Microstrip Antennas
Mostrando 13-24 de 51 artigos, teses e dissertações.
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13. A 50Ω Microstrip Line Fed Shorted Hexagonal Microstrip Antennas with Reduced Cross-Polarization
Abstract A Hexagonal Microstrip Antenna (HMSA) is an approximation to a Circular MSA (CMSA), which is not symmetrical over two principal planes, unlike a CMSA. Consequently, two types of feed positions are feasible for each X and Y-axes. When a quarter-wave transformer or inset feed is used to match the edge impedance of the HMSA, it becomes asymmetrical ove
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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14. Performance Analysis of Probe-Fed Circularly-Polarized Moderately-Thick Microstrip Antennas Designed under the Null Reactance Condition
Abstract This work presents a performance analysis of probe-fed circularly-polarized moderately-thick microstrip patch antennas. Five typical geometries are designed according to the null reactance condition. A nonlinear regression, based on HFSS simulations, is implemented in order to identify the most robust geometry, regarding the manufacturing process. T
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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15. A Compact UWB Monopole Antenna with Rejected WLAN Band using Split-Ring Resonator and Assessed by Analytic Hierarchy Process Method
Abstract The design of a compact microstrip line-fed Ultra-wideband (UWB) monopole antenna with a notched band characteristic is presented in this paper. The rejection frequency band occurs around 5-6 GHz, which is appropriate for wireless local area network (WLAN) applications and is obtained by a split-ring resonator on the antenna ground plane. The propos
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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16. Parametric Study of Printed Monopole Antenna Bioinspired on the Inga Marginata Leaves for UWB Applications
Abstract A microstrip leaf-shaped printed monopole antenna bioinspired on the Inga marginata leaves is presented in this paper for UWB applications. A parametric study of the proposed antenna bioinspired geometry was conducted in order to verify their resonant properties. The antenna was designed with a rectangular slitted ground plane for impedance matching
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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17. A low-profile and ultra-wideband printed antenna with a 176% bandwidth
Abstract This work reports the development of a simple, low-profile and ultra-wideband printed antenna. The proposed antenna is based on a truncated ground plane and an impedance matching structure formed by a round junction and two chamfers; these modifications significantly increase the antenna frequency bandwidth compared to conventional microstrip antenn
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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18. Probe-Fed linearly-polarized electrically-equivalent microstrip antennas on FR4 substrates
This paper describes a simple but efficient procedure for designing electrically-equivalent microstrip antennas on FR4 sub-strates. Radiation patterns, reflection coefficient magnitude ( |Γ| ), mutual coupling and cross-polarization level of probe-fed linearly-polarized antennas are calculated and discussed. Experimental results of |Γ| and radiation patter
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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19. Microstrip feed spanner shape monopole antennas for ultra wide band applications
An optimized design for the spanner shape regular hexagonal monopole (RHM) patch antennas has been reported to yield ultra wide band (UWB) impedance bandwidth. Impedance and radiation characteristics are presented and discussed. From the results, it has been observed that, the impedance bandwidth, defined by 10 dB return loss, can reach a value of 8.63GHz. A
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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20. ObtenÃÃo das cerÃmicas dielÃtricas BiTRWO6 (TR = Y, Gd ou Nd) por radiaÃÃo de micro-ondas e sua aplicaÃÃo em dispositivos eletrÃnicos / Obtaining Of Ceramic Dielectric BiTRWO6 (Tr = Y, Gd Or Nd) By Microwave Radiation And Its Application In Electronic Devices
The mixture heat of the metal oxides may promote the formation of ceramic materials, depending on their dielectric properties and its crystalline structure may be used with electronic components for a variety of functions in electrical circuits. Heating method is directly related to the material properties. This work aims to use a commercial microwave oven m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/08/2012
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21. O detector de ondas gravitacionais Mario Schenberg: uma antena eférica criogênica com transdutores paramétricos de cavidade fechada. / The Mario Schenberg gravitational wave detector: a spherical cryogenic antenna with parametric transducers of closed cavity
A existência de ondas gravitacionais foi confirmada indiretamente pela observação astronômica de pulsares binários. Detectores de ondas gravitacionais tem sido desenvolvidos desde o trabalho pioneiro de Weber nos anos 60. Esforços estão sendo realizados no sentido de aumentar a sensibilidade dos detectores e realizar uma detecção direta, que ainda n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/03/2012
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22. Estudo do efeito de substratos metamateriais em parâmetros de antenas de microfita
As antenas de microfita são objeto de estudo em diversos campos de pesquisa devido a suas inúmeras vantagens. A obtenção, em 1999, de uma nova classe de materiais, chamados metamateriais - normalmente compostos por elementos metálicos imersos em um meio dielétrico, tem atraído a atenção da comunidade científica, graças às suas propriedades eletro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/02/2012
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23. Analysis of microstrip antennas on carbon fiber composite material
In this paper a truncated corner rectangular microstrip antenna (TCRMA) is analyzed in the presence of carbon fiber composite (CFC) material. Simplified carbon fiber composite models are proposed and the analyses are performed by the electromagnetic simulator Computer Simulation Technologies (CST). Theoretical and experimental results of return loss, axial r
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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24. Estudo de antenas patches de microfita miniaturizadas em banda larga para aplicação em dispositivos móveis e portáteis
Esse trabalho apresenta técnicas usadas para projetar e fabricar antenas patch de microfita para aplicações em dispositivos portáteis e móveis. Para isso, são avaliados diversos fatores que podem influenciar no desempenho das antenas patch de microfita. Técnicas de miniaturização são estudadas e empregadas visando a aplicação deste tipo de antena
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011