Microwave measurements of Ba2Ti902,, show that this ceramic is uniquely suited for dielectric resonators. (Suitable ceramics should have a high dielectric constant K , a low dielectric loss (high Q), and a low temperature coefficient of resonant frequency, T~. ) At 4 GHz, Ba2Ti9OZ0 resonators have Q >SOW, K =39.8, and r f = 2 ppm/"C. Measurements of Q and T~ were made on unmetallized ceramic resonator disks positioned in a waveguide; K was measured using a dielectric post resonator technique. From 4 to 10 GHz, Q approaches that for a copper waveguide cavity, whereas the temperature coefficient is typically 8 times lower.
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