ABSTRACT
Sufficient spacing from metal walls of the housing is also important since close proximity of conductive walls degrades the high intrinsic Q of the dielectric resonator.
After reviewing literature in the dielectric resonator area, it is obvious that most attention has been directed toward analysis and applications of the fundamental TE01δ mode. Higher order modes and the HE11δ mode, which for certain ratios of diameter/length has a lower resonant frequency than that of the TE01δ mode, are considered spurious and hard to eliminate. Even for a radially symmetrical mode like TE01δ , which has only 3 components of the electromagnetic field, rigorous analysis is still a problem, and various simplifying assumptions are required. The situation is much more complex for higher modes that are generally hybrid, are usually degenerate, and have all six components of the electromagnetic field.
