Electromagnetic modeling of planar almost periodic structures

After the presentation of almost periodic structures and their interest in circuits, antennas and diffraction, one focus the study on bidimensional structures which have periodic cells but non periodical patterns inside the cells. The bi-dimensional leaky waves antennas array with a central feed and the circuit in package made up with metallic via in an arbitrary arrangement are particular cases of almost-periodic structures. Two numerical methods are used for modeling the almost periodic planar structures: the method of moments and the wave concept iterative procedure.