Miniaturization of folded circular SIW cavity filters

Abstract This contribution presents miniaturization techniques for folded circular substrate integrated waveguide (FCSIW) cavity filters. The cavities support dual-mode operation. Two of these are combined to form a fourth-order filter. filter designs implemented. first one serves as reference and exhibits good manufacturability. For the second one, is modified, which leads $50\%$ more compactness. experimentally verified with 10 GHz bandpass Even though achieved level compactness requires higher technological effort, measurements validate concept. out-of-band rejection exceeds 40 dB between 11.2 30 11.3 33 miniaturized one. implemented components compared state-of-the-art