Radiophysics and Quantum Electronics最新文献_第3页

Experimental Studies of Recognition of Propeller-Modulated Radar Signals Based on the Eigenvalue Analysis of a Sample Correlation Matrix 基于样本相关矩阵特征值分析的螺旋桨调制雷达信号识别实验研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-21 DOI: 10.1007/s11141-026-10498-4

S. A. Kozlov, O. E. Kudryashova, E. S. Fitasov, A. D. Ilyasafov, A. E. Timofeev

引用次数: 0

Subterahertz Radiometer Modulator Operating in the 1.3 mm Atmospheric Transparency Window 工作在1.3毫米大气透明窗口的亚太赫兹辐射计调制器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-21 DOI: 10.1007/s11141-026-10491-x

V. F. Vdovin, P. M. Zemlyanukha, M. V. Efimova, I. V. Lesnov, M. A. Mansfeld, A. S. Marukhno, K. V. Mineev, V. I. Nosov, V. A. Salkov

引用次数: 0

Pulse-Periodic Relativistic Backward-Wave Oscillator with an Electron Beam Power Conversion Efficiency of 50% 电子束功率转换效率达50%的脉冲周期相对论后向波振荡器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10488-6

V. V. Rostov, R. V. Tsygankov, P. V. Vykhodtsev, A. N. Sinyakov, A. S. Stepchenko, M. I. Yalandin, A. N. Yunakov

{"title":"Pulse-Periodic Relativistic Backward-Wave Oscillator with an Electron Beam Power Conversion Efficiency of 50%","authors":"V. V. Rostov, R. V. Tsygankov, P. V. Vykhodtsev, A. N. Sinyakov, A. S. Stepchenko, M. I. Yalandin, A. N. Yunakov","doi":"10.1007/s11141-026-10488-6","DOIUrl":"10.1007/s11141-026-10488-6","url":null,"abstract":"We present the results of theoretical and experimental studies of a relativistic backward-wave oscillator in the long-wavelength band of the centimeter-wave range (λ ≈ 10 cm). Using a nonlinear nonstationary model, weshow that the choice of the reduced high-frequency space charge parameter plays an important role in all options for increasing the oscillator efficiency. Numerical simulation using the macro-particle method and the experiments confirm the need to minimize the intense space charge fields. This key parameter decreases due not only to a decrease in the electron beam current, but also to an increase in the maximum transport current through the slow-wave structure of the backward-wave oscillator. This effect is achieved by bringing the electron beam closer to the structure walls in a nonuniform magnetic field. In this approach, partial current deposition on the slow-wave structure in the electron deceleration region has proven beneficial. The experiment employed the pulse-periodic regime of operation of the relativistic backward-wave oscillator with a clock frequency of up to 250 Hz at a carrier frequency of 3 GHz and a power of 1.0±0.1 GW in pulses with a duration of 23±1 ns. The corresponding degree of the beam–to–wave power conversion can exceed 50%.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"662 - 669"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Subterahertz Superconducting Oscillators Based on Arrays of Josephson Junction 基于约瑟夫森结阵列的亚太赫兹超导振荡器

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10487-7

F. V. Khan, L. V. Filippenko, A. B. Ermakov, N. V. Kinev, V. P. Koshelets

{"title":"Subterahertz Superconducting Oscillators Based on Arrays of Josephson Junction","authors":"F. V. Khan, L. V. Filippenko, A. B. Ermakov, N. V. Kinev, V. P. Koshelets","doi":"10.1007/s11141-026-10487-7","DOIUrl":"10.1007/s11141-026-10487-7","url":null,"abstract":"For most practical applications of superconducting oscillators, it is necessary to implement terahertz generation with the frequency tuning over a wide range and a narrow radiation line in a single device. Until now, this has been achieved only for systems based on distributed Josephson junctions. We give a brief overview of the main achievements in the field of creating superconducting integrated oscillators and present the results of developing a new type of oscillators based on arrays of Josephson junctions included in a superconducting coplanar line. The implementation of a new type of Josephson junctions has provided the possibility of developing an oscillator with operating frequencies of up to 700 GHz, which are limited only by the energy gap of niobium. The use of a superconducting harmonic mixer based on a superconductor–insulator–superconductor tunnel junction made it possible not only to determine the operating frequency range of the oscillator and estimate its power, but also to measure the radiation linewidth of a superconducting oscillator at frequencies of up to 700 GHz in the frequency-stabilization mode and to implement the phase-locked loop mode. The possibility of developing terahertz-superconducting oscillators for integrated receiving systems of ground-based and space radio-telescopes is discussed.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"653 - 661"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full Electromagnetic Modeling of the Properties of an Echelette Cavity of a Gyrotron 回旋管梯队腔特性的全电磁模拟

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10492-w

A. B. Adilova, S. N. Vlasov, V. E. Zapevalov, A. G. Rozhnev

引用次数: 0

Study of Dielectric Properties of Aristar and Aristid Polymer Composite Materials in the Millimeter-Wave Range 马兜铃及其聚合物复合材料在毫米波范围内介电性能的研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10494-8

V. F. Aristov, I. A. Vikhrov, A. A. Eremin, K. V. Mineev, V. V. Parshin, R. M. Rozental, E. A. Serov

引用次数: 0

Heating of a Superconductor–Insulator–Superconductor Mixer Under Exposure to External Terahertz Radiation 超导体-绝缘体-超导体混合器在外部太赫兹辐射下的加热

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10495-7

N. V. Kinev, F. V. Khan, A. M. Chekushkin, V. P. Koshelets

{"title":"Heating of a Superconductor–Insulator–Superconductor Mixer Under Exposure to External Terahertz Radiation","authors":"N. V. Kinev, F. V. Khan, A. M. Chekushkin, V. P. Koshelets","doi":"10.1007/s11141-026-10495-7","DOIUrl":"10.1007/s11141-026-10495-7","url":null,"abstract":"We present the results of studying the thermal effects produced by a backward-wave oscillator signal at a frequency of 1.0–1.1 THz on a mixing element based on an Nb–AlN–NbN superconductor–insulator–superconductor (SIS) tunnel junction included in a NbTiN–SiO2–Al microstrip transmission line. The developed receiving system consists of a slot antenna, matched microstrip transmission lines, and two SIS mixers with junction areas of about 1 μm2. Under exposure to a signal at a frequency around 1 THz, a significant change in the current–voltage characteristic of the SIS junctions was observed, which manifested as a decrease in the gap voltage and indicated heating of the mixing element, significantly affecting the characteristics of the receiving system. An analytical model describing the studied structure exposed to a high-frequency signal is proposed. The mechanisms leading to direct heating of the tunnel junction and to a change in the distribution function of quasiparticles in the electrode material are analyzed. The relevant effects are identified and their influence on the heating of the junction and, as a result, on the decrease in the gap voltage is numerically estimated. The total heat generation budget and the spatial temperature distribution in the integrated circuit are calculated.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"729 - 742"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Possibilities for Increasing the Power of a W-Band Relativistic Gyrotron Using an Electron-Optical System with a Thermionic Cathode 利用带热离子阴极的电子-光学系统提高w波段相对论回旋管功率的可能性

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10493-9

A. N. Leontyev, O. P. Plankin, R. M. Rozental, E. S. Semenov, A. S. Zuev

引用次数: 0

Microwave Reaction Sintering of Ce:YAG—Al2O3 Ceramic Composites from Powder Mixtures of Different Granulometric Compositions 微波反应烧结Ce: YAG-Al2O3陶瓷复合材料的研究

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-20 DOI: 10.1007/s11141-026-10489-5

S. V. Egorov, A. G. Eremeev, K. I. Rybakov, A. A. Sorokin, V. V. Kholoptsev, S. S. Balabanov, T. O. Evstropov, A. A. Vornovskikh, D. Yu. Kosyanov

{"title":"Microwave Reaction Sintering of Ce:YAG—Al2O3 Ceramic Composites from Powder Mixtures of Different Granulometric Compositions","authors":"S. V. Egorov, A. G. Eremeev, K. I. Rybakov, A. A. Sorokin, V. V. Kholoptsev, S. S. Balabanov, T. O. Evstropov, A. A. Vornovskikh, D. Yu. Kosyanov","doi":"10.1007/s11141-026-10489-5","DOIUrl":"10.1007/s11141-026-10489-5","url":null,"abstract":"We obtain samples of Ce:YAG—Al2O3 ceramic composites with a density of up to 97.2% of the theoretical value by microwave reaction sintering of Ce:Y2O3 + Al2O3 powder mixtures via heating by 24-GHz gyrotron radiation to 1680–1725°C with an isothermal hold of 15 min. Optimized sintering schedules with slow heating at high temperatures, ensuring stable microwave heating while minimizing the total process duration, have been proposed. The influence of the particle size in the initial Al2O3 powder on the phase formation in the Y–Al–O system has been studied. A significant effect of the microwave electromagnetic field on the activation of solid-phase diffusion phenomena has been demonstrated. The optical and mechanical properties of the ceramic composite samples obtained in rapid microwave reaction sintering processes are comparable to those of similar materials obtained by conventional consolidation methods.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"68 9","pages":"670 - 676"},"PeriodicalIF":0.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plotting the Electric Field Lines of a Moving Charge 绘制运动电荷的电场线

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2026-07-14 DOI: 10.1007/s11141-026-10485-9

I. P. Kovalev, N. I. Kuzikova

引用次数: 0