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SDARS Receiver Front-End (Design Review)

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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  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 <= 1dB NF = F1 + (F2 -1)/G1 + (F3-1)/(G1*G2)+ . . . Total gain shall be -> 40~50 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 [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

  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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