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SDARS Receiver Front-End (Design Review)

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SDARS Receiver Front-End (Design Review) Albert Kulicz Greg Landgren Advisor: Prasad Shastry Outline Overview Goals Tasks for Semester Antenna LNA Network Fabrication ... – PowerPoint PPT presentation

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Title: SDARS Receiver Front-End (Design Review)


1
SDARS Receiver Front-End(Design Review)
  • Albert Kulicz
  • Greg Landgren
  • Advisor Prasad Shastry

2
Outline
  • Overview
  • Goals
  • Tasks for Semester
  • Antenna
  • LNA Network
  • Fabrication
  • Tentative Schedule

3
What is SDARS?
  • This project involves designs, simulations,
    fabrication, and testing of a patch antenna and
    low-noise amplifier (LNA) to receive SDARS
    signals by means of SIRIUS receiver.
  • The inclusion of the entire active antenna
    (passive antenna impedance matching network
    LNA) will be designed to minimize physical size,
    while producing the best quality of signal.

4
System Block Diagram
Incoming Circularly Polarized Satellite Signal
(-105 to -95)dbm
5
Antenna Goals
  • Receive signals in the frequency band from 2.32
    GHz to 2.3325 GHz (BW of 12.5 MHz)
  • Left Hand Circular Polarization (LHCP)
  • Match in impedance to LNA network
  • (50 Ohms)
  • Probe Feed Placement will determine
    polarization and impedance match

6
LNA Goals
  • Noise factor shall be lt 1dB
  • NF F1 (F2 -1)/G1 (F3-1)/(G1G2 ) . . .
  • Total gain shall be -gt 4050 dB
  • Gtotal G1 G2 . . .

7
Tasks for Semester
  • Complete EM simulations with Momentum and
    optimize antenna design (Feb)
  • Test LNA evaluation boards with NA (Feb)
  • Design Impedance Matching for the LNA network
    (Feb)
  • Simulate entire active antenna in Agilent ADS
    (March)
  • Design Bias Circuitry for the LNAs (March)
  • Outsource Fabrication of Substrates (April)
  • Test Fabricated Antenna and LNA substrates (May)
  • Test complete systems active antenna board with
    Sirius Receiver (May)

8
3D Passive Antenna Model
9
Antenna Dimension Equations
  • (LW for square patch)
  • Initial length L c/(2fo er(1/2))
  • eeff (er1)/2 (er-1)/2112(h/L))(-1/2)
  • Fringe factor, ?L0.412 h (e eff 0.3)( W/h
    0.264) / ( (e eff - 0.258)(W/h 0.8))
  • New length L c/(2fo eeff(1/2)) - 2?L
  • repeat iterative process
    3.69cm x 3.69 cm

1 Balanis, Constantine A, Microstrip
Antennas, in Antenna Theory, 3rd ed. John Wiley
and Sons, Inc., 2005, pp. 811-882
10
PCAAD (design for 2.326ghz)
11
EM Simulation / Optimization
Agilent ADS - Patch Antenna S11
12
Patch Antenna Top View
Probe location x 2.6372 cm x y 2.6372 cm
(0.509 cm from center)
13
EM Simulation / Optimization
Agilent ADS - Patch Antenna S11
Impedance Zo(0.978-j0.001)
14
Antenna Dissected Side View
Probe Feed copper wire diameter 0.15 cm Probe
hole 0.165 cm
15
Antenna - Bottom View (LNA network)
16
LNA schematics
17
LNA experimental Gain
  • Powered by Sirius Receiver

18
S11 (return loss)
Entire System (Passive Antenna LNA)
19
Fabrication
  • Microcircuits, Inc.
  • Using Gerber files for both antenna and LNA
    layouts
  • CAMtek, Inc.
  • Soldering

20
Tentative Schedule
  • Finalize Antenna and LNA layout and send Gerber
    file to Microcircuits (Mar.9)
  • Test fabricated Antenna performance (March)
  • Send fabricated LNA substrate to CAMtek for
    soldering (March)
  • Assembly of completed boards, solder probe,
    mount to a Plexiglas or plastic encasing (April)

21
Conclusion
  • Finalized patch antenna dimensions and probe
    location
  • LNA network gain will not meet proposed goal, but
    will suffice for our purposes
  • Simulations show respectable return loss at
    desired bandwidth
  • Fabrication and Assembly to be completed

22
References
  • 1 Zomchek, Greg and Zeliasz, Erik. SDARS
    Front-End Receiver Senior Capstone Project
  • Report. Bradley University, Spring, 2001.
  • 2 Lockwood, Kevin. SDARS Front-End Receiver
    Senior Capstone Project Report.
  • Bradley University, Spring, 2011.
  • 3 Balanis, Constantine A., Microstrip
    Antennas, in Antenna Theory, 3rd ed. John Wiley
  • and Sons, Inc., 2005, pp.811-882
  • 4 Pozar, David M. and Schaubert, Daniel H. A
    Review of Bandwidth Enhancement
  • Techniques for Microstrip Antennas, in
    Microstrip Antennas the analysis and design of
  • microstrip antennas and arrays Institute of
    Electrical and Electronics Engineers, Inc., 1995,
  • pp.157-165
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