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Magnetic fields of an underground coaxial cable caused by return currents in the earthSiegel, Thomas A. January 1989 (has links)
No description available.
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[en] APPLICATION OF THE METHOD OF MOMENTS IN THE ANALYSIS OF MICROSTRIP ANTENNAS / [pt] APLICAÇÃO DO MÉTODO DOS MOMENTOS NA ANÁLISE DE ANTENAS MICROFITAMARIANA GUIMARAES PRALON 09 October 2012 (has links)
[pt] Neste trabalho, o Método dos Momentos é aplicado na análise de antenas
microfita excitadas por cabo coaxial, utilizando Funções de Green no
modelamento dos campos no interior da camada de dielétrico, o que permite
considerar as ondas de superfície excitadas no substrato. Para obter a impedância
de entrada da antena microfita, foi implementado um algoritmo numérico para a
solução do problema. Neste trabalho, atenção especial é dada à análise de
singularidades e ao comportamento assintótico dos integrandos envolvidos na
solução numérica do problema. A validação do algoritmo é feita através da
comparação com resultados apresentados em referências. Os resultados
fornecidos pelo Método dos Momentos são comparados com os obtidos na
aplicação de outros métodos na solução do problema. Para esta comparação, são
utilizados dois programas comerciais de simulação eletromagnética, o Ansoft
HFSS e o CST. São feitas simulações com a variação dos parâmetros de entrada
do problema, com o objetivo de assegurar a convergência dos resultados e
permitir a comparação com os resultados obtidos pelo Método dos Momentos.
São apresentadas diferenças entre os resultados obtidos pelos diversos métodos e
analisadas as possíveis causas das discrepâncias. / [en] In the present work, the Method of Moments is applied to the analysis of
probe fed antennas. The approach uses Green Functions to model the fields
within the dielectric layer, which allows to take into account the surface waves
excited in the substrate. A numerical algorithm was implemented in order to
obtain the microstrip antenna input impedance. The latter is then verified
through the comparison with results presented in references. Special attention is
given to the analysis of singularities and to the asymptotic behavior of the
integrands involved in the numerical solution. A comparison is drawn between
the results obtained with the Method of Moments and those obtained with other
methods by employing two electromagnetic simulation commercial softwares,
Ansoft HFSS and CST. Simulations with different input parameters are
performed in order to ensure convergence of the results and allow comparison
with results obtained by the Method of Moments. The differences among the
results obtained by the several methods addressed in the analysis are presented
and the potential causes of them are analyzed.
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An empirical study of SD signal delay versus temperature in a plenum grade coaxial cableKaur, Sukhdeep 14 February 2012 (has links)
A high resolution speedy delivery time domain reflectometer (SD/TDR) has been developed in the Electrical Engineering department at The University of Texas at Austin. The SD/TDR uses a novel non-sinusoidal signal that does not undergo dispersion during transmission in a lossy media. SD/TDR is used to estimate the length and detect the location of faults in the transmission lines. Time of flight (TOF) is one of the critical parameters of SD/TDR and a function of several temperature dependent factors. Given the TOF and length of a transmission line, signal delay can be computed. This research presents an empirical study of the effect of temperature on the TOF in a plenum grade coaxial cable for temperatures ranging from -3 °C to 60 °C. We also study the effect of temperature on characteristic impedance of the coaxial cable. Finally, a SD double exponential waveform is used to estimate TOF for calibrated short and open terminations. / text
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Spektrální analyzátor N1996A-503 a nejistoty měření / Spectrum Analyser N1996A-503 and Measurement UncertaintyTrojan, Martin January 2011 (has links)
The main target of this master’s thesis is to introduce the reader with the spectrum analyzer, Agilent N1996A CSA. This work explains all the functions of this measuring instrument, control elements and presents some technical parameters. The next part of this thesis deals with the measurement of coaxial cables, so that is why a whole chapter is devoted to coaxial cables and conductors in general. The rest of this thesis deals with issues of measurement uncertainties. This part contains the general procedure for the evaluation of uncertainty, followed by a practical part. The practical part contains measurement of distance to fault and return loss. Measurements were made on 4 samples of coaxial cable. At the end of the practical parts the measured values including the uncertainties and results are summarized in the final paragraph.
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Studies on Dielectric Constants of Liquids at Microwave Frequencies by a Novel Coaxial Cable Fabry-Perot Interferometer SensorZeng, Shixuan January 2018 (has links)
No description available.
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[pt] ANÁLISE COMPARATIVA ENTRE SISTEMAS DE TRANSMISSÃO EM CABO COAXIAL E ENLACES RADIOELÉTRICOS EM VISIBILIDADE / [en] COMPARATIVE ANALYSIS OF TRANSMISSION SYSTEMS USING COAXIAL CABLE AND MICROWAVES LINE-OF-SIGHTALEXANDRE DE REZENDE CAMINHA 12 February 2008 (has links)
[pt] Este trabalho examina, sob o enfoque de custos, de
investimento e operação, dois sistemas de telecomunicações
usualmente empregados no estabelecimento da ligação entre
dois pontos: sistema de transmissão por cabo coaxial e
sistema de transmissão em microondas em visibilidade. Cada
sistema está dividido em suas partes componentes, cujos
custos são levantados. Calculados estes em ambos os
sistemas, define-se uma grandeza que os relaciona. Um
sistema é apresentado a partir do número de canais e do
comprimento do enlace, ficando perfeitamente caracterizado
qual dos sistemas de transmissão é mais econômico, de
acordo com o critério de decisão adotado. / [en] This work examines two telecomunications systems which are
usually used in the establishment and operation - the
transmission system by coaxial cable and the transmission
system by microwaves line-of-sight. Both are divided in
their campontent parts, which calculation in surveyd.
After the surveying of costs of both system, one can
define a relating magnitude. The moment a system is
defined, considering the number of system is the most
economic, according to the adopted criterion of decision.
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Metal-Ceramic Coaxial Cable Sensors for Distributed Temperature MonitoringTrontz, Adam J. 04 September 2018 (has links)
No description available.
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Systém pro přesné měření elektrické délky koaxiálních kabelů / System for Precise Measurement of Electrical Length of Coaxial CablesPodr, Michal January 2015 (has links)
This thesis describes a study of the measuring methods determining the electrical length of coaxial cable without using a vector network analyzer. First, a general theory of management and its various parameters is briefly discussed. This section is focused more specifically on the coaxial cable and its parameters. The next part is graphically analyzed process considerations in the design of measurement methods and outlined the block structure of the system. The third section describes the working process, prototype testing of the bridge, its measurement and design of the measuring system. In the fourth part the software is described. In conclusion, the results of the work are discussed, accuracy of the measurement system, the obtained parameters chosen with regard to the principle of the measurement system and the overall evaluation of the applicability in practice.
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Novel High Frequency Electromagnetic Shielding Measurements Within Functional Geometries Using Non-Metal and Fatigued ConductorsWhite, Ashley 28 August 2017 (has links)
No description available.
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Transient Voltage Distribution in BushingKhan, Md Nazmus Shakib January 2020 (has links)
An electrical bushing is one of the most important elements in a power transformer. Steep front surges such as transient impulse voltage from lightning strikes is an inevitable electromagnetic transient mostly happening in power transmission and distribution system. The bushing might lead to be degraded due to such kind of surge. This project deals with overvoltage stress distribution on the transformer bushing under the effect of electromagnetic transient response such as lightning impulse. To understand the behavior of transient response on the bushing, a proper model of power transformer bushing is built-in Comsol multiphysics to authenticate the stress distribution. The electromagnetic wave of impulse propagates onto the overhead line that connects with the transformer. Some understanding of the transient behavior of a conductor bushing has been achieved through studying the influence of inductance property and the skin effect characteristics of a multi-layer coaxial cable on the wave propagation, which has been structured in this project to simplify the model. On the other hand, the skin effect analysis on the conductor of the bushing has been taken also into account in this project using real conductor simulation in the Comsol model. Thus, it will be interesting to compare the real conductor model with the perfect conductor of the bushing through analyzing the current density effect on it. In this project, multi-layer of coaxial cable and transformer bushing are simulated. The simulation is carried out for time domain and frequency domain in Comsol based on the model characteristics. / En elektrisk genomföring är ett av de viktigaste elementen i en transformator. Spänningsvågor med branta fronter som impulsspänningar från blixtnedslag är ett oundvikligt elektromagnetiskt övergående fenomen som oftast sker i kraftöverförings- och distributionssystem. Genomföringen kan leda till att degraderas på grund av en sådan våg. Detta projekt handlar om fördelning av överspännings på transformatorgenomföringen under påverkan av elektromagnetisk transient respons, såsom blixtimpuls. För att förstå beteendet hos övergående respons på genomföringen är en korrekt modell av transformatorgenomföring inbyggd Comsol-flerfysik för att autentisera spänningsfördelningen. Den elektromagnetiska impulsvågen fortplantas från luftledningen som ansluter till transformatorn. Viss förståelse för det övergående beteendet hos en ledargenomföring har uppnåtts genom att studera påverkan av induktansegenskaper och hudeffektegenskaperna hos en flerskikts koaxialkabel på vågutbredningen, vilket har strukturerats i detta projekt för att förenkla modellen. Å andra sidan har hudeffektanalysen på genomföringens ledare beaktats i detta projekt med användning av verklig ledarsimulering i Comsol-modellen. Således blir det intressant att jämföra den riktiga ledarmodellen med den perfekta ledaren för genomföringen genom att analysera strömtäthetseffekten på den. I detta projekt simuleras flerskikt av koaxialkabel och transformatorgenomföring. Simuleringen utförs för tidsdomän och frekvensdomän i Comsol baserat på modellegenskaperna.
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