LABORATORI NAZIONALI DI LEGNARO
Microwave dielectric ceramics with attractive dielectric properties are being evaluated extensively for substrate and microwave components such as microwave oscillators and filters. These microwave resonators can replace the metallic waveguides and hence possible miniaturization of microwave components can be achieved. The microwave dielectric characteristics of these resonators such as dielectric constant (er), quality factor (Qxf) and temperature coefficient of resonant frequency (tf) imply the extent of miniaturization, selectivity of a particular microwave signal and thermal stability respectively. Alkaline-earth based perovskite dielectric resonators such as Ba(Mg0.33Ta0.67)O3 (er = 24; Qxf = 250,000 GHz and tf ~ 0 ppm/oC) dominate the microwave base station resonator market. However, the expensive tantalum (Ta) demand the research for development of microwave resonators with rare-earth based compounds. In the present talk, observations on the microwave dielectric characteristics of some of the Lanthanide based dielectric resonators will be discussed in the light of structural, spectroscopic aspects.

DATA: 13-05-2013