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The temperature coefficient of resonant frequency of a microwave dielectric material ($\tau _{f,s}$ ) is defined as the $\tau _{f}$ of an ideal resonant system that is homogeneously filled with this material, while it is usually measured as the $\tau _{f}$ of a nonideal resonant system ($\tau _{f,r}$ ) such as a cavity dielectric resonator. In the present work, finite element analysis is used...
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