SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS
Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction bet...
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National Academy of Sciences of Ukraine, Institute of Radio Astronomy
2025-03-01
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| Series: | Radio Physics and Radio Astronomy |
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| Online Access: | http://rpra-journal.org.ua/index.php/ra/article/view/1464/pdf |
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| author | I. K. Kuzmychov O. S. Lukash O. B. Senkevych O. V. Gribovsky |
| author_facet | I. K. Kuzmychov O. S. Lukash O. B. Senkevych O. V. Gribovsky |
| author_sort | I. K. Kuzmychov |
| collection | DOAJ |
| description | Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction between volume "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors.
Methods and Methodology. Basic quasi-optical techniques were employed. The electric field structures of considered oscillation types were measured using the probe-induced perturbation method. The resonant transmission coefficients of the open oscillating systems and the physical phenomena within them were experimentally studied with the aid of well-known microwave measurement techniques.
Results. A hemispherical open resonator (OR) and a mirror-lens resonator (MLR) have been studied to find that surface oscillations in both resonators are excited on the curvilinear surfaces of the reflectors and interact with the "bouncing ball" oscillations under certain conditions. In the hemispherical OR, this interaction occurs when α/2w1 = 0.927, where α is the radius of the curvilinear reflector aperture and w1 is the radius of the fundamental mode field spot on this reflector. In the MLR, the interaction between the fundamental mode oscillation and the surface oscillation localized on the lens surface is observed when α/2w1 = 1.351.
Conclusions. The condition of small diffraction loss in the OR is known to be α/2w1 ≥ 1, and the possibility of the excitation of surface oscillations in the OR must always be considered because surface oscillations may mislead the researcher when examining solid dielectric specimens for the electrophysical parameters using the OR method. Thus, it is advisable to hold L/R ≤ 0.73 in the hemispherical OR case and L/F ≤ 0.65 in the MLR case. |
| format | Article |
| id | doaj-art-e212e15b846a467b9e9af1de637428df |
| institution | Kabale University |
| issn | 1027-9636 2415-7007 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | National Academy of Sciences of Ukraine, Institute of Radio Astronomy |
| record_format | Article |
| series | Radio Physics and Radio Astronomy |
| spelling | doaj-art-e212e15b846a467b9e9af1de637428df2025-08-20T03:40:37ZengNational Academy of Sciences of Ukraine, Institute of Radio AstronomyRadio Physics and Radio Astronomy1027-96362415-70072025-03-01301657310.15407/rpra30.01.065SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORSI. K. Kuzmychov0O. S. Lukash1O. B. Senkevych2O. V. Gribovsky3O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine, 12, Acad. Proskury St., Kharkiv, 61085, Ukraine O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine, 12, Acad. Proskury St., Kharkiv, 61085, Ukraine O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine, 12, Acad. Proskury St., Kharkiv, 61085, Ukraine Institute of Radio Astronomy of the NAS of Ukraine, 4, Mystetstv St., Kharkiv, 61002, Ukraine Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction between volume "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors. Methods and Methodology. Basic quasi-optical techniques were employed. The electric field structures of considered oscillation types were measured using the probe-induced perturbation method. The resonant transmission coefficients of the open oscillating systems and the physical phenomena within them were experimentally studied with the aid of well-known microwave measurement techniques. Results. A hemispherical open resonator (OR) and a mirror-lens resonator (MLR) have been studied to find that surface oscillations in both resonators are excited on the curvilinear surfaces of the reflectors and interact with the "bouncing ball" oscillations under certain conditions. In the hemispherical OR, this interaction occurs when α/2w1 = 0.927, where α is the radius of the curvilinear reflector aperture and w1 is the radius of the fundamental mode field spot on this reflector. In the MLR, the interaction between the fundamental mode oscillation and the surface oscillation localized on the lens surface is observed when α/2w1 = 1.351. Conclusions. The condition of small diffraction loss in the OR is known to be α/2w1 ≥ 1, and the possibility of the excitation of surface oscillations in the OR must always be considered because surface oscillations may mislead the researcher when examining solid dielectric specimens for the electrophysical parameters using the OR method. Thus, it is advisable to hold L/R ≤ 0.73 in the hemispherical OR case and L/F ≤ 0.65 in the MLR case.http://rpra-journal.org.ua/index.php/ra/article/view/1464/pdfopen resonatormirror-lens resonatorsurface oscillations"bouncing ball" oscillationsresonant transmission coefficientinteraction of oscillations |
| spellingShingle | I. K. Kuzmychov O. S. Lukash O. B. Senkevych O. V. Gribovsky SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS Radio Physics and Radio Astronomy open resonator mirror-lens resonator surface oscillations "bouncing ball" oscillations resonant transmission coefficient interaction of oscillations |
| title | SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS |
| title_full | SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS |
| title_fullStr | SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS |
| title_full_unstemmed | SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS |
| title_short | SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS |
| title_sort | surface oscillations in open resonators with curvilinear reflectors |
| topic | open resonator mirror-lens resonator surface oscillations "bouncing ball" oscillations resonant transmission coefficient interaction of oscillations |
| url | http://rpra-journal.org.ua/index.php/ra/article/view/1464/pdf |
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