Search results for "Coaxial waveguides"

showing 4 items of 4 documents

Efficient FDTD analysis of discontinuities in a square coaxial waveguide

1996

Engineeringbusiness.industryAcousticsFinite-difference time-domain methodElectronic engineeringCoaxial waveguidesElectrical and Electronic EngineeringClassification of discontinuitiesCondensed Matter PhysicsbusinessAtomic and Molecular Physics and OpticsSquare (algebra)Electronic Optical and Magnetic MaterialsMicrowave and Optical Technology Letters
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Multipactor RF Breakdown in Coaxial Transmission Lines With Digitally Modulated Signals

2016

The aim of this paper is the study of the RF multipactor breakdown in coaxial transmission lines excited by a single carrier with a digitally modulated signal. Employing an in-house developed code, numerical simulations are performed to determine the RF multipactor voltage threshold for several digitally modulated signals under different modulations schemes: quadrature phase-shift keying, 16-quadrature amplitude modulation, 16-amplitude and phase-shift keying, and 32-amplitude and phase-shift keying. Moreover, a coarse method based on the envelope integration to determine the RF multipactor voltage threshold when involving arbitrary digital modulations is also presented. These results are a…

Multipactor effectEngineeringAcoustics02 engineering and technology01 natural sciences010305 fluids & plasmasHarmonic analysisAmplitude modulationDigital modulationTEORIA DE LA SEÑAL Y COMUNICACIONES0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectronic engineeringElectrical and Electronic EngineeringQuadrature amplitude modulation (QAM)Coaxial waveguidesbusiness.industry20-gap-crossing ruleRoot-raised-cosine filterRF breakdown020206 networking & telecommunicationsKeyingElectronic Optical and Magnetic MaterialsElectric power transmissionAmplitude and phaseshift keying (APSK)Multipactor effectRadio frequencybusinessQuadrature phase-shift keying (QPSK)Phase-shift keyingVoltageIEEE Transactions on Electron Devices
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Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

2014

The main aim of this paper is the analysis of the feasibility of employing permanent magnets for the multipactor mitigation in a coaxial waveguide. First, the study of a coaxial line immersed in a uniform axial magnetic field shows that multipactor can be suppressed at any RF if the external magnetic field is strong enough. Both theoretical simulations and experimental tests validate this statement. Next, multipactor breakdown of a coaxial line immersed in a hollow cylindrical permanent magnet is analyzed. Numerical simulations show that multipactor can be suppressed in a certain RF range. The performed experimental test campaign demonstrates the capability of the magnet to avoid the multip…

Multipactor effectMaterials scienceElectron multiplicationbusiness.industryElectrical engineeringRF breakdownPACTORAccelerators and Storage RingsElectronic Optical and Magnetic MaterialsMagnetic fieldPermanent magnetOpticsDC magnetic fieldMagnetTEORIA DE LA SEÑAL Y COMUNICACIONESCoaxial waveguidesCoaxial lineMultipactor effectCoaxial waveguideElectrical and Electronic EngineeringMultipactor mitigationbusinessIEEE Transactions on Electron Devices
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Experimental Analysis of the Multipactor Effect With RF Pulsed Signals

2015

The main goal of this letter is the analysis of the multipactor effect within a coaxial waveguide excited by an RF pulsed signal. The variation of the multipactor RF voltage thresholdwiththe ON interval length of the pulse has been analyzed. To reach this aim, an in-house multipactor simulation code based on the Monte-Carlo algorithm has been implemented. The numerical simulations show that the multipactor RF voltage threshold increases as the ON pulse interval diminishes. In addition, an experiment was carried out to validate the proposed theoretical model, and demonstrating the excellent agreement between the theory and the experimental data. Finally, the results are compared with the 20-…

Multipactor effectbusiness.industry20-gap-crossing ruleRF breakdownInterval (mathematics)SignalElectronic Optical and Magnetic MaterialsPulse (physics)Threshold voltageOpticsTEORIA DE LA SEÑAL Y COMUNICACIONESElectronic engineeringRF pulseCoaxial waveguidesRadio frequencyMultipactor effectElectrical and Electronic EngineeringCoaxial waveguidebusinessVoltage
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