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IEEE Microwave and Guided Wave Letters
Volume 9 Number 12, December 1999

Table of Contents for this issue

Complete paper in PDF format

FDTD Modeling of an Artificially Synthesized Absorbing Medium

Wenhua Yu, Raj Mittra, and Douglas H. Werner

Page 496.

Abstract:

In this letter 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 -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 = µ.

References

  1. R. Mittra, C. H. Chan, and T. Cwik, "Techniques for analyzing frequency selective surface-review," Proc. IEEE, vol. 76, pp. 1593-1615, Dec. 1988.
  2. T. K. Wu, Ed., Frequency Selective Surface and Grid Array.New York: Wiley, 1995.
  3. C. L. Holloway, R. R. Delyzer, R. F. German, P. McKenna, and M. Kanda, "Comparison of electricmagnetic absorber used in anechoic and semi-anechoic chambers for emissions and immunity testing of digital devices," IEEE Trans. Electromagn. Compat., vol. 39, pp. 33-46, Feb. 1997.
  4. H. L. Bertoni, L.-H. S. Cheo, and T. Tamir, "Frequency-selective reflection and transmission by a periodic dielectric layer," IEEE Trans. Antennas Propagat., vol. 37, pp. 78-83, Jan. 1989.
  5. J. A. Roden, S. D. Gedney, M. P. Kesler, J. G. Maloney, and P. H. Harms, "Time-domain analysis of periodic structures at oblique incidence: Orthogonal and nonorthogonal FDTD implementations," IEEE Trans. Microwave Theory Tech., vol. 46, pp. 420-427, Apr. 1998.
  6. K. S. Yee, "Numerical solution of initial boundary value problem involving Maxwell's equations in isotropic media," IEEE Trans. Antennas Propagat., vol. 14, pp. 302-307, May 1966.