Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169418
R. D. Soares, R. Mesquita, F. Moreira
This work describes a meshless method to obtain the electromagnetic characteristics of a monopole placed over a perfectly electric ground plane. The Meshless Local Petrov-Galerkin is used with shape functions generated by Moving Least Squares. Boundary conditions are imposed by a collocation method that does not require any numerical integration. The proposed axisymmetric analysis has a simple implementation and reduced computational effort. The results are in agreement with theoretical data and simulations found in the literature.
{"title":"Electromagnetic axisymmetric analysis of monopole antenna over a perfectly electric ground plane by a Meshless Local Petrov-Galerkin method","authors":"R. D. Soares, R. Mesquita, F. Moreira","doi":"10.1109/IMOC.2011.6169418","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169418","url":null,"abstract":"This work describes a meshless method to obtain the electromagnetic characteristics of a monopole placed over a perfectly electric ground plane. The Meshless Local Petrov-Galerkin is used with shape functions generated by Moving Least Squares. Boundary conditions are imposed by a collocation method that does not require any numerical integration. The proposed axisymmetric analysis has a simple implementation and reduced computational effort. The results are in agreement with theoretical data and simulations found in the literature.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"102 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":"132633899","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.2011.6169330
C. Vicente, V. Fernandes, Carlos Marques, P. Marques, E. Pecoraro, Rogério N. Nogueira, Luis D. Carlos, Rute A. S. Ferreira, P. André
High-rejection optical filters (~ 20 dB) based on first-order Bragg gratings inscribed in channel waveguides were fabricated using UV-laser direct-write method in sol-gel derived organic-inorganic hybrids, so-called di-ureasils, processed as good-optical quality thin films on oxidized silicon substrates. The gratings were designed to operate at communication wavelengths of 1550 nm demonstrating the great potential of sol-gel technology in the integration of optoelectronic components.
{"title":"High-rejection optical filters patterned on organic-inorganic hybrids using UV laser direct writing","authors":"C. Vicente, V. Fernandes, Carlos Marques, P. Marques, E. Pecoraro, Rogério N. Nogueira, Luis D. Carlos, Rute A. S. Ferreira, P. André","doi":"10.1109/IMOC.2011.6169330","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169330","url":null,"abstract":"High-rejection optical filters (~ 20 dB) based on first-order Bragg gratings inscribed in channel waveguides were fabricated using UV-laser direct-write method in sol-gel derived organic-inorganic hybrids, so-called di-ureasils, processed as good-optical quality thin films on oxidized silicon substrates. The gratings were designed to operate at communication wavelengths of 1550 nm demonstrating the great potential of sol-gel technology in the integration of optoelectronic components.","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":"133365468","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.2011.6169377
S. Bezerra, H. A. Cabral, M. T. de Melo
A new method for developing UMTS filters for upload and download bands is proposed. The filters are based on a periodical resonator called the H-type resonator. Simulation results show that the relative mean error is less than 1.5%. The filter designed by this method has an insertion loss less than 1dB and provides low return loss in the bandpass. A periodic network analysis was used for designing the H-type resonator. We have also derived a lumped-element circuit model for the filter whose element's values are found by using genetic algorithms. It is shown that the filter has a suitable frequency response, and that it can be applied quite well in telecommunication systems.
{"title":"A new procedure for developing UMTS filters based on periodic structures","authors":"S. Bezerra, H. A. Cabral, M. T. de Melo","doi":"10.1109/IMOC.2011.6169377","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169377","url":null,"abstract":"A new method for developing UMTS filters for upload and download bands is proposed. The filters are based on a periodical resonator called the H-type resonator. Simulation results show that the relative mean error is less than 1.5%. The filter designed by this method has an insertion loss less than 1dB and provides low return loss in the bandpass. A periodic network analysis was used for designing the H-type resonator. We have also derived a lumped-element circuit model for the filter whose element's values are found by using genetic algorithms. It is shown that the filter has a suitable frequency response, and that it can be applied quite well in telecommunication systems.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"99 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":"115173800","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.2011.6169376
Victor S. C. Teichmann, A. Barreto, D. Mello
The widespread deployment of optical interconnects in data centers has renewed the interest in multimode fiber communications. Due to the complexity of modern transmission techniques, performance analysis relies on numerical simulations that require an accurate channel model to reflect reality with the needed precision. As there is no standard model for channel simulation, we investigate a deterministic, a statistical and the Cambridge 108 Fiber model for derivation of the multimode fiber (MMF) impulse response. Numerical simulations are performed in order to calculate the 3-dB bandwidth for each model. We show that the Cambridge model is generally a compromise between the statistical and the theoretical model, which seem to represent a pessimistic and an optimistic scenarios, respectively.
{"title":"Analysis of multimode fiber impulse response simulation models","authors":"Victor S. C. Teichmann, A. Barreto, D. Mello","doi":"10.1109/IMOC.2011.6169376","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169376","url":null,"abstract":"The widespread deployment of optical interconnects in data centers has renewed the interest in multimode fiber communications. Due to the complexity of modern transmission techniques, performance analysis relies on numerical simulations that require an accurate channel model to reflect reality with the needed precision. As there is no standard model for channel simulation, we investigate a deterministic, a statistical and the Cambridge 108 Fiber model for derivation of the multimode fiber (MMF) impulse response. Numerical simulations are performed in order to calculate the 3-dB bandwidth for each model. We show that the Cambridge model is generally a compromise between the statistical and the theoretical model, which seem to represent a pessimistic and an optimistic scenarios, respectively.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"2 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":"115443140","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.2011.6169319
B. Angeli, E. Mobilon, A. Bordonalli, E. I. de Betou
This paper presents the design and development of an optical burst mode receiver for next generation passive optical network based on commercially integrated circuits, as well as the prototype performance regarding the loud/soft ratio imposed by the network. An experimental test setup was arranged for performance and characterization purposes, with results well within network general specification.
{"title":"2.5 Gbits/s burst mode receiver for NG-PON","authors":"B. Angeli, E. Mobilon, A. Bordonalli, E. I. de Betou","doi":"10.1109/IMOC.2011.6169319","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169319","url":null,"abstract":"This paper presents the design and development of an optical burst mode receiver for next generation passive optical network based on commercially integrated circuits, as well as the prototype performance regarding the loud/soft ratio imposed by the network. An experimental test setup was arranged for performance and characterization purposes, with results well within network general specification.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"141 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":"124484202","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.2011.6169275
A. Ximenes, J. Swart
The exponential growth of wireless communication in portable device market has been increasing the demand for very flexible RF transceivers, including the ability of communicating in an unpredictable environment, from very weak to highly powered signal levels without losing its functionality. In this paper we present an automatic continuous gain control CMOS receiver for 2.4GHz ISM band with minimum NF of 1.45dB at highest gain mode, ICP of −9dBm at lowest gain mode, and gain variation of 30dB, from 40dB to 10dB. It contains a continuous variable gain LNA, a down-conversion Mixer and a RMS-detector consuming 30mW under 1.8V power supply.
{"title":"Analog automatic gain control (AGC) CMOS WLAN direct conversion receiver (DCR)","authors":"A. Ximenes, J. Swart","doi":"10.1109/IMOC.2011.6169275","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169275","url":null,"abstract":"The exponential growth of wireless communication in portable device market has been increasing the demand for very flexible RF transceivers, including the ability of communicating in an unpredictable environment, from very weak to highly powered signal levels without losing its functionality. In this paper we present an automatic continuous gain control CMOS receiver for 2.4GHz ISM band with minimum NF of 1.45dB at highest gain mode, ICP of −9dBm at lowest gain mode, and gain variation of 30dB, from 40dB to 10dB. It contains a continuous variable gain LNA, a down-conversion Mixer and a RMS-detector consuming 30mW under 1.8V power supply.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"135 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":"124194714","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.2011.6169329
L. Negri, Guilherme Zilli, Cleberson da Cunha, A. Ramos, H. Kalinowski, J. L. Fabris, A. Paterno
This work reports the simultaneous use of electrical impedance spectroscopy and fiber Bragg grating (FBG) refractive index sensing in the estimation of the main components of specific fuel mixtures. Fuel samples containing gasoline, dehydrated ethanol, diesel, and kerosene were analyzed. Electrical impedance spectra and FBG sensor signals were registered for each mixture. Artificial Neural Networks (ANN) were used to estimate the ethanol concentration using the information from both sensors separately and to illustrate the methodology of fusing data from sensors that measure electrical permittivity at different frequency ranges, namely, an electrical impedance sensor and the etched FBG refractometric sensor. The behavior of the ANN to fuse data and the individual analysis of the sensor signals indicated that the joint use of the proposed techniques enhance the fuel estimation quality when compared to the usage of a singleton sensor.
{"title":"FBG refractometry and electrical impedance analysis in fuel samples characterization","authors":"L. Negri, Guilherme Zilli, Cleberson da Cunha, A. Ramos, H. Kalinowski, J. L. Fabris, A. Paterno","doi":"10.1109/IMOC.2011.6169329","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169329","url":null,"abstract":"This work reports the simultaneous use of electrical impedance spectroscopy and fiber Bragg grating (FBG) refractive index sensing in the estimation of the main components of specific fuel mixtures. Fuel samples containing gasoline, dehydrated ethanol, diesel, and kerosene were analyzed. Electrical impedance spectra and FBG sensor signals were registered for each mixture. Artificial Neural Networks (ANN) were used to estimate the ethanol concentration using the information from both sensors separately and to illustrate the methodology of fusing data from sensors that measure electrical permittivity at different frequency ranges, namely, an electrical impedance sensor and the etched FBG refractometric sensor. The behavior of the ANN to fuse data and the individual analysis of the sensor signals indicated that the joint use of the proposed techniques enhance the fuel estimation quality when compared to the usage of a singleton sensor.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"95 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":"128577061","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.2011.6169221
A. Pasquazi, M. Peccianti, B. Little, S. Chu, R. Morandotti, J. Azaña, D. Moss
We report a CMOS-compatible monolithic device for the amplitude and phase characterization of ultrafast optical pulses based on FWM, working up to 1THz bandwidth and 100ps time-duration thanks to a new phase-recovery algorithm for X-SPIDER.
{"title":"Measurement of high time-bandwidth pulses on a chip with a phase sensitive optical oscilloscope","authors":"A. Pasquazi, M. Peccianti, B. Little, S. Chu, R. Morandotti, J. Azaña, D. Moss","doi":"10.1109/IMOC.2011.6169221","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169221","url":null,"abstract":"We report a CMOS-compatible monolithic device for the amplitude and phase characterization of ultrafast optical pulses based on FWM, working up to 1THz bandwidth and 100ps time-duration thanks to a new phase-recovery algorithm for X-SPIDER.","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":"124535839","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.2011.6169349
V. A. Machado, C. N. Silva, R. J. M. Silva, B. S. L. Castro, I. R. Gomes, C. R. L. Frances, G. P. S. Cavalcante, J. C. W. A. Costa
This paper presents a propagation model for prediction of path loss and performance parameters (throughput and frame loss) on OFDM-based networks. For this study, measurements on a 5.8 GHz Wimax network were carried out. The proposed model parameters have been adjusted by LS (Least Squares) optimization, using measured data as reference. The results show that the proposed model has a good agreement with the measurements. Futures works can consider an adjustment for a set of frequencies. For this purpose, extensive measurements campaigns will be carried out.
{"title":"Cross layer model to predict performance parameters on OFDM-based wireless networks","authors":"V. A. Machado, C. N. Silva, R. J. M. Silva, B. S. L. Castro, I. R. Gomes, C. R. L. Frances, G. P. S. Cavalcante, J. C. W. A. Costa","doi":"10.1109/IMOC.2011.6169349","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169349","url":null,"abstract":"This paper presents a propagation model for prediction of path loss and performance parameters (throughput and frame loss) on OFDM-based networks. For this study, measurements on a 5.8 GHz Wimax network were carried out. The proposed model parameters have been adjusted by LS (Least Squares) optimization, using measured data as reference. The results show that the proposed model has a good agreement with the measurements. Futures works can consider an adjustment for a set of frequencies. For this purpose, extensive measurements campaigns will be carried out.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"139 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":"124787257","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.2011.6169258
J. Carmo, J. Correia
This paper presents a frequency synthesizer for the frequency of 2.4 GHz, which were designed to present a reduced level of reference frequency spurs. Parts of the synthesizer were fabricated in a standard 0.18 μm CMOS process, whose architecture is based on a Phase-Locked Loop (PLL) with an integer divider in the feedback loop and was designed to work with a voltage supply of only 1.8 V. Some building blocks are reused thus the novelty of this paper is presenting a PLL with two new blocks for reducing the magnitude of spurs of the process, e.g., a sample-and-hold circuit and a quantizer circuit (with N quantizing levels). The PLL behaviour was simulated for a few number of levels — N={32, 64, 128} — and for a variety of loop-filters. As showed by the simulations, the quantizations provide an additional reduction of the reference-frequency spurs into the output of the PLL. Moreover, the locking time is kept low even after including the two new circuit blocks in the loop
{"title":"PLL at 2.4 GHz with reduced reference spurs","authors":"J. Carmo, J. Correia","doi":"10.1109/IMOC.2011.6169258","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169258","url":null,"abstract":"This paper presents a frequency synthesizer for the frequency of 2.4 GHz, which were designed to present a reduced level of reference frequency spurs. Parts of the synthesizer were fabricated in a standard 0.18 μm CMOS process, whose architecture is based on a Phase-Locked Loop (PLL) with an integer divider in the feedback loop and was designed to work with a voltage supply of only 1.8 V. Some building blocks are reused thus the novelty of this paper is presenting a PLL with two new blocks for reducing the magnitude of spurs of the process, e.g., a sample-and-hold circuit and a quantizer circuit (with N quantizing levels). The PLL behaviour was simulated for a few number of levels — N={32, 64, 128} — and for a variety of loop-filters. As showed by the simulations, the quantizations provide an additional reduction of the reference-frequency spurs into the output of the PLL. Moreover, the locking time is kept low even after including the two new circuit blocks in the loop","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"4 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":"130199154","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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