Journal of Radio Electronics. eISSN 1684-1719. 2024. ¹7
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2024.7.8
MICROWAVE STRIPLINE RESONATOR WITH BULK CRYSTAL:
EXPERIMENTAL CHARACTERISTICS AND DETERMINATION
OF EFFECTIVE DIELECTRIC PERMITTIVITY
A.A. Arutyunyan, N.D. Malyutin
Tomsk State University of Control Systems and Radio Electronics (TUSUR)
634050, Tomsk, Lenin Ave., 40
The paper was received April 25, 2024.
Abstract. The paper presents the results of an experimental study and modeling of the frequency characteristics of a resonator in the form of two strip vibrators, separated by a large gap and covered with a bulk lithium niobate crystal. A metal electrode with a floating potential is installed on the upper surface of the crystal. The frequency dependences of the scattering matrix coefficients of a stripline resonator were measured in the frequency range up to 3 GHz. Electrodynamic analysis was carried out in the COMSOL Multiphysics numerical simulation environment. A comparison was made of experimental and numerical results, which showed good qualitative agreement between the transmission coefficients and reflection coefficients. Resonant oscillations were obtained at two or three frequencies depending on the location and orientation of the crystal. It has been established that at the first resonant frequency the electrode acts as a screen. The absence of an electrode leads to the disappearance of resonance. The simulation carried out in COMSOL made it possible to estimate the effective dielectric constant of the resonator corresponding to the values of the resonant frequencies. The calculation of electromagnetic fields made it possible to establish the types of waves corresponding to resonant frequencies. Knowing the type of waves and estimating the relative dielectric constant made it possible to construct an algorithm for a refined iterative procedure for calculating the values of the resonant frequencies and the effective dielectric constant of the resonator. The possibility of using resonators as single-link bandpass filters with a passband of about 1%, insertion loss of –1.1 dB and minimal return loss of –28 dB at the center frequency is shown.
Key words: resonator, strip lines, bulk crystal, lithium niobate, frequency characteristics, band-pass filter, experimental characteristics, modeling.
Financing: The work was carried out with financial support from the Ministry of Science and Higher Education of the Russian Federation within the framework of project No. FEWM-2023-0014 dated 01/16/23.
Corresponding author: Arutyunyan Artush Arsenovich, arutyunyan18@mail.ru
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For citation:
Arutyunyan A.A., Malyutin N.D. Microwave stripline resonator with bulk crystal: experimental characteristics and determination of effective dielectric permittivity // Journal of Radioelectronics. – 2024. ¹. 7. https://doi.org/10.30898/1684-1719.2024.7.8 (In Russian)