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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Print: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v73.i1.60
pages 73-81

Q-FACTOR AND EXCITATION EFFICIENCY OF LAMINAR QUASI-OPTICAL DIELECTRIC RESONATORS

A. Ya. Kirichenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
G. V. Golubnichaya
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
I. G. Maximchuk
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine
V. B. Yurchenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine

ABSTRACT

In spite of widely studied electrodynamic properties of dielectric resonators, nowadays there is no information on Q-factors of laminar resonators, a kind of quasioptical dielectric resonators assembled as a set of coaxial disk laminae with certain inter-lamina spacings. The lack of the data prevents us from using the resonators for measuring electric characteristics of surrounding substances which, due to the resonator design, have an enhanced coupling to the resonator. Current research is aimed at filling this gap in our knowledge. Difficulties in theoretical calculation of Q-factors of laminar resonators caused by their complicated shape force us to prefer experimental methods in our research. In this work, Q-factors and excitation efficiency of laminar resonators are measured for the first time as functions of the number of laminae in use and of inter-lamina spacings. A minimum number of laminae needed for the excitation and an optimal spacing for supplying a maximum Q-factor have been found. The research has been carried out for resonators of large azimuthal index (n ~ 50 for the fused quartz disks) and of lower one (n < 20 for the alumina disks). It is shown that in both cases Q-factors of laminar resonators are about ten times lower if compared to the ordinary disk resonators of the same size and material, which remain uniform in the axial direction and do not contain inter-lamina spacings.