Omnidirectional Antennas
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Compact Triple Band Notched Pentagonal Shaped UWB Antenna Loaded with Slots and Parasitic Resonator
Abstract In this paper, a compact, planar printed microstrip line fed pentagonal shape ultra-wideband antenna with triple band-notched characteristics is proposed and investigated. By incorporating a pair of mirrored Γ-shape, a pair of mirrored L-shape slots in the pentagonal patch and bent C-shape parasitic strip at the backside of a patch, the tunable ban
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Omni-Directional Wideband Antenna Array with Solar Cells
Abstract Distributed sensor networks are becoming more and more widespread due to their substantial benefits to our daily lives. These sensors, in most cases, are distributed in nature and even may require mobility. This, in turn, implies omnidirectional collector units to collect the data from various sensors at arbitrary directions. This work summarizes th
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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3. Channel Characteristics for Fixed and Portable DTV Reception in a Single Frequency Network
Abstract This paper presents the propagation channel characteristics of a digital TV single-frequency network (SFN) obtained by carrying out field measurements using two synchronized transmitters. The measurements are performed at 31 reception points using both a directive reception antenna, which is typical of fixed reception scenarios, and an omnidirection
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 12/09/2019
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4. SYNTHESIS AND RIGOROUS ANALYSIS OF OMNIDIRECTIONAL DUAL-REFLECTOR ANTENNAS: THE CASE OF THE MAIN REFLECTOR WITH CIRCULAR GENERATRIX / SÍNTESE E ANÁLISE RIGOROSA DE ANTENAS OMNIDIRECIONAIS DE DUPLO-REFLETORES: O CASO DO REFLETOR PRINCIPAL COM GERATRIZ CIRCULAR
Este trabalho aborda o projeto de antenas omnidirecionais de duplorefletores, onde o refletor principal é obtido a partir de uma geratriz circular. A antena é composta de refletores circularmente simétricos e concêntricos que são alimentados por uma corneta cônica coaxial excitada pelo modo TEM para a produção de polarização vertical. Para realizar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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5. SYNTHESIS AND ANALYSIS OF CIRCULARLY SYMMETRIC REFLECTORS VIA PHYSICAL OPTICS AND FRINGE WAVE CURRENTS / ANÁLISE E SÍNTESE DE REFLETORES CIRCULARMENTE SIMÉTRICOS PELOS MÉTODOS DA ÓTICA FÍSICA E CORRENTES DE FRANJA
The usual algorithms employed in the design of shaped reflector antennas for satellite applications embed an electromagnetic analysis method in an optimization technique. In general, these algorithms demand considerable computation time, limiting its intensive use in the study to explore different sets of specifications and to search for more compact geometr
Publicado em: 2009
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6. Análise de antenas refletoras circularmente simétricas com a presença de corpos dielétricos
This work develops theoretical, analytical and numerical tools for solution of electromagnetic scattering from bodies of revolution, composed by perfect conductors and dielectrics, such as reflector antennas with radomes. Accurate analyses of these structures are performed through algorithms based on electric and magnetic integral equations, numerically eval
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/05/2007
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7. APLICAÇÃO DO MÉTODO DOS ELEMENTOS FINITOS NA ANÁLISE E PROJETOS DE ESTRUTURAS COAXIAIS / APPLICATION OF FINITE ELEMENTS METHOD IN THE ANALYSIS AND DESIGN OF COAXIAL STRUCTURES
In this work, the Method of Finite Element is applied in the electromagnetic analysis and project of coaxial horns employed as feed in omnidirectional reflector antennas. These feeds are usually excited by standard commercial connectors that require an adaptor to connect to the coaxial horn. This adaptor is usually composed of non-uniform sections of coaxial
Publicado em: 2006
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8. APLICAÇÃO DE MÉTODO DOS MOMENTOS NA ANÁLISE DE ANTENAS CÔNICAS / APPLICATION METHOD OF MOMENTS FOR THE ANALYSIS OF CONICAL ANTENNAS
Neste estudo faz-se uma análise do desempenho de antenas cônicas compactas para operar em largas bandas de freqüência. Esta análise será feita observando o comportamento da impedância da antena. Serão, primeiramente, consideradas as estruturas convencionais formadas por cones e cones sobrepostos próximos a um plano condutor. Posteriormente, será co
Publicado em: 1999