Title :
Limits for the effective permittivity of mixtures: numerical validation by the FDTD method
Author :
Kärkkäinen, Kimmo ; Sihvola, Ari ; Nikoskinen, Keijo ; Pekonen, O.
Author_Institution :
Electromagn. Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
Reports the results of an extensive numerical analysis of electromagnetic fields in random dielectric materials. The effective permittivity of a two-dimensional dielectric mixture is calculated by FDTD simulations of such a sample in a TEM-waveguide. Various theoretical bounds are tested in light of the numerical simulations. The results show how the effective permittivity of a mixture with random inclusion positionings is distributed. All possible permittivity values lie between Wiener limits, and according to FDTD simulations the values are almost always between Hashin-Shtrikman limits
Keywords :
dielectric materials; dielectric waveguides; electromagnetic fields; permittivity; remote sensing; waveguide theory; 2D dielectric mixture; EM fields; FDTD method; FDTD simulations; Hashin-Shtrikman limits; TEM-waveguide; Wiener limits; effective permittivity; environment; numerical analysis; numerical simulations; numerical validation; random dielectric materials; random inclusion positionings; Dielectric materials; Electromagnetic radiation; Electromagnetic waveguides; Finite difference methods; Frequency; Optical reflection; Permittivity; Slabs; Space missions; Time domain analysis;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.771602
