Modelling of electromagnetic scattering from large and general intakes on complex platforms

In the framework of the design of low observable aircraft, one of the most difficult problem is the numerical modelling of aeronautical air intakes with an — usually complex — arbitrary shape. Also the presence of radio absorbing material demands for accurate methods in evaluating the low level scattering for real life problems. In this contribution the use of a full wave approach, based on the Multilevel Fast Multipole Approach (MLFMA) is addressed, for a high fidelity modelling of the whole (real life) aircraft as well as the intake contribution, useful in the design and optimization stage of the intake itself.