Design of dual mode dielectric resonator (DR) filter

In this study, Dual Mode Filter (DMF) structures operating in Ka-Band were designed, manufactured and measured, and also simulation and measurement results were compared. In the first stage of the thesis, a DMF was designed by using two vacuum filled cavities coupled to each other via a cross iris. At this stage, two types of filters were designed. One of them did not have tuning screws in the cross iris and the other one had tuning screws. In the first stage of the design, the dimensions of the structure were calculated in 3-dimensional (3D) simulator by using the coupling matrix approach. In order to obtain the desired frequency characteristics, filter dimensions were optimizated according to the 3D simulation results. In order to make the filter bandwidth and the positions of the Finite Transmission Zeros (FTZ) adjustable, tuning screws were added to the cross iris as a new approach in the literature. In the second stage, dielectric resonators (DR) were added to each of the vacuum filled cavities and two types of Dual Mode Dielectric Resonator Filter (DMDRF) structures were designed, with and without tuning screws at the cross iris. 3D simulation and measurement results were compared. For the mounting of DRs on the source/load coupling slots, mounting protrusion were defined as a new approach in the literature.