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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

Multiplexer Design For SATCOM Applications

Presented By: Arpit Patel

ME Electronics & Communication (CSE)

LD Engineering College

contents
Contents
  • Function Of Multiplexers
  • Overview of Designing of Dielectric resonant Filter
  • Overview of Designing of Waveguide Filter
  • Waveguide Manifold Designing
  • Multiplexer design
slide3

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)
multipath effect in satellite channels
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
example
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
multiplexer
Multiplexer

ANTENNA

Multiplexer

Manifold

Filter

n

Filter

1

Filter

2

Channel-1

Channel-2

Channel-n

slide7
DIELECTRIC RESONATOR (DR) FILTER :
    • SINGLE MODE DR FILTERS:

FULL WAVE RESPONSE OF 5-P DR FILTER (ANSOFT)

PHYSICAL STRUCTURE OF 5-P DR FILTER

slide8

Designing of Waveguide Filter

COUPLING SCREW AT 450

TE11 MODE FIELD CONFIGURATION

IN CIRCULAR WAVEGUIDE

COUPLING & ROUTING DIAGRAM FOR 6-P FILTER

slide9

PHYSICAL STRUCTURE OF FILTER

EM SIMULATED RESPONSE OF S-BAND

DOUBLY TERMINATED FILTER

EM SIMULATED RESPONSE OF S-BAND

SINGLY TERMINATED FILTER

menifold design
MENIFOLD DESIGN

TOWARDS ANTENNA

SHORT

CHANNEL -2

CHANNEL -3

CHANNEL -1

3-CHANNEL MENIFOLD

slide11

(a) Combline

(b) Herringbone

Common Configurations for Manifold Multiplexer

slide12
DESIGN OF HIGH POWER MUX:
    • Ku-BAND 12 CHANNEL MUX (EXAMPLE):

MECHANICAL LAYOUT OF Ku BAND MUX

future work
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

references
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