A Fast Scanning W-Band System for Advanced Millimetre-Wave Short Range Imaging Applications

Frequency Scanning Based Radar System

“…The use of active antenna arrays with electronicallycontrolled phase shifters is another option, but again the technological (and economical) complexity may limit its deployment [16,17]. Figure 1 summarizes the concepts of range-based radars (fixed antenna beam) and beam-scanning systems, showing the amount of information provided in each case.…”

Terahertz frequency scanning 8×1 antenna array for imaging applications

“…Terahertz (THz) imaging techniques have recently awoken considerable interest due to their multiple applications in a wide variety of fields, such as non-destructive testing [1], detection of buried or concealed weapons [2], or objects in general [3], non-invasive diagnostics [4], etc. In active imaging systems [1], [2], the scene is illuminated with millimeter wave, sub-millimeter wave, or terahertz radiation and the amount of power reflected by or that has passed through the different targets is measured.…”

“…In active imaging systems [1], [2], the scene is illuminated with millimeter wave, sub-millimeter wave, or terahertz radiation and the amount of power reflected by or that has passed through the different targets is measured. Multiple types of illuminations of the object under investigation can be chosen, using single frequency [5], multi-frequency [5]- [7] or Ultra Wide Band (UWB) signals [8].…”

SUB-MILLIMETER WAVE FREQUENCY SCANNING 8 x 1 ANTENNA ARRAY

“…In these systems [23,24], the scene is illuminated with millimeter wave, sub-millimeter wave, or terahertz radiation and the amount of power reflected by or passed through different targets is measured. Multiple types of illuminations of the object under investigation can be chosen, using single frequency [25], multi-frequency [26,27] or Ultra Wide Band (UWB) signals [28].…”

“…Different measurement setups have been proposed, based on mechanically rotating mirrors, combined with a linear movement of the probe [23], a rotary scanner with variable radius [29], etc. The measurement equipment can be reduced to a minimum when using a Vector Network Analyzer (VNA), along with auxiliary circuitry [27].…”