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 Tentative Schedule. What is SDARS?.

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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

  • Tentative Schedule


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

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


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

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

  • 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)


3D Passive Antenna Model


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


PCAAD (design for 2.326ghz)


EM Simulation / Optimization

Agilent ADS - Patch Antenna S11


Patch Antenna – Top View

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


EM Simulation / Optimization

Agilent ADS - Patch Antenna S11

Impedance = Zo*(0.978-j0.001)


Antenna – Dissected Side View

Probe Feed:

copper wire diameter – 0.15 cm

Probe hole – 0.165 cm


Antenna - Bottom View (LNA network)


LNA schematics


LNA experimental Gain

Powered by Sirius Receiver


S11 (return loss)

Entire System (Passive Antenna & LNA)


Fabrication

  • Microcircuits, Inc.

    • Using Gerber files for both antenna and LNA layouts

  • CAMtek, Inc.

    • Soldering


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

  • 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

[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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