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Technologie des composants à hétérostructures pour les têtes de réception par satellite aux longueurs d'ondes millimétriques

Abstract : In this work, Single Barrier Varactor Diodes and Coplanar Wave-Guides on a membrane were fabricated and characterized in AC regime.
The Single Barrier Varactor consists on an heterostructure for a use in harmonic multiplication. This is possible because of the capacitance modulation wich leds to a generation of harmonics. In practice, the heterostructure is a blocking conduction layer of InGaAs/InAlAs/InGaAs or InGaAs/InAlAs/AlAs/InAlAs/InGaAs sample grown by Molecular Beam Epitaxy starting from an InP substrate. Samples exhibit very symetric Capacitance - Voltage characteristics. The best results led to a high capacitance contrast of 5.5 between 0 V and 6 V bias. We also investigted the same heterostructure in a stacked configuration with leakage currents as low as 10 A/cm² at 12 V.
Coplanar wave-guides deposited on thin Polyimide or Silicon Nitride dielectric films were studied as passive components. The propagation element can be compared to free space with a low relative dielectric index. Such structure were fabricated using micromachining technology of Gallium Arsenile. We demonstrated a constant high velocity of 2.9.108 m/s close to the velocity of the electromagnetic wave in air. It was also demonsrated that there is a predominance of metallic losses with a square root frequency dependence. Then we showed preliminary results of modelling filters at 250 GHz.
The potential applications of this devices are quazi-optical systems at millimeter and submillimeter wavelengths for detection systems.
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Contributor : Patrice Salzenstein <>
Submitted on : Thursday, June 1, 2006 - 12:13:11 PM
Last modification on : Wednesday, February 17, 2021 - 10:58:10 AM
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  • HAL Id : tel-00077055, version 2


Patrice Salzenstein. Technologie des composants à hétérostructures pour les têtes de réception par satellite aux longueurs d'ondes millimétriques. Mécanique []. Université des Sciences et Technologie de Lille - Lille I, 1996. Français. ⟨tel-00077055v2⟩



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