Modeling of mmW and THz Imaging Systems Using Conjugate Field Coupling

We propose a novel technique for efficient and robust modeling of multistatic, multi-dimensional, large-format millimeter-wave/terahertz (mmW/THz) imaging systems. The proposed method significantly reduces the necessary computational resources for the design of electrically large systems of multiple sensors that acquire multi-frequency images, such as imaging radars used in 3D mapping. To alleviate the problem, the radiated and scattered fields are individually computed for the sensor and the target, respectively, using full-wave numerical solvers. Afterwards, the fields are properly combined using conjugate field coupling, thus minimizing the necessary computational resources, without compromising solution accuracy. In this letter, the theoretical background of the technique is presented, along with numerical results for beam steering and raster scanning imaging systems.