Hemispherical and aspheric wgm dielectric resonators with conducting endplates: radiation and conductivity losses depending on shape of the resonators surface

• Дата: 2013
• Автори: Barannik, A.A., Cherpak, N.T., Kharchenko, M.S., Vitusevich, S.A.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут радіофізики і електроніки ім. А.Я. Усикова НАН України 2013
• Назва видання: Радіофізика та електроніка
• Теми: Микроволновая электродинамика
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/106008
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Hemispherical and aspheric wgm dielectric resonators with conducting endplates: radiation and conductivity losses depending on shape of the resonators surface / A.A. Barannik, N.T. Cherpak, M.S. Kharchenko, S.A. Vitusevich // Радіофізика та електроніка. — 2013. — Т. 4(18), № 4. — С. 49-54. — Бібліогр.: 10 назв. — англ.

The aim of the work is to study the radiation and conductivity losses in whispering gallery mode (WGM) resonators of different shape of the body of rotation. In this work, electromagnetic properties of a number of WGM resonators with conducting endplates are studied. Losses are studied in Ka-band for two kinds of dielectric material, namely, isotropic (Teflon) and anisotropic (single-crystal sapphire). For the Teflon hemispherical resonator, the analytical approach is used and its results are compared with the results of experimental measurements. The resonators of other shapes are studied experimentally. Experiments show that aspheric sapphire resonator has maximum coefficient As. however the radiation Q-factor is larger in the hybrid sapphire resonator (aspheric+cylindrical disk). Thus, the hybrid resonator with As 25 % greater than As of the hemispherical resonator with approximately the same radiation loss is a better option for the (super)conductor measurement purpose in microwave range.