RCS OF A PARALLEL-PLATE WAVE-GUIDE CAVITY WITH 3-LAYER MATERIAL LOADING

A rigorous radar cross section (RCS) analysis of a two-dimensional par allel-plate waveguide cavity with three-layer material loading is carr ied out for the E- and H-polarized plane wave incidence using the Wien er-Hopf technique. Introducing the Fourier transform for the scattered field and applying boundary conditions in the transform domain, the p roblem is formulated in terms of the simultaneous Wiener-Hopf equation s satisfied by the unknown spectral functions. The Wiener-Hopf equatio ns are solved via the factorization and decomposition procedure togeth er with rigorous asymptotics, leading to the efficient approximate sol ution. The scattered field in the real space is evaluated by taking th e inverse Fourier transform and applying the saddle point method. Repr esentative numerical examples on the RCS are given for various physica l parameters. It is shown that the three-layer lossy material loading inside the cavity results in significant RCS reduction over broad freq uency range.