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Dielectric Resonance in Multi-phase Composites Study

Research on dielectric resonance in composites with varying phases for advanced material analysis and RF applications. Investigates resonance shift phenomenon in thin samples and its relation to materials' properties.

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Dielectric Resonance in Multi-phase Composites Study

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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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