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Multiplexer Design For SATCOM Applications

Multiplexer Design For SATCOM Applications. Presented By: Arpit Patel ME Electronics & Communication (CSE) LD Engineering College. Contents. Function Of Multiplexers Overview of Designing of Dielectric resonant Filter Overview of Designing of Waveguide Filter

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Multiplexer Design For SATCOM Applications

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  1. Multiplexer Design For SATCOM Applications Presented By: Arpit Patel ME Electronics & Communication (CSE) LD Engineering College

  2. Contents • Function Of Multiplexers • Overview of Designing of Dielectric resonant Filter • Overview of Designing of Waveguide Filter • Waveguide Manifold Designing • Multiplexer design

  3. FUNCTION OF MULTIPLEXERS • Channelizing the frequency (necessary due to non-linearity of TWTA) • Power per carrier & EIRP increased • Division of received signals - I/P Multiplexers (IMUX) • Recombining of amplified signals - O/P Multiplexers (OMUX)

  4. MULTIPATH EFFECT IN SATELLITE CHANNELS • Channelization of received signals to minimize inter-modulation generation in high power amplifiers • Incoming signal may take as many coherent paths as there are number of transponders • Leakage through each path adds in coherent manner at the OMUX output • Amplitude & phase response of the channel changes due to leakage path • Sensitive to difference in gain between adjacent transponders

  5. Example: • Ku-band INSAT-4CR Communication Payload: • Available bandwidth : 480 MHz • Number of transponders = 12 • Available bandwidth / Transponder = 40 MHz • No. of TWTAs = 12 • TWTA O/P Power = 140 Watts

  6. Multiplexer ANTENNA Multiplexer Manifold Filter n Filter 1 Filter 2 Channel-1 Channel-2 Channel-n

  7. DIELECTRIC RESONATOR (DR) FILTER : • SINGLE MODE DR FILTERS: FULL WAVE RESPONSE OF 5-P DR FILTER (ANSOFT) PHYSICAL STRUCTURE OF 5-P DR FILTER

  8. Designing of Waveguide Filter COUPLING SCREW AT 450 TE11 MODE FIELD CONFIGURATION IN CIRCULAR WAVEGUIDE COUPLING & ROUTING DIAGRAM FOR 6-P FILTER

  9. PHYSICAL STRUCTURE OF FILTER EM SIMULATED RESPONSE OF S-BAND DOUBLY TERMINATED FILTER EM SIMULATED RESPONSE OF S-BAND SINGLY TERMINATED FILTER

  10. MENIFOLD DESIGN TOWARDS ANTENNA SHORT CHANNEL -2 CHANNEL -3 CHANNEL -1 3-CHANNEL MENIFOLD

  11. (a) Combline (b) Herringbone Common Configurations for Manifold Multiplexer

  12. DESIGN OF HIGH POWER MUX: • Ku-BAND 12 CHANNEL MUX (EXAMPLE): MECHANICAL LAYOUT OF Ku BAND MUX

  13. 7-channel Ku-band Mux:

  14. EM SIMULATED RESPONSE OF 7 channel Ku-Band MULTIPLEXER

  15. Future work: Achieve Sharp cutoff for a pass band • Ratio of the Usable Bandwidth / Available Bandwidth is Utilization of the Frequency Spectrum is 90 % because we have to include guard bands Use of Saw filters in Satellites to make them small

  16. References • [1] C. Wang, K. A. Zaki, A. E. Atia and T. G. Dolan, “Dielectric combline resonators and filter”, IEEE Trans. Microwave Theory and Tech., Vol. MTT-46, pp2501-2506, Dec. 1998. • [2]Http://www.ee.bilkent.edu.tr/~microwave/programs/magnetic/mfilters/theory.htm • [3]. Temes, G.C. and Mitra, S.K., Modern Filter Theory and Design, Wiley, 1973

  17. THANK YOU

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