Abstract
The effective procedure for spectrum sparseness of natural oscillations of double-mirror open resonators (OR) is proposed. It is based on the placement of scatterers with a specially determined geometric profile on one of the mirrors surface, forming the single mode-selective reflector. This procedure is used to synthesize two profiles of these scatterers for OR with flat and cylindrical mirrors. We propose the rectangular metal bar and the echelette-corner reflector with three rectangular steps symmetric to the plane of resonator symmetry. These scatterers placed on the flat OR mirror provide a minimal effect on the spatial-frequency characteristics of the operating natural oscillation, and significantly reduce the Q-factor of most of the rest oscillations. The spectral characteristics of the OR with these inserts are calculated for excitation by the current source and the eigen mode of a supply waveguide. The possibility of significant decrease in the number of OR natural oscillations is shown, in comparison with the resonator without these scatterers. The effect of increasing the radiation Q-factor of operating oscillation is observed using the echelette-corner scatterer. The technique used to determine the scatterers geometric profile is suitable for spectrum sparseness of the OR of arbitrary dimensions with mirrors of any shapes.
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Acknowledgments
The author expresses his sincere gratitude to Doctor of Phys.-Math. sciences Professor Yu.K. Sirenko, for interest in the research topic, and number of remarks contributed to the improvement of the materials presented in this work.
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Vadym L. Pazynin
The author declares that he has no conflicts of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
The initial version of this paper in Russian is published in the journal “Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika,” ISSN 2307-6011 (Online), ISSN 0021-3470 (Print) on the link http://radio.kpi.ua/article/view/S0021347021100010 with DOI: https://doi.org/10.20535/S0021347021100010
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika, No. 10, pp. 599-611, August, 2021 https://doi.org/10.20535/S0021347021100010 .
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Pazynin, V.L. Sparseness of Natural Oscillations Spectrum for Double-Mirror Open Resonator Using Mode-Selective Scatterers on One of Mirrors Surface. Radioelectron.Commun.Syst. 64, 525–534 (2021). https://doi.org/10.3103/S0735272721100010
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DOI: https://doi.org/10.3103/S0735272721100010