A new local model for small apertures in a multi-domain approach

In this paper, we first re-examine the model of small apertures with equivalent dipoles and obtain, for each aperture, 3 basis functions that only need a local meshing of the aperture, the environment being replaced with an infinite perfectly conducting plane. In a second step, we plan to introduce this representation of the fields close to the aperture in a full wave 3D modeling. Two strategies can be investigated. The first based upon the equivalent principle is divided into two steps: evaluation of the external problem, then internal problem (neglecting the feedback retroaction). The second one is based on the scattering matrix of each domain (outside and inside) and on application of final interconnection with boundary conditions. In this paper, we concentrate on the first step and modify the classical process by expending the field on the aperture on the first computed basis functions introducing the expression of the field on the aperture expended on the firstly computed basis functions.