Increasing the Q-factor of thin planar dielectric resonator with whispering gallery modes

AbstractThe spectral and energy characteristics of the tunable thin planar dielectric resonator with the movable metal mirror are researched. It is found that the high-Q HE-polarized whispering gallery modes (WGMs) are effectively excited in such a resonator by the dielectric waveguide. A mode set of the tunable thin planar dielectric resonator depends on the presence of an air gap in its design. Changing the height of the air gap affects the energy characteristics of the tunable thin planar dielectric resonators (DR). Shifting the resonant fields of WGMs from the dielectric disk to the air gap is the reason for this effect. It is shown that at certain heights of the air gap, increasing the unloaded Q-factor of the tunable thin planar DR and improving the excitation efficiency of WGMs in it is achieved.

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Excitation of the high Q-factor whispering-gallery modes in the hemiball shielded dielectric resonator by the “slot-line”

2014 24th International Crimean Conference Microwave & Telecommunication Technology ◽

10.1109/crmico.2014.6959552 ◽

2014 ◽

Author(s):

A. E. Kogut ◽

S. O. Nosatyuk ◽

V. A. Solodovnik ◽

R. S. Dolya

Keyword(s):

Dielectric Resonator ◽

Whispering Gallery Modes ◽

Q Factor ◽

High Q ◽

Whispering Gallery ◽

Slot Line

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Excitation of the high-Q-factor whispering gallery modes in the hemispherical dielectric resonator with the cylinder shield

1999 9th International Crimean Microwave Conference 'Microwave and Telecommunication Technology'. Conference Proceedings (IEEE Cat. No.99EX363) ◽

10.1109/crmico.1999.815236 ◽

1999 ◽

Author(s):

V.V. Kutuzov ◽

S.N. Kharkovsky ◽

A.E. Kogut

Keyword(s):

Dielectric Resonator ◽

Whispering Gallery Modes ◽

Q Factor ◽

High Q ◽

Whispering Gallery

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A shielded planar dielectric resonator with whispering gallery modes

Proceedings of the National Academy of Sciences of Belarus Physical-Technical Series ◽

10.29235/1561-8358-2018-63-4-478-485 ◽

2019 ◽

Vol 63 (4) ◽

pp. 478-485

Author(s):

A. Ye. Kogut ◽

I. K. Kuzmichev ◽

R. S. Dolia ◽

S. O. Nosatiuk ◽

Ye. A. Shulha ◽

...

Keyword(s):

Computer Simulation ◽

Dielectric Material ◽

Whispering Gallery Modes ◽

Homogeneous Distribution ◽

Q Factor ◽

Curvilinear Surface ◽

Resonant Field ◽

Whispering Gallery ◽

Metal Shield ◽

Dielectric Disk

The spectral and energy characteristics of two planar dielectric resonators (DRs), open and shielded from the curvilinear surface, excited in higher-order modes as whispering gallery modes (WGMs) in Ka-waveband are investigated. These resonators are formed by a thin (compared to the operating wavelength) disk dielectric structure, located between two conducting planes. Thus, the E-field of the resonator was limited along the height of the planar disk by two conducting surfaces. The resonance properties of such a structure are determined by the condition of total internal reflection of waves from the internal curvilinear surface of a dielectric disk. The carried out investigations shown that the unloaded Q-factor is increased at the arrangement of planar dielectric disk inside the ring metal shield at the certain ratio of the radiuses of the shield and dielectric disk. The Q-factor of the shielded resonant structure at the high-frequency edge increases to 40 %. The partial displacement of the resonant field of the WGMs modes from the dielectric to the air gap is the cause of this effect. It leads to decrease in losses in the dielectric material. A computer simulation of the WGMs fields in the planar DR was carried out using the CST Microwave Studio 2013 software to confirm this effect. In addition, computer simulation results shown that these WGMs in the planar DR are characterized by a homogeneous distribution of the resonant field along the axial coordinate. The perspectives of using planar DR in solid-state Ka-band oscillators are shown.

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