Patent RU-2739937-C1 (RU)
Title: Method for measuring intrinsic q-factor of dielectric resonator
Inventor: GEVORKYAN VLADIMIR MUSHEGOVICH
IPC: G01R27/06
Filed: 2020-07-28
Granted: 2020-12-29
Abstract: FIELD: metrology. 
     SUBSTANCE: invention relates to the metrology. Method of measuring intrinsic Q-factor of open dielectric resonator consists in measurement of proper Q-factor of volumetric metal resonator in form of parallelepiped with rectangular cross-section, electromagnetically connected to waveguide with rectangular cross-section, according to frequency dependence of resonance curve, in Q-factor measurement of frequency dependence of communication frequency curve of electromagnetic-coupled volumetric metal resonator and open dielectric resonator with lower H-type oscillation with resonance frequency equal to resonant frequency of volumetric metal resonator, which is located in volumetric metal resonator, and calculation of the measured Q-factor of the own Q-factor of the open dielectric resonator, the cross-section of the volumetric metal resonator is selected to be identical to the cross-section of the waveguide and with length equal to wave length λ in waveguide at resonant frequency of volumetric metal resonator, volumetric metal resonator is installed longitudinally on outer surface of wide wall of waveguide, and the open dielectric resonator is located at the magnetic field maximum point with electromagnetic oscillations of the form H 102 , where indices 1.0 and 2 are equal to the number of field strength variations, respectively, along transverse axes x, y and longitudinal axis z of the coordinate system, in the center of the cross-section and the longitudinal dimension of the volumetric metal resonator, enable to rotate the open dielectric resonator around one of the axes parallel to its generatrixes, and the Q-factor of the volumetric metal resonator is measured as per level of half-power "one-hump" curve of amplitude-frequency characteristic of waves in the rectangular waveguide, which is ensured by orientation of open dielectric resonator at its rotation through angle within ±10° around one of axes, define their own quality factor Q M0  bulk metal resonator by the known formula that takes into account the center frequency humped curve bandwidth "humped" curve at half power, coupling coefficient of volumetric metal resonator with waveguide with rectangular cross-section. Position of open dielectric resonator is changed in volumetric metal resonator and type of "double-humped curve" is indicated with equal within 1% levels of frequency dependence of reflection coefficients S 11  at communication frequencies ω 1  and ω 2 , Q-factor for amplitude-frequency curves is measured at communication frequencies using a known formula which takes into account the "double-hump" curve coupling frequency, communication bandwidth of each of the communication frequencies of the "double-hump" curve at the half-power level, communication coefficients at communication frequencies, calculated by the reflection coefficient level α 1 =α 2  waves in waveguide with rectangular section, and determining proper Q-factor Q 0  of open dielectric resonator. 
     EFFECT: increase in the measurements accuracy. 
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