) of 90°. The proposed imager is expanded to achieve two-dimensional (2-D) imaging within seconds by incorporating mechanical translation. The proposed study advances the STCMA technology from the level of component design to that of system application and lays the groundwork for future research into metasurface-based super-resolution real-time imaging at higher frequencies. © 20204 IEEE.
Research Area(s)
- Beam steering, microwave imaging, near-field focusing (NFF), real-time imaging, space-time-coding metasurface antenna (STCMA)
Citation Format(s)
Enabling Real-Time Near-Field Focusing Imaging with Space-Time-Coding Metasurface Antenna. / Huang, Shao-Xin; Wu, Geng-Bo; Dai, Jun-Yan et al.
In: IEEE Transactions on Antennas and Propagation, 28.10.2024.
In: IEEE Transactions on Antennas and Propagation, 28.10.2024.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review