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Annular slot antenna for high-precision GPS applications 用于高精度GPS应用的环形槽天线
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646481
L. S. Pereira, R. Farias, C. Lucatel, M. Heckler, Alexis F. Tinoco Salazar
{"title":"Annular slot antenna for high-precision GPS applications","authors":"L. S. Pereira, R. Farias, C. Lucatel, M. Heckler, Alexis F. Tinoco Salazar","doi":"10.1109/IMOC.2013.6646481","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646481","url":null,"abstract":"This paper presents the design of a printed antenna with annular slot geometry for GNSS applications. Two prototypes were built in order to meet the requirements of these systems. Different feeding techniques have been proposed in order to obtain the right-hand circular polarization. Electrical walls were added in the prototypes to avoid losses by parallel plate modes, to improve the radiation efficiency, gain and axial ratio. The proposed geometries were designed and built with two different feeding schemes: the first one is based on a series feed, whereas the other is based on the integration of a 90°-hybrid. The results showed that the synthesized antenna has all features required to operate in the Global Navigation Satellite Systems (GNSS).","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126927994","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
Barium nanotitanate microwave ceramics obtained by a chemical method 化学法制备纳米钛酸钡微波陶瓷
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646599
P. J. Castro, S. M. Zanetti
{"title":"Barium nanotitanate microwave ceramics obtained by a chemical method","authors":"P. J. Castro, S. M. Zanetti","doi":"10.1109/IMOC.2013.6646599","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646599","url":null,"abstract":"Dielectric resonators with high dielectric constant, low dielectric losses and high frequency stability have been widely used in microwave circuits for telecommunications as filters, oscillators, antennas. Among the compounds of the BaO-TiO2 system, Ba2Ti9O20 has met these requirements. However, such materials are difficult to obtain by conventional mechanical powder mixture due to the preferential formation of secondary phases and high sintering temperatures around 1300°C. In this investigation a new approach for obtaining B2O3-added Ba2Ti9O20 is considered through a chemical method involving a co-precipitation process aiming to reduce the sintering temperature and to promote a high microstructural homogeneity of the compound. Therefore, cylindrical ceramics were sintered at 1000-1150°C presenting values of electric permittivity from 34.8 to 41.4, quality factor due to dielectric losses from 2945 to 3525, temperature coefficient from 6.2 to 10.2 ppm/°C and an overall tunable frequency range of 5.00-7.00 GHz, which yields promising properties for use as dielectric resonators.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115107124","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
Human being exposure to electromagnetic fields analysis on Belém metropolitan area 白俄罗斯首都圈人体电磁场暴露分析
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646440
B. C. Quadros, R. A. Nascimento, C. A. Nunes, R. L. Fraiha Lopes, C. Guimaraes, H. Gomes, G. Cavalcante
{"title":"Human being exposure to electromagnetic fields analysis on Belém metropolitan area","authors":"B. C. Quadros, R. A. Nascimento, C. A. Nunes, R. L. Fraiha Lopes, C. Guimaraes, H. Gomes, G. Cavalcante","doi":"10.1109/IMOC.2013.6646440","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646440","url":null,"abstract":"In the process of Digital Television expansion in Brazil, various studies regarding this subject, considering signal transmission, modulation analysis, signal reception analysis, have been executed. This work aims to outline the limit values for human exposure to electromagnetic fields (EMF), considering the UHF frequency band from 406 MHz to 806 MHz. This frequency band is associated to digital television (TVD) broadcasting services and was defined by the Telecommunications National Agency of Brazil (ANATEL) resolution no. 303/2002. Measurements were carried out in Belém city (situated in the Brazilian Amazon Region). A EMF radiation level analysis study is presented in this paper.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126026410","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 low phase noise oscillator prototype at 10GHz using Sapphire cavity for the Brazilian gravitational wave detector Mario Schenberg 巴西引力波探测器Mario Schenberg用蓝宝石腔10GHz低相位噪声振荡器样机
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646435
M. Mosso, V. P. Magri, C. L. Barucke, J. A. Souza, O. Aguiar, S. R. Furtado
{"title":"A low phase noise oscillator prototype at 10GHz using Sapphire cavity for the Brazilian gravitational wave detector Mario Schenberg","authors":"M. Mosso, V. P. Magri, C. L. Barucke, J. A. Souza, O. Aguiar, S. R. Furtado","doi":"10.1109/IMOC.2013.6646435","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646435","url":null,"abstract":"This work describes the development of an oscillator prototype at 10GHz that consists of a feedback loop amplifier using a Sapphire loaded cavity and a tunable cylindrical cavity filter. Measurement procedures involving a phase detector circuit technique are described. The phase noise performance obtained at room temperature is -127,32 dBc/Hz at 3KHz and the electrical quality factor (Q) is around 105.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125133206","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: 1
Long term analysis of leakage current pulses registered by an optical sensor network 由光学传感器网络记录的泄漏电流脉冲的长期分析
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646584
Leandro H. S. Silva, S. C. Oliveira, Ricardo Ataide de Lima, E. Fontana
{"title":"Long term analysis of leakage current pulses registered by an optical sensor network","authors":"Leandro H. S. Silva, S. C. Oliveira, Ricardo Ataide de Lima, E. Fontana","doi":"10.1109/IMOC.2013.6646584","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646584","url":null,"abstract":"The loss of insulation capacity caused by pollution deposition on insulator strings can be inferred from the analysis of the electric arcs due to partial discharges on the insulators. The partial discharges also cause pulses superposed to the leakage current signal. An optical sensor system network was developed and installed in the northeast region of Brazil to monitor the degree of pollution deposited over insulator strings of high voltage transmission lines. The monitoring system comprises leakage, humidity and temperature sensors, a processing electronic module and a satellite communication link. They were installed on 230 and 500 kV towers. This paper presents a correlation study comparing the information obtained from the monitoring systems and the electric arc levels obtained by traditional visual inspections. Also the rain events influence the leakage current behavior and a rain pattern recognition system is used in order to better evaluate the leakage current behavior.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123682887","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: 1
High-frequency benchmark circuit design for a sub 50 nm CNTFET technology 高频基准电路设计的一个亚50纳米CNTFET技术
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646521
M. Claus, A. Mukherjee, Alex Moroguma, A. Pacheco, S. Blawid, M. Schroter
{"title":"High-frequency benchmark circuit design for a sub 50 nm CNTFET technology","authors":"M. Claus, A. Mukherjee, Alex Moroguma, A. Pacheco, S. Blawid, M. Schroter","doi":"10.1109/IMOC.2013.6646521","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646521","url":null,"abstract":"The acceptance of an emerging revolutionary process technology for circuit and system design depends significantly on (i) unique device features provided by the technology, (ii) a reliable fabrication process, and (iii) a suitable transistor compact model for circuit design and simulation. Carbon nanotube (CNT) field-effect transistors (FETs) belong to a group of emerging technologies for 1D-electronics which might have the potential to replace an existing semiconductor process technology due to their unique intrinsic properties, especially in the field of analog high-frequency (HF) circuit applications such as amplifiers, oscillators and mixers. The recent progress in CNTFET process technologies has increased the demand for suitable compact models. This paper focuses on the application of a recently developed physics-based compact model TCAM for the design of analog HF circuits. In addition, the impact of important CNTFET technology parameters on the behavior of selected HF benchmark circuits is studied.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122721109","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
Indoor signal coverage of a leaky feeder cable 漏电馈线的室内信号覆盖
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646546
V. P. A. Santos, F. da Fonseca, L. J. de Matos, W. D. T. Meza, G. L. Siqueira, L. Ramirez
{"title":"Indoor signal coverage of a leaky feeder cable","authors":"V. P. A. Santos, F. da Fonseca, L. J. de Matos, W. D. T. Meza, G. L. Siqueira, L. Ramirez","doi":"10.1109/IMOC.2013.6646546","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646546","url":null,"abstract":"Recently the use of the leaky feeder cable became increasingly important for signal coverage in indoor environments as universities, shoppings and mines. Moreover, a radiating cable can be considered as a possible solution in emergency staircases or elevator shafts. This motivated to carry out measurements that led to studying the signal behavior along a corridor in the fourth floor of Federal Fluminense University Engineering building where it is installed. Besides the large scale fading, the signal coverage was studied for points below the cable and beyond the cable.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131469228","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: 9
Switched smart antenna system for SCADA telesupervision and telecontrol systems 用于SCADA远程监控系统的切换智能天线系统
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646466
B. D. de Oliveira, M. Santos, A. D. de Oliveira, M. T. de Melo, E. A. B. Santos, R. D. Freitas, L. P. Pontes, M. M. L. Santos
{"title":"Switched smart antenna system for SCADA telesupervision and telecontrol systems","authors":"B. D. de Oliveira, M. Santos, A. D. de Oliveira, M. T. de Melo, E. A. B. Santos, R. D. Freitas, L. P. Pontes, M. M. L. Santos","doi":"10.1109/IMOC.2013.6646466","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646466","url":null,"abstract":"This paper presents the conception and simulation results of a switched smart antenna array to be used for a reliable communication between a Distributor of Electricity and its automation devices such as remotely supervised and controlled electrical switches. The smart antenna system controls the direction of the radiation main lobe, increasing the transmitted power density, which allows the establishment of communication with devices located in shadow regions. This prevents new repeater stations to be installed for the same purpose. Also laboratory tests with Beamforming Controller Circuit are here reported.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130708757","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: 1
Design of an optical sensing interrogator using an edge filter scheme 采用边缘滤波方案的光传感询问器的设计
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646509
Jhon E. Alfonso, Luis G. Cardenas, C. Triana, Margarita Varon Duran
{"title":"Design of an optical sensing interrogator using an edge filter scheme","authors":"Jhon E. Alfonso, Luis G. Cardenas, C. Triana, Margarita Varon Duran","doi":"10.1109/IMOC.2013.6646509","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646509","url":null,"abstract":"In this paper the design and initial development of a Fiber Bragg Grating (FBG) sensor interrogation system are presented. It uses an edge filter, among other optical components, and measures the wavelength signals with a microcontroller. The system was designed for the 1550 nanometers band with an acquisition rate of 2.5 kHz. The performance of the interrogator was tested obtaining a stable voltage ratio when changing the input signal and a linear performance of this voltage ratio when a temperature of 20-70° C is induced into a FBG sensor connected to the system. These results demonstrate the feasibility of specific, low-cost interrogation systems with high acquisition rates.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131052293","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: 6
Plasmonic Fabry-Perot cavity as platform to build nano-optical filters and sensors 等离子体法布里-珀罗腔作为构建纳米光学滤光片和传感器的平台
2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC) Pub Date : 2013-10-28 DOI: 10.1109/IMOC.2013.6646453
M. P. Cardoso, Anderson O. Silva, J. C. Costa
{"title":"Plasmonic Fabry-Perot cavity as platform to build nano-optical filters and sensors","authors":"M. P. Cardoso, Anderson O. Silva, J. C. Costa","doi":"10.1109/IMOC.2013.6646453","DOIUrl":"https://doi.org/10.1109/IMOC.2013.6646453","url":null,"abstract":"This work deals with the nano-optical version of a Fabry-Perot cavity. By exciting plasmon modes on the metallic nanoparticles in the cavity, optical power can be squeezed into subwavelength scale without scattering effects stemmed from diffraction. As suggested by our results, it surges feasible to use such structure as a building block for optical resonators at nanometer dimensions. Furthermore, the enhanced near-field provided by the plasmon modes yields a high-sensitive ultra-compact area, which meets potential applications for biochemical sensing.","PeriodicalId":395359,"journal":{"name":"2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131251969","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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