Contribution à l'étude de micro-dispositifs de protection des circuits radiorécepteurs aux impulsions hyperfréquences de puissance associant microtechnologies et phénomènes d'émission électronique

Abstract : Future electronic warfare systems will face new challenges:
- to detect and recognize various signals with broader frequencies and with lower power levels,
- to be insensitive to jamming systems.
A power limiter placed right after a receiving antenna is aimed at avoiding saturating or damaging sensitive components such as low noise amplifiers.
The aim of this study financed by the French Ministry of Defense (DGA) through a doctoral grant is to develop such devices with improved performances compared to nowadays components. A brief bibliographic synthesis on high power microwave sources combined with a system study will lead to the power limiter specifications. The comparison with military and civilian certification thresholds will emphasise on systems vulnerability leading to the need of developing a new kind of power limiter.
Various power limiter technologies including ferroelectric, superconducting materials or semiconductors have been reviewed and compared to the specifications and constraints linked to the applications. None of them seems to fulfil all the requirements for aeronautics or military scenarios.
Therefore this work will emphasise on another kind of technology based on vacuum electronics. Principles and physics linked to electron emission will be studied.
The proposed limiter is thus based on progressive microwave power dissipation along a transmission line by distributed vacuum diodes. Dimensioning such devices will require electromagnetic and charged particles simulators.
Those components will be fabricated in clean room at ESIEE. Given their sensitivities to the environment, a proper package has been developed based on silicon-glass anodic bonding and electromagnetic coupling to ensure hermeticity. Indeed depending on the packaging environment power will be dissipated by either electron field emission or plasma discharge.
Performances have been measured between 0 GHz and 40 GHz. Insertion losses coming from the package and the power limiter itself have been evaluated. Low loss power limiter can be obtained.
High power evaluations have also been studied. Some samples have sustained multiple pulses up to 2 kW in X-band. Recordings have indicated effective power limitation and demonstrated the proof of concept of power limiter based on vacuum electronics.
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Contributor : Alain Phommahaxay <>
Submitted on : Wednesday, December 12, 2007 - 7:58:08 PM
Last modification on : Wednesday, March 20, 2019 - 4:51:11 PM
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  • HAL Id : tel-00196509, version 1

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Alain Phommahaxay. Contribution à l'étude de micro-dispositifs de protection des circuits radiorécepteurs aux impulsions hyperfréquences de puissance associant microtechnologies et phénomènes d'émission électronique. Matière Condensée [cond-mat]. Université de Marne la Vallée, 2007. Français. ⟨tel-00196509⟩

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