Computation of scattered fields by cavities with radome

Electromagnetic signature of targets with cavities, like inlets of aircrafts and missiles, has been the subject of numerous theoretical and experimental studies. This research arises from the cavity signature characteristics that produce an important field of view (FOV) in regard to radar threats. This paper presents an adaptation of the iterative physical optics (IPO) to solve the problem of electromagnetic scattering by cavities closed by radome. The adaptation consists in replacing the aperture of the cavity by a dielectric material layer. Then, the Fresnel coefficients are used with the IPO algorithm to take into account the dielectric layer characteristics. Results obtained with this method are compared with results from measures and FEM computations