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A magnetoactive metamaterial based on a structured ferrite 一种基于结构铁氧体的磁活性超材料
Pub Date : 2021-01-01 DOI: 10.15407/REJ2021.01.028
S. Polevoy, G. Kharchenko, S. Tarapov, O. Kravchuk, K. Kuršelis, B. Chichkov, N. Slipchenko
Subject and Purpose. The use of spatially structured ferromagnets is promising for designing materials with unique predetermined electromagnetic properties welcome to the development of magnetically controlled microwave and optical devices. The paper addresses the electromagnetic properties of structured ferrite samples of a different shape (spatial geometry) and is devoted to their research by the method of electron spin resonance (ESR). Methods and methodology. The research into magnetic properties of structured ferrite samples was performed by the ESR method. The measurements of transmission coefficient spectra were carried out inside a rectangular waveguide with an external magnetic field applied. Results. We have experimentally shown that over a range of external magnetic field strengths, the frequency of the ferromagnetic resonance (FMR) of grooved ferrite samples (groove type spatial geometry) increases with the groove depth. The FMR frequency depends also on the groove orientation relative to the long side of the sample. We have shown that as the external static magnetic field approaches the saturation field of the ferrite, the FMR frequency dependence on the external static magnetic field demonstrates "jump-like" behavior. And as the magnetic field exceeds the ferrite saturation field, the FMR frequency dependence on the groove depth gets a monotonic character and rises with the further growth of the field strength. Conclusion. We have shown that the use of structured ferrites as microwave electronics components becomes reasonable at magnetic field strengths exceeding the saturation field of the ferrite. At these fields, such a ferrite offers a monotonically increasing dependence of the resonant frequency on the external magnetic field and on the depth of grooves on the ferrite surface. Structured ferrites are promising in the microwave range as components of controlled filters, polarizers, anisotropic ferrite resonators since they can provide predetermined effective permeability and anisotropy
主题和目的。利用空间结构的铁磁体设计具有独特预定电磁特性的材料是有希望的,这对磁控微波和光学器件的发展是有欢迎的。本文讨论了不同形状(空间几何)结构铁氧体样品的电磁特性,并利用电子自旋共振(ESR)方法对其进行了研究。方法和方法论。采用ESR法对结构铁氧体样品的磁性能进行了研究。透射系数光谱的测量在外加磁场作用下的矩形波导内进行。结果。我们的实验表明,在一定的外磁场强度范围内,沟槽铁氧体样品(沟槽型空间几何)的铁磁共振频率(FMR)随着沟槽深度的增加而增加。FMR频率还取决于相对于样品长边的凹槽方向。我们已经证明,当外部静态磁场接近铁氧体的饱和场时,FMR频率对外部静态磁场的依赖表现出“跳变”行为。当磁场超过铁氧体饱和场时,FMR频率对沟槽深度的依赖呈现单调特征,并随着磁场强度的进一步增大而增大。结论。我们已经证明,当磁场强度超过铁氧体的饱和场时,使用结构铁氧体作为微波电子元件是合理的。在这些磁场下,这种铁氧体的谐振频率随外加磁场和铁氧体表面凹槽深度的变化呈单调递增的趋势。结构铁氧体可以提供预定的有效磁导率和各向异性,在微波范围内作为可控滤波器、极化器、各向异性铁氧体谐振器的组成部分是有前途的
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引用次数: 0
On kinetics of superconducting state destruction in a nonlinear coplanar waveguide based on a high-temperature superconductor film 基于高温超导薄膜的非线性共面波导超导态破坏动力学研究
Pub Date : 2021-01-01 DOI: 10.15407/REJ2021.01.049
O. Lavrinovich, N. Cherpak
Subject and Purpose. The mechanism of destruction of the S-state of a nonlinear high-temperature superconductor as part of a coplanar waveguide has not been properly elucidated as the effect of avalanche-type transition to a highly dissipative state, which was experimentally detected by the authors, takes place. The present work is concerned with the development of an appropriate approach describing kinetics of destruction of the S-state of a nonlinear high-temperature superconductor in a coplanar waveguide with allowances made for an inhomogeneous distribution of the microwave current in the superconducting film strip. Methods and Methodology. Use of I.B. and O.G. Vendiks’ reasoning [2] is made on kinetics of the destruction of the superconducting state of a wide film when a direct current governed by the time-dependent Ginzburg-Landau equation is applied. Keeping unchanged their idea as to the S–N boundary forming in the film strip with the boundary movement to the middle of the strip, the S–N boundary motion equation is obtained for a coplanar waveguide, proceeding in doing this from the motion equation of magnetic flux vortices under certain restrictions specified. Results. The time of S-state destruction has been numerically estimated: 1) for a wide superconducting film of YBa2Cu3O7–d composition, the destruction is by the direct current and 2) for a coplanar waveguide based on the same film, the destruction is by the microwave current. When the superconductivity is small (I / I c ³ 1), the destruction time values in both cases are close to each other within the order of magnitude. Conclusion. It is for the first time that the S-state destruction time in a coplanar waveguide has been expressed in terms of the microwave current distribution in the waveguide. It has been shown that this characteristic linearly depends on the ratio between the critical current and the microwave current amplitude in contrast to a quadratic dependence obtained for a superconducting strip with a direct current.
主题和目的。作为共面波导的一部分,非线性高温超导体s态的破坏机制尚未得到适当的阐明,因为作者在实验中检测到了雪崩型跃迁到高耗散态的影响。目前的工作是发展一种适当的方法来描述共面波导中非线性高温超导体s态的破坏动力学,并考虑到超导薄膜带中微波电流的不均匀分布。方法和方法论。利用I.B.和O.G. Vendiks的推理[2],研究了受时变金兹堡-朗道方程支配的直流电对宽膜超导态破坏的动力学。保持他们在薄膜带中沿边界向中间移动形成S-N边界的思想不变,从给定一定限制条件下磁通涡旋的运动方程出发,得到共面波导的S-N边界运动方程。结果。数值计算了s态破坏的时间:1)对于YBa2Cu3O7-d组成的宽超导薄膜,s态破坏是由直流电破坏的;2)对于基于相同薄膜的共面波导,s态破坏是由微波电流破坏的。当超导性较小时(I / I c³1),两种情况下的破坏时间值在数量级内接近。结论。本文首次用微波电流在共面波导中的分布来表示共面波导中的s态破坏时间。结果表明,该特性线性依赖于临界电流与微波电流幅值之间的比值,而非直流超导带的二次依赖关系。
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引用次数: 0
Peculiarities of wheat seed resonant exposure to microwave radiation through oxygen-enriched water 小麦种子通过富氧水辐照微波辐射的共振特性
Pub Date : 2021-01-01 DOI: 10.15407/rej2021.03.038
O. Kovalenko, F. Kivva, A. Roenko
Subject and Purpose. Peculiarities are considered of a purposeful modification of the functional indices of wheat seeds upon their soaking in water preliminarily enriched with oxygen and simultaneously irradiated with a low-intensity electromagnetic field (EMF). The aim is to investigate effectiveness of such an indirect exposure of wheat seeds to a low-intensity electromagnetic field related to discrete bands in the extremely high-frequency (EHF) range and depending on the initial state of seeds, “norm” or “pathology”. Methods and methodology. The study comprises experimentally approved radio-physical, radio-engineering and chemical methods. Generators G4-141 (37.5…53.57 GHz) and G4-142 (53.57…78.33 GHz) serve as radiation sources. Oxygen is obtained by reacting a hydrogen peroxide solution with potassium permanganate. The oxygen enrichment of water is executed during its irradiation. The verification of indirect electromagnetic field exposure is based on changes demonstrated by such functional indices of seeds as germination energy and mean lengths of roots and seedlings in each sample. Results. A possibility has been established to modify the functional indices of wheat seeds through their soaking in water preliminarily irradiated with an EMF and simultaneously enriched with oxygen. It has been revealed that the efficiency of the effect depends on whether the seeds are in “normal” or “pathological” state and that a feasibility exists of recovering properties lost in a “pathology” state. The role that the oxygen in the water imbibing the seeds plays in the germination process has been demonstrated. Peculiarities as to the efficiency of wheat seed EMF exposure through the oxygen-enriched water have been shown depending on the signal frequency and length of exposure and on the total energy load. Conclusion. It has been found that substances, including living entities, can be electromagnetically exposed through water. The water-dissipative model of substance exposure to the electromagnetic field has been validated. In this model, water is one of the targets liable to changing its properties at the EMF exposure. This point has been indirectly confirmed by the studies of the states of seeds upon their soaking in the pre-irradiated water. The gas model of the EMF interaction with a substance has been verified, too. A possibility of oxygen activation at resonance irradiation has been shown.
主题和目的。本文认为小麦种子浸泡在初步富氧的水中,同时用低强度电磁场(EMF)照射后,其功能指标发生了有目的的变化。目的是调查小麦种子间接暴露于与极高频(EHF)范围内的离散波段有关的低强度电磁场的有效性,该电磁场取决于种子的初始状态,“正常”或“病理”。方法和方法论。这项研究包括经实验认可的无线电物理、无线电工程和化学方法。发生器G4-141(37.5…53.57 GHz)和G4-142(53.57…78.33 GHz)作为辐射源。氧是由过氧化氢溶液与高锰酸钾反应而得的。水的富氧是在辐照过程中进行的。间接电磁场暴露的验证是基于种子在每个样品中的发芽能和根苗平均长度等功能指标所显示的变化。结果。建立了小麦种子在电磁场初步照射并同时富氧的水中浸泡来改变其功能指标的可能性。研究表明,这种效果的有效性取决于种子处于“正常”还是“病理”状态,并且存在恢复在“病理”状态下失去的特性的可行性。已经证明了吸收种子的水中的氧在发芽过程中所起的作用。小麦种子EMF通过富氧水暴露的效率的特殊性已被证明取决于信号频率和暴露的长度以及总能量负荷。结论。人们已经发现,包括生物在内的物质可以通过水通过电磁暴露。验证了物质在电磁场作用下的水耗散模型。在这个模型中,水是易受电磁场影响而改变其特性的目标之一。对种子浸泡在预辐照水中的状态的研究间接证实了这一点。电磁场与物质相互作用的气体模型也得到了验证。在共振辐照下氧活化的可能性已被证明。
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引用次数: 0
A low temperature study of electromagnetic energy loss in low-loss materials in the 110…140 MHz frequency range 110 ~ 140 MHz频率范围内低损耗材料电磁能量损耗的低温研究
Pub Date : 2020-09-01 DOI: 10.15407/rej2020.03.042
V. Derkach, E. Alekseev, R. Golovashchenko, Y. Ostryzhnyi, A. Meshcheryakov, S. Tarapov
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引用次数: 1
Determination of surface parameters for backscattering simulation in the millimeter and centimeter wave regions 毫米波和毫米波区域后向散射模拟表面参数的确定
Pub Date : 2020-09-01 DOI: 10.15407/rej2020.03.034
A. Bukin, V. Gutnik, Y. Lohvinov, N. Reznichenko
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引用次数: 0
Green's function of a pulse sound source in a uniform subsonic flow 均匀亚音速流中脉冲声源的格林函数
Pub Date : 2020-09-01 DOI: 10.15407/rej2020.03.026
A. Bryukhovetski, A. Vichkan'
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引用次数: 1
Resonant properties of an impedance monopole located on a perfectly conducting rectangular screen 完全导电矩形屏蔽上阻抗单极子的谐振特性
Pub Date : 2020-09-01 DOI: 10.15407/rej2020.03.003
N. Yeliseyeva, S. Berdnik, V. Katrich
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引用次数: 0
Electromagnetic wave diffraction on a “strip grating – ferromagnetic half-space” composite structure: surface-wave resonances “条形光栅-铁磁半空间”复合结构的电磁波衍射:表面波共振
Pub Date : 2020-03-01 DOI: 10.15407/rej2020.01.011
A. Brovenko, P. Melezhik, A. Poyedinchuk, A. S. Troschylo
Subject and Purpose. A theoretic study is given to the diff raction of a monochromatic plane E -polarized electromagnetic wave on a composite structure like a periodic strip grating bordering a half-space fi lled with a lossy homogeneous gyrotropic ferromagnetic medium. The work seeks to develop a method of the diff raction problem solution and determine diff raction characteristics of the electromagnetic wave interaction with the composite structure in the frequency region where the eff ective permeability of the ferromagnetic medium takes negative values. Methods and Methodology. The method of the diff raction problem solution is based on the analytical regularization idea. The initial diff raction problem in terms of Maxwell’s equations is equivalently reduced to the Riemann problem in theory of analytical functions. The problem is explicitly solved to yield an infi nite system of linear algebraic equations for the Fourier coeffi cients of the diff raction fi eld expansion in plane (Floquet) modes, which is solved by truncation. Results. A solution method has been developed for the diff raction problem of plane waves on a periodic strip grating bordering a ferromagnetic half-space. A theoretic prediction has been made that the E -polarized plane wave refl ection coeffi cient of the ferromagnetic half-space bordered by a strip grating has resonances in the frequency region where the medium permeability takes negative values. It has been found that these resonances are mainly caused by the repeated refl ection of the surface wave of the ferromagnetic half-space from the grating strip edges. Conclusion. The developed solution method for the plane electromagnetic wave diff raction on a periodic strip grating lying on the medium interface can be generalized to the consideration of planar ferromagnetic layers instead of the ferromagnetic half-space. The theoretically predicted resonances of the refl ection coeffi cients can be essential to the synthesis of radar absorbing coatings.
主题和目的。本文从理论上研究了单色平面E偏振电磁波在周期条形光栅等复合结构上与半空间有损耗的均匀陀螺仪磁介质交界的衍射系数。在铁磁介质有效磁导率为负值的频率区域内,研究了电磁波与复合结构相互作用的衍射反应特性。方法和方法论。微分问题的求解方法是基于解析正则化思想的。麦克斯韦方程组的初始微分问题等效化为解析函数理论中的黎曼问题。对该问题进行了显式求解,得到了微分场在平面(Floquet)模式下展开的傅里叶系数的无穷线性代数方程组,该方程组采用截断法求解。结果。提出了一种求解沿铁磁半空间的周期性条形光栅上平面波衍射问题的方法。从理论上预测了以条形光栅为边界的铁磁半空间的E极化平面波反射系数在介质磁导率为负值的频率区域存在共振。这些共振主要是由铁磁半空间表面波从光栅条边缘的反复反射引起的。结论。所建立的求解介质界面上周期性条形光栅平面电磁波衍射的方法可以推广到考虑平面铁磁层而不是铁磁半空间。理论预测的反射系数共振对雷达吸波涂层的合成至关重要。
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引用次数: 0
Space-borne radar observation of near-surface wind effect on anomalously highly-directional backscattering of radio waves from aeolian processes of sand and dust transporting in desert regions 近地表风对沙漠地区沙尘输送过程无线电波异常高方向后向散射影响的星载雷达观测
Pub Date : 2020-02-28 DOI: 10.15407/rej2020.01.021
Dmytry Bychkov, V. Ivanov, A. Matveyev, V. Tsymbal, S. Yatsevich
Aeolian process of sand and dust transporting is known to form the near-ground surface structures over vast territories and fill the atmosphere up with suspended aerosols-like dust particles which are spread then by winds over long distances. The presence of atmospheric dust in the planet's environment is one of the factors affecting the temperature and climatic conditions of vast regions of the Earth. A number of publications (Ivanov et al., 2015; Ivanov et al., 2016; Ivanov et al., 2016; Ivanov et al., 2018) analyze the revealed effect of anomalously highly(narrow) directed backscattering of radio waves which manifests itself in radar remote sensing (in range of local irradiation angles θ ≈ 31°÷32°) in areas covered with deep sand. At the same time, there is no specific data available from published studies investigating the impact of the near-surface wind on anomalously highly-directional backscattering of radio waves based on the results of radar remote sensing researches of Aeolian sand and dust transport processes in desert regions that, in turn, could have been used later to determine the parameters of such transport process. This article presents the results of analysis of the data obtained from long-term studies of desert regions of El-Djuf, Akshar and Trarza in Mauritania by means of space-borne SAR Envisat-1. The purpose of the analysis was actually to identify the specifics of the effect that the near-surface wind has on the anomalously highly-directional backscattering of radio waves which is identified by radar based researches of Aeolian processes of sand and dust transport in desert regions, so can be used for remote determination of such transportation parameters.
众所周知,风的沙尘输送过程会在广阔的领土上形成近地表面结构,并用悬浮的气溶胶(如尘粒)填充大气,然后通过风远距离传播。地球环境中大气尘埃的存在是影响地球广大地区温度和气候条件的因素之一。许多出版物(Ivanov等人,2015;伊万诺夫等人,2016;Ivanov et al.,2016;伊万诺夫et al.,2018)分析了在深沙覆盖地区的雷达遥感(在局部辐射角θ≈31°÷32°的范围内)中表现出的异常高(窄)定向无线电波反向散射的揭示影响。与此同时,根据对沙漠地区风沙和沙尘输送过程的雷达遥感研究结果,研究近地表风对异常高方向无线电波后向散射的影响的已发表研究中没有具体数据,本可以稍后用于确定这种传输过程的参数。本文介绍了利用星载SAR Envisat-1对毛里塔尼亚El Djuf、Akshar和Trarza沙漠地区的长期研究数据进行分析的结果。分析的目的实际上是确定近地表风对异常高方向的无线电波后向散射的影响的细节,这是通过基于雷达的沙漠地区沙尘输送过程研究确定的,因此可以用于远程确定这些输送参数。
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引用次数: 1
Influence of frequency dispersion of a negative-permittivity layer on electromagnetic wave tunneling through a three-layer structure 负介电常数层的频散对三层结构电磁波隧穿的影响
Pub Date : 2020-01-01 DOI: 10.15407/rej2020.02.003
N. Beletskii, S. Borysenko
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引用次数: 1
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Radiofizika i elektronika
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