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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 Tentative Schedule. What is SDARS?.

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Sdars receiver front end design review

SDARS Receiver Front-End(Design Review)

Albert Kulicz

Greg Landgren

Advisor: Prasad Shastry


Outline
Outline

  • Overview

  • Goals

  • Tasks for Semester

  • Antenna

  • LNA Network

  • Fabrication

  • Tentative Schedule


What is sdars
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.


System block diagram
System Block Diagram

Incoming Circularly Polarized Satellite Signal (-105 to -95)dbm


Antenna goals
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


Lna goals
LNA Goals

Noise factor shall be <= 1dB

NF = F1 + (F2 -1)/G1 + (F3-1)/(G1*G2)+ . . .

Total gain shall be -> 40~50 dB

Gtotal = G1+ G2 + . . .


Tasks for semester
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)



Antenna dimension equations
Antenna Dimension Equations

[1] Balanis, Constantine A, “Microstrip Antennas,” in Antenna Theory, 3rd ed. John Wiley and Sons, Inc., 2005, pp. 811-882

(L=W for square patch)

Initial length L = c/(2fo* εr^(1/2))

εeff= (εr+1)/2 + (εr-1)/2*[1+12(h/L))^(-1/2)

Fringe factor, ΔL=0.412 h (ε eff + 0.3)( W/h + 0.264) / ( (ε eff - 0.258)(W/h + 0.8))

New length L = c/(2fo* εeff^(1/2)) - 2ΔL

repeat iterative process 3.69cm x 3.69 cm



Em simulation optimization
EM Simulation / Optimization

Agilent ADS - Patch Antenna S11


Patch antenna top view
Patch Antenna – Top View

Probe location: [x] 2.6372 cm x [y] 2.6372 cm (0.509 cm from center)


Em simulation optimization1
EM Simulation / Optimization

Agilent ADS - Patch Antenna S11

Impedance = Zo*(0.978-j0.001)


Antenna dissected side view
Antenna – Dissected Side View

Probe Feed:

copper wire diameter – 0.15 cm

Probe hole – 0.165 cm




Lna experimental gain
LNA experimental Gain

Powered by Sirius Receiver


S11 return loss
S11 (return loss)

Entire System (Passive Antenna & LNA)


Fabrication
Fabrication

  • Microcircuits, Inc.

    • Using Gerber files for both antenna and LNA layouts

  • CAMtek, Inc.

    • Soldering


Tentative schedule
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)


Conclusion
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


References
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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