Search results for " dielectric resonator"

showing 3 items of 3 documents

A DRO-based X-band injection-locked amplifier without input non-reciprocal elements

2009

Conventional design of injection-locked amplifiers (ILA's) implies the use of a non-reciprocal (ferrite, usually) element for separating the input signal from the synchronized output signal. In this paper a novel topological structure is proposed which permitted the realization of a wide-band, transmission-type, ILA with no need for separating input-port isolator or preamplifier. The prototype, realized in HMIC technology, while intended only as demonstrator of the newly proposed approach in the design of ILA's, shows quite satisfactory performances at X-band, with a simple, compact and low-cost structure.

Engineeringbusiness.industryPreamplifierAmplifierBandwidth (signal processing)IsolatorX bandElectrical engineeringila rila tila injection x-band branchline coupler dielectric resonatorDielectric resonatorSettore ING-INF/01 - ElettronicaElectronic engineeringFerrite (magnet)businessReciprocal2009 European Conference on Circuit Theory and Design
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Vortex motion in Nb/PdNi/Nb trilayers: new aspects in the flux flow state

2011

We study the dynamics of vortex lines in Supercondutor/Ferromagnet/Superconductor (SFS) heterostructures at microwave frequencies. We have employed swept-frequency, Corbino-disk and resonant, dielectric-resonator techniques to obtain the field and temperature dependence of the vortex-state parameters. We concentrate here on the genuine flux-flow resistivity $\rho_{ff}$, that we access at subcritical currents using a sufficiently high driving frequency. We find that $\rho_{ff}$ does not follow the well-known Bardeen-Stephen model. Instead, it is well described by a full time-dependent Ginzburg-Landau expression at very thin F layer thickness, but changes to a previously unreported field-depe…

SuperconductivityMaterials scienceField (physics)Condensed matter physicsCondensed Matter - SuperconductivityEnergy Engineering and Power TechnologyFOS: Physical sciencesDielectric resonatorVorticityCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectElectronic Optical and Magnetic MaterialsVortexSuperconductivity (cond-mat.supr-con)FerromagnetismElectrical resistivity and conductivityCondensed Matter::SuperconductivityElectrical and Electronic Engineeringsuperconductors; nb; mixed state; s/f hybrids; dielectric resonator; resistance; vortex dynamics; surface impedance; corbino disk; vortices; temperatureMicrowave
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Céramiques diélectriques commandables pour applications micro-ondes : composites à base de titanate de baryum-strontium et d'un oxyde non ferroélectr…

2001

Since the last decades, dielectric ceramics have been considered as attractive for microwave applications as tunable dielectric resonators or phase shifters. For that, ceramic devices should be tunable – change in dielectric constant with applied voltage- with moderate to low dielectric constant (30 to 1000) and loss tangent as low as possible. To reconcile these properties, composite ceramics based on Ba0.6Sr0.4TiO3 (BSTO) and a non-ferroelectric oxide with a low dielectric constant (MgTiO3 or MgO) were synthesised. The aim of this study was to correlate the microstructure with the dielectric properties, especially the Curie temperature and the dielectric relaxation phenomena.Ceramics with…

attrition[CHIM.MATE] Chemical Sciences/Material chemistrydielectric lossescomposites ceramicsmicrostructurepertes diélectriquesbarium-strontium titanatemicrowave dielectricstunable dielectric resonatorscéramiques compositesdiélectriques hyperfréquencestitanate de baryum-strontiumattrition milling[ CHIM.MATE ] Chemical Sciences/Material chemistryrésonateurs diélectriques accordables[PHYS.COND] Physics [physics]/Condensed Matter [cond-mat][ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat]
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