TEMASEK LABORATORIES Dielectric Resonance in Multi-phase Composites Leader: S. M. Matitsine Members: K. M. Hock, L. Liu, A. Qing, X. Xu, K. N. Rozanov, A. N. Lagarkov, Y. B. Gan

TEMASEK LABORATORIES 10 mm/0.1 mm Cu Fibre in 0.5 mm Carbon Fibre Typical sample To Increase Thickness

TEMASEK LABORATORIES Resonance condition = 2L Resonance shiftf res v/2L = (c/n)/2L = (c/2L)/n = f 0 /n Refractive indexn = Re( r r ) Absorption coeff. = Im( r r ) /n L v r r Background

TEMASEK LABORATORIES Near-field Measurement HP Vector-analyser Metal Plate and sample Frequency : 2 ~ 20 GHz Calculation :,,, HP

TEMASEK LABORATORIES Host - 15% Al powder (15 um) Sample thickness 0.2 mm Sample thickness 1 mm With Cu fibre (10 mm/0.1 mm) and

TEMASEK LABORATORIES Bulk Thin sample Possible Reason for Resonance Shift in Thin Sample

TEMASEK LABORATORIES Measurement Results – Cu fibre resonance

TEMASEK LABORATORIES 2b 2a (Lagarkov, et al 1998) (Lagarkov and Sarychev 1996) d = host permittivity e = effective permittivity Lagarkovs and Sarychevs Theory: - Resonance shift depends on powder size, fibre length and thickness - Powders are assumed to be spherical and non-magnetic

TEMASEK LABORATORIES Scanning Electron Microscope (SEM) Images of Aluminium powder 15 um 5 um 4 um Taken by Gao Xingsen, Dept Mat. Sci., NUS, May 2002

TEMASEK LABORATORIES Impedance Analyzer Measurement - 15% Al Sample

TEMASEK LABORATORIES HFSS * Simulation – Cu fibre in anisotropic host (15% Al) * FEM simulation - ANSOFT = 6 = 33

TEMASEK LABORATORIES HFSS * Simulation – Cu fibre in 15% Al host * FEM simulation - ANSOFT Thickness = 6 = 33

TEMASEK LABORATORIES Compare with Measurement Results Agree Explain by Anisotropy

TEMASEK LABORATORIES