AN ELECTRONICALLY TUNABLE DIELECTRIC RESONATOR
Date
1995-05
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ORCID
Type
Degree Level
Masters
Abstract
Dielectric resonators are widely used in a variety of microwave circuits which require a high quality factor (Q), compact, low cost resonant element. Mechanical tuning is the only feasible tuning method if a range of more than 2% of the center frequency is required. Electronic tuning is attractive and such a tuning method using two ferrite disks is proposed and analyzed.
An axial field matching method is developed to compute the resonant frequencies of a dielectric resonator. Comparison of the measured resonant frequencies with those predicted theoretically yielded an error of less than 2.5%. The same method is applied to the electronic tuning case where two thin disks of ferrite material are bonded to the flat faces of a dielectric resonator. Good correlation between the measured and computed results was achieved. However, a very narrow tuning range of only 0.39% for the TM018 mode was possible. As better results have been reported for tuning with one ferrite disk bonded to a resonator, it must be concluded that the two disk method is not the best possible choice for ferrite tuning of a dielectric resonator.
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Degree
Master of Science (M.Sc.)
Department
Electrical Engineering