“…An alternative to all metallic waveguide filters is the use of circular dielectric resonators [3], [4], [5], [6], [7]. The use of these resonators, either in propagative [8] or in evanescent mode [9], [10] topologies, provides a reduction of around 50% in mass and volume [8], [9], an increase of thermal stability [11], [12], and, if the dielectric rods are all inductive or H plane, an increase of out-of-band rejection and better field distribution (lower voltage magnification factor), because the peaks of electric field within these filters are concentrated inside the dielectric posts, thus producing a smaller level of electromagnetic field, outside the dielectric posts, than in the case of the all metallic filters [13].…”