Resonant Cavity
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. 3.4/4.0 GHz Tunable Resonant Cavity in SIW Technology Using Metal Post and PIN Diode on a Low-Cost Biasing Network for 5G Applications
Abstract This paper presents a dual-band resonant cavity in Substrate Integrated Waveguide (SIW) technology to operate in the range from 3.3 GHz to 4.2 GHz, spectrum considered for the Fifth Generation (5G) network. The cavity was designed to operate at 3.4 GHz and 4.0 GHz. To achieve different states, a jumper and a PIN diode switch are considered as switch
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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2. Generation of Non-diffraction Vortex Beam and Its Application in Digital Communication
Abstract An axicon-frustum basin-type Bessel resonator is designed for generating non-diffraction vortex beams with opposite propagation directions under different conditions. Based on the theory of geometric optics, the principle of creating vortex beams is analyzed in this axicon-frustum basin-shaped resonant cavity. It is shown that a non-diffraction vort
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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3. A Direct Approach for Coupling Matrix Synthesis for Coupled Resonator Diplexers
Abstract Diplexers are used to separate or combine two bands of frequencies and they are designed by combining channel filters using distribution circuit or alternatively designed based on coupled resonator circuits. Design parameters of coupled resonator circuits such as coupling coefficients, self-resonant frequencies and external couplings are done using
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-12
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4. Design and analysis of metallic photonic band gap cavity for a Gyrotron
Design and analysis of a 35 GHz metal photonic band gap (PBG) resonant cavity operating in the TE041-like mode has been presented. The dispersion characteristics of a 2D metal PBG structure comprising of triangular array of rods has been obtained using FDTD method. Global band gap regions have been obtained to be used for the PBG cavity design. A mode map ha
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2012-12
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5. Espectroscopia de cavidade ressonante tipo Ring-DOWN supercontinuum resolvida no tempo para detecção de multicomponentes gasosos / Supercontinuum Cavity Ring-Down Spectroscopy For Simultaneous Detection Of Multicomponent Gases
In this work, we present a variation of the technique CRDS (Cavity Ring-Down Spectroscopy) to obtain simultaneously a multicomponent absorption spectrum in a broad visible range. This new approach uses the Supercontinuum (SC) spectrum (resulting from irradiation of nonlinear media by femtosecond lasers, or simply generated by compact sources) as a light sour
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/10/2010
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6. Modelagem de dispositivos ópticos em escala nanométrica / Modeling of optical devices in nano scale
Dispositivos fotônicos têm estado continuamente no foco das pesquisas científicas, particularmente em aplicações para comunicações ópticas e sensoriamento. Por outro lado, as dimensões desses dispositivos são restringidas pelo limite de difração de Abbe. Esse limite tem se mostrado como o grande gargalo no desenvolvimento de novas tecnologias em
Publicado em: 2010
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7. Microlasers de cavidades estadio aplicados a detecção nanovolumetrica / Stadium cavities microlasers applied to the nanovolumetric detection
This work presents the development of resonant cavities based on chaotic billiard geometries built with semiconductor active optical medium for sensing applications. In spite of the classically chaotic behavior of the stadium, the quantum description of the problem in the semi-classical limit shows unexpected accumulations of the density of probability on cl
Publicado em: 2010
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8. Desenvolvimento de transdutores paramétricos de alta sensibilidade para o detector de ondas gravitacionais mario schenberg
- The main purpose of this work was to build a set of parametric transducers of reentrant cavity type with high sensitivity and pumped at to be used in the gravitational wave detector Mario Schenberg. These transducers will monitor the mechanical vibrations of the -diameter spherical antenna in the frequency range. Niobium with high Tantalum impurities and w
Publicado em: 2009
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9. Investigation of ultra-high sensitivity klystron cavity transducers for broadband resonant-mass gravitational wave detectors.
We show that, with a suitable choice of the parameters of the gravitational wave detector Mario Schenberg, with technological accessible parameters (using state-of-art electronics), its sensitivity curve can be improved over the current project curve to become competitive with interferometric detectors in a frequency band of ~1500 Hz, in the region from 1000
Publicado em: 2008
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10. Sistemas para manipulação quantica em estado solido / Towards an implementation of quantum manipulation in solid states
This thesis proposes and implements a system for quantum information processing, focusing primarily on the associated instrumentation. The basic physical aspects for computation, such as the associated energy and Shannon s entropy, were revisited. InAs:GaAs quantum dots were elected as the physical system of choice for this implementation; in particular, the
Publicado em: 2008
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11. Magnetically driven maser effect in the resonant dynamics of V15 molecular nanomagnets
Resonant dynamics of magnetic molecules with spin 1/2 ground state, such as V15, is theoretically studied. In our model calculation, crystals of this molecular nanomagnet are probed by time-dependent magnetic fields, which continuously invert populations of spin states. If the sample is placed in a resonant cavity, relaxation of excited states, via spin-phot
Brazilian Journal of Physics. Publicado em: 2007-09
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12. Uma nova proposta de antena planar multibanda para comunicações móveis
The great interest observed in wireless communication systems has required the development of new configurations of microstrip antennas, because they are easily built and integrated to other microwave circuit components, which is suitable for the construction and development of planar antenna arrays and microwave integrated circuits. This work presents a new
Publicado em: 2007