Radio Science最新文献_第10页

Iterative gradient correction (IGC) method for true height analysis of ionograms 用于离子图真实高度分析的迭代梯度校正（IGC）方法

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-11-01 DOI: 10.1029/2023RS007808

M. Ankita;S. Tulasi Ram

引用次数: 0

Front matters 前方事项

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-11-01 DOI: 10.1002/rds.21148

引用次数: 0

Analysis and application of the electromagnetic wave propagation, fields, and dispersion relation in an elliptical chiro plasma waveguide immersed in magnetized plasma 浸没在磁化等离子体中的椭圆驰豫等离子体波导中的电磁波传播、场和色散关系的分析与应用

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-11-01 DOI: 10.1029/2023RS007815

N. Gholamshahi;A. Abdoli-Arani

{"title":"Analysis and application of the electromagnetic wave propagation, fields, and dispersion relation in an elliptical chiro plasma waveguide immersed in magnetized plasma","authors":"N. Gholamshahi;A. Abdoli-Arani","doi":"10.1029/2023RS007815","DOIUrl":"10.1029/2023RS007815","url":null,"abstract":"This research proposes and investigates an elliptical waveguide filled with chiro plasma as its core and magnetized plasma as its clad region. The clad region is in the constant infinite magnetic field, and its direction is the same as the wave propagation in the chiro plasma elliptical waveguide. The electromagnetic wave propagation in the considered waveguide is studied. The expressions for electromagnetic field components in the chiro plasma core and magnetized plasma cladding are derived. The dispersion relations for the hybrid modes are calculated considering appropriate boundary conditions at the chiro plasma and magnetized plasma interface. The behavior of the energy flux and the dispersion curves are numerically and graphically studied. It is seen that the magnitude of the power density decreases with the increase of the cyclotron frequency and it increases with the increase of the plasma frequency and supports power flow in the backward direction for the considered mode. Furthermore, it is shown higher values of the chirality parameter cause the magnitude of the power flux to increase in the backward direction.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"58 11","pages":"1-12"},"PeriodicalIF":1.6,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134907384","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

Proposal of technique for analysis of complementary frequency selective surfaces 互补频率选择曲面分析技术的提出

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-10-01 DOI: 10.1029/2022RS007621

B. S. da Silva;A. L. P. S. Campos;M. E. T. Sousa;M. W. B. Silva;H. D. Andrade

{"title":"Proposal of technique for analysis of complementary frequency selective surfaces","authors":"B. S. da Silva;A. L. P. S. Campos;M. E. T. Sousa;M. W. B. Silva;H. D. Andrade","doi":"10.1029/2022RS007621","DOIUrl":"https://doi.org/10.1029/2022RS007621","url":null,"abstract":"A specific class of frequency selective surface (FSS) is the complementary frequency selective surface (CFSS) that has interesting characteristics such as high angular stability, multiple transmission and/ or reflection bands, and the possibility of miniaturization. The analysis and design of this sort of structure are commonly performed using commercial software, which demands a high computational effort, impacting a longer optimization time. The equivalent circuit model combined with a cascading technique emerges as an alternative method to the use of these softwares, in the optimization of the physical dimensions of these structures, as they model the behavior of a CFSS with low computational effort and optimization time, in addition to being able to be implemented in various programming languages. Thus, this work proposes a CFSS analysis technique that combines the equivalent circuit method with the ABCD matrix. To the best of our knowledge, this is the first reported research on approximate techniques for CFSS analysis. The chosen geometry was the circular ring, due to high angular stability and polarization independence. The modeling of the equivalent circuit for patch and aperture geometries is presented. Some structures are simulated, and the results are compared with results obtained with the HFSS software. Finally, two prototypes are built to validate the analyses performed.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"58 10","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71903264","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

Front matters 前线事务

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-10-01 DOI: 10.1002/rds.21147

引用次数: 0

Quantitative relationship between current pulses and associated low-frequency magnetic fields during initial stage of rocket-triggered lightning 火箭闪电初始阶段电流脉冲与相关低频磁场的定量关系

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-10-01 DOI: 10.1029/2022RS007647

Xiao Li;Gaopeng Lu;Ziyi Wang;Rubin Jiang;Yanfeng Fan;Yucheng Zi;Feifan Liu;Kainat Qamar;Alice Nambalirwa;Tao Shi;Baoyou Zhu

{"title":"Quantitative relationship between current pulses and associated low-frequency magnetic fields during initial stage of rocket-triggered lightning","authors":"Xiao Li;Gaopeng Lu;Ziyi Wang;Rubin Jiang;Yanfeng Fan;Yucheng Zi;Feifan Liu;Kainat Qamar;Alice Nambalirwa;Tao Shi;Baoyou Zhu","doi":"10.1029/2022RS007647","DOIUrl":"https://doi.org/10.1029/2022RS007647","url":null,"abstract":"The quantitative relationship between the channel-base current and the associated low-frequency magnetic field (B-field) during the early stage of rocket-triggered lightning was examined based on field experiments and numerical simulation. There is a good correlation between the current pulse and the corresponding B-field pulse in terms of amplitude and duration. In specific, the duration of current pulse is approximately proportional to that of the corresponding B-field pulse for precursors and initial upward leaders; as for the pulse amplitude, the linear correlation is more apparent for the initial upward leaders when compared to the precursors, with the ratio of B-field pulse and current pulse between 1.7 and 2.0, which is always greater than that (0.97–1.32) for the precursors. A response function is established to show the quantitative relationship in the time domain between the current pulse and the associated B-field pulse, which is considered as the convolution of the current pulse and the response function. Meanwhile, the current waveform can be obtained if the measured B-field pulse is de-convolved with the response function. The simulation results are in good agreement with the measurement, which proves that our approach is accurate and efficient to quantify the relationship between the current and the B-field pulse of the initial leader discharges.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"58 10","pages":"1-12"},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71903261","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

Effects of the relative dynamics of ionospheric irregularities and GPS satellites on receiver tracking loop performance 电离层不规则和GPS卫星相对动力学对接收机跟踪回路性能的影响

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-10-01 DOI: 10.1029/2023RS007669

Trisani Biswas;Ashik Paul

{"title":"Effects of the relative dynamics of ionospheric irregularities and GPS satellites on receiver tracking loop performance","authors":"Trisani Biswas;Ashik Paul","doi":"10.1029/2023RS007669","DOIUrl":"https://doi.org/10.1029/2023RS007669","url":null,"abstract":"Transionospheric satellite signals are exposed to perturbation, caused by irregularities generated in the ionosphere. However, the characteristics of the satellite motion can have an additional impact on signal perturbation, in addition to the effects of irregularity structures, that drift from west to east during geomagnetic quiet conditions. This paper reports the effect of Global Positioning System satellite geometry, on tracking loop performance of ground-based receivers, during occurrence of ionospheric scintillations. Observations are made from station Calcutta (22.58°N, 88.38°E geographic; magnetic dip 34.54°), located near the northern crest of Equatorial Ionization Anomaly, during three different solar activity periods (March 2014, March 2015, and March 2022). Efforts have been made to study the correlation of east-west component of satellite velocity at Ionospheric Pierce Point (IPP) with duration of loss-of-lock and rate of signal fading (<−10 dB), from ground scintillation pattern observations. Results of this study show 75%–78% correlation between duration of loss-of-lock and eastward component of satellite velocity, for all three period of observation. Subsequently, shorter duration of loss-of-lock has been observed corresponding to satellite velocity being westward. Signal fading rate is found to decrease with increasing satellite velocity, having median value of the fading rate cumulative distribution percentage, corresponding to satellite velocity of 16.69, 31.76, and 19.14 m/s respectively during March 2014, March 2015, and March 2022. Results of this study also indicate direction and component of satellite velocity at IPP to be a dominant cause of signal outage, even during periods of weak to moderate scintillations.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"58 10","pages":"1-16"},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71903262","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

High performance antenna system in MIMO configuration for 5G wireless communications over sub-6 GHz spectrum 用于亚6GHz频谱5G无线通信的MIMO配置的高性能天线系统

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-10-01 DOI: 10.1029/2023RS007726

Iftikhar ud Din;Mohammad Alibakhshikenari;Bal S. Virdee;Sadiq Ullah;Shakir Ullah;Muhammad Rizwan Akram;Syed Mansoor Ali;Patrizia Livreri;Ernesto Limiti

{"title":"High performance antenna system in MIMO configuration for 5G wireless communications over sub-6 GHz spectrum","authors":"Iftikhar ud Din;Mohammad Alibakhshikenari;Bal S. Virdee;Sadiq Ullah;Shakir Ullah;Muhammad Rizwan Akram;Syed Mansoor Ali;Patrizia Livreri;Ernesto Limiti","doi":"10.1029/2023RS007726","DOIUrl":"https://doi.org/10.1029/2023RS007726","url":null,"abstract":"This paper presents a high-performance multiple input and multiple output (MIMO) antenna comprising 2 × 2 configuration of radiating elements that is designed for sub-6 GHz applications. The proposed MIMO antenna employs four identical radiating elements. High isolation between the radiating elements and therefore reduced mutual coupling is achieved by spatially arranging the radiating elements in an orthogonal configuration. Also, a novel frequency selective surface (FSS) was employed to increase the gain of the MIMO antenna over a wide bandwidth from 3 to 6 GHz. This was achieved by locating the FSS above the antenna at a certain height. The FSS essentially enhanced the antenna's directivity, reduced back lobe radiation and mutual coupling. The antenna was fabricated on a standard Rogers RT Duroid 5880 dielectric substrate with a 0.8 mm thickness. The overall dimension of the MIMO antenna is 50 × 50 × 12.5 mm\u0000<sup>3</sup>\u0000 and it operates from 3.8 to 6 GHz, which corresponds to a fractional bandwidth of 41%. The proposed MIMO antenna has a measured peak gain of 4.8 dBi and inter radiation element isolation >20 dB. Its envelope correlation coefficient is <0.1>9.9 (dB). These characteristics make the proposed MIMO antenna system suitable for 5G communication systems.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"58 10","pages":"1-22"},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71903263","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

Four-beams-reconfigurable circular-ring array antennas for monopulse radar applications 单脉冲雷达应用的四波束可重构圆环阵列天线

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-09-01 DOI: 10.1029/2023RS007776

Giada M. Battaglia;Tommaso Isernia;Roberta Palmeri;Andrea F. Morabito

引用次数: 0

Front matters 前很重要

IF 1.6 4区地球科学

Radio Science Pub Date : 2023-09-01 DOI: 10.1002/rds.21146

引用次数: 0