A 300 GHz %26quot;Always-In-Focus%26quot; Focusing System for Target Detection

作者：Montero de Paz Javier^*; Enrique Garcia Munoz Luis; Segovia Vargas Daniel

来源：Radioengineering, 2013, 22(2): 610-617.

• Quasi-optical Gaussian beam propagation
• radar
• focusing system
• terahertz imaging

A focusing system for a 300 GHz radar with 5 m target distance and 10 mm diameter spot size resolution is proposed. The focusing system is based on a Gaussian telescope scheme and its main parameters have been designed using Gaussian beam quasi-optical propagation theory with an in-house developed MATLAB (R) based analysis tool. Then, this approach has been applied to a real focusing system based on two elliptical mirrors in order to reduce the distortion and cross-polar level and a plane mirror to provide scanning capabilities. The overall system has been simulated with a full-wave electromagnetic simulator and its behavior is presented With this approach, the focusing system always works %26quot;in-focus%26quot; since the only mirror that is rotated when scanning is the output plane mirror, so the beam is almost not distorted The design process, although based in the well-known Gaussian beam quasi-optical propagation theory, provides a fast and accurate method and minimizes the overall size of the mirrors. As a consequence, the size of the focusing system is also reduced

• 出版日期2013-6