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Photo-induced coded-aperture imaging (PI-CAI) based on compressed sensing (CS) at 590 GHz using a WR-1.5 (500??750 GHz) vector network analyser is demonstrated. For a 256-pixel (16 ?? 16) frame, the acquisition time can be reduced by 40%, as compared with PICAI without CS, while maintaining high imaging quality. On the basis of this approach, it is envisioned that real-time (26 fps) THz imaging with...
A tunable lens-coupled annular-slot antenna using a Schottky varactor diode has been designed, fabricated and characterised at 140 to 220 GHz. Simulation results show that the resonant frequency of the annular-slot antenna can be effectively tuned by varying the capacitance of the imbedded varactor diode, with an average tunability of ˜2.5 GHz/fF. Prototype demonstration using a varactor with zero-bias...
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