Dependence of coupling coefficient between dielectric resonator (DR) and rectangular waveguide versus geometrical
parameters and permittivity of material is discussed in this paper. The coupling coefficient was estimated in terms of
scattering matrix approximation calculated by finite element method. The method of improvement of dielectric resonator
coupling with rectangular waveguide is proposed. Such effect was achieved by insertion of dielectric discontinuity
perpendicular to DR's electrical field. It results in increasing of attenuation in band–stop filters and decreasing of
insertion loss in band-pass filters. Thermal stabilization method for resonant frequency of composite dielectric resonator
is discussed.
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