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Theses

Dispositif radiofréquence millimétrique pour objets communicants de type Smart Dust

Abstract : The emergent systems of “Smart dust” use networks of several hundreds of millimetre scaled devices. Each device integrates sensor and communication functions in order to be consulted by one or more transmitters.Regular progress in micro-technology and circuit's design accelerate the realization of compact devices containing one or more sensors, analogical and numerical circuits, communication systems and power source. One of the critical points of the system, object of many research tasks, is the communication system of the network of sensors. The objective of the thesis is to study a radio frequency communication system adapted to the needs of smart dust network. More precisely, it is a question of studying the feasibility of Emission-Reception devices functioning at the millimetre-length frequencies with principal constraints the reduced size and low power consumption of the system.
The first part provides a state of the art of the various components of a radiofrequency transceiver operating at millimetric frequencies. The second part is devoted to the study of SOI based interconnection structures, including coplanar strip and coplanar waveguide transmission lines. The third part deals with the case of a dipole integrated on SOI and operating at 60 GHz. This last study is based on the parameters of the SOI technology as permittivity, the resistivity and thickness of silicon. A model of the dummies of the SOI technology, based on the dynamic model of Tretyakov is proposed.
The final part is devoted to the design, implementation, and measurement of antennas integrated on SOI and operating in the 60 GHz band. Four types of antennas are presented including an interdigitated dipole, an IFA antenna, a double slot antenna and in the end a spiral antenna. These antennas were characterized and the comparison of the S parameters shows good correspondence between the measured and simulated results. In addition, a device test is presented to measure the gain pattern of these antennas. Finally, in an objective of a front end receiver, a codesign of a Low noise amplifier and an integrated antenna, both operating at 60 GHz, is proceed to eliminate the need of 50 ohms constraint.
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https://tel.archives-ouvertes.fr/tel-00258878
Contributor : Julien Moussa Barakat <>
Submitted on : Friday, October 17, 2008 - 7:08:17 PM
Last modification on : Friday, November 6, 2020 - 4:04:19 AM
Long-term archiving on: : Tuesday, September 21, 2010 - 5:25:35 PM

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  • HAL Id : tel-00258878, version 2

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CNRS | CEA | UGA

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Moussa Barakat. Dispositif radiofréquence millimétrique pour objets communicants de type Smart Dust. Micro et nanotechnologies/Microélectronique. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00258878v2⟩

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