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Tunable band-stop microstrip stub resonator’s and band-pass microstrip ring resonator’s filters are considered. Influence of structural and topological parameters of the filters on frequency tuning sensitivity to micromovements of resonator components is investigated. Maximal length of stub moving part of band-stop filter based on microstrip stub resonator is defined to achieve frequency tuning without frequency characteristic distortion in operating frequency range. Influence of stub moving part width on frequency tuning sensitivity is demonstrated. A criteria to choose the movable part width of the ring resonator electrode is obtained. Relationship between length of movable and fixed parts to ensure maximal frequency tuning without frequency characteristic distortion is defined. Finite element method (FEM) and equivalent parameters method were used for the structure's frequency characteristics calculation.Ref. 12, Fig. 10
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Chernov et al. (2017) studied this question.
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