Ebg
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. Grating Lobes Suppression in Frequency Selective Surfaces Using Electromagnetic Band Gap with Square Holes
Abstract In this paper, the authors present a proposal for an application of electromagnetic bandgap (EBG), for suppression of grating lobes, in frequency selective surfaces (FSS), not yet studied in the literature. An alternative type of EBG with square holes was proposed to reduce the computational effort in simulations. The study consists of an applicatio
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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2. Mutual Coupling Reduction in Phased Array Antennas Applying High-Impedance Surface at X Band
Abstract This paper presents a microstrip phased array using High Impedance Surface - Electromagnetic Bandgap (HIS-EBG) in order to minimize the effects of mutual coupling among the antenna elements. Each element of the array is fed by a coaxial cable allowing the beam steering by controlling the signal of the input port of each element. This phased array op
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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3. Improvement of Circularly Polarized Slot-Patch Antenna Parameters by Using Electromagnetic Band Gap Structures
Abstract This paper is devoted to the design of a novel Electromagnetic Band Gap (EBG) circularly polarized slot-patch antenna in multilayered configuration. The operating frequency band can be controlled via the disk radius and adjusting the slit lengths. An arrangement combining the circular slot-patch antenna design and feeding sources included are consid
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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4. Design of high gain and wide band EBG resonator antenna with dual layers of same dielectric superstrate at X-bands
Abstract A wide band EBG resonator antenna with two layer of dielectric superstrates of the same material is design which is operating in X band. The EBG superstrates act as Partially Reflective Surfaces (PRS) having positive reflection phase curve which are suspended above a double sided dipole patch antenna fed by a coaxial cable pass through ground plane.
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-06
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5. Study of different shape Electromagnetic Band Gap (EBG) structures for single and dual band applications
In this paper, single and dual band EBG structures for wider bandwidth are proposed. In each of the discussed EBGs, a metallic patch of regular geometry is chosen for the unit element. The patch is further modified by cutting slots to get extra inductance and capacitance which results into lower cut-off frequency and larger bandwidth. The proposed EBG struct
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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6. Energy and protein nutritional requirements for Nellore bulls
The objective of this study was to determine the nutritional requirements of energy and protein and estimate the efficiencies of metabolizable energy utilization for fat and protein deposition, as well as for maintenance (k m) and growth (k g). An experiment of comparative slaughter was carried out with thirty-seven 14-month-old (±1 month) Nellore bulls wit
Revista Brasileira de Zootecnia. Publicado em: 2012-06
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7. Fotossensibilizadores nanoestruturados por sistema camada por camada
A busca por materiais que possam ser modificados em nível molecular tem sido o alvo de numerosas pesquisas no mundo. Desta maneira, as técnicas de fabricação de filmes finos se destacam devido à possibilidade de se reduzir custos e melhorar a eficiência de sistemas como, por exemplo, os fotossensíveis. Neste contexto, o objetivo deste trabalho foi a o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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8. Aplicações de Dispositivos de Microondas utilizando Substrato EBG/PBG para Comunicações Móveis
A sociedade moderna depende de um eficiente sistema de comunicações, capaz de transmitir e receber informações com uma velocidade e confiabilidade maiores a cada momento. A necessidade de dispositivos cada vez mais eficientes faz surgir técnicas de otimização dos dispositivos em microfita, como por exemplo, técnicas para aumentar a largura de banda:
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2011
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9. Análise teórica e experimental de superfícies seletivas de freqüência e suas aplicações em antenas planares
This work presents a theoretical and numerical analysis of structures using frequency selective surfaces applied on patch antennas. The FDTD method is used to determine the time domain reflected fields. Applications of frequency selective surfaces and patch antennas cover a wide area of telecommunications, especially mobile communications, filters and WB ant
Publicado em: 2009
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10. Desempenho e exigências de energia, proteína e minerais de bovinos de corte em pastejo, submetidos a diferentes estratégias de suplementação / Performance and energy, protein and minerals requirements of beef cattle at pasture, submitted to different supplementation strategies
This thesis was elaborated based upon four experiments that amaid to evaluate the effects of different supplementation strategies on performance and nutritional characteristics of beef cattle during dry, rainy and rainy/dry seasons at pastures of Brachiaria decumbens; as well as estimate the body composition and the energy, protein, calcium (Ca), phosphorus
Publicado em: 2006
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11. Tecnologia de estruturas EBG - electromagnetic ban-gap : aplicada a antenas para comunicações moveis
This work describes the application of EBG, Electromagnetic Band-Gap, structures on antennas for mobile communication systems. This technology can be used in both 3G and 4G mobile communication systems; for base stations, pico ba..c;;e stations, and mobile terminaIs; on WLAN, Wi-Fi, Bleutooth, WiMAX (IEEE802.16a), and other technologies. EBG structures are d
Publicado em: 2004
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12. Tecnologia de estruturas EBG - electromagnetic band-gap - aplicada a antenas para comunicações moveis
ormado.
Publicado em: 2004