Voltage-tunable oscillator with dielectric resonator including a ferroelectric ceramic material
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
Aug 6, 2001
filing date -
Feb 5, 1999
priority date (Note) -
Expired
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Abstract
A voltage-controlled oscillator including a dielectric resonator having a ferroelectric ceramic material placed between two metallized surfaces and biased by an electric field created by a difference in potential applied between the two surfaces as a function of a tuning frequency of the oscillator. Also included is a load impedance, and an active amplifier element coupled between the dielectric resonator and the load impedance. Further, the ceramic material is formed by metal oxides of the family: Ba.sub.x; Sr.sub.(1-x) Ti.sub.(1-y) (A).sub.y O.sub.3 (1) in which: A is a constituent configured to reduce dielectric losses of the material, and -0.4.ltorsim..times..ltorsim.0.9-0.001.ltorsim.y.ltorsim.0.2.
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