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ISSN 2415-3400 (Online)
ISSN 1028-821X (Print)

A resonant short-circuit plunger as part of tunable waveguide-dielectric and waveguide-coaxial resonators built around cylindrical evanescent waveguides

Skuratovskiy, IG, Khazov, OI, Shakhova, AS
Organization: 

O.Ya. Usikov Institute for Radiophysics and Electronics of NAS of Ukraine
12, Akad. Proskury St., Kharkov, 61085, Ukraine
Е-mail: briz@ire.kharkov.ua

https://doi.org/10.15407/rej2021.02.046
Language: ukranian
Abstract: 

Subject and Purpose. Tunable resonant structures make numerous microwave devices, among which are waveguide-dielectric and waveguide-coaxial resonators (WDR and WCR) built around cylindrical evanescent waveguides and involving a resonant short-circuit (RSC) plunger for tuning purposes. The present paper seeks to study specific features of the RSC-plunger operation in the evanescent waveguide and estimate the RSC-plunger efficiency.

Method and Methodology. The RSC-plunger efficiency is approximately estimated in terms of the transmission line theory. Comparative experimental verification of the Q-factor increase is provided by an example of a 3 cm WDR resonator equipped with a RSC-plunger.

Results. It has been shown that relevant formulae of the transmission line theory can be extended for the RSC-plunger efficiency estimation on the TEM and H11 oscillations. A possibility has been studied of the TEM type transformation to the H11 oscillation and back when the spurious resonance of the RSC-plunger falls within the WDR (WCR) tuning range. 

Conclusion. Insignificance of the effect that small deviations from the numerically predicted dimensions of the RSC-plunger exert on the RSC-plunger operation efficiency has been demonstrated. The RSC-plunger efficiency and a possibility to remove the spurious resonances from the resonator tuning range have been experimentally confirmed.

Keywords: evanescent waveguide, Q-factor, resonant frequency, short-circuit plunger, waveguide-coaxial resonator, waveguide-dielectric resonator

Manuscript submitted 28.12.2020
Radiofiz. elektron. 2021, 26(2): 46-53
Full text (PDF)

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