Open Access Open Access  Restricted Access Subscription Access
Disk DR made of a low-loss isotropic material under investigation

Increasing Q-factor of planar dielectric resonators with whisper gallery modes

Alexander E. Kogut, E. A. Kogut, R. S. Dolya, Sergey O. Nosatiuk, S. N. Kharkovsky, Jaochang He


Planar dielectric resonators (DR) with height significantly lower than the operating wavelength are investigated as a new class of disk dielectric resonators of the millimeter wavelength range with whispering gallery (WG) modes. It is known that in the open state, such resonators based on the WG modes are not excited due to high radiation losses. It is shown that the solution of this problem is the partial shielding of the disk dielectric structures with a plane-parallel screen by placing the disk between two flat conducting mirrors. It has been established that by introducing an air gap between the flat base of the dielectric disk and one of the conductive mirrors, it is possible to increase the quality factor of the planar DR almost twice. One of the reasons for this is the partial displacement of the resonant field of the WG modes from the dielectric region to the air gap, where the dielectric losses are lower. In addition, an increase in the air gap in the range of optimal values, comparable to half the working wavelength, leads to a decrease in ohmic losses. The above causes an increase in the quality factor of planar DR as an air gap is extended.


planar dielectric resonator; whispering gallery vibrations; electromagnetic characteristics; enhanced quality factor

Full Text:



ANNINO, G.; CASSETTARI, M.; MARTINELLI, M. “Study on planar whispering gallery dielectric resonators. I. General properties,” Int. J. Infrared Millimeter Waves, v.23, n.4, p.597-615, 2002. DOI:

SANTHOSH KUMAR, G.D.V.; JAMES RAJU, K.C. “Whispering gallery modes of planar dielectric resonators in LTCC technology,” Proc. of Int. Conf. on Microelectronics, Communications and Renewable Energy, 4-6 June 2013, Kanjirapally, India. IEEE, 2013, p.474-479. DOI:

NOR, Nuramirah Mohd; JAMALUDDIN, Mohd Haizal; KAMARUDIN, Muhammad Ramlee; AMBIA, Siti Zareen Naqiyah Zool. “Design of planar dielectric resonator antenna array at 28 GHz,” Indonesian J. Electrical Engineering Computer Science, v.5, n.3, p.622-627, 2017. DOI:

ILCHENKO, M.E.; VZYATYSHEV, V.F.; GASANOV, L.G.; et al. Dielectric Resonators [in Russian, ed. by M. E. Ilchenko]. Moscow: Radio i Svyaz’, 1989.

KIRICHENKO, A.Ya.; PROKOPENKO, Yu.V.; FILIPPOV, Yu.F.; CHERPAK, N.T. Quasi-Optical Solid-State Resonators [in Russian]. Kyiv: Naukova Dumka, 2008.

YURCHENKO, V.B.; ALTINTAS, A.; CIYDEM, M.; KOC, S. “Experimental conditions for the excitation of thin disk whispering-gallery-mode resonators,” PIER C, v.43, p.29-40, 2013. DOI:

GOLUBNICHAYA, G.V.; KIRICHENKO, A.Ya.; KRIVENKO, E.V.; LUTSENKO, V.I. “The effect of gap width between disks on the Q value of a laminar dielectric disk resonator,” Tech. Phys. Lett., v.41, n.3, p.281, 2015. DOI:

KIRICHENKO, A.Ya.; GOLUBNICHAYA, G.V.; MAXIMCHUK, I.G.; YURCHENKO, V.B. “Q-factor and excitation efficiency of laminar quasi-optical dielectric resonators,” Telecom. Radio Eng., v.73, n.1, p.73-81, 2014. DOI:

KOGUT, A.E.; DOLIA, R.S.; NOSATIUK, S.O.; SHULGA, Ye.A.; HE, Jaochan. “Excitation of whispering gallery modes in a disk planar dielectric resonator by a coupling slot,” Proc. National Academy Sciences Belarus. Physical-Tech. Ser., n.3, p.121-128, 2017. URI:

IVANOV, E.N.; KARACHEV, A.A.; TSARAPKIN, D.P. “Increasing the excitation efficiency of disk dielectric resonators,” Radioelectron. Commun. Syst., v.30, n.10, p.68, 1987.

GINZTON, E.L. Microwave Measurements. New York: McGraw-Hill, 1957.

SKRIPKA, S.L.; DANILOV, V.V.; PAVLOVSKY, I.S. “Planar structures of waveguiding surcuitry for millimeter band,” Telecom. Radio Eng., v.71, n.15, p.1411, 2012. DOI:

KOGUT, A.E.; NOSATYUK, S.O.; SOLODOVNIK, V.; DOLIA, R.S. “Implementation of higher order forced oscillations mode in shielded dielectric resonators by using slotline,” Radioelectron. Commun. Syst., v.57, n.10, p.451-456, 2014. DOI:

KOGUT, A.E.; DOLYA, R.S.; NOSATYUK, S.O.; HE, Jaochan. “Whispering gallery mode excitation in the shielded dielectric resonator using a slot line,” Telecom. Radio Eng., v.75, n.2, p.95, 2015. DOI:

KOGUT, A.E.; KUTUZOV, V.V.; SOLODOVNIK, V.A.; KHARKOVSKY, S.N. “On possibility of rarefaction of the spectrum of forced oscillations like a whispering gallery in cylindrical dielectric resonator,” Radiofiz. Electron., v.6, n.2-3, p.218-221, 2001.

© Radioelectronics and Communications Systems, 2004–2018
When you copy an active link to the material is required
ISSN 1934-8061 (Online), ISSN 0735-2727 (Print)
tel./fax +38044 204-82-31, 204-90-41