Circular Waveguide Band Pass Filter Composed of Artificial Dielectric Resonators for Transverse Electric Propagation Mode

In this study, the main elements for the filter to be made are circular waveguide and dielectric resonator. The design validity of waveguide is done for one and two connectors with various types of probe length connectors to obtain the best results. Dielectric material is inserted first to determine the effect on the working frequency of the waveguide, then two resonators are employed. Furthermore, filters are made using two different types of materials, namely natural and artificial dielectrics. In natural dielectric resonators, distance and thickness measurements are carried out to yield definite data. This data then becomes a reference for making artificial dielectric resonators. The best frequency response for this simulation is at thickness of 3.2 mm and distance of 6 mm. The artificial dielectric resonators are made by adding conductors with certain patch shapes on the natural dielectric surface. The frequency response of the filter is unsatisfactory due to there is a damping. Therefore, the distance of connectors is closer to each other to eliminate the damping. The result from simulation are 3.75 GHz of center frequency, return loss is 10.298 dB and 250 MHz of -3dB working bandwidth.