Simulation of Active Reflection Coefficient Phenomena of Large Antenna Array Using FEM Domain Decomposition Methods

This letter proposes the application of the finite element tearing and interconnecting method (FETI-2LM), a domain decomposition method (DDM) for the full-wave simulation of a large antenna array (few thousands of radiating elements). The proposed methodology makes it possible to efficiently calculate in a postprocessing step the antenna patterns for steering directions within the desired field of view while taking into account the active reflection coefficients. The methodology is based on an efficient extraction of the embedded radiating elements far-field radiation patterns as well as the generalized scattering matrix (GSM) of the array by implementing massively parallel computers. The beauty of the GSM is its capability to handle the active S-parameters independently of the steering direction. This permits to generate the angular-dependent active reflection coefficients by postprocessing. This implementation is a step forward to provide us with a tool that permits to evaluate by simulation large antenna array, while taking into account all the phenomena and interactions that may degrade the key performances that are required at a higher level, to specify a global system before fabrication.