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A broadband coaxial line for electrical characterizations of dielectrics

Suliman Azzabi, Jafer Omer (2014) A broadband coaxial line for electrical characterizations of dielectrics. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Various methods have been used for the measurement of dielectric. The most common techniques are mainly based on coaxial probes, free space and reflection / transmission method by using waveguide or coaxial cell and resonance techniques. The importance of this measurement is attributed to the ability of providing the electrical or magnetic characteristics of the materials, which proved useful in multidisciplinary research. A large co-axial cell has been designed in this study to facilitate this di-electric material measurement. The cell has been calibrated to operate over a frequency range of 10 MHz to 3 GHz. The cell has been designed to be large enough to insert the sample under test inside the cell, the cell is useful for measurement of samples like Teflon or Concrete.Once the S-parameters of the two end sections are calibrated, the S-parameters of the sample region can be found, then the complex permittivity and permeability of the samples can be de-embedded using Nicolson-Ross-Weir (NRW) method. This cell is based upon coaxial transmission line principles by using coaxial cable less-loss equations, where the dimensions of inner and outer conductor diameters are computed by implying aforementioned equations. Computer Simulation Technology software has been used to simulate the dimensional design of the cell, which showed the 50 Ω characteristic impedance as required. The cell was tested and analyzed by using Teflon as a test sample material with a pre-defined permittivity of 2.08 and permeability of 1. The average of the results of permittivity and permeability of Teflon from the designed cell proved to be exactly same as the known values, for a frequency range of 10 MHz to 2 GHz.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Depositing User: Normajihan Abd. Rahman
Date Deposited: 08 Jul 2014 06:35
Last Modified: 08 Jul 2014 06:35
URI: http://eprints.uthm.edu.my/id/eprint/5492
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