Experimental Analysis of the Multipactor Effect With RF Pulsed Signals

Gonzalez-Iglesias, D.; Belda, Oscar Monerris; Díaz, María Elena; Gimeno, B.; Boria, Vicente E.; Raboso, D.

doi:10.1109/led.2015.2468068

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…Due to the strong push in digital communications for satellite and terrestrial applications, RF measurement technology has improved dramatically in recent years [9], [16]. Current hardware is capable of directly measuring the amplitude and phase information, known as IQ data, with high accuracy.…”

Section: Microwave Nullingmentioning

confidence: 99%

“…However, with increasing complexity in terms of geometry [3], [4], materials [5], [6], and surface finishing, achieving accurate multipactor simulations becomes a challenge. Modeling tools have seen large advances recently [7]- [9], and simulations with modulated signal [10], [11], space charge [12], multiple materials [13], [14], or simple noise characterization [15] are common nowadays. All of these advances in the simulation field are driving designers to request that their devices are tested against the same conditions that they were simulated-in terms of RF power, signal modulation, and temperature [16].…”

Section: Introductionmentioning

confidence: 99%

“…Also, this detection method provides the same sensitivity for CW signals, improves the accuracy when dealing with modulated signals-such as the ones used in [9] and [10]and requires less RF components to set up. Furthermore, the proposed method benefits from its high detection rate.…”

Section: Introductionmentioning

confidence: 99%

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High Power RF Discharge Detection Technique Based on the In-Phase and Quadrature Signals

Monerris-Belda¹,

Marin²,

Jodar³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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High power radio frequency (RF) breakdown testing is a subject of great relevance in the space industry, due to the increasing need of higher transmission power and smaller devices. This work presents a novel RF breakdown detection system, which monitors the same parameters as the microwave nulling system but with several advantages. Where microwave nulling-a de facto standard in RF breakdown testing-is narrowband and requires continuous tuning to keep its sensitivity, the proposed technique is broadband and maintains its performance for any RF signal. On top of that, defining the detection threshold is cumbersome due to the lack of an international standardized criterion. Small responses may appear in the detection system during the test and, sometimes, it is not possible to determine if these are an actual RF breakdown or random noise. This new detection system uses a larger analysis bandwidth, thus reducing the cases in which a small response is difficult to be classified. The proposed detection method represents a major step forward in high power testing as it runs without human intervention, warning the operator or decreasing the RF power automatically much faster than any human operator.

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Section: Microwave Nullingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Power RF Discharge Detection Technique Based on the In-Phase and Quadrature Signals

Monerris-Belda¹,

Marin²,

Jodar³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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“…The analysis of the multipactor discharge in coaxial guides has been run using a custom simulation tool [86,38,28]. This code performs an individual tracking of a set of electrons in a 3D structure.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Also, this detection method provides the same sensitivity for CW signals, improves the accuracy when dealing with modulated signals -such as the ones used in [86,62]-because of its wider bandwidth and digital signal processing and requires fewer RF components to set up.…”

Section: Discussionmentioning

confidence: 99%

Advanced Techniques for Multipactor Testing

Belda¹

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ehexgih igrxsi py wvsegy isxq ysr wonerris feld hesis dvisorX hrF iente iF fori isert hesis oEdvisorX hrF fenito qimeno wrt¡ %nez hh hesis presented t niversitt olit eni de l eni leniD tnury PHPQ Abstract sn the reent pstD there hs een prolifertion of new stellite systemsD espeilly the lrge onstelltions in the vow irth yrits @viysAF xerly ll stellites now rry digitl tr0 with vriety of modultions nd power levelsF xot only thtD the usiness model requires rpid deployment of stellitesD putting enormous onstrints for the suppliers of mirowve pylod hrdwreF e key risk re for suh equipment remins the multiptor rekdown under moderte to high power levelsF ywing to the inherent rndomness of the multiptor phenomenonD ustomers tend to dd extr design mrgins for the high power mirowve omponentsF his results in higher ostsD ulkier devies nd longer time for testingF fsed on personl experiene in multiptor testingD the prime motivtor for the work desried in the thesis hs een to undertke omprehensive review of this phenomenon nd develop utting edge multiptor test pilitiesD providing mens for the rpid multiptor testing under vriety of wideEnd modulted signlsF he thesis disserttion shows tht nlog nd digitl modultions hve signi(nt impt in the multiptor thresholdF he short nd longEterm multiptor regimes re lso nlyzedD regimes thtD in some sesD hve very di'erent multiptor thresholds for the sme ritil gpF he need to redue the mirowve pylod weight y using multirriers in single trnsponder provides n exellent option for designersF fy routing severl signls through the sme devieD the pylod weight is drmtilly reduedF gommeril solutions for multirrier testing re not suitle euse of the high power levels requiredF everl strtegies to implement multiptor test enhes with ontrollle prmeters re presentedF esults prove tht the signl eing fed to the devie under tests is urte nd stle over timeF pinllyD novel multiptor detetion system is proposed to ope with multiptor detetion when modulted nd multirrier signls of ny ndwidth re usedF his method hs the sme sensitivity s the well known mirowve nulling for ontinuous wve signls nd surpsses it for modulted signlsF he digitl signl proessing used to detet the multiptor ptterns provides full utonomous detetion methodF Contents eknowledgments v esum vi

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Direct observation of electrons in microwave vacuum components

Shaw

García

Powell

et al. 2019

Review of Scientific Instruments

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Apparatus which is used to directly observe electrons in microwave vacuum components was designed and implemented into a WR-284 like waveguide operated at 2.85 GHz with up to approx. 1 MW power. To generate desired electric field levels for driving secondary emission, the waveguide structure is manipulated by reducing the test section height to 6 mm from the standard WR-284 rectangular waveguide height of 34 mm. Both test and standard sections were operated in the dominant TE10 mode. A 1 mm aperture was cut into the broadside wall of the waveguide section enabling a portion of electrons in the waveguide to enter a properly biased electron multiplier tube mounted atop of the test section. Waveforms are presented showing the direct measurement of electrons, providing a local detection method with nanosecond temporal resolution. Future work will incorporate the test setup for multipactor studies.

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Experimental Analysis of the Multipactor Effect With RF Pulsed Signals

Cited by 11 publications

References 8 publications

High Power RF Discharge Detection Technique Based on the In-Phase and Quadrature Signals

High Power RF Discharge Detection Technique Based on the In-Phase and Quadrature Signals

Advanced Techniques for Multipactor Testing

Direct observation of electrons in microwave vacuum components

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