Submillimetric high resolution passive imaging system using synthesis aperture technique

This paper presents a G-band [140-220 GHz] high resolution passive imaging system for personal security applications. The spatial resolution depends on the size of the antenna. Since a spatial resolution of 1 cm, at a distance of 5 m requires a very large aperture antenna equal to 1 m at 140 GHZ, so it is difficult to achieve a compact system. The synthesis aperture technique allows to reduce the size of the system,while keeping a good spatial resolution. To apply this technique, the studied system is a Y-shaped radiometric interferometer. One of the advantages of such a system, is that there are no moving part, and the size of the synthesized aperture is easily expandable to meet more uses. The system design, simulated performances, and realized monolithic microwave integrated circuits results are presented.