K. Kimsis, J. Semenjako, and Y. V. Shestopalov, “Effectively Tunable Bandpass Waveguide Filter Based on Incorporation of Coupled Cylindrical Resonators Cut in Half”, ECCE, vol. 16, no. 2, pp. 78–87, Dec. 2020, doi: 10.2478/ecce-2020-0012.