Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169414
Augusto Cesar Pereira da Silva Montalvao, Emanuele da Silva Rodrigues Montalvao, A. D’assunção, L. M. de Mendonça, A. Neto
This paper presents the numerical characterization of two RFID tags. The analysis of these structures is made using the WCIP. Are compared the initial results found in literature with those obtained through simulations on WCIP with objective to show that this method is able to analyze such structures. Is shown still, the behavior of electric and magnetic fields, the latter through the electrical current density vector. Are presented suggestions for the continuation of this work.
{"title":"Numerical characterization of RFID tags using WCIP","authors":"Augusto Cesar Pereira da Silva Montalvao, Emanuele da Silva Rodrigues Montalvao, A. D’assunção, L. M. de Mendonça, A. Neto","doi":"10.1109/IMOC.2011.6169414","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169414","url":null,"abstract":"This paper presents the numerical characterization of two RFID tags. The analysis of these structures is made using the WCIP. Are compared the initial results found in literature with those obtained through simulations on WCIP with objective to show that this method is able to analyze such structures. Is shown still, the behavior of electric and magnetic fields, the latter through the electrical current density vector. Are presented suggestions for the continuation of this work.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121310413","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169244
Abraham Ortega, L. de Menezes, A. Soares, H. Abdalla
An improved periodic defected ground structure (DGS) is investigated for low-pass filter (LPF) applications. The realization in microstrip configuration consists in making the equivalence between the geometry of a DGS structure and a parallel LC resonator circuit. Initially, one filter is designed using identical DGS, equally spaced. Varying empirically the dimensions of the DGS, we obtain an improvement of frequency responses. In order to verify the performances of the proposed changes in the filter, simulations were done between the uniform periodic DGS circuit and the improved non uniform periodic DGS. The results show that the latter exhibits better stopband performance, with suppressing ripples and enlarging the bandwidth. One modified DGS filter was designed and fabricated. The measurements show good consistency with the simulated results.
{"title":"Design of low-pass microstrip filters based on defected ground structure","authors":"Abraham Ortega, L. de Menezes, A. Soares, H. Abdalla","doi":"10.1109/IMOC.2011.6169244","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169244","url":null,"abstract":"An improved periodic defected ground structure (DGS) is investigated for low-pass filter (LPF) applications. The realization in microstrip configuration consists in making the equivalence between the geometry of a DGS structure and a parallel LC resonator circuit. Initially, one filter is designed using identical DGS, equally spaced. Varying empirically the dimensions of the DGS, we obtain an improvement of frequency responses. In order to verify the performances of the proposed changes in the filter, simulations were done between the uniform periodic DGS circuit and the improved non uniform periodic DGS. The results show that the latter exhibits better stopband performance, with suppressing ripples and enlarging the bandwidth. One modified DGS filter was designed and fabricated. The measurements show good consistency with the simulated results.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121529564","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169312
Robson K. B. e Silva, D. T. Lopes, C. Motta
This paper presents the experimental results of Rsh/Q0 measurements in klystron cavities using the perturbation technique. The theory involving this technique results in an expression which depends on the natural frequency f0 and the perturbed frequency shift Δf, both measured using a cylindrical reentrant cavity with offset gap built in the laboratory. In addition, it is used a cylindrical cavity (pill-box) to calculate a constant that depends on the geometry of the perturbed object, as well as analytical expressions to calculate an integral factor that relates the square of the voltage on axis and the electric energy originally stored in the small volume of the perturbed object. The values measured of f0, Δf and Rsh/Q0 are, respectively, 2.86 GHz, − 5.27 MHz and 79.8 Ω. They are also compared with the results simulated by a 3D eigensolver obtaining a good agreement.
{"title":"Rsh/Q0 measurements in klystron cavities","authors":"Robson K. B. e Silva, D. T. Lopes, C. Motta","doi":"10.1109/IMOC.2011.6169312","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169312","url":null,"abstract":"This paper presents the experimental results of Rsh/Q0 measurements in klystron cavities using the perturbation technique. The theory involving this technique results in an expression which depends on the natural frequency f0 and the perturbed frequency shift Δf, both measured using a cylindrical reentrant cavity with offset gap built in the laboratory. In addition, it is used a cylindrical cavity (pill-box) to calculate a constant that depends on the geometry of the perturbed object, as well as analytical expressions to calculate an integral factor that relates the square of the voltage on axis and the electric energy originally stored in the small volume of the perturbed object. The values measured of f0, Δf and Rsh/Q0 are, respectively, 2.86 GHz, − 5.27 MHz and 79.8 Ω. They are also compared with the results simulated by a 3D eigensolver obtaining a good agreement.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114267839","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169304
F. Domingues, A. Rocha, P. André
In this work, we investigate the time to failure and the failure probability of optical fiber submitted to small bent diameter's and high optical powers. The bent diameters under study were 2.9, 3.1 and 3.3mm and the optical powers injected in the bent fiber had the values of 1.0, 1.5 and 2.0 W. For the bending diameter of 3.1 mm the failure probability presented a Weibull parameter of −0.279±0.021 for the optical power of 1.5 W and −1.38±0.158 for the optical power of 1.0 W. For the injected optical power of 2 W the failure probability presented a Weibull parameter of −0.307±0.025 for a bending diameter of 3.1 mm and −0.617±0.036 for a bending diameter of 3.3 mm.
{"title":"Failure probability of optical fiber under high optical power and small bend diameters","authors":"F. Domingues, A. Rocha, P. André","doi":"10.1109/IMOC.2011.6169304","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169304","url":null,"abstract":"In this work, we investigate the time to failure and the failure probability of optical fiber submitted to small bent diameter's and high optical powers. The bent diameters under study were 2.9, 3.1 and 3.3mm and the optical powers injected in the bent fiber had the values of 1.0, 1.5 and 2.0 W. For the bending diameter of 3.1 mm the failure probability presented a Weibull parameter of −0.279±0.021 for the optical power of 1.5 W and −1.38±0.158 for the optical power of 1.0 W. For the injected optical power of 2 W the failure probability presented a Weibull parameter of −0.307±0.025 for a bending diameter of 3.1 mm and −0.617±0.036 for a bending diameter of 3.3 mm.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122820312","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169256
R. Przesmycki, M. Bugaj, L. Nowosielski, M. Wnuk
Intensive development of cellular personal communications system has been observed lately. Thus, protection of a man, and especially protection of his head against non-ionizing electromagnetic radiation generated by cellular telephones is becoming one of the most important problems. The results of elaborated microstrip antennas which have minimized radiation towards the user's head are presented in this paper.
{"title":"Dual-band mobile phone antenna for RF protection of human head","authors":"R. Przesmycki, M. Bugaj, L. Nowosielski, M. Wnuk","doi":"10.1109/IMOC.2011.6169256","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169256","url":null,"abstract":"Intensive development of cellular personal communications system has been observed lately. Thus, protection of a man, and especially protection of his head against non-ionizing electromagnetic radiation generated by cellular telephones is becoming one of the most important problems. The results of elaborated microstrip antennas which have minimized radiation towards the user's head are presented in this paper.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123242180","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169392
C. Bastos-Filho, Adson M. Santos, D. Chaves, J. Martins-Filho
This paper proposes a model and a tool to allow remote and distributed simulation of optical networks using XML. We define how the simulation can be parallelized in order to be quickly processed. We use remote access in order to perform the simulations in multiple processors simultaneously by sending the network and the simulation description coded in XML to the available remote computers. The sequential and distributed simulations modes were compared in two different situations in order to show that we can successfully perform parallel processing in the simulation of optical networks. We achieved a speedup of 7 in a remote simulation running in two Quadcore processors when compared to the previous version of our simulator, which runs in a single core processor.
{"title":"A model to allow remote and distributed simulation of optical networks using XML","authors":"C. Bastos-Filho, Adson M. Santos, D. Chaves, J. Martins-Filho","doi":"10.1109/IMOC.2011.6169392","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169392","url":null,"abstract":"This paper proposes a model and a tool to allow remote and distributed simulation of optical networks using XML. We define how the simulation can be parallelized in order to be quickly processed. We use remote access in order to perform the simulations in multiple processors simultaneously by sending the network and the simulation description coded in XML to the available remote computers. The sequential and distributed simulations modes were compared in two different situations in order to show that we can successfully perform parallel processing in the simulation of optical networks. We achieved a speedup of 7 in a remote simulation running in two Quadcore processors when compared to the previous version of our simulator, which runs in a single core processor.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115742072","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169405
Alisson N. Amaral, U. C. Resende, E. N. Gonçalves
This work presents a mono-objective optimization for a Yagi-Uda antenna applying the ellipsoid algorithm. For problems which the objective function is not known, like function that represents the Yagi-Uda antenna behavior, the ellipsoid algorithm has some features that make it more interesting compared to other optimization methods. To obtain antenna electromagnetic characteristics it is used the electric field integral equation (Pocklington integral equation) numerically evaluated by the Method of Moments (MoM). The ellipsoid optimization leads to antenna geometry with superior directivity than those presented in the available literature.
{"title":"Yagi-Uda antenna optimization by elipsoid algorithm","authors":"Alisson N. Amaral, U. C. Resende, E. N. Gonçalves","doi":"10.1109/IMOC.2011.6169405","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169405","url":null,"abstract":"This work presents a mono-objective optimization for a Yagi-Uda antenna applying the ellipsoid algorithm. For problems which the objective function is not known, like function that represents the Yagi-Uda antenna behavior, the ellipsoid algorithm has some features that make it more interesting compared to other optimization methods. To obtain antenna electromagnetic characteristics it is used the electric field integral equation (Pocklington integral equation) numerically evaluated by the Method of Moments (MoM). The ellipsoid optimization leads to antenna geometry with superior directivity than those presented in the available literature.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132501132","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169369
Faria Maicon, Ferrera Adriano, Dante Carlos, Castaneda S. Zady, E. Hugo
Following the efforts performed in research and development of electromagnetic devices as antennas, optical fibers and microwaves devices we report a careful implementation of the Finite-Difference Time-Domain (FDTD) in a parallel environment. We use Graphic Processor Units (GPUs) to take advantage of FDTD parallel features and observe the time evolution of the electromagnetic fields in a Single Instruction, Multiple Data parallel implementation. It was observe performance gains up to 30 times when this parallel GPU solution are compared with a serial solution in a modern CPU.
{"title":"One and two dimensional devices electromagnetic simulation using parallelism on GPUs","authors":"Faria Maicon, Ferrera Adriano, Dante Carlos, Castaneda S. Zady, E. Hugo","doi":"10.1109/IMOC.2011.6169369","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169369","url":null,"abstract":"Following the efforts performed in research and development of electromagnetic devices as antennas, optical fibers and microwaves devices we report a careful implementation of the Finite-Difference Time-Domain (FDTD) in a parallel environment. We use Graphic Processor Units (GPUs) to take advantage of FDTD parallel features and observe the time evolution of the electromagnetic fields in a Single Instruction, Multiple Data parallel implementation. It was observe performance gains up to 30 times when this parallel GPU solution are compared with a serial solution in a modern CPU.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128490809","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169401
Robson K. B. e Silva, D. T. Lopes, C. Motta
This paper presents some experimental results of unloaded Q-factor, Q0, measurements in klystron cavities using the critical points method. The circuit model and impedance locus involving this method are outlined in order to present the experimental procedure. The values calculated for a typical reentrant S-band klystrons cavity, using a vector network analyzer, were 3394 for the unloaded Q0, 1.2715 for the coupling coefficient and 2.85818GHz for the load resonant frequency.
{"title":"Unloaded Q-factor measurements in klystron cavities","authors":"Robson K. B. e Silva, D. T. Lopes, C. Motta","doi":"10.1109/IMOC.2011.6169401","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169401","url":null,"abstract":"This paper presents some experimental results of unloaded Q-factor, Q0, measurements in klystron cavities using the critical points method. The circuit model and impedance locus involving this method are outlined in order to present the experimental procedure. The values calculated for a typical reentrant S-band klystrons cavity, using a vector network analyzer, were 3394 for the unloaded Q0, 1.2715 for the coupling coefficient and 2.85818GHz for the load resonant frequency.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128119123","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169306
E. Fagotto, M. Abbade
In this work we numerically investigated an all-optical 2R (reamplification and reshaping) regenerator based on four-wave mixing and implemented with two stages of highly nonlinear dispersion-shifted fiber. The two-stage setup, aside from providing an almost ideal transfer function, allows for the regenerated signal to maintain its original wavelength (wavelength shift-free). We tested the device operation by applying to its input an optical signal affected by accumulative amplified spontaneous emission noise from a cascade of erbium-doped fiber amplifiers. To assess the regenerator performance, we calculated and compared the Q-factor and extinction rate of the input signal with the corresponding values for the output signal. Our results show, due to the action of the proposed two-stage wavelength shift-free regenerator, the input signal Q-factor improves by up to 70% and its extinction ratio by up to 3 dB whilst maintaining the input signal carrier frequency.
{"title":"Wavelength shift-free all-optical 2R regenerator based on four-wave mixing","authors":"E. Fagotto, M. Abbade","doi":"10.1109/IMOC.2011.6169306","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169306","url":null,"abstract":"In this work we numerically investigated an all-optical 2R (reamplification and reshaping) regenerator based on four-wave mixing and implemented with two stages of highly nonlinear dispersion-shifted fiber. The two-stage setup, aside from providing an almost ideal transfer function, allows for the regenerated signal to maintain its original wavelength (wavelength shift-free). We tested the device operation by applying to its input an optical signal affected by accumulative amplified spontaneous emission noise from a cascade of erbium-doped fiber amplifiers. To assess the regenerator performance, we calculated and compared the Q-factor and extinction rate of the input signal with the corresponding values for the output signal. Our results show, due to the action of the proposed two-stage wavelength shift-free regenerator, the input signal Q-factor improves by up to 70% and its extinction ratio by up to 3 dB whilst maintaining the input signal carrier frequency.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114407519","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}
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