Abstract
In this paper, the design and simulation of a symmetrical waveguide filter are presented based on the insertion loss method. The designed WR-34 waveguide filter is operating at 28 GHz, where its dimensions are a=4.32mm and b=8.64mm, a fractional bandwidth of 2.15% a return loss level better than 16 dB, a frequency range from 22Ghz to 33 GHz. The structure is a 5th-order bandpass filter with five resonators and six symmetrical circular inductive irises. In order to optimize the frequency response, five tuning screws were added to the center of each resonator, while two other screws were positioned before the first iris and the last iris from the wave ports. The simulation model of the filter is developed in two different simulators ANSYS high-frequency Structure Simulator (HFSS) and CST Studio Suite so as to validate the obtained results and to depict the effects of tuning screws on the S-parameters of the filter while generating scenarios depending on the depth of penetration of each screw.
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