Title page for ETD etd-10042006-143843
|Type of Document
||Kashani, Mohammad Mansour Riahi
||Formulation, development, and characterization of magnetic pastes and epoxies for thick film inductors
|Elshabini-Riad, Aicha A.
|Johnson, Lee W.
|Nunnally, Charles E.
|Riad, Sedki Mohamed
- Thick-film circuits
- Thick films
|Date of Defense
Inductors and transformers constitute two important magnetic components
In RF and power hybrids electronic circuitry. Thick film inductors have been
subject of extensive research in recent years because they significantly reduce the
weight and size, and increase the frequency of operation of electronic circuits. The
research work in this dissertation is aimed at the formulation of thick film ferrite
pastes and ferrite epoxies and the design, construction, and evaluation of thick film
spiral inductors. Wideband characterization (DC - 2GHz) of ferrite pastes, ferrite
epoxies, and ferrite substrates is performed using two techniques. These techniques
are based on current image and transmission line (coaxial cavity) concepts for low
(DC-IOOMHz) and high (50MHz-2GHz) frequency regions, respectively. They are
used to evaluate the permeability spectra of formulated and commercially available
thick film magnetic materials in respective frequency ranges.
A method to numerically calculate the inductance of thick film circular
spiral inductors based on modeling the spiral as concentric circles is presented. A
novel method for fine as well as coarse tuning of thick film inductors is also
introduced. The tunable inductors are constructed using formulated ferrite epoxies
and magnetic cores. The method of analysis of variance is used to investigate the
variation significance of tunable inductors. Finally, chemical and mechanical
properties of developed magnetic materials are discussed. The studied properties
include, glass transition temperature, degradation temperature, thermal coefficient
of expansion, adhesion, particle-size distribution and particle densifi cat ion , grain
size, and compositional constituents of the magnetic materials.
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