Novel Triple-mode Dielectric Cavity Filter Using Grooved Dielectric Resonator

In this paper, the TE
_01δ
mode and the two degenerate HEH
₁₁
modes of traditional high dielectric cylinder resonator are gathered in frequency by grooving the puck in four directions, resulting in a hybrid triple mode resonator with high Q factor. A compact and low loss one-cavity triple-mode filter is then designed with such a resonator. Good features like low loss, sharp rejection and compact size are demonstrated by the measured results.