TEM mode
Dielectric resonators - Microwave circuits

Metallized tubular ceramics are also referred to as dielectric resonators, thus creating coaxial resonators (fig. 18). The cross-section of the tube can be square, which facilitates flat mounting on a substrate, as shown in figure 19. The resonance modes are of the TEM type with field lines as shown in figure 18. Such a type of resonator is used when insertion losses are less important than volume reduction; this volume for a given frequency is less than for TE₀₁ mode resonators_δ. This type of...