Analysis of Multipactor RF Breakdown in a Waveguide Containing a Transversely Magnetized Ferrite

Gonzalez-Iglesias, D.; Gómez, Ana Almaraz; Gimeno, B.; Fernández, Óscar Fernández; Vegas, Α.; Casas, Fernando; Anza, S.; Vicente, C.; Gil, J.; Boria, Vicente E.; Montero, I.; Raboso, D.

doi:10.1109/ted.2016.2614370

Cited by 13 publications

(3 citation statements)

References 19 publications

(26 reference statements)

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“…After that, theory model and production of multipactor have acquired many results to throw light on the multipactor phenomenon [2]- [9]. Numercial and simulation method are introduced to find out multipactor effects in highpower microwave devices [10]- [20]. These conclusions show that it occurs when electrons accelerated by intense electric fields are self-sustained via an avalanche due to the secondary electron emission.…”

Section: Introductionmentioning

confidence: 99%

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

2020

IEICE Electron. Express

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Multicarrier signals are used in many radio frequency and microwave systems. A typical example is the wideband communication satellites. However, it is rare to require the carriers in such multicarrier systems to be coherent due to the fact that their frequencies are different. An exception is the testing system for Multipactor Sensor System(MSS). Compared with existing methods that rely on the heavy use of expensive microwave instruments, in this work, we demonstrate an ultra-wideband coherent multicarrier generator (UCMG) with commercial chips and economic devices, which works from UHF to Ku band. MSS experimental results verified the novelty and effectiveness of the proposed approach. The implemented UCMG would make it affordable for a regular microwave laboratory to conduct quantitative experimental researches on wideband multicarrier multipactors. It can also be widely used in other RF systems such as massive MIMO and large-scale phase array systems.

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Section: Introductionmentioning

confidence: 99%

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

2020

IEICE Electron. Express

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“…The simple parallel plate approach has also been used to model the multipactor effect in a waveguide containing magnetized ferrite [15], [16]. However, realistic nonreciprocal microwave components (e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Multipactor Effect for Ferrite Materials Used in L- and S-Band Nonreciprocal Microwave Components

Vague

Melgarejo

Boria

et al. 2019

IEEE Trans. Microwave Theory Techn.

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This paper reports on the experimental measurement of power threshold levels for the multipactor effect between samples of ferrite material typically used in the practical implementation of Land S-bands circulators and isolators. For this purposes, a new family of wide-band, non-reciprocal rectangular waveguide structures loaded with ferrites has been designed with a full-wave electromagnetic simulation tool. The design includes also the required magneto-static field biasing circuits. The multipactor breakdown power levels have also been predicted with an accurate electron tracking code using measured values for the Secondary Electron Yield (SEY) coefficient. The measured results agree well with simulations thereby fully validating the experimental campaign.

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“…SEY is a limiting factor for many vacuum-related industries and therefore has a great economic importance. For example, a high SEY is the main cause of the onset of an electron avalanche, called multipactor effect, in high- power RF devices in space 1–3 , as well as the electron cloud (EC) effect in large accelerators 4–6 . It is also fundamental for other charging phenomena in satellites 7 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic secondary electron emission in rough composite materials

Olano

Dávila

Dennison

et al. 2019

Sci Rep

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The interaction of ionizing radiation with matter is of critical importance in numerous areas of science and technology like space and vacuum technology and even medicine and biotechnology. Secondary electron emission is a consequence of electron irradiation on materials. We achieve extremely low secondary electron emission yield values smaller than 0.2, even up to incident electron energies ~1 keV, due to an undocumented synergy between neighbouring metal and dielectric domains in composite samples. To investigate this experimental discovery, we propose a simple 3D model where the dielectric and metallic domains are arranged in parallel and interleaved. The proposed surface profile has a triangular shape to model the surface roughness. We obtain a continuous equation to describe the electric field that arises between grounded conductors and charged dielectrics domains. The calculated trajectories of secondary electrons in this 3D geometry are used to predict dynamic secondary emission yield, which strongly depends on the charge accumulated in the dielectric domains. This research paves the way to design new materials of low secondary emission yield, addressing the technological problem not yet resolved to inhibit the electron avalanche in RF equipment that limit their maximum working power.

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Analysis of Multipactor RF Breakdown in a Waveguide Containing a Transversely Magnetized Ferrite

Cited by 13 publications

References 19 publications

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

Ultra-wideband generator of coherent multicarriers for multipactor sensor system

Experimental Validation of Multipactor Effect for Ferrite Materials Used in L- and S-Band Nonreciprocal Microwave Components

Dynamic secondary electron emission in rough composite materials

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