TREMA-Maturation

The developments of calculation methods for the simulation have long since become a major issue for our industries (civil or military) for product design and understanding of physical phenomena involved. Among these developments, those relating to the methods of explicit approximate calculation of complex objects of electromagnetic radiation have the advantage: -to simplify the calculation and make it faster than a conventional numerical method and to optimize existing hybridization methods. -to allow easier parameterization of the influence of each contributor according to its geometry, its electrical characteristics, and enlightenment, -to facilitate the understanding, prediction and diffraction behavior analysis. These methods have been the subject of TREMA project (REcherche work on ME Analytical Modeling and Applications) from January 2012 to January 2015 on three subjects, First task: calculation of electromagnetic radiation of a small size 3D element on an imperfect conductive pattern, 2nd task: Calculation of near field electromagnetic coupling between two antenna elements in an object imperfectly conducting, 3rd task: Developments for quick calculation of the Near Field Optical Physics on large structures, where innovative solutions have been determined. Thus, the original analytical and hybrid methods that were defined during the ASTRID TREMA, can be integrated into existing computer codes that they are accurate (ASERIS) or approximate (Optical Physics in SERMAT MBDA methods summing Gaussian beams for code celum) to improve their performance calculation. They will allow codes to be used with fewer resources in order to easier setting next illumination, the geometry and electrical properties of the object studied. The proposed work should enable optimization opportunities (geometric shapes, materials ...) which are difficult to purely digital classics approaches. In this context, we propose to perform: -in Task 1: integration and development of the original hybrid method defined in the ASTRID TREMA for a simple determination of the influence on the radiated field of the coupling between antennas of diffractive elements, according to the location and characteristics thereof; then analyzing the performance obtained in comparison with other methods, depending on the case of selected validation, -in Task 2: a generalization of the original method was developed and validated during the ASTRID TREMA concerning the fields diffracted by a surface defect, for now consider the case of multiple cavities connected small openings , 2D and 3D, with and without materials. -in Task 3: implementation in the codes of the method for calculating the scattered fields in the near field of the Physical Optics approximation by a surface of small curvature and large dimensions, which have been developed and validated in the ASTRID TREMA and its use for the improvement of asymptotic methods of propagation and diffraction of Gaussian beams.