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Full-Text Articles in Engineering
Engineered Carbon-Nanotubes Based Composite Material For Rf Applications, Emmanuel Decrossas, Mahmoud El Sabbagh, Samir M. El-Ghazaly, Victor Fouad Hanna
Engineered Carbon-Nanotubes Based Composite Material For Rf Applications, Emmanuel Decrossas, Mahmoud El Sabbagh, Samir M. El-Ghazaly, Victor Fouad Hanna
Electrical Engineering and Computer Science - All Scholarship
Electrical properties of nano-composite materials are extracted to investigate the possibility to engineer novel material for microwave applications. A measurement setup is developed to characterize material in a powder form. The developed measurement technique is applied on nano-particles of alumina, carbon nanotubes (CNTs), and composite mixture of carbon nanotubes and alumina. The effect of packing density on dielectric constant and loss tangent is thoroughly characterized experimentally. The obtained results show that the real part of effective permittivity may be considerably enhanced by increasing the percentage of conducting nano-particles. In addition, it is possible to decrease the loss in a material …
Rigorous Characterization Of Carbon Nanotube Complex Permittivity Over A Broadband Of Rf Frequencies, Emmanuel Decrossas, Mahmoud El Sabbagh, Victor Fouad Hanna, Samir M. El-Ghazaly
Rigorous Characterization Of Carbon Nanotube Complex Permittivity Over A Broadband Of Rf Frequencies, Emmanuel Decrossas, Mahmoud El Sabbagh, Victor Fouad Hanna, Samir M. El-Ghazaly
Electrical Engineering and Computer Science - All Scholarship
This work presents a comprehensive characterization of the frequency dependence of the effective complex permittivity of bundled carbon nanotubes considering different densities over a broadband of frequencies from 10 MHz to 50 GHz using only one measurement setup. The extraction technique is based on rigorous modeling of coaxial and circular discontinuities using mode matching technique in conjunction with inverse optimization method to map the simulated scattering parameters to those measured by vector network analyzer. The dramatic values of complex permittivity obtained at low frequencies are physically explained by the percolation theory. The effective permittivity of a mixture of nano-particles of …