Yu. F. Filippov
National Academy of Sciences of Ukraine
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Featured researches published by Yu. F. Filippov.
Technical Physics | 2004
Yu. V. Prokopenko; T.A. Smirnova; Yu. F. Filippov
Quasi-TE and quasi-TM oscillations of an anisotropic spherical body immersed in an isotropic medium are studied. An investigation of the set of Maxwell’s equations within the spherical body shows that it reduces to two coupled differential equations, which are analyzed theoretically for small values of the anisotropy parameter. An approximate solution to these differential equations is obtained. A dispersion relation determining the frequencies of the resonant oscillations is derived for the boundary conditions imposed on the surface of the spherical body. The effect of anisotropy on the spectral characteristics of the resonant oscillations is examined.
Radioelectronics and Communications Systems | 2009
Yu. V. Prokopenko; O. A. Suvorova; Yu. F. Filippov; I. A. Shipilova
Natural oscillations of radially three-layered dielectric resonators have been investigated. The latter have the form of a sphere and cylinder limited by ideally conducting end planes. The expressions for components of electromagnetic fields of natural oscillations and characteristic equations of resonators were obtained. Numerical investigations of resonators were carried out in the 8-millimeter wavelength band. The impact of the middle layer parameters of resonators on their spectral and power characteristics was also analyzed. It was proposed to use such resonators for extracting the complex dielectric permittivity of substances.
Technical Physics Letters | 2007
Yu. V. Prokopenko; Yu. F. Filippov; I. A. Shipilova
A semicylindrical dielectric resonator with a thin cylindrical inhomogeneity in the region of the field antinode of a whispering gallery eigenmode has been studied. Characteristic equations determining the complex eigenfrequencies of such resonators with axially homogeneous eigenmodes are obtained. It is shown that the presence of a dielectric or conducting inhomogeneity leads to a frequency shift and causes additional energy losses of the eigenmode.
Technical Physics Letters | 2006
Yu. V. Prokopenko; Yu. F. Filippov; I. A. Shipilova
The influence of a ring layer filled with various substances on the eigenfrequency and Q-factor of a cylindrical quasi-optical dielectric (Teflon) resonator has been investigated. The spectral and energy characteristics of an axially homogeneous whispering gallery eigenmode of this resonator are analyzed for the first time as dependent on the radius and thickness of the ring layer. It is established that the eigenfrequency behaves differently when the ring layer is filled with liquids characterized by large and small losses.
Technical Physics | 2005
Yu. V. Prokopenko; Yu. F. Filippov; V. M. Yakovenko
Forced oscillations excited by a radial magnetic dipole in a dielectric hemisphere (resonator) placed on a perfectly conducting plane are studied. It is shown that the dipole excites H modes. When the dipole radiation frequency equals the eigenfrequency of the resonator, an amplitude resonance is observed in the spectrum. The excitation efficiency is high when the magnetic dipole is placed at the maximum of the radial field component of the resonator’s eigenmode.
Technical Physics | 2004
A. E. Kogut; Z. E. Eremenko; Yu. F. Filippov; V. V. Kutuzov
It is found that, when the shape of a dielectric sphere (hemisphere) operating under the whispering gallery mode conditions is perturbed by a surface curvature gradient (ellipticity), the unloaded Q factor of the sphere degrades and its resonance frequencies change. It is shown theoretically and experimentally that an elliptic irregularity removes frequency degeneracy of whispering gallery modes at millimeter waves.
Technical Physics Letters | 2003
A. A. Barannik; Yu. V. Prokopenko; Yu. F. Filippov; N. T. Cherpak
We have studied the influence of finite dimensions of the end screens on the spectrum of whispering gallery modes in a teflon cylindrical quasioptical resonator. The dependence of the resonance oscillation frequency on the radius of conducting end screens is determined for the first time. Variation of the screen radius leads to transformation of the axial index of HE modes.
Technical Physics Letters | 1999
S. N. Khar’kovskii; Yu. F. Filippov; Z. E. Eremenko; A. E. Kogut; V. V. Kutuzov
Results are presented of theoretical and experimental investigations of whispering-gallery oscillations in a shielded isotropic layered spherical dielectric cavity. Oscillations whose Q factor is two orders of magnitude higher than that of the oscillations of an open dielectric sphere are studied. Intermode interaction is observed between various cavity oscillation modes.
Technical Physics | 2000
Yu. F. Filippov; Z. E. Eremenko
The anisotropy of parameters is an intrinsic characteristic feature of dielectrics employed in production of high-Q resonators. A theory of azimuthal-homogeneous resonant oscillations in a single-crystal sphere is developed. It is demonstrated that the anisotropy gives rise to TM oscillations of two orders at different frequencies. Oscillations with large polar indices are numerically investigated.
International Journal of Infrared and Millimeter Waves | 2004
V.N. Derkach; Yu. F. Filippov; A.S. Plevako; Yu. V. Prokopenko; T.A. Smirnova