Sub-THz
Electromagnetic Imaging

“Experimental Validation of Uniformly Undersampled Imaging in 6G D-Band with Interpolation Techniques” advances sub-THz imaging technologies, specifically in the D-band (150 GHz), with a focus on applications within 6G Integrated Sensing and Communications (ISAC). Building upon our previous research in the X-band, we investigated the performance of Rational Thin-Plate Spline (RTPS) interpolation in the D-band and compared it with the established bicubic method. While both techniques demonstrated effectiveness, RTPS exhibited superior capabilities in handling steep gradients within scattered data. Conversely, bicubic interpolation maintained its stability and robustness across a wider range of conditions. This research further integrated our imaging algorithms into a Single Input Multiple Output (SIMO) architecture, providing valuable insights for practical applications in diverse fields, including medical imaging, non-destructive testing, and high-resolution imaging for future communication systems.

Researcher: Chia-Chi Lin (林家琪); Hsin-Jung Yang (楊欣融); Tin-Yang Lin (林庭揚)

“Indoor Millimeter-Wave Imaging Based on Sparsity Estimated Compressed Sensing and Calibrated Point Spread Function” presents a cost-effective indoor millimeter-wave imaging system that leverages compressed sensing (CS) and a novel point spread function (PSF) calibration technique. By employing truncated singular value decomposition (TSVD) for PSF refinement and compressed sensing for image reconstruction, our method effectively reconstructs high-quality images using only 30% of the sampled data. Experimental results with an FMCW radar demonstrate the efficacy of this approach for robust imaging in reduced-sampling scenarios, paving the way for practical applications such as surveillance and medical diagnostics. We are currently exploring the implementation of this method in a 150 GHz imaging system to further enhance the upper limit of imaging resolution. 

Researcher: Pei-Chen Yu (余佩真) and Hsin-Jung Yang (楊欣融)