TAILORING THE PROPERTIES OF LOW-LOSS DIELECTRICS
13.1 INTRODUCTION
The microwave properties of dielectric materials are usually tuned by chemical methods like doping, slight nonstoichiometry, formation of solid solution or mixtures of dielectrics with opposite τf [1–7]. Santiago and co-workers [3, 8] developed a mechanical compensation technique where a resonator is constructed using two closely spaced identical cylindrical sapphire disks. The thermal expansion of the copper post causes a widening of the gap between the discs, which modulates the resonant frequency with opposite temperature dependence to the permittivity. However, this type of compensation is inherently sensitive to vibrations. Luiten et al. [5, 9] used paramagnetic ...
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