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Telecoms, Antennas, Microwaves

• 30 h - Telecoms lectures and tutorial (10h), Antennas/Microwaves lectures and tutorial (12h), Experimental work (8h)
• Experimental project: no
• Description:
  • Telecoms Basics of source and channel coding. Channel capacity. Basics of digital modulation and demodulation. Practical case of transmissions from space instruments.
  • Antennas, Microwaves Basics of guided waves and antenna theory. Antenna pattern, gain, and impedance. Friis formula of radio link budget. Practical antennas and arrays for space instruments. Up and down conversion for signal transmission. Heterodyne detection. Receiver and system equivalent noise temperature. Critical microwave emitters and receivers technologies for space instruments up to sub-millimeter wavelengths.
  • Experimental work
    • Students will characterize the antenna pattern of a 3-meter dish antenna working at a 1.4GHz using the sun as a quasi-point source. They will estimate the directivity of the antenna and compare it to estimated values based on the aperture size and with 3D-electromagnetic simulations performed on Ansys HFSS.
    • Students will measure the receiver equivalent noise temperature of microwave amplifiers using a cryogenic matched load, a noise source, a power meter and a spectrum analyzer. They will compare and analyze the results. Alternatively, they will perform a similar measurement on the 1.4 GHz receiver of the SRT using its internal noise source and a cryogenic load.
• Description:
  • Télécoms Bases sur le codage de la source et des canaux. Capacité des canaux. Bases sur modulation digitale et la démodulation. Cas pratiques de transmission depuis les instruments spatiaux.
  • Antennes, Micro-ondes Bases sur les guides d'onde et théorie des antennes. Lobe d'antenne, gain, et impédance. Formule de Friis et budget des liens radio. Antennes en pratique et matrices pour les instruments spatiaux. Conversion haut et bas pour la transmission du signal. Détection Hétérodyne. Récepteurs et température de système. Émetteurs micro-ondes critiques et technologie des récepteurs pour les instruments spatiaux jusqu'aux longueurs d'ondes sub-millimétriques.
  • TP microondes / détection 2 x 4h