Title :
FDTD modeling of an artificially synthesized absorbing medium
Author :
Wenhua Yu ; Mittra, R. ; Werner, D.H.
Author_Institution :
Electromagn. Commun. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
Abstract :
We investigate an artificially synthesized absorbing medium by using the finite-difference time-domain (FDTD) and waveguide simulation techniques. The artificial medium comprises a doubly periodic array of lossy electrical and magnetic media (i.e., an /spl epsi/-only and μ-only checkerboard) and we compute its reflection coefficient for normal and oblique angles of incidence. It is demonstrated that, if properly designed, the reflection characteristics of the checkerboard are far superior to those of a uniform material of the same thickness with /spl epsi/=μ.
Keywords :
electromagnetic wave absorption; finite difference time-domain analysis; periodic structures; waveguide theory; FDTD modeling; artificially synthesized absorbing medium; checkerboard; doubly periodic array; periodic structures; reflection characteristics; reflection coefficient; waveguide simulation techniques; Boundary conditions; Computational modeling; Dielectric losses; Dielectric materials; Electromagnetic reflection; Finite difference methods; Magnetic losses; Magnetic materials; Periodic structures; Time domain analysis;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
