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‣ Análise de antenas no domínio do tempo.; Time-domain analysus of antennas.

Freitas, Renata Valerio de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 24/02/2012 Português
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As recentes aplicações que utilizam bandas ultralargas e comunicação pulsada necessitam de antenas adaptadas às suas necessidades. Para tanto, é necessário entender melhor o funcionamento dessas antenas em toda a banda utilizada e sua resposta aos pulsos de entrada. Nesse sentido, algumas ferramentas de análise de antenas no domínio do tempo foram desenvolvidas e utilizadas de modo a explicar o mecanismo de radiação de algumas antenas. Através da utilização de estruturas grandes com relação à duração do pulso de entrada, é possível identificar como o pulso se propaga e é refletido pela estrutura. Em seguida, é estabelecida a relação entre a localização do pulso e a radiação gerada pela geometria da antena nessa posição. Com isso se pode identificar as origem das características da resposta impulsiva da antena e a sua relação com a aceleração de cargas que ocorre na estrutura. Finalmente, são apresentados alguns resultados relacionados ao desempenho da antena como dispersão, distorção e diagrama de radiação de energia normalizado.; The recent applications that uses UWB and pulse communications demands antennas that fits better its constraints. Therefore, it is necessary to understand the behaviour of these antennas in all the bandwidth used and its response to input pulses. With this objective...

‣ Antenas planares de micro-ondas multibandas para terminais móveis de sistemas de comunicação sem fio.; Multi-band microwave planar antennas for mobile terminals of wireless communication systems.

Seko, Murilo Hiroaki
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 05/02/2013 Português
Relevância na Pesquisa
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Neste trabalho, foram desenvolvidas antenas planares de micro-ondas multibandas para aplicação em terminais móveis de sistemas de comunicação sem fio. Foi realizado um estudo sobre antenas planares de micro-ondas, com ênfase em técnicas de projeto que possibilitam a operação das mesmas em bandas largas e em múltiplas bandas. A partir dos conhecimentos adquiridos com esse estudo, foram propostas configurações de antenas para terminais móveis de sistemas atuais de telefonia móvel, de WLAN e de WPAN, sistemas esses que têm experimentado nos últimos anos uma grande popularização mundial. Por meio de um procedimento de projeto auxiliado por simulação eletromagnética computacional, as configurações propostas de antenas foram analisadas e otimizadas, visando atender às especificações de projeto estabelecidas para operação nos sistemas mencionados. O desempenho que pode ser obtido com essas configurações de antenas depende de diversos parâmetros geométricos das mesmas, resultando em flexibilidade de projeto para obtenção das bandas de operação desejadas. Protótipos das antenas projetadas foram construídos e caracterizados para validar as configurações propostas de antenas e o procedimento de projeto empregado. Foram desenvolvidas quatro antenas para operação em sistemas de telefonia móvel...

‣ Antenas impressas compactas para sistemas WIMAX.; Small patch antennas for WIMAX systems.

Moraes, Leonardo Bastos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/09/2012 Português
Relevância na Pesquisa
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Alcançar altas taxas de dados em comunicações sem fio é difícil. Altas taxas de dados para redes locais sem fio tornou-se comercialmente um sucesso por volta do ano de 2000. Redes de longa distância sem fio ainda são projetados e utilizados principalmente para serviços de voz em baixas taxas. Apesar de muitas tecnologias promissoras, a realidade de uma rede de área ampla que atenda muitos usuários com altas taxas de dados e largura de banda e consumo de energia razoáveis, além de uma boa cobertura e qualidade no serviço ainda é um desafio. O objetivo do IEEE 802.16 é projetar um sistema de comunicação sem fio para obter uma internet de banda larga para usuários móveis em uma área metropolitana. É importante perceber que o sistema WIMAX tem que enfrentar desafios semelhantes aos existentes sistemas celulares e seu desempenho eventual será delimitado pelas mesmas leis da física e da teoria da informação. Em muitas áreas da engenharia elétrica, tem-se direcionado atenção à miniaturização de componentes e equipamentos. Em particular, antenas não são exceções. Desde que Wheeler iniciou estudos sobre os limites fundamentais de miniaturização de antenas, o assunto tem sido discutido por muitos estudiosos e várias contribuições nesse sentido foram feitas desde então. Os avanços das últimas décadas na área de microeletrônica permitiram a miniaturização dos demais componentes empregados no desenvolvimento de equipamentos eletrônicos e disponibilizaram o uso de aparelhos compactos...

‣ Determination of resonant frequencies of triangular and rectangular microstrip antennas, using artificial neural networks

Brinhole, E. R.; Destro, J. F. Z.; Freitas, A. A. C. de; Alcantara, N. P. de
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 579-582
Português
Relevância na Pesquisa
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This paper presents models that can be used in the design of microstrip antennas for mobile communications. The antennas can be triangular or rectangular. The presented models are compared with deterministic and empirical models based on artificial neural networks (ANN) presented in the literature. The models are based on Perceptron Multilayer (PML) and Radial Basis Function (RBF) ANN. RBF based models presented the best results. Also, the models can be embedded in CAD systems, in order to design microstrip antennas for mobile communications.

‣ Weight vector estimation of circular arrays of antennas using Artificial Neural Networks

De Alcantara, N. P.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 93-98
Português
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This paper presents a model for the control of the radiation pattern of a circular array of antennas, shaping it to address the radiation beam in the direction of the user, in order to reduce the transmitted power and to attenuate interference. The control of the array is based on Artificial Neural Networks (ANN) of the type RBF (Radial Basis Functions), trained from samples generated by the Wiener equation. The obtained results suggest that the objective was reached.

‣ New contributions to the determination of resonance frequencies of rectangular microstrip antennas by neural networks

De Alcantara, N. P.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 99-104
Português
Relevância na Pesquisa
37.127%
This paper uses artificial neural networks (ANN) to compute the resonance frequencies of rectangular microstrip antennas (MSA), used in mobile communications. Perceptron Multi-layers (PML) networks were used, with the Quasi-Newton method proposed by Broyden, Fletcher, Goldfarb and Shanno (BFGS). Due to the nature of the problem, two hundred and fifty networks were trained, and the resonance frequency for each test antenna was calculated by statistical methods. The estimate resonance frequencies for six test antennas were compared with others results obtained by deterministic and ANN based empirical models from the literature, and presented a better agreement with the experimental values.

‣ Size reduction and tuning of integrated folded patch antennas using slots

Mendes, P. M.; Bartek, M.; Burghartz, J. N.; Correia, J. H.
Fonte: Horizon House Publicador: Horizon House
Tipo: Conferência ou Objeto de Conferência
Publicado em /10/2004 Português
Relevância na Pesquisa
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We report on the use of slots for size reduction and tuning of folded patch antennas operating in the 5-6 GHz ISM band, with intended application in short-range wireless communications. Varying the slot length modifies the antenna electrical length, thus providing a new degree of freedom to control the antenna operating properties, and is the main novelty of our work. This technique was used for antenna tuning, input impedance control, and, very important, for antenna size reduction. Keeping the operating frequency at 5.7 GHz, application of slots allows an antenna size reduction close to 30%. Keeping the antenna dimensions constant, application of slots allows its tuning from 5.7 GHz down to 4.8 GHz and is potentially suitable for dynamic antenna reconfiguration.; Fundação para a Ciência e Tecnologia (FCT) (SFRH/BD/4717/ 2001, POCTI/ESE/38468/2001, FEDER).

‣ Review of 20 years of research on microwave and millimeter-wave lenses at “Instituto de Telecomunicações”

Fernandes, C. A.; Costa, J. R.; Lima, E. B.; Silveirinha, M. G.
Fonte: IEEE Antennas and Propagation Society Publicador: IEEE Antennas and Propagation Society
Tipo: Artigo de Revista Científica
Publicado em //2015 Português
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WOS:000352237400023 (Nº de Acesso Web of Science); Starting from a challenge in the early 1990s to develop a highly shaped beam dielectric lens antenna for a pilot 150 Mb/s cellular mobile broadband system operating in the 60-GHz band, several new developments have been accomplished over more than 20 years at Instituto de Telecomunicações [1] in the areas of millimeter-wave shaped dielectric lens antennas and planar metamaterial lenses. We review here a few representative examples with numerical and experimental results, covering applications in mobile broadband communications, radiometry, satellite communications, multigigabit short-range communications, and sublambda near-field target detection.

‣ Dynamic analysis of superconductor at high temperature for antennas array

Fernandes,H. C. C.; Caetano,L. M.; Maia,H. M. C. A.
Fonte: Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo Publicador: Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2013 Português
Relevância na Pesquisa
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The analysis and new results of the resonance frequency and radiation pattern of antennas array, for glass fiber FR-4 substrate using superconductor and copper patch, are presented. The linear superconducting rectangular antennas array uses the new materials SnBaCaCuOy at temperature of 160 K with conductivity equal 1.5 x 10(5) S/m. The concise full wave Transverse Transmission Line (TTL) method is used in the analysis and to obtain some results. The HFSS is also used and new results for the reflection coefficient (S11), return loss as functions of the resonant frequency, and pattern radiation of antennas array, are presented.

‣ Antennas for the detection of radio emission pulses from cosmic-ray induced air showers at the Pierre Auger Observatory

Barber, K.; Bellido Caceres, J.; Clay, R.; Cooper, M.; Dawson, B.; Harrison, T.; Herve, A.; Holmes, V.; Sorokin, J.; Wahrlich, P.; Whelan, B.
Fonte: Institute of Physics Publishing Ltd Publicador: Institute of Physics Publishing Ltd
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
Relevância na Pesquisa
36.97262%
The Pierre Auger Observatory is exploring the potential of the radio detection technique to study extensive air showers induced by ultra-high energy cosmic rays. The Auger Engineering Radio Array (AERA) addresses both technological and scientific aspects of the radio technique. A first phase of AERA has been operating since September 2010 with detector stations observing radio signals at frequencies between 30 and 80 MHz. In this paper we present comparative studies to identify and optimize the antenna design for the final configuration of AERA consisting of 160 individual radio detector stations. The transient nature of the air shower signal requires a detailed description of the antenna sensor. As the ultra-wideband reception of pulses is not widely discussed in antenna literature, we review the relevant antenna characteristics and enhance theoretical considerations towards the impulse response of antennas including polarization effects and multiple signal reflections. On the basis of the vector effective length we study the transient response characteristics of three candidate antennas in the time domain. Observing the variation of the continuous galactic background intensity we rank the antennas with respect to the noise level added to the galactic signal.; The Pierre Auger Collaboration...

‣ Wire antennas optimizations on various platforms using radial basis functions and evolutionary algorithms.

Zhao, Shifu
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2013 Português
Relevância na Pesquisa
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High Frequency (HF) and Very High Frequency (VHF) electromagnetic waves have been used as the means of long-distance communication for decades. Nevertheless, in the design of wire antennas for HF and VHF devices, size reduction is one of the critical issues due to wavelengths of in ranges from 1 to 100 meters. It is well known that inductive and capacitive loadings can effectively change the current distribution along an antenna, reducing the self-resonant frequency, and hence the antenna size. Various types of inductive and capacitive loadings can be implemented on the wire antennas using ideal lumped components or realistic winding structures, such as zig-zag and helix shapes. Nevertheless, the physical limits of electrically small antenna can greatly constrain the dimensions, and the design of optimally varying windings will significantly increase the complexity in the modeling and simulation process. Furthermore, size reduction can also introduce significant degradation in both efficiency and bandwidth, and thus, obtaining a design with balanced performance becomes a challenging task, which is addressed in this thesis. The work presented in this thesis contributes to the research by proposing and applying a generic methodology to the optimal design of size-reduced HF and VHF wire antennas. The electromagnetic simulator...

‣ MATNEC: an in-house developed tool for electromagnetic simulation and evolutionary optimization of wire antennas

Zhao, S.; Fumeaux, C.; Fickenscher, T.
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Conference paper
Publicado em //2014 Português
Relevância na Pesquisa
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Various techniques of numerical electromagnetic computation have been widely used for decades in the design of antennas. In particular, the Numerical Electromagnetic Code was developed based on the method of moments to solve integral equations for current distributions, and thus, it is particularly efficient for the modeling and analysis of wire antennas and other metal structures. The computation load can, however, increase significantly with the increase of complexity in structure modeling. Radial basis functions are employed for geometry description to ease such burden by representing structural variations with a minimal number of variables. Evolutionary optimizations are used to explore a wider solution space in a timely manner in the pursuit of near-optimal solution in a multivariable environment. An in-house tool called MATNEC integrating modeling, simulation, analysis, and optimization is developed, which can successfully deliver near-optimal solutions under a pre-defined fitness function, considering both antenna efficiency and bandwidth. Helical antennas with variations in radius and pitch are successfully optimized, which effectively verifies the robustness of MATNEC and methodology applied; S. Zhao, C. Fumeaux, and T. Fickenscher

‣ Multifrequency and multifunction antennas based on single printed technology partially filled with metamaterial structures

Segovia Vargas, Daniel
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: Relatório Formato: application/pdf
Publicado em 15/04/2008 Português
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The Radiofrequency Group from the Escuela Politécnica Superior of the Carlos III University from Madrid have been working in printed antennas for a long time. Recently the new technology of metamaterials has opened new possibilities in the development of multifrequency antennas with different radiation patterns to be used simultaneously for several applications (i.e. different mobile services and GPS or Galileo)

‣ Evaluating the effective diversity gain on laptop antennas

Cañizares Lozano, Laura
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: info:eu-repo/semantics/bachelorThesis; info:eu-repo/semantics/masterThesis Formato: application/pdf
Português
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In the past few years the demand of high data transmission rates for video, image and other communications has increased. Therefore, a lot of research has been done to improve the link budget between mobile and base station. Multiple Input and Multiple Output (MIMO) systems have been introduced in the recent years using the decorrelation of signals coming from the overall multipath environment. In such systems, the capacity in communication links depends on signal to noise ratio and also on signal correlation when many antennas receive the transmitted signal. The correlation also plays a large role in diversity schemes but the radiation efficiency is often the main limiting factor of the effective diversity gain. The aim of the thesis is to study the influence of the radiation efficiency and correlation on the effective diversity gain between the antenna elements by varying the source impedance. The source impedance is altered within practical limits and the effective diversity gain is calculated for these source impedances. Support simulations have been performed using CST Microwave Studio and analyzed using a software called Multi-Port Antenna evaluator (MPA) developed in CHASE. Several examples are successively treated, starting from two parallel dipoles to prove the correct performance of the MPA software. Thereafter five and three antenna configurations are considered on a laptop. For our proposed laptop example...

‣ Ultra-wideband phased array antennas for low frequency radio astronomy

Lera Acedo, Eloy de
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: info:eu-repo/semantics/doctoralThesis; info:eu-repo/semantics/doctoralThesis Formato: application/pdf; application/pdf
Português
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Esta tesis se centra en el desarrollo de antenas diferenciales de banda ultra ancha para arrays de apertura, como los que han sido propuestos por el consorcio internacional para cubrir las bandas bajas de frecuencia del telescopio (SKA-AAlo (0.07-0.45 GHz) y SKA-AAhi (0.3-1 GHz)). La tesis comienza con una introducción al campo de la radioastronomía y una presentación del estado del arte de la teoría y las tecnologías de arrays de antenas de banda ultra ancha para radioastronomía. Los capítulos principales del documento se centran en explicar el proceso de diseño y medida de 3 prototipos (2 para SKA-AAhi y 1 para SKA-AAlo), que representan propuestas española, holandesa y británica respectivamente para cubrir las citadas frecuencias. Se hace especial hincapié en las di cultades en el diseño de antenas diferenciales de banda ultra ancha y que además han de ser de bajo coste, ya que el telescopio contara con miles y hasta millones de elementos. Estas di cultades incluyen, entre otras, el análisis de los materiales, la medida de los prototipos, la eliminación de anomalías de banda estrecha o el ruido del sistema. Finalmente se presenta una técnica para la simulación electromagnética de arrays de antenas irregulares de gran tamaño...

‣ Design and development of microwave patch antennas using conductive polymers.

Verma, Akhilesh
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2012 Português
Relevância na Pesquisa
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Recent advances in the electrical conductivity levels of Conducting Polymers (CP) and impressive improvements in their stability are making these materials very attractive potential alternatives to copper in planar antennas. This is particularly so in applications where light weight, inexpensive and/or wearable/conformal antennas are a consideration. There have been isolated efforts in the past towards using CP as material for antenna and transmission line design. This thesis endeavours to provide a systematic study of key factors that are important for the understanding of these materials, their design and simulation as basis material for building microwave antennas. The thesis could be considered as made up of two parts. The first part (Chapter 2 and Appendix A) presents a mathematical model of electrical conduction and permittivity in CPs as a function of dopant concentration and frequency. The electrical conduction and permittivity are very dispersive for these materials primarily due to different relaxation times exhibited by the conduction electrons. This part also develops closed-form expressions formulas for rapid estimation of the effective permittivity of microstrip lines on multi-layer substrates. A 2D finite element eigen-mode analysis leading to the effective permittivity for two and three layer microstrip line structures is used as a reference solution and successfully validates the closed-form expressions. The second part (Chapter 3 and 4) presents the design...

‣ Metamaterial-loaded printed antennas : design and application

Herraiz Martínez, Francisco Javier
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: info:eu-repo/semantics/doctoralThesis; info:eu-repo/semantics/doctoralThesis Formato: application/octet-stream; application/octet-stream; application/pdf; application/pdf
Português
Relevância na Pesquisa
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Wireless communication systems have grown dramatically during the last few years. Moreover, these systems have achieved a great popularity in society. Several examples can be mentioned: cellular communications (GSM, DCS, UMTS), personal area networks (Bluetooth), local area wireless networks (WiFi), radionavigation systems (GPS), etc. The current trend consists of using only one user terminal for several standards (e. g. GSM and UMTS terminals) and for more than one service (e. g. cellular communications, radionavigation systems and personal area networks). In addition, it is also important to note that current user terminals are more and more compact. For these reasons, it would be desirable to use only one antenna for all the standards and/or services covered by the terminal. However, it is important to note that each standard or service requires different antenna characteristics in terms of operating frequency and optimal radiation performance (radiation pattern, polarization, etc.). Hence, compact antennas with multifrequency (simultaneous operation over two or more bands) and multifunction performance (radiation pattern or polarization diversity, frequency reconfigurability, etc.) are a good solution as the radiating element of hanheld terminals. Furthermore...

‣ Periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide

Lai, Q.; Fumeaux, C.; Hong, W.
Fonte: The Institution of Engineering and Technology Publicador: The Institution of Engineering and Technology
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
Relevância na Pesquisa
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This study presents two configurations of periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide (HMSIW) where a metallised trough is employed as the waveguide's side wall. The first antenna configuration is constructed from periodically etching a row of transverse slots on the ground plane of the feeding HMSIW, whereas in the second configuration, the row of slots is cut into the HMSIW top wall. Influence of the slot length and period on the propagation constant of the fundamental space harmonic is quantitatively characterised through analytical equations, simulations and measurements of fabricated prototypes. This provides essential information towards the synthesis of more sophisticated HMSIW-fed leaky-wave antennas. The performance of the two prototypes demonstrates forward-to-backward radiation within the mono-mode regime of the feeding HMSIW. The agreement between the theoretical, numerical and experimental results validates both the overall analysis procedure and the concept of periodically slotted thru HMSIW as leaky-wave antennas.; Lai, Q. Fumeaux, C. Hong, W.

‣ Antennas for the detection of radio emission pulses from cosmic-ray induced air showers at the Pierre Auger Observatory

Abreu, P.; Aglietta, M.; Ahlers, M.; Ahn, E. J.; Albuquerque, Ivone Freire da Mota e; Allard, D.; Allekotte, I.; Allen, J.; Allison, P.; Almela, A.; Alvarez Castillo, J.; Alvarez-Muniz, J.; Alves Batista, R.; Ambrosio, M.; Aminaei, A.; Anchordoqui, L.; An
Fonte: IOP PUBLISHING LTD; BRISTOL Publicador: IOP PUBLISHING LTD; BRISTOL
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.97262%
The Pierre Auger Observatory is exploring the potential of the radio detection technique to study extensive air showers induced by ultra-high energy cosmic rays. The Auger Engineering Radio Array (AERA) addresses both technological and scientific aspects of the radio technique. A first phase of AERA has been operating since September 2010 with detector stations observing radio signals at frequencies between 30 and 80 MHz. In this paper we present comparative studies to identify and optimize the antenna design for the final configuration of AERA consisting of 160 individual radio detector stations. The transient nature of the air shower signal requires a detailed description of the antenna sensor. As the ultra-wideband reception of pulses is not widely discussed in antenna literature, we review the relevant antenna characteristics and enhance theoretical considerations towards the impulse response of antennas including polarization effects and multiple signal reflections. On the basis of the vector effective length we study the transient response characteristics of three candidate antennas in the time domain. Observing the variation of the continuous galactic background intensity we rank the antennas with respect to the noise level added to the galactic signal.

‣ Size reduction of microstrip antennas using left-handed materials realized by complementary split-ring resonators

Limaye, Aparna
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado Formato: 4494583 bytes; application/pdf
Português
Relevância na Pesquisa
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Recently, metamaterials (MTMs) engineered to have negative values of permittivity and permeability, resulting in a left-handed system, have provided a new frontier for microwave circuits and antennas with possibilities to overcome limitations of the right-handed system. Microwave circuit components such as waveguides, couplers, power dividers and filters, constructed on left-handed materials, have demonstrated properties of backward coupling, phase compensation, reduced sizes, and propagation of evanescent modes. However, there is very limited work to date, on the microstrip antennas with metamaterials. Microstrip antenna is widely used for its low-profile, simplicity of feed and compatibility with planar microstrip circuitry. As the trend towards miniaturization of electronic circuitry continues, antennas remain as the bulkiest part of wireless devices. There are three primary objectives to the present work: 1. Explore the possibility of miniaturizing microstrip patch antennas using left-handed materials through phase-compensation 2. Achieve negative permittivity using Complementary Split-Ring Resonators (CSRR) 3. Implement CSRR in the ground plane of a rectangular patch antenna, and validate through simulation and measurement A rectangular patch antenna with a combined DPS-DNG substrate has been analyzed with the cavity model...