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@MastersThesis{Silva:2020:GeRFUs,
               author = "Silva, Leandro Carvalho",
                title = "Gera{\c{c}}{\~a}o de RF usando linhas de transmiss{\~a}o 
                         n{\~a}o lineares discretas para aplica{\c{c}}{\~o}es radar",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2020",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2019-12-05",
             keywords = "linha de transmiss{\~a}o n{\~a}o linear, radiofrequ{\^e}ncia, 
                         diodo varicap, s{\'o}liton, radar, nonlinear transmission line, 
                         radio frequency, varactor diode, soliton, radar.",
             abstract = "As Linhas de Transmiss{\~a}o N{\~a}o Lineares (LTNLs) v{\^e}m 
                         sendo estudadas para a gera{\c{c}}{\~a}o de sinais de 
                         radiofrequ{\^e}ncias (RF) para diversas aplica{\c{c}}{\~o}es, 
                         como radares aeroespaciais, sistemas de ataque eletr{\^o}nico, 
                         telecomunica{\c{c}}{\~o}es e equipamentos eletrom{\'e}dicos. 
                         Contudo, poucos trabalhos apresentaram resultados experimentais 
                         relacionados {\`a}s t{\'e}cnicas de extra{\c{c}}{\~a}o dos 
                         sinais de RF da linha, bem como a transmiss{\~a}o e a 
                         recep{\c{c}}{\~a}o de sinais de RF atrav{\'e}s de antenas. 
                         Embora a maioria dos estudos esteja concentrada em LTNLs de alta 
                         pot{\^e}ncia, um experimento de baixa tens{\~a}o permite a 
                         constru{\c{c}}{\~a}o de LTNLs compactas utilizando componentes 
                         Commercial-off-the-shelf (COTS), que podem ser caracterizadas por 
                         meio de medi{\c{c}}{\~o}es com boa precis{\~a}o em 
                         laborat{\'o}rio. Esse tipo de experimento permite a 
                         investiga{\c{c}}{\~a}o das caracter{\'{\i}}sticas de 
                         propaga{\c{c}}{\~a}o dos s{\'o}litons gerados, tais como atraso 
                         de tempo, largura do pulso, frequ{\^e}ncia e n{\'u}mero de 
                         oscila{\c{c}}{\~o}es. Tendo em vista que diversas 
                         aplica{\c{c}}{\~o}es para as LTNLs requerem a 
                         gera{\c{c}}{\~a}o e irradia{\c{c}}{\~a}o de sinais de RF, esta 
                         disserta{\c{c}}{\~a}o teve o objetivo de apresentar um estudo 
                         experimental com LTNLs capacitivas de baixa tens{\~a}o, que foram 
                         projetadas, simuladas, constru{\'{\i}}das e testadas em 
                         laborat{\'o}rio. Os projetos das LTNLs foram validados por 
                         simula{\c{c}}{\~o}es com o software LTspice, e as linhas foram 
                         constru{\'{\i}}das em placas de circuito impresso com indutores 
                         comerciais e diodos varicaps como elementos n{\~a}o lineares. Os 
                         sinais de RF foram extra{\'{\i}}dos atrav{\'e}s de circuitos de 
                         desacoplamento conectados na sa{\'{\i}}da da linha, como casador 
                         de imped{\^a}ncias e filtro passa-alta. Este trabalho apresenta 
                         como resultado in{\'e}dito a gera{\c{c}}{\~a}o de sinais de RF 
                         atingindo a frequ{\^e}ncia de 280 MHz utilizando LTNL capacitiva. 
                         Esses sinais foram perfeitamente transmitidos e recebidos 
                         atrav{\'e}s de antenas. Portanto este estudo tem como principal 
                         contribui{\c{c}}{\~a}o cient{\'{\i}}fica a 
                         comprova{\c{c}}{\~a}o da capacidade de gera{\c{c}}{\~a}o e 
                         irradia{\c{c}}{\~a}o de sinais de RF atrav{\'e}s de LTNLs para 
                         prospectivas aplica{\c{c}}{\~o}es radar. ABSTRACT: Nonlinear 
                         Transmission Lines (NLTLs) have been studied for the generation of 
                         radio frequency (RF) signals for various applications such as 
                         aerospace radars, electronic attack systems, telecommunications, 
                         and electro-medical equipment. However, few studies have presented 
                         experimental results related to the line RF signal extraction 
                         techniques, as well as the transmission and reception of RF 
                         signals using antennas. Although most studies focus on high-power 
                         NLTLs, a low-voltage experiment allows the construction of compact 
                         NLTLs built with commercial-off-the-shelf (COTS) components, which 
                         can be characterized in the laboratory by accurate measurements. 
                         This type of experiment allows the investigation of the 
                         propagation characteristics of the generated solitons, such as 
                         time delay, pulse width, frequency and number of oscillations. 
                         Given that several applications for NLTLs require RF signal 
                         generation and irradiation, this dissertation aimed to present a 
                         study conducted through experiments using low voltage capacitive 
                         NLTLs, which were designed, simulated, built and tested in the 
                         laboratory. NLTL designs were validated through simulations using 
                         LTspice software and the lines were built on printed circuit 
                         boards with commercial inductors and varicaps diodes as nonlinear 
                         elements. The RF signals were extracted through decoupling 
                         circuits connected at the line output, such as an impedance 
                         matching and high-pass filter. This work presents as a new result 
                         the generation of RF signals reaching the frequency of 280 MHz 
                         using a capacitive NLTL. These signals were perfectly transmitted 
                         and received using antennas. So this study has as the main 
                         scientific contribution the ability proof of generating and 
                         irradiating RF signals through LTNLs for prospective radar 
                         applications.",
            committee = "Loureiro, Geilson (presidente) and Rossi, Jos{\'e} Osvaldo 
                         (orientador) and Rangel, Elizete Gon{\c{c}}alves Lopes 
                         (orientadora) and Castro, Joaquim Jos{\'e} Barroso de and Silva 
                         Neto, Lauro Paulo da",
         englishtitle = "RF generation using discrete nonlinear transmission lines for 
                         radar applications",
             language = "pt",
                pages = "94",
                  ibi = "8JMKD3MGP3W34R/3UHG4UE",
                  url = "http://urlib.net/rep/8JMKD3MGP3W34R/3UHG4UE",
           targetfile = "publicacao.pdf",
        urlaccessdate = "2021, Feb. 26"
}


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