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Dielectric Resonance in Multi-phase Composites

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. To Increase Thickness. Typical sample. 10 mm/0.1 mm Cu Fibre in 0.5 mm Carbon Fibre. Background. v. . L. /n.

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Dielectric Resonance in Multi-phase Composites

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  1. 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

  2. To Increase Thickness Typical sample 10 mm/0.1 mm Cu Fibre in 0.5 mm Carbon Fibre

  3. Background v  L /n r r Resonance condition = 2L Resonance shift fres v/2L = (c/n)/2L = (c/2L)/n = f0/n Refractive index n = Re(rr) Absorption coeff.  = Im(rr)

  4. HP HP Near-field Measurement Vector-analyser Metal Plate and sample Frequency : 2 ~ 20 GHz Calculation :’ , ” , ’ , ”

  5. With Cu fibre (10 mm/0.1 mm) Host - 15% Al powder (15 um) Sample thickness 0.2 mm  and   and  Sample thickness 1 mm  and 

  6. Possible Reason for Resonance Shift in Thin Sample Thin sample Bulk

  7. Measurement Results – Cu fibre resonance

  8. Lagarkov’s and Sarychev’s Theory: - Resonance shift depends on powder size, fibre length and thickness - Powders are assumed to be spherical and non-magnetic d = host permittivity e = effective permittivity (Lagarkov and Sarychev 1996) 2a 2b (Lagarkov, et al 1998) 

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

  10. Impedance Analyzer Measurement - 15% Al Sample

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

  12. HFSS* Simulation – Cu fibre in 15% Al host Thickness  = 6  = 33 *FEM simulation - ANSOFT

  13. Compare with Measurement Results Explain by Anisotropy Agree Agree

  14. Thank You

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