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On the Reconfigurability of a Singly-Layered Dual-Band Reflectarray for Space Applications 用于空间应用的单层双频反射镜的可重构性研究
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-06-01 DOI: 10.1590/2179-10742023v22i2272651
R. Farias, C. Peixeiro, M. Heckler
{"title":"On the Reconfigurability of a Singly-Layered Dual-Band Reflectarray for Space Applications","authors":"R. Farias, C. Peixeiro, M. Heckler","doi":"10.1590/2179-10742023v22i2272651","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i2272651","url":null,"abstract":"− This paper presents a feasibility study of a singly-layered dual-band reflectarray for space applications. The data links should operate simultaneously at K-band downlink frequency band 17.7-20.2 GHz with left-hand circular polarization (LHCP) and at Ka-band uplink frequency band 27-30 GHz with right-hand circular polarization (RHCP). The main aim is to present how a reflectarray can be designed so as to allow reconfigurability of its radiation pattern, especially in terms of beam steering to two different directions. The design is automated by means of a computational tool developed in MATLAB environment interfaced with the electromagnetic simulator CST Studio Suite by means of Visual Basic scripts. Simulation results are presented to demonstrate the efficiency of the proposed computational tool and reconfiguration strategy.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43774609","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: 0
Control of Mutual Coupling in Microstrip Antenna Design Based on Bio-inspired Algorithms 基于仿生算法的微带天线设计中互耦控制
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-06-01 DOI: 10.1590/2179-10742023v22i2266052
I. Leal, W. Lopes, M. Alencar, Wamberto J. L. Queiroz
{"title":"Control of Mutual Coupling in Microstrip Antenna Design Based on Bio-inspired Algorithms","authors":"I. Leal, W. Lopes, M. Alencar, Wamberto J. L. Queiroz","doi":"10.1590/2179-10742023v22i2266052","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i2266052","url":null,"abstract":"− This paper presents a model that uses bio-inspired optimization algorithms to control of the mutual coupling (MC) in Multiple-Input Multiple-Output (MIMO) systems. The method promotes an increase in the channel throughput and a reduction in the distance among the array elements, searching values less than a half wavelength. A microstrip antenna design, at the frequency of 26 GHz, is used as a prototype for MIMO system testing and performance analysis. Genetic Algorithm (GA) is used to optimize, to determine the antenna physical parameters and to improve its performance. The mutual impedance concept is used to model the MC. The particle swarm optimization (PSO) algorithm is used to optimize the channel throughput and to reduce the distance between the elements. Simulation results show that it is possible to obtain a MIMO system performance improvement of 11.1% in channel throughput, the microstrip width is reduced by 14.5% and the distance among the elements can be reduced by 23.7%, considering the MC.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41666776","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: 0
A Modified Radiopropagation Multipath Model for Constant Refractivity Gradient Profiles 一种改进的常折射率梯度剖面无线传播多径模型
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-06-01 DOI: 10.1590/2179-10742023v22i2272846
D. Parada, C. Rego, D. Guevara, A. Navarro, G. Ramos, R. Oliveira
{"title":"A Modified Radiopropagation Multipath Model for Constant Refractivity Gradient Profiles","authors":"D. Parada, C. Rego, D. Guevara, A. Navarro, G. Ramos, R. Oliveira","doi":"10.1590/2179-10742023v22i2272846","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i2272846","url":null,"abstract":"− This paper presents a radiopropagation algorithm based on a Ray Tracing (RT) technique that combines a modified multipath model for constant refractivity gradient profiles and the Uniform Theory of Diffraction (UTD). A novel formulation is proposed by the authors for calculation and ground-reflection analysis of ray paths depending on atmospheric refractivity. The algorithm introduced herein was evaluated in a mixed scenario and in two more realistic case studies, under conditions of constant refractivity gradient and lossy terrain profiles. Pathloss results are obtained and compared with Parabolic Equation (PE) numerical solution results at 2.0 GHz, 3.5 GHz and 5.4 GHz. In such conditions, the modified radiopropagation multipath algorithm with atmospheric refractivity introduced herein showed satisfactory results.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47466483","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: 0
Analog Electronic Circuit Synthesis Using Simulated Annealing and Geometric Circuit Evolution 基于模拟退火和几何电路演化的模拟电子电路合成
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1265775
Leonardo Muttoni, A. Veiga
{"title":"Analog Electronic Circuit Synthesis Using Simulated Annealing and Geometric Circuit Evolution","authors":"Leonardo Muttoni, A. Veiga","doi":"10.1590/2179-10742023v22i1265775","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1265775","url":null,"abstract":"− This article presents the SANN-GCE algorithm, a spice simulation driven meta-heuristic to design general discrete analog electronic circuits automatically, both circuit topology and component sizing. We introduce an encoding scheme called Geometric Circuit Evolution (GCE) that works associated with the Simulated Annealing algorithm and uses categorized degrees of freedom, that allows distinct characteristics of a circuit to change with different probabilities according to its type during the circuit evolution. We show through a series of seven active test circuits that SANN-GCE, compared to a benchmark, present a median fitness 15.88 times better, with a median standard deviation 6.72 times lower between runs. The median runtime found was 14.17 times lower.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48547647","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: 0
Automated Forearm Prosthesis Controlling Using Fiber Bragg Grating Sensor 利用光纤布拉格光栅传感器实现前臂假体的自动控制
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1271724
Péricles Valera Rialto Júnior, E. H. Dureck, Alessandra Kalinowski, C. Zamarreño, A. B. Socorro-Leránoz, J. Silva, A. Lazzaretti, U. Dreyer
{"title":"Automated Forearm Prosthesis Controlling Using Fiber Bragg Grating Sensor","authors":"Péricles Valera Rialto Júnior, E. H. Dureck, Alessandra Kalinowski, C. Zamarreño, A. B. Socorro-Leránoz, J. Silva, A. Lazzaretti, U. Dreyer","doi":"10.1590/2179-10742023v22i1271724","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1271724","url":null,"abstract":"Abstract This paper describes the automation of a forearm prosthesis using the signal collected by a Fiber Bragg Grating (FBG) sensor. The FBG sensor is applied to one subject's forearm to measure the deformation as a result of the index and middle fingers when moved individually. It is possible to control a one joint model prosthesis allied to a compliant hand mechanism through signal analyses. Each finger movement has its features, such as its amplitude, which opens the possibility of using those to control different parts of the prosthesis, joint rotation by the middle finger, and compliant hand movement by the index finger. This paper presents results regarding prosthesis assembling, Hypertext Transfer Protocol (HTTP) communication latency between prosthesis and computer and tests with pre-acquired and processed FBG signal data. The prosthesis wrist rotation movement is related to the middle finger signal, and its compliant mechanism actuation is due to index finger signal. The communication between prosthesis and the computer had a mean latency of 140 ms and a standard deviation of 18 ms. The results demonstrate the potential for using the sensor system and automated prosthesis in other applications involving real-time forearm sensing, multi-finger signal analysis, and prosthetic movement.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43520469","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: 0
Absorb/Transmit Broadband Type Frequency Selective Surface 吸收/发射宽带型频率选择表面
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1268430
José Jaime G. P. Neto, A. Campos, R. Lira, A. Gomes Neto, Maurício W. B. Silva
{"title":"Absorb/Transmit Broadband Type Frequency Selective Surface","authors":"José Jaime G. P. Neto, A. Campos, R. Lira, A. Gomes Neto, Maurício W. B. Silva","doi":"10.1590/2179-10742023v22i1268430","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1268430","url":null,"abstract":"− Frequency Selective Surfaces (FSS) are increasingly being used in telecommunications systems due to the numerous advantages presented by this sort of structure, among them low cost, ease of fabrication, and low profile stand out. This work reports the design, fabrication, and characterization of a multilayer frequency-selective absorber (FSA) for broadband operation. The proposed structure shows an absorption performance (operating in the frequency range between 2 GHz and 6 GHz) within the transmission band. The absorber consists of cascaded frequency selective surfaces, which are composed of both conductive square loops, which reflect incident signals, and resistive ones, which act as an absorbing layer. To verify the absorbing structure performance, full-wave numerical simulations and measurements are presented. The measured results are in good agreement with the numerical ones and show that the design performs absorption above 80% within the range of 2.48 GHz to 6.13 GHz, which verifies the project properties. Besides that, numerical results show that the proposed absorber has a proper response under oblique incidence up to 30 ◦ .","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48430342","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: 0
Comparing the Performance of OFDM and OCDM-based Visible Light Communications: Numerical and Experimental Analysis 基于OFDM和OCDM的可见光通信性能比较：数值和实验分析
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1270869
Augusto C. F. Peterle, Wesley S. Costa, Higor Camporez, M. Segatto, H. Rocha, Jair Silva
{"title":"Comparing the Performance of OFDM and OCDM-based Visible Light Communications: Numerical and Experimental Analysis","authors":"Augusto C. F. Peterle, Wesley S. Costa, Higor Camporez, M. Segatto, H. Rocha, Jair Silva","doi":"10.1590/2179-10742023v22i1270869","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1270869","url":null,"abstract":"− Numerical and experimental analysis of visible light communication (VLC) systems based on orthogonal chirp division multiplexing (OCDM) and orthogonal frequency division multiplexing (OFDM) are presented in this paper. Unlike most of the related publications, in this work we numerically compared OCDM and OFDM based VLC systems with the same equalization process, i.e., employing an one tap equalizer (OTE) in both systems. Simulation results in line-of-sight VLC channels show that both systems have the same performance when baseband multicarrier signals are used. The impact of the optical modulation index and the bias current of a previously characterized light-emitting diode were also evaluated. Nevertheless, the experimental demonstrations, in which bandpass signals were used due to the bandpass characteristic of the exploited setup, show that OFDM-based system outperforms the VLC links with OCDM signals, when the OTE equalizer is used in both systems. The performance of the OCDM-based system was improved by using a zero forcing frequency domain equalizer.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45196766","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: 0
A Multi-Plasmonic Approach for Simultaneous Measurements based on a D-Shaped Photonic Crystal Fiber Sensor: from Temperature to Optical Dispersion 基于d形光子晶体光纤传感器的多等离子体同步测量方法:从温度到色散
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1270778
A. F. Romeiro, M. P. Cardoso, Anderson O. Silva, J. C. Costa, M. T. Giraldi, J. Santos, J. Baptista, A. Guerreiro
{"title":"A Multi-Plasmonic Approach for Simultaneous Measurements based on a D-Shaped Photonic Crystal Fiber Sensor: from Temperature to Optical Dispersion","authors":"A. F. Romeiro, M. P. Cardoso, Anderson O. Silva, J. C. Costa, M. T. Giraldi, J. Santos, J. Baptista, A. Guerreiro","doi":"10.1590/2179-10742023v22i1270778","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1270778","url":null,"abstract":"— The growing demand for multiparameter sensors includes compact devices accompanied by simple calibration processes to distinguish the outputs from each other. This paper evaluates a scheme to determine multiple parameters of a medium using localized surface plasmon resonances (SPR) excited on a D-shaped photonic crystal fiber (PCF) partially covered by two gold layers of different thicknesses. We demonstrate that the proposed sensing platform, once customized to characterize the possible dispersive profiles of the refractive index of the analyte, also allows interrogating the temperature of a sample from a linear relationship. Since the plasmonic resonances are excited at separated and low crosstalk spectral channels, different sensing responses can be obtained simultaneously in the same location of the D-shaped PCF. These features turn out the SPR sensor a suitable tool for simultaneous monitoring of optical dispersion and temperature.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41834867","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: 0
Characterization of Dielectric Properties of Graphene and Graphite Using the Resonant Cavity in 5G Test Band 5G测试频段中石墨烯和石墨的谐振腔介电性能表征
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742021v20i3264599
V. M. Pereira, Luis G. Hardt, D. G. Fantineli, M. Heckler, L. E. G. Armas
{"title":"Characterization of Dielectric Properties of Graphene and Graphite Using the Resonant Cavity in 5G Test Band","authors":"V. M. Pereira, Luis G. Hardt, D. G. Fantineli, M. Heckler, L. E. G. Armas","doi":"10.1590/2179-10742021v20i3264599","DOIUrl":"https://doi.org/10.1590/2179-10742021v20i3264599","url":null,"abstract":"— This paper presents a study about the dielectric constant r e , dielectric loss tangent tan ( ) g d","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43806986","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: 0
Computational Modeling of Magnetic Field Optical Fiber Sensor Considering Temperature Effects 考虑温度效应的磁场光纤传感器计算模型
Journal of Microwaves, Optoelectronics and Electromagnetic Applications Pub Date : 2023-03-01 DOI: 10.1590/2179-10742023v22i1265918
A. Silva, Hebio J. B. Oliveira, H. Alves, J. Nascimento, J. M. Martins Filho
{"title":"Computational Modeling of Magnetic Field Optical Fiber Sensor Considering Temperature Effects","authors":"A. Silva, Hebio J. B. Oliveira, H. Alves, J. Nascimento, J. M. Martins Filho","doi":"10.1590/2179-10742023v22i1265918","DOIUrl":"https://doi.org/10.1590/2179-10742023v22i1265918","url":null,"abstract":"Abstract Due to the vast area of application and reliability, fiber optic magnetic field sensors have been the subject of several studies, however, some of these application areas are submitted to temperature variations, which can hinder the sensors in monitoring the magnetic field. With this panorama, this work analyzes through computational modeling a fiber optical magnetic field sensor, using the magneto-optical Faraday effect and observing temperature effects in the sensor response. For modeling, a numerical model built in COMSOL Multiphysics is used. The results show a value for cross-sensitivity of 3.27 mT/°C in a non-optimized configuration of the sensor and of 2.47 mT/°C for an optimized configuration. A methodology for optimizing the sensor to operate in a certain temperature range, 55 to 75 °C, is also discussed. The results presented in this work show that the temperature is an important factor to be considered to improve the selectivity and to obtain the correct sensitivity of the sensor.","PeriodicalId":53567,"journal":{"name":"Journal of Microwaves, Optoelectronics and Electromagnetic Applications","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41441009","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: 0
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