@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/ibi/8JMKD3MGP3W34R/3UHG4UE",
targetfile = "publicacao.pdf",
urlaccessdate = "18 abr. 2024"
}