Literatura académica sobre el tema "Fréquences d'ondes millimétriques"
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Tesis sobre el tema "Fréquences d'ondes millimétriques"
Carrizales, Juarez Ricardo. "Radiation pattern reconfigurable antennas based on Phase Change Materials (PCM) integration". Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0003.
Texto completoThis work focuses on the study, characterization and optical activation of thin films of phase change materials (PCM) for their integration in high-frequency reconfigurable devices, in particular antenna systems. The principle of reconfiguration is achieved by exploiting the high contrast in resistivity of PCMs between its amorphous state (high resistivity) and crystalline state (low resistivity). This change of state is non-volatile and reversible and is achieved by a short laser pulse. The electromagnetic properties of PCMs were also characterized in the millimeter-wave band frequency (around 30 GHz) and used for the design and accurate simulation of a multi-reconfigurable (in polarization state and operational frequency) array of antennas working at frequencies around 30 GHz
Tanguy, Olivier. "Multiplicateurs de fréquence à hétérostructures III-V aux longueurs d'ondes millimétrique et submillimétrique". Lille 1, 1995. http://www.theses.fr/1995LIL10202.
Texto completoMaestrini, Alain. "Modélisation et conception de multiplicateurs de fréquence utilisant des diodes planaires aux longueurs d'ondes millimétriques et submillimétriques". Brest, 1999. http://www.theses.fr/1999BRES2038.
Texto completoDherbecourt, Pascal. "Etude et réalisation d'un générateur d'onde optique modulée en amplitude à très haute fréquence". Rouen, 2002. http://www.theses.fr/2002ROUES031.
Texto completoThe originality of this work is to build a source for the generation of an amplitude modulated optical wave up to 275 GHz using heterodyning of two 1550 nm DFB lasers. We carry out a study concerning the lasers spectral width influence on the spectral purity of the signal generated in a fast photodiode. The experimental setup is described, as well as characterization of the two lasers spectral width. Photodiode signal is controled by a radio-frequency spectrum analyser up to 60 GHz. Our laboratory has developed an experimental fusion setup by CO2 laser that enables the realization of numerous fiber optical components. We developed a new approach by characterizing their behavior under a fast variation of the input powwer, so as to get valuable information concerning their high rate bandwidth. Photodiode and optical components bandwidth measurements are presented and discussed
Hallal, Ayman. "Génération d'ondes millimétriques et submillimétriques sur des systèmes fibrés à porteuses optiques stabilisées". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S005/document.
Texto completoI report in this manuscript a theoretical and experimental study of a compact, reliable and low cost source of 30 Hz linewidth, continuous and coherent electromagnetic waves tunable from 1 GHz to 500 GHz in steps of 1 GHz. These waves are generated by photomixing two distributed feedback (DFB) laser diodes at 1550 nm which are frequency stabilized with orthogonal polarizations on the same optical fibered Fabry-Perot cavity. I have designed very fast electronic control filters for each laser allowing a 7 MHz servo bandwidth limited by the loop length. I demonstrate phase noise suppressions down to -60 dBc/Hz at 1 kHz and -90 dBc/Hz at 100 kHz offset frequencies from a 92 GHz electrical carrier. I also measure a ~170 kHz frequency drift of the beat note at 10 GHz on the long term over a continuous 7.5 hour locking period. I show an optimized design of an integrated servo loop of few tens of cm length which reduces the phase noise by 18 dB at 1 MHz optical carrier offset frequency and the phase-amplitude couplings in the cavity by a factor of 50 compared to the experimental one. The addition of a third DFB laser phase stabilized on a local oscillator allows the possibility to have continuously tunable source over 1 THz. The continuous wave source also makes it possible to generate fixed repetition rate pico- or femtosecond pulses from highly non-linear and dispersive fibers, replacing the DFB lasers by further stable lasers. I have calculated by simulation 7.2 fs temporal jitter at 40 GHz repetition rate over a 1 ms integration time
Rennesson, Stéphanie. "Développement de nouvelles hétérostructures HEMTs à base de nitrure de gallium pour des applications de puissance en gamme d'ondes millimétriques". Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00943619.
Texto completoWang, Hui. "Conception et modélisation de circuits monolithiques à diode Schottky sur substrat GaAs aux longueurs d'onde millimétriques et submillimétriques pour des récepteurs hétérodynes multi-pixels embarqués sur satellites et dédiés à l'aéronomie ou la planétologie". Phd thesis, Observatoire de Paris, 2009. http://tel.archives-ouvertes.fr/tel-00608222.
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