Measurement of Dielectric Material Properties Using Coupled Biconical Resonators

Andreev, M.; Drobakhin, O. O.; Privalov, Ye. N.; Saltykov, D. Yu.

doi:10.1615/telecomradeng.v73.i11.70

Cited by 21 publications

(4 citation statements)

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“…For all series of the experiment, the condition Рout/Seff = 1.1 10 -3 W/cm 2 was satisfied. In principle, to enhance the effect of the electromagnetic field, the object could be placed in a resonator with holes (biconical resonator) to ensure breathing, but then the irradiation conditions would not correspond to those observed in practice (Andreev et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

The influence of microwave electromagnetic radiation on rat heart morphogenesis during thyroidectomy

Drobakhin

Magro

Кошарный

et al. 2021

Regul. Mech. Biosyst.

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It is known that electromagnetic radiation affects the functional systems of living beings, in particular, the endocrine and cardiovascular systems and directly the heart cells and their functioning. In this case, the influence of electromagnetic radiation significantly affects the properties of the cardiovascular system and changes physiological processes in it. Moreover, sensitivity to signals is higher for biosystems with a higher level of organization. The method of simulating hypothyroidism for rats makes it possible to develop an experimental model for analyzing morphogenetic changes in the rat heart. Under conditions of hypothyroidism modeling, destructive changes in muscle fibers are observed in the myocardium after thyroidectomy, but after microwave irradiation with an exposure of 45 minutes, a regenerative-compensatory reconstruction of the structural components of the myocardium of the heart wall occurs. After thyroidectomy and microwave irradiation with an exposure of 120 minutes, an increase in degenerative and destructive processes in the heart myocardium was observed. For the first time, a comparative ultramicroscopic study using electron microscopy was carried out. It showed that after electromagnetic irradiation with an exposure of 45 minutes, the general structure of the mitochondrial apparatus does not change. Irradiation with an exposure of 120 minutes causes the destruction of subsarcolemal and paranuclear organelles, edema and degradation of intermyofibrillar mitochondria. After exposure to electromagnetic radiation with the exposure of 45 minutes in a hypothyroid state, a compensatory restructuring of the energy apparatus of the contractile cardiomyocytes of the left ventricle occurs due to the formation of mitochondria and an increase in their contact interaction. After exposure to radiation for 120 minutes, the development of destructive-degenerative processes in the mitochondrial apparatus of left ventricular cardiomyocytes, deepening of damage to intermitochondrial contacts was observed. The most significant increase in the relative volume of the endothelium in the areas of the rat heart myocardium was observed for the case of microwave irradiation only (without experimental hypothyroidism) with exposure duration of 45 minutes. Immunohistochemical study both for the case of microwave irradiation only and for the case of microwave irradiation under conditions of experimental hypothyroidism allows us to conclude that morphogenetic transformations are highly active in the myocardium of the heart when the duration of exposure is 45 minutes. This study will make it possible to develop recommendations for persons with thyroid diseases on the duration of daily exposure of staying in electromagnetic field emitted by devices with characteristics similar to the case under study.

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Section: Methodsmentioning

confidence: 99%

The influence of microwave electromagnetic radiation on rat heart morphogenesis during thyroidectomy

Drobakhin

Magro

Кошарный

et al. 2021

Regul. Mech. Biosyst.

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“…There is a lot of papers devoted to the study of dielectric parameters using single and coupled biconical resonators, for example [7]. Fig.…”

Section: Measurement Methodsmentioning

confidence: 99%

Measurement of the dielectric properties of paratellurite at microwaves using a biconical resonator

2020

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The results of measurements of the dielectric parameters of TeO2 samples in the microwave range are presented. The measurements were carried out in X-band by the cavity perturbation method using a measuring setup based on a biconical resonator. The advantages of using a high-Q biconical resonator for measuring the dielectric parameters of a paratellurite sample are considered. The determination of the dielectric parameters of the samples is based on finite element computational model and using digital method for determining the natural frequency by fractional rational approximation of the frequency response. The influence of the deviation of the sample shape from the cylindrical on the resonator parameters and the measurement error is considered. The estimate of the dielectric constant of TeO2 in the crystallographic direction [110] was 24.4, the dielectric loss factor such as tanδ is estimated as 3·10-4. The results obtained are in good agreement with the reference results presented in the scientific literature.

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“…An increase in the size of the holes leads to an increase in the transmission coefficient and the degree of distortion of the electric field structure, as well as to a decrease in the resonant frequency and loaded Q-factor of biconical resonators. Such a combination of the diameters of the open ends of the biconical resonator and the diameter of the coupling holes is possible, in which its resonant frequency and loaded Q-factor will differ insignificantly from the same parameters for a resonator without holes [9]. When the diameter of the open end of the resonator reaches certain limit values, which can be characterized by the value of half the diameter of the base of the conical components of the resonator, the Q-factor of the resonator is significantly reduced, and its practical use loses its meaning.…”

Section: Circuit and Measurement Equipmentmentioning

confidence: 99%

Permittivity measurement of nanocrystals ZnO:Mn at microwaves with using a biconical сavity

Drobakhin,

Kovalenko,

Saltykov

et al. 2023

J. Phys. Electron.

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The measurement of the dielectric constant of nanocrystalline materials at microwave frequencies using a biconical resonator is under consideration. Obtaining ZnO and ZnO:Mn (2%) nanocrystals is carried out under non-equilibrium conditions by the method of ultrasonic aerosol pyrolysis. Estimates of the dielectric constant of these samples in the range of 8–12 GHz were obtained. Dielectric constant estimates are 8,3±0,2 and 12,4±0,2, respectively.

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Measurement of Dielectric Material Properties Using Coupled Biconical Resonators

Cited by 21 publications

References 0 publications

The influence of microwave electromagnetic radiation on rat heart morphogenesis during thyroidectomy

The influence of microwave electromagnetic radiation on rat heart morphogenesis during thyroidectomy

Measurement of the dielectric properties of paratellurite at microwaves using a biconical resonator

Permittivity measurement of nanocrystals ZnO:Mn at microwaves with using a biconical сavity

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