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materials science, multidisciplinary (95) 95
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1. Full Text New ZnO@Cardanol porphyrin composite nanomaterials with enhanced photocatalytic capability under solar light irradiation
by Ribeiro, Viviane Gomes Pereira and Marcelo, Ana Maria Pereira and da Silva, Kássia Teixeira and da Silva, Fernando Luiz Firmino and Mota, João Paulo Ferreira and do Nascimento, João Paulo Costa and Sombra, Antonio Sérgio Bezerra and da Silva Clemente, Claudenilson and Mele, Giuseppe and Carbone, Luigi and Mazzetto, Selma Elaine
Materials, ISSN 1996-1944, 09/2017, Volume 10, Issue 10, p. 1114
This work describes the synthesis, characterization, and photocatalytic activity of new composite nanomaterials based on ZnO nanostructures impregnated by... 
ZnO | CNSL | Rhodamine B | Sunlight irradiation | Photocatalysis | Porphyrins | METHYLENE-BLUE | RHODAMINE-B | MATERIALS SCIENCE, MULTIDISCIPLINARY | sunlight irradiation | SURFACE MODIFICATION | 4-NITROPHENOL | rhodamine B | porphyrins | HIGHLY EFFICIENT | TIO2 COMPOSITES | VISIBLE-LIGHT | DEGRADATION | photocatalysis | METAL-IONS | Rhodamine | Infrared spectroscopy | Fourier transforms | Light irradiation | Photoluminescence | X-ray diffraction | Toxic wastes | Nanomaterials | Catalytic activity | Nanostructure | Electron microscopy | Spectrum analysis | Zinc oxide | Photocatalysts | Reflectance
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2. Full Text Graphene-based Mach–Zehnder nanophotonics interferometer working as a splitter/switch and as a multiplexer/demultiplexer
by Wirth Lima Jr, A and Sombra, A S. B
Optical and Quantum Electronics, ISSN 0306-8919, 11/2017, Volume 49, Issue 11, pp. 1 - 17
We developed and are presenting a graphene-based nanophotonic Mach–Zehnder Interferometer (MZI), which can operate as a signal follower, switch and splitter... 
Multiplexeer | Splitter | Switch | Graphene | Optics, Lasers, Photonics, Optical Devices | Characterization and Evaluation of Materials | Computer Communication Networks | MZI | Physics | Demultiplexer | Electrical Engineering | PLASMONICS | WAVE-GUIDES | OPTICS | ENGINEERING, ELECTRICAL & ELECTRONIC | Optical instruments | Graphite
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3. Full Text Dielectric Resonator Antennas with Frequency Stability Under Severe Temperature Variations Based on Li2MgTi3O8 Ceramic Matrix Added with Bi2O3
by Bezerra, J W. O and Oliveira, R G. M and Silva, M A. S and Maciel, T F and Goes, J C and Sombra, A S. B
Journal of Electronic Materials, ISSN 0361-5235, 12/2018, Volume 47, Issue 12, pp. 7272 - 7280
This paper presents the application of the Li2MgTi3O8 (LMT) ceramic matrix added with small quantities (0 wt.%, 1 wt.%, 3 wt.%, and 5 wt.%) of Bi2O3 for... 
Solid State Physics | ceramics | Materials Science | Microwave properties | Li 2 MgTi 3 O 8 | dielectric resonator antenna | Optical and Electronic Materials | Electronics and Microelectronics, Instrumentation | Characterization and Evaluation of Materials | temperature coefficient of resonant frequency | DESIGN | PHYSICS, APPLIED | Li2MgTi3O8 | MATERIALS SCIENCE, MULTIDISCIPLINARY | ENGINEERING, ELECTRICAL & ELECTRONIC
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4. Full Text Elucidation of microwave absorption mechanisms in Co–Ga substituted Ba–Sr hexaferrites in X-band
by Kaur, Harsimrat and Singh, Charanjeet and Marwaha, Anupma and Narang, Sukhleen Bindra and Jotania, Rajshree and Mishra, Sanjay R and Bai, Yang and Raju, K C. James and Singh, Dharmendra and Ghimire, Madhav and Dhruv, Preksha and Sombra, A S. B
Journal of Materials Science: Materials in Electronics, ISSN 0957-4522, 9/2018, Volume 29, Issue 17, pp. 14995 - 15005
The tunable microwave absorbers are used to combat the electromagnetic pollution created by the development of high speed electronic devices. In the present... 
Optical and Electronic Materials | Characterization and Evaluation of Materials | Materials Science | HEXAGONAL FERRITES | NANOPARTICLES | PHYSICS, CONDENSED MATTER | PHYSICS, APPLIED | BARIUM HEXAFERRITE | PROPERTY | MATERIALS SCIENCE, MULTIDISCIPLINARY | STRONTIUM HEXAFERRITE | COMPOSITES | MAGNETIC-PROPERTIES | ELECTROMAGNETIC PROPERTIES | ENGINEERING, ELECTRICAL & ELECTRONIC | Hematite | Composition | Barium | Electronic devices | Microwave absorbers | Absorbers | X-ray diffraction | Cobalt | Design optimization | Substitutes | Strontium | Microwave absorption | Impedance matching
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5. Full Text An alternative method for the measurement of the microwave temperature coefficient of resonant frequency (τ f)
by Silva, M.A.S and Fernandes, T.S.M and Sombra, A.S.B
Journal of Applied Physics, ISSN 0021-8979, 10/2012, Volume 112, Issue 7, p. 74106
In this paper an alternative method for the measurement of the temperature coefficient of resonant frequency (tau(f)), is presented. The traditional method... 
PERMITTIVITY | PHYSICS, APPLIED | CERAMICS | Thermal properties | Measurement | Usage | Frequency modulation | Dipole antennas | Aluminum compounds | Calcium compounds | Electric properties | Dielectric loss | Resonant frequencies | Bismuth | Niobates | Coefficients | Resonators | Antennas | Aluminum oxide
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6. Full Text Dielectrical and structural studies of composite matrix BiVO4–CaTiO3 and temperature effects by impedance spectroscopy
by Oliveira, R G. M and Freitas, D B and Batista, G S and de Morais, J E. V and Martins, V C and Costa, M M and Silva, M A. S and Gouvêa, D X and Singh, C and Sombra, A S. B
Journal of Materials Science: Materials in Electronics, ISSN 0957-4522, 10/2018, Volume 29, Issue 19, pp. 16248 - 16258
In this work, we have analysed the effects of adding CaTiO3 (CTO) and changing the temperature on the dielectric and electric properties of ceramic matrix... 
Optical and Electronic Materials | Characterization and Evaluation of Materials | Materials Science | BIVO4 | PHYSICS, CONDENSED MATTER | PHYSICS, APPLIED | MODULUS | MATERIALS SCIENCE, MULTIDISCIPLINARY | ELECTRICAL-CONDUCTIVITY | RELAXATION | PEROVSKITE | CERAMICS | ENGINEERING, ELECTRICAL & ELECTRONIC | Dielectric properties | X-ray diffraction | Bismuth oxides | Impedance spectroscopy | Ceramics | Ceramic molds | Calcium titanate | Radio frequency | Synthesis | Composite materials | Temperature effects | Spectrum analysis | Vanadates | Charge transfer | Crystal structure | Equivalent circuits
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7. Full Text RF and Microwave Electrical Properties Study of the Magneto-Dielectric Resonator Antenna of the Matrix Composite [SrFe12O19 (SFO)1−x -BiFeO3(BFO) x ]
by de Morais, J E. V and Oliveira, R G. M and Bessa, V L and Silva, M A. S and Costa, M M and Gouveia, D X and Goldsmith, J and Carroll, T K and Sombra, A S. B
Journal of Electronic Materials, ISSN 0361-5235, 10/2018, Volume 47, Issue 10, pp. 6144 - 6152
In this work, we prepared ceramic composites based on SrFe12O19 (SFO)-BiFeO3 (BFO) strontium hexaferrite. The SFO and BFO were synthesized by the solid-state... 
Solid State Physics | Materials Science | DRA | antennas | Hexaferrite | dielectric properties | Optical and Electronic Materials | Electronics and Microelectronics, Instrumentation | Characterization and Evaluation of Materials | thermal stability | PHYSICS, APPLIED | BARIUM HEXAFERRITE | MATERIALS SCIENCE, MULTIDISCIPLINARY | POWDER | CERAMICS | GLASSES | ENGINEERING, ELECTRICAL & ELECTRONIC | Electrical properties | Dielectric properties | Nyquist plots | X-ray diffraction | Radio antennas | Thermal stability | Radio frequency | Composite materials | Spectrum analysis | Bismuth compounds | Chemical synthesis | Resonators | Magnetic properties | Equivalent circuits | Structural analysis | Cylinders
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8. Full Text Performance of microstrip patch antenna due EBG/PBG arrangements insertion
by da Silva, José L and de Andrade, Humberto D and Maia, Anamaria S and Fernandes, Humberto C. C and da Silva, Isaac B. T and Sombra, Antônio S. B and Pereira, Jonathan P. P
Microwave and Optical Technology Letters, ISSN 0895-2477, 12/2016, Volume 58, Issue 12, pp. 2933 - 2937
ABSTRACT This paper aims to present microstrip patch antenna prototypes with rectangular patch, where structures of photonic band gap and electromagnetic band... 
microstrip patch antenna | photonic and electromagnetic band gap | WLAN | DESIGN | OPTICS | ENGINEERING, ELECTRICAL & ELECTRONIC | Antennas (Electronics) | Drilling | Wireless communication | Computer simulation | Patch antennas | Mathematical analysis | Banded structure | Insertion | Microwaves
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9. Full Text Comparisons of electrical and optical properties between graphene and silicene A review
by Wirth-Lima A J;Silva M G;Sombra A S B
中国物理B：英文版, ISSN 1674-1056, 2018, Volume 27, Issue 2, pp. 299 - 313
Two-dimensional （2D） metamaterials are considered to be of enormous relevance to the progress of all exact sciences. Since the discovery of graphene,... 
评论;性质;研究人员;原子结构;介电常数;活动性;传导性;充电 | silicone | electrical/optical properties | grapheme | PRESSURE | PLASMONICS | silicene | PHYSICS, MULTIDISCIPLINARY | graphene
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10. Full Text Structural and dielectric behaviour analysis of TiO2 addition on the ceramic matrix BiVO4
by Oliveira, R G. M and Batista, G S and de Morais, J E. V and Costa, M M and Silva, M A. S and Bezerra, J W. O and Sombra, A S. B
Journal of Materials Science: Materials in Electronics, ISSN 0957-4522, 9/2018, Volume 29, Issue 17, pp. 14557 - 14566
In this work, the dielectric and electric properties of the ceramic matrix BiVO4 (BVO) and the effects of the addition of TiO2 were analysed by impedance... 
Optical and Electronic Materials | Characterization and Evaluation of Materials | Materials Science | SUBSTITUTION | PHYSICS, CONDENSED MATTER | PHYSICS, APPLIED | MICROWAVE | MATERIALS SCIENCE, MULTIDISCIPLINARY | ELECTRICAL-PROPERTIES | RELAXATION | IMPEDANCE SPECTROSCOPY | ENGINEERING, ELECTRICAL & ELECTRONIC | SINGLE-CRYSTALS | CONDUCTION MECHANISM | LIGHT PHOTOCATALYTIC ACTIVITY | ABSORPTION | DOUBLE PEROVSKITE | Dielectric loss | Dielectric properties | Nyquist plots | X-ray diffraction | Bismuth oxides | Ceramics | Titanium oxides | Vanadates | Charge transfer | Permittivity | Titanium dioxide | Equivalent circuits | Electric properties
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11. Full Text All-optical logic gates based on XPM effect under the PAM-ASK modulation in a symmetric dual NLDC
by Ferreira, A C and Ferreira, A C and Sobrinho, C S and Sobrinho, C S and Guimarães, G F and Guimarães, G F and Sousa, J R. R and Sousa, J R. R and Menezes, J W. M and Menezes, J W. M and Lima Jr, A Wirth and Lima Jr, A Wirth and Lyra, M L and Lyra, M L and Sombra, A S. B and Sombra, A S. B
Microsystem Technologies, ISSN 0946-7076, 2/2019, Volume 25, Issue 2, pp. 447 - 459
We investigate the possibility of achieving all-optical logical gates based in a symmetric double non-linear directional coupler (NLDC) working with pulses of... 
Electronics and Microelectronics, Instrumentation | Engineering | Mechanical Engineering | Nanotechnology | PHYSICS, APPLIED | INSTABILITY | FILTER | PERFORMANCE | DISPERSION | MATERIALS SCIENCE, MULTIDISCIPLINARY | CROSS-PHASE MODULATION | NANOSCIENCE & NANOTECHNOLOGY | COUPLED-MODE THEORY | ENGINEERING, ELECTRICAL & ELECTRONIC | TRANSMISSION | REALIZATION | GENERATION | XOR
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12. Full Text Magneto Tuning of a Ferrite Dielectric Resonator Antenna Based on LiFe5O8 Matrix
by de Morais, J E. V and de Castro, A J. N and Oliveira, R G. M and do Carmo, F F and Sales, A J. M and Sales, J C and Silva, M A. S and Gouveia, D X and Costa, M M and Rodrigues, A R and Sombra, A S. B
Journal of Electronic Materials, ISSN 0361-5235, 7/2018, Volume 47, Issue 7, pp. 3829 - 3835
LiFe5O8 (LFO) spinel-like material has been studied for use in ferrite resonator antennas (FRAs). Antenna parameters such as gain and return loss were greatly... 
Solid State Physics | Materials Science | FRA | LFO | τ f | Optical and Electronic Materials | Electronics and Microelectronics, Instrumentation | Characterization and Evaluation of Materials | spectroscopy impedance | hysteresis | PHYSICS, APPLIED | MICROWAVE | MATERIALS SCIENCE, MULTIDISCIPLINARY | ELECTRICAL-PROPERTIES | LI0.5FE2.5O4 | tau(f) | CERAMICS | ENGINEERING, ELECTRICAL & ELECTRONIC | Magnetization | Coercivity | Radio antennas | Microwave frequencies | Dielectrics | Magnetic saturation | Tuning | Ferrites | Resonant frequencies | Microwave circuits | Materials research | Magnetism | Magnetic fields | Resonators | Gain | Hysteresis | Demagnetization | Magnetic properties
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13. Full Text Properties of the Sr3MoO6 electroceramic for RF/microwave devices
by Paiva, D.V.M and Silva, M.A.S and Sombra, A.S.B and Fechine, P.B.A
Journal of Alloys and Compounds, ISSN 0925-8388, 06/2018, Volume 748, pp. 766 - 773
The Sr MoO (SMO) double perovskite has been studied due to its photoluminescence properties. Herein, the aim of this work is to study the dielectric properties... 
Microwave | Dielectric resonator antenna | Sr3MoO6 | Electroceramic | MoO | MATERIALS SCIENCE, MULTIDISCIPLINARY | METALLURGY & METALLURGICAL ENGINEERING | OPTICAL-PROPERTIES | CHEMISTRY, PHYSICAL | POWDERS | RESONATOR ANTENNAS | PHOSPHOR | DOUBLE-PEROVSKITE | MAGNETIC-PROPERTIES | LOW SINTERING TEMPERATURE | MICROWAVE DIELECTRIC-PROPERTIES | CERAMICS
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14. Full Text Nonlinear graphene-based nanophotonic switch working in dense wavelength division multiplexing (DWDM) systems
by Wirth, A.J and Ferreira, A.C and Sombra, A.S.B
Applied Physics A: Materials Science and Processing, ISSN 0947-8396, 05/2017, Volume 123, Issue 5, p. 1
Fiber-based devices for operation in fully optical networks are relatively large in size and can not be used in photonic integrated circuits (PICs). We have... 
PHYSICS, APPLIED | PLASMONICS | PHOTONICS | MATERIALS SCIENCE, MULTIDISCIPLINARY
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15. Full Text Dielectric and microwave properties of common sintering aids for the manufacture of thermally stable ceramics
by Silva, M.A.S and Oliveira, R.G.M and Sombra, A.S.B
Ceramics International, ISSN 0272-8842, 11/2019, Volume 45, Issue 16, pp. 20446 - 20450
This work presents the dielectric properties of several oxides used as sintering aids for the manufacture of thermally stable ceramics in the radio frequency... 
Oxide | Microwave range | Impedance spectroscopy | sintering aid | MATRIX | DENSIFICATION | V2O5 | BEHAVIOR | BI2O3 | TIO2 ADDITION | MATERIALS SCIENCE, CERAMICS | COMPOSITE | CUO
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16. Full Text A new modulation method to generate all-optical logic gates in an AOTF
by Oliveira, M V. N and Coelho Jr, A G and Sobrinho, C S and Ferreira, A C and Sales, J C and Sousa, J R. R and Guimarães, G F and Menezes, J W. M and Lyra, M L and Sombra, A S. B
Microsystem Technologies, ISSN 0946-7076, 12/2017, Volume 23, Issue 12, pp. 5491 - 5503
We propose a new method of optical modulation using a conventional acousto-optic tunable filter. In this device the all-optical logic gates, namely AND and OR,... 
Electronics and Microelectronics, Instrumentation | Engineering | Mechanical Engineering | Nanotechnology | SYSTEM | NETWORK | PHYSICS, APPLIED | INTERFEROMETER | MATERIALS SCIENCE, MULTIDISCIPLINARY | NANOSCIENCE & NANOTECHNOLOGY | PPM | ENGINEERING, ELECTRICAL & ELECTRONIC | WAVE | TRANSMISSION | ACOUSTOOPTIC TUNABLE FILTER | RADIO-OVER-FIBER | BANDWIDTH
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17. Full Text Microwave filter characteristics of ferrite and polyaniline composites from 8.2 to 12.4 GHz
by Singh, Charanjeet and Bai, Yang and Narang, Sukhleen Bindra and Sombra, A S. B and Mishra, Sanjay R and Jotania, Rajshree and Khanna, Rajesh and Trukhanov, S V and Trukhanov, A V and Ghimire, Madhav
Journal of Materials Science: Materials in Electronics, ISSN 0957-4522, 8/2019, Volume 30, Issue 16, pp. 14923 - 14927
In this work, M-type hexagonal ferrite Ba0.5Sr0.5CoxZrxFe(12−2x)O19 and Polyaniline composites have been prepared. The microwave filter characteristics were... 
Optical and Electronic Materials | Characterization and Evaluation of Materials | Materials Science | PHYSICS, CONDENSED MATTER | PHYSICS, APPLIED | MAGNETIC-PROPERTIES | MATERIALS SCIENCE, MULTIDISCIPLINARY | ABSORPTION PROPERTIES | ENGINEERING, ELECTRICAL & ELECTRONIC | Waveguides | Electric filters | Iron compounds | Microwave devices | Electric properties | Ferrites | Dielectric loss | Composition | Composite materials | Bandstop filters | Microwave attenuation | Cobalt | Microwave filters | Polyanilines
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