V.P. Krylov1

1 OJSC “Obninsk Research and Production Enterprise “Technology” n.a. A.G. Romashina” (Obninsk, Russia)

1 info@technologiya.ru

By means of analysis spectrum resonant frequencies for waveguide resonator cavity it is possible to determine sizes of cavity, that are essential for measurement methods of material dielectric properties at measured using adjacent frequencies of similar-type resonance oscillations, but the method for oscillation type determination is not specified. This paper presents measurement results for internal cavity dimensions of waveguide resonator by means of propagation ratio amplitude spectrum using resonant frequencies of various oscillation type, and also specifies determination method for oscillation types corresponding to resonant frequencies. For cylindrical waveguide resonator cavity, we describe oscillation type determination procedure for resonant frequencies in spectrum using electrodynamic model in resonator cavity having wall's perfect conductivity, and determination of sizes of cavity by comparing frequency resonant conditions corresponding to different oscillation types. It was found that such analysis resonant frequencies allow to improve determination of accuracy radius and length of cavity, and to improve determination accuracy of dielectric permittivity. Determination accuracy of dielectric permittivity using measurement method fixed resonator length for various oscillation types having various quality factor was evaluated by means of spectrum resonant frequencies analysis for waveguide resonator cavity with inserted dielectric sample. It was found that high quality factor of main-type resonant oscillations corresponding to the selected resonator design does not guarantee accurate dielectric permittivity measurement for sample material being tested.

Krylov V.P. Resonant frequency spectrum analysis for waveguide resonator cavity. Radiotekhnika. 2024. V. 88. № 4. P. 111−120. DOI: https://doi.org/10.18127/j00338486-202404-11 (In Russian)

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