CST – Computer Simulation Technology

Different homogenization methods based on scattering parameters of dielectric-composite slabs

Title:
Different homogenization methods based on scattering parameters of dielectric-composite slabs
Author(s):
Jiaran Qi,1 Henrik Kettunen,1 Henrik Wallén,1, Ari Sihvola1
Source:
Radio Science
Vol./Issue/Date:
Volume: 46, Issue: 5, 11 August 2011
Year:
2011
Page(s):
1-7
Keywords:
S parameter retrieval, dielectric composite, effective permittivity, quasi-static estimate
Abstract:
The dispersion of the effective permittivity of a dielectric-composite slab is analyzed in a quasi-dynamic range using the simulated transmission and reflection data from the slab illuminated by an obliquely incident plane wave. Based on the retrieval results, the procedure for finding the dynamic trust region of the quasi-static Lord Rayleigh estimate for the effective permittivities of such composites is then developed. According to this process, the upper frequency limit of this trust region is numerically determined by an interpolation function. The proposed function of the inclusion area fraction p and relative permittivity "i is demonstrated as a good predictor within the ranges 0.1 = p = 0.5 and 10 = "i = 60. It is further shown that within the above ranges the effective wavelength inside the material should be at least 33 times the edge length of the unit cell, in order to ensure that the defined relative difference between the retrieved effective permittivity and the quasi-static estimate is not larger than 1%.
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