Development of Low-Loss Nizn-Based Ferrite Materials for High-Frequency Applications
This work is an initial response to the demand for miniaturisation of electronic circuits and the shift to higher operating frequencies which has led to the development of high-density low-loss ferrites. In order to meet this demand, a number of necessities, such as fine-grained and homogeneous m...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9452/1/FSAS_1998_39_A.pdf http://psasir.upm.edu.my/id/eprint/9452/ |
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| Summary: | This work is an initial response to the demand for miniaturisation of
electronic circuits and the shift to higher operating frequencies which has led to the
development of high-density low-loss ferrites. In order to meet this demand, a
number of necessities, such as fine-grained and homogeneous microstructure, low
power loss, weak temperature dependencies of losses and of course reasonable cost
of production are required. The first part of the work was to develop the required
material by manipulation of composition. NiZn-based ferrites with various additives
such as MgO, CuO, TiCh, CoO and CaO were chosen and the low loss property
was attained. Subsequently, a systematic crucial approach was started to further
minimise the losses and to extend the operating frequency range. Green compacts
with a particle size average (PSA) of 1.2um, a sintering temperature of about 1140°C and only air atmosphere were needed to reach the research targets. In
conclusion, a composition-microstructure design technique has been successfully
developed, which is capable of producing ferrite materials with the desired
magnetic properties. |
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