Journal of Microwaves, Optoelectronics and Electromagnetic Applications最新文献_第10页

Material Selection for Axial Magnetization of a Gyromagnetic NLTL for Space Applications 空间回旋磁NLTL轴向磁化的材料选择

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i3254769

A. F. Teixeira, F. S. Yamasaki, J. O. Rossi, J. Barroso, A. Greco, Daniel A. Nono, M. Nono, E. Rangel, E. Schamiloglu

{"title":"Material Selection for Axial Magnetization of a Gyromagnetic NLTL for Space Applications","authors":"A. F. Teixeira, F. S. Yamasaki, J. O. Rossi, J. Barroso, A. Greco, Daniel A. Nono, M. Nono, E. Rangel, E. Schamiloglu","doi":"10.1590/2179-10742021v20i3254769","DOIUrl":"https://doi.org/10.1590/2179-10742021v20i3254769","url":null,"abstract":"Abstract Nonlinear Transmission Lines (NLTLs) are a new technique for radio frequency (RF) generation. A loaded ferrite NLTL, known as a gyromagnetic line, uses a solenoid to provide an external magnetic bias. In space applications, specifically in satellites, the replacement of these solenoids by permanent magnets is desirable, eliminating the need for a DC current source, and reducing the weight and the effective cost of the launch. This work investigated and selected permanent magnets for this application, and then computationally modeled the magnet assembly to analyze the resulting magnetic field generated and obtained a uniform field region to meet the NLTL operating specifications. For this, we employed selection charts for the proper choice of material to use in an arrangement of magnets simulated by the electromagnetic software CST Microwave Studio . Magnetic fields with uniformity variations of less than 6% and 23% in regions extended over 18.5 cm and 58.8 cm, corresponding to line lengths of 26.6 cm and 68.0 cm, respectively, were achieved in simulations.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41684792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of D-Shaped Optical Fiber based Corrosion Sensor Using LMR and SPR Effects 基于LMR和SPR效应的d型光纤腐蚀传感器分析

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i3254063

V. A. D. Silva Junior, J. Nascimento, J. M. Martins Filho

{"title":"Analysis of D-Shaped Optical Fiber based Corrosion Sensor Using LMR and SPR Effects","authors":"V. A. D. Silva Junior, J. Nascimento, J. M. Martins Filho","doi":"10.1590/2179-10742021v20i3254063","DOIUrl":"https://doi.org/10.1590/2179-10742021v20i3254063","url":null,"abstract":"Abstract This article presents the proposed structure and the simulation results from analytical and numerical modeling of two corrosion sensor elements in D-shaped optical fiber: one based on the lossy mode resonance (LMR) effect and the other based on the effect of surface plasmon resonance (SPR). In the first sensor element, a bilayer of titanium dioxide – aluminum (TiO2-Al) is deposited on the D-shaped region, operating in LMR conditions, while, in the second sensor element, an aluminum (Al) monolayer is deposited under D-shaped region, operating in SPR condition. The sensor elements can operate separately, enabling simultaneous two-parameter measurements at two different points, or they can operate in cascade configuration, increasing the operating range and sensitivity of the sensor set. The D-shaped region of the optical fiber is modeled with an analytical model based on the Fresnel formulation, and also with a numerical model, which uses the finite element method with the COMSOL Multiphysics 5.2 software. The transmission of light through the D-shaped region causes peculiar variations in each light polarization in each sensor element, depending on the metal thickness. Both regions are subject to a corrosive environment. The sensor elements are evaluated separately and in cascade configuration, using polarized and nonpolarized light. Finally, the obtained results show two resonance valleys for the same operating wavelength, resulting in a higher operating range with high sensitivity, compared to other corrosion sensor structures found in the literature.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" 30","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41311038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Recovering Suppressed Resonance Frequency by Bias Lines in Reconfigurable FSS 可重构FSS中偏置线抑制谐振频率的恢复

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i31193

A. Gomes Neto, J. C. Silva, D. Fernandes, Laryssa Maria de Sousa Duarte, Gabryel Jerônimo de Morais

引用次数: 1

Generator Systems for Optical Subcarriers Based on Ring Resonator in Series and Parallel with Phase Modulation 基于相位调制串并联环形谐振腔的光副载波发生器系统

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i3254755

José Danilo da Silva Nogueira, João Pinto da Fonseca Neto, J. Silva

引用次数: 0

A Novel Mode-Matching Formulation of Multifurcated Waveguide Junctions 一种新的多分叉波导结模式匹配公式

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i31292

Guilherme S. Rosa

引用次数: 2

Positioning Analysis of HF Monopole Antennas on a Frigate 护卫舰高频单极天线定位分析

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i3254756

F. Assumpção, M. Dias

引用次数: 0

Circular Waveguide Polarizer for Weather Radars and Satellite Information Systems 用于天气雷达和卫星信息系统的圆波导偏振器

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i31183

S. Piltyay

{"title":"Circular Waveguide Polarizer for Weather Radars and Satellite Information Systems","authors":"S. Piltyay","doi":"10.1590/2179-10742021v20i31183","DOIUrl":"https://doi.org/10.1590/2179-10742021v20i31183","url":null,"abstract":"Abstract This research presents the design and main electromagnetic characteristics of the novel compact microwave waveguide polarizer. The developed device's structure is based on a circular waveguide and anti-phase conducting posts located in it. The application of a circular waveguide instead of a square one allowed simple integration of a polarizer with corrugated horn antennas. The obtaining of required phase difference using a posts-based design provides the possibility of fine tuning of the developed circular waveguide polarizer after its manufacturing process. In addition, simultaneous adaptive operation at orthogonal circular and linear polarizations is available in the antenna system including a polarizer with posts. An automatic control of posts height must be applied in a waveguide in order to provide this option. Numerical simulation, optimization, manufacture and measurements of the polarizer's characteristics were carried out in the operating band 7.4-8.5 GHz. Measured characteristics proved that the suggested circular waveguide polarizer provides good matching and polarization performance. Developed circular waveguide polarizer can be integrated in corrugated horn antenna systems and applied in modern weather radars and satellite information systems.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43854161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Bioimpedance Calculation Considering Spherical Anomalies 考虑球形异常的生物阻抗计算

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i3254752

R. R. A. Coelho, J. Cardoso

引用次数: 0

Adjusting Large-Scale Propagation Models for the Amazon Region Using Bioinspired Algorithms at 1.8 and 2.6 GHz Frequencies 在1.8 GHz和2.6 GHz频率下使用生物启发算法调整亚马逊地区大规模传播模型

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i31099

A. A. P. Carvalho, I. Batalha, M. Neto, B. Castro, F. Barros, J. Araújo, G. Cavalcante

{"title":"Adjusting Large-Scale Propagation Models for the Amazon Region Using Bioinspired Algorithms at 1.8 and 2.6 GHz Frequencies","authors":"A. A. P. Carvalho, I. Batalha, M. Neto, B. Castro, F. Barros, J. Araújo, G. Cavalcante","doi":"10.1590/2179-10742021v20i31099","DOIUrl":"https://doi.org/10.1590/2179-10742021v20i31099","url":null,"abstract":"Abstract In this work, a new method employs Bioinspired Computational (BIC) optimization from the genetic algorithm, bat algorithm, and flower pollination algorithm. Robust and accurate modeling of the input parameters adjusts the propagation models Stanford University Interim, Electronic Communication Committee, and Floating Interception that consider environments with characteristics specifically of urban regions in the Amazon. The lack of research related to the development of propagation models for Amazonian environments motivated this work. Thus, this application proves the effectiveness of using BIC techniques for modeling the communication channel. Measurement campaigns were carried out in the city of Belem, Brazil, for large-scale channel modeling on the frequencies of 1.8 and 2.6 GHz, belonging to the long-term evolution or fourth-generation mobile communications system (4G). After being adjusted by the optimum values calculated by the BIC techniques used, the models showed better results compared to modeling without optimization. Additionally, it was verified an error reduction of about 80% concerning the metrics root-mean-square error and standard deviation.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43351569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A LiDAR Architecture Based on Indirect ToF For Autonomous Cars 基于间接ToF的自动驾驶汽车激光雷达架构

Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2021-09-01 DOI: 10.1590/2179-10742021v20i31137

Luis G. Da Silva, Arismar Cerqueira S. Jr.

引用次数: 0