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Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)最新文献

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Beam steering technique through multiple Vee-antenna switching: Additional reflector element and radiation pattern characterization 通过多个vee天线切换的波束引导技术:附加反射器元件和辐射方向图表征
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244892
L. Kretly, A.S. A Tavora, S. Barbin
{"title":"Beam steering technique through multiple Vee-antenna switching: Additional reflector element and radiation pattern characterization","authors":"L. Kretly, A.S. A Tavora, S. Barbin","doi":"10.1109/IMOC.2003.1244892","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244892","url":null,"abstract":"Two prototypes of reconfigurable antenna structure applicable to 3G communication systems are presented in this paper. The first one was designed to operate at 2.45 GHz and to steer the radiation beam from 60/spl deg/ to 120/spl deg/ with a step of 5/spl deg/, by reconfiguring the feed elements. The second antenna is a V-antenna array with resonance frequency at 1.9 GHz and was constructed to full characterize the radiation pattern of this type of antenna.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121725440","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
Reduction of the radar cross section of a moderate cylindrical structure using central impedance loading 利用中心阻抗载荷减小中等圆柱形结构的雷达横截面
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244904
O.M. Braga Filho, A.J. de Faro Orlando, Antonio C. C. Migliano
{"title":"Reduction of the radar cross section of a moderate cylindrical structure using central impedance loading","authors":"O.M. Braga Filho, A.J. de Faro Orlando, Antonio C. C. Migliano","doi":"10.1109/IMOC.2003.1244904","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244904","url":null,"abstract":"A theoretical study on the minimization of the radar cross section (RCS) of a cylindrical structure of moderate radius centrally loaded by a lumped impedance that is illuminated by a plane electromagnetic wave at normal broadside incidence is presented. Expressions for the induced current on the surface of the cylinder and for the RCS are obtained, and an equation for the optimum loading impedance that minimizes the RCS for moderate cylinders is also derived. The reduction of the RCS is achieved because the impedance that centrally loads the cylinder reduces the superficial current and consequently the RCS. The current and impedance equations are derived using the Hallen' method for calculating the current distribution in antennas. Computed curves of the induced current distribution in the cylinder and of the RCS are presented and experimental results for moderate impedance loading of dipoles not much longer than /spl lambda//2 are compared with the theoretical computations. For such dipoles, the broadside RCS can be reduced by 30 to 40 dB with appropriate passive center loading.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121829929","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: 4
38dB gain from a double-pass single-pump thulium doped fiber amplifier 双通单泵浦掺铥光纤放大器获得38dB增益
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244844
C. Bastos-Filho, J. Martins-Filho, A. Gomes
{"title":"38dB gain from a double-pass single-pump thulium doped fiber amplifier","authors":"C. Bastos-Filho, J. Martins-Filho, A. Gomes","doi":"10.1109/IMOC.2003.1244844","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244844","url":null,"abstract":"We demonstrate a 38 dB gain thulium doped fiber amplifier pumped by 400 mW at 1050 nm that uses a reflective double-pass configuration. The gain enhancement is 16 dB and the maximum noise figure penalty is 2 dB for the double-pass compared to single-pass operation. We also compare the performance of two configurations of double-pass operation, with a mirror and with a circulator as the reflector.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129757322","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
Double pass L band erbium doped fiber amplifier with an embedded DCF 带嵌入式DCF的双通L波段掺铒光纤放大器
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244843
J. Rosolem, M. de Barros, A. Juriollo, M.R. Horluchi
{"title":"Double pass L band erbium doped fiber amplifier with an embedded DCF","authors":"J. Rosolem, M. de Barros, A. Juriollo, M.R. Horluchi","doi":"10.1109/IMOC.2003.1244843","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244843","url":null,"abstract":"We present gain, noise figure and 10 Gbit/s BER characterization of a double pass L band erbium doped fiber amplifier that incorporate a DCF module for chromatic dispersion compensation.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114255576","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
Analysis of planar antenna array 平面天线阵分析
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244879
J. Neto, G. Oliveira, H. Fernandes
{"title":"Analysis of planar antenna array","authors":"J. Neto, G. Oliveira, H. Fernandes","doi":"10.1109/IMOC.2003.1244879","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244879","url":null,"abstract":"The TTL (transversal transmission line) method is applied to the analysis of patch resonator, as a planar antenna. A set of equations that represents the electromagnetic fields in the x and z direction as function of the electric field in the y direction are obtained. This method is very suitable at microwave and antenna applications, and gives accurate complex resonant frequency which contributes to obtain higher precision antenna parameters. For each type of array is calculated the array factor, considering the excitation, phase and the relative displacement between the elements as well as the dimensions and number of elements.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121178280","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
Behavioral effects of microwave radiation on Rattus norvegicus 微波辐射对褐家鼠行为的影响
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244881
A.K.R. Lopes, D. Dantas, M. Carvalho, M.S. de Alencar, S. Nain
{"title":"Behavioral effects of microwave radiation on Rattus norvegicus","authors":"A.K.R. Lopes, D. Dantas, M. Carvalho, M.S. de Alencar, S. Nain","doi":"10.1109/IMOC.2003.1244881","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244881","url":null,"abstract":"This paper presents a preliminary analysis of the behavioral effects, specially the learning difficulties, verified in rats of the species Rattus norvegicus, submitted to microwave radiation. Throughout the tests, an analog transmitter was used operating in the frequency of 850 MHz during a daily period of one hour. The choice of that frequency, in particular, links to the fact that in Brazil, the cellular phones use radiofrequency carriers between 800 and 900 MHz for the mobile phone service (cellular mobile service). The analysis, based on experiments with the Skinner Cage, had as main objective to verify the possible alterations on the learning ability in adult rats subjected to the influence of non-ionizing radiation and to compare their answer ratio with the control group, exempt of the influence of radiation.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126962508","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
Ferroelectric domain inversion in congruent lithium niobate 同位铌酸锂的铁电畴反转
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244903
F. Yazdani, M. Sundheimer, A. Gomes
{"title":"Ferroelectric domain inversion in congruent lithium niobate","authors":"F. Yazdani, M. Sundheimer, A. Gomes","doi":"10.1109/IMOC.2003.1244903","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244903","url":null,"abstract":"We present results of ferroelectric domain inversion studies in congruent lithium niobate which clarify some important aspects of the dynamics of the process such as the alignment of the internal electric field, initiation of poling, switching time, conditions for spontaneous backswitching and stabilization of inverted domains, and the influence of the impedance of the poling apparatus. These results are of practical interest for designing poling processes for the fabrication of periodically-poled lithium niobate.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114603668","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
Radar cross section reduction of dihedral and trihedral comer reflectors coated with radar absorbing materials (8-12 GHz) 涂覆雷达吸波材料的二面体和三面体角反射镜雷达截面积减小(8-12 GHz)
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244907
E. Nohara, M.A.S. Miacci, G. G. Peixoto, I. M. Martin, M. C. Rezende
{"title":"Radar cross section reduction of dihedral and trihedral comer reflectors coated with radar absorbing materials (8-12 GHz)","authors":"E. Nohara, M.A.S. Miacci, G. G. Peixoto, I. M. Martin, M. C. Rezende","doi":"10.1109/IMOC.2003.1244907","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244907","url":null,"abstract":"Corner reflectors form the major scattering centers in the radar signatures of ships, aircraft and vehicles. The radar cross section (RCS) reduction of these \"flare spots\" (corner reflectors) plays an important role in the design of these targets with reduced detectability in radar. This paper deals with the RCS reduction of square dihedral and trihedral corner reflectors, coated with radar absorbing material (RAM). The measurements were carried out in an anechoic chamber at Centro Tecnico Aeroespacial (CTA)-Ministerio da Defesa facilities, and the RAM coating was manufactured at Divisao de Materiais of Instituto de Aeronautica e Espaao (IAE)/CTA. The processed RAM applied on a flat plate was evaluated by reflection coefficient measurements by using the RCS self-calibrated technique.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130877994","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
Broadband 4-bit digital phase shifter based on vector combining method 基于矢量组合法的宽带4位数字移相器
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244824
J. Ryoo, S.H. Oh
{"title":"Broadband 4-bit digital phase shifter based on vector combining method","authors":"J. Ryoo, S.H. Oh","doi":"10.1109/IMOC.2003.1244824","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244824","url":null,"abstract":"This paper presents the design and experimental results of a new broadband 4-bit digital phase shifter, based on a vector combining method. The circuits consist of an asymmetric coupled line coupler, PIN diode attenuator, symmetric coupled line coupler, and Wilkinson power combiner. The measured results exhibits a maximum RMS phase error of about 7.9 degrees and a maximum RMS amplitude error less than 1.5 dB across the frequency band from 1 GHz-3 GHz. Typical insertion loss is 16.5 dB, mean input return loss is 14.5 dB, and mean output return loss is 12 dB.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"812 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129360342","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
RF characterization of low-voltage high-isolation MEMS series switch based on a S-shaped film actuator 基于s型薄膜作动器的低压高隔离MEMS系列开关射频特性研究
Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678) Pub Date : 2003-11-17 DOI: 10.1109/IMOC.2003.1244917
J. Oberhammer, B. Lindmark, G. Stemme
{"title":"RF characterization of low-voltage high-isolation MEMS series switch based on a S-shaped film actuator","authors":"J. Oberhammer, B. Lindmark, G. Stemme","doi":"10.1109/IMOC.2003.1244917","DOIUrl":"https://doi.org/10.1109/IMOC.2003.1244917","url":null,"abstract":"This paper presents on an electrostatically actuated microelectromechanical series switch for DC to RF signals, based on a flexible S-shaped film actuator moving between two electrodes in touch mode actuation. This novel concept, in contrast to most other MEMS switches, allows a low actuation voltage design independent on the off-state gap height, which makes larger switching contact areas for low insertion loss and higher current handling capability possible, by obtaining high isolation. Furthermore, the double anchor principle avoids self-biasing and is favorable of switching higher power signals. The actuation voltages of the first prototype switches are 12 V to open and 15.8 V to close the metal contact. The RF isolation with a gap distance of 14.2 /spl mu/m is better than -45 dB up to 2 GHz and -30 dB at 15 GHz despite a large switching contact area of 3500 /spl mu/m/sup 2/.","PeriodicalId":156662,"journal":{"name":"Proceedings of the 2003 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003. (Cat. No.03TH8678)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125925187","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
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