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Presentation of the 3 rd year project

Presentation of the 3 rd year project. WIRED GAP. CHENAIS Jérémy JARQUE Nicolas FREMONT Sébastien SIMONNET Raphaël. Wired Gap. Introduction Presentation of the 3 parts Modifications and adaptation of the module of reception Amplifier Retransmission Conclusion. Introduction.

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Presentation of the 3 rd year project

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  1. Presentation of the 3rdyearproject WIRED GAP CHENAIS Jérémy JARQUE Nicolas FREMONT Sébastien SIMONNET Raphaël

  2. Wired Gap • Introduction • Presentation of the 3 parts • Modifications and adaptation of the module of reception • Amplifier • Retransmission • Conclusion

  3. Introduction • Subject: realisation of a wired gap • Use: retransmission of satellites signals in non-covered areas • Low-cost project

  4. Modifications and adaptation • Use of an existant parabola reception module: • Low cost than creating a new one • Easy to extract signals • Adaptation of this module: • Conception • Simulation

  5. Modifications

  6. Modifications • Horizontal polarization: • Implantation of a transistor to amplify the signal • Add of electric wire to supply power • Extraction of the signal

  7. Modifications • Vertical polarization: • Implantation of a transistor to amplify the signal • Add of electric wire to supply power • Extraction of the signal

  8. Modifications • Output for horizontal and vertical polarization signals

  9. Modifications • Power supply for both of transistors

  10. Adaptation • Necessity to export the signal in 50Ω at the entry of amplifier part: • Conception • Simulation • Realisation

  11. Adaptation - Conception • Adaptation for horizontal polarization: =>Difficulty because very disadapted

  12. Adaptation - Simulation

  13. Adaptation - Conception • Adaptation for vertical polarization: • Easier than horizontal polarization • Smaller circuit than previous

  14. Adaptation - Simulation

  15. - Low noise amplification - Compensation of losses in free space - very low power involved (some pW)‏ Amplifier – Simulation part

  16. Amplifier – Simulation part Gain Return loss

  17. Amplifier – Simulation part Gain Return loss

  18. Amplifier – Simulation part

  19. Amplifier – Conception part • Conception of the mask and the circuit • Test of the transistor at IETR • Analysis of results : • comparisonwiththeory • Calculation of the number of levels • Conception of the amplifier (whenresultswereworthwhile) • Test of the amplifier

  20. Amplifier – Conception part Circuit of the amplifier

  21. Amplifier – Conception part • Final results , three solutions: • Retry with co-planar technology • Modify the position of components • Change of substrate : => drawback: the cost increase

  22. Retransmission antenna • Aim : • To emit (or to broadcast) a signal in the bandwith from 10,7 to 12,7 Ghz • Solution considered first : • Simple patch antenna • Double polarization • Adopted solution : • Patch antenna network • Double polarization

  23. Simple patch antenna • Advantages : • Simplicity of the circuit • Simplicity of adjustments • Speed of simulation • Drawback : • Isotropic antenna

  24. Patch antenna network • Advantage : • Directed radiation diagram • Drawbacks : • Complex circuit • Very heavy simulation

  25. Realization steps • Calibration of the antenna's characteristics (only one patch)‏ • Installation of the network • Simulations and results

  26. Conclusion • Low cost and important gain • Easy to use • No visual pollution

  27. Debate Questions ?

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