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Antenna Test Range

Ryan Koenig, Aaron Kim, Michael Turner. Antenna Test Range. CSU ECE Senior Design Project 2009 Professor Branislav Notaros. Presentation Topics. Aaron Kim Introduction System Overview Michael Turner Antenna Positioning System Antenna Test Software Ryan Koenig ATRCamApp

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Antenna Test Range

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  1. Ryan Koenig, Aaron Kim, Michael Turner Antenna Test Range CSU ECE Senior Design Project 2009 Professor Branislav Notaros

  2. Presentation Topics • Aaron Kim • Introduction • System Overview • Michael Turner • Antenna Positioning System • Antenna Test Software • Ryan Koenig • ATRCamApp • Planar/Source Scanner • Budget • Next Semester Plans ANTENNA TEST RANGE 2009

  3. Why do we need to measure antennas? • Numerical analysis are complex • Validation of theoretical models • Environmental effects ANTENNA TEST RANGE 2009

  4. Antenna Test Ranges • Reflection Ranges • Free Space Ranges • Elevated Ranges • Slant Ranges • Anechoic Chambers • Used in this project • Compact Ranges ANTENNA TEST RANGE 2009

  5. Field Methods • Near Field • λ/2π < r < 2D2/λ • Attenuation • Polarization • Far Field • r < 2D2/λ • Attenuation ANTENNA TEST RANGE 2009

  6. Near Field/Far Field Techniques • Three techniques • Planar Scanner • Spherical Scanner • Cylindrical Scanner • Mathematical simplicity ANTENNA TEST RANGE 2009

  7. Example System ANTENNA TEST RANGE 2009

  8. Antenna Positioning System • Multi-axis antenna positioning system used for the AUT (antenna under test) • Designed and analyzed in SolidWorksand Cosmos FEA. • The movement is accomplished via precision stepper motors, controlled through a custom PCB previously created ANTENNA TEST RANGE 2009

  9. Antenna Test Software ANTENNA TEST RANGE 2009 Home screen of the test software

  10. Antenna Test Software ANTENNA TEST RANGE 2009 This screen allows the user to configure the motor sweep parameters

  11. Antenna Test Software ANTENNA TEST RANGE 2009 This screen allows the user to configure the VNA settings

  12. Antenna Test Software ANTENNA TEST RANGE 2009 This screen shows the scan progress and the approximate scan time

  13. Antenna Test Software ANTENNA TEST RANGE 2009 This screen displays the scan data and parameters

  14. Antenna Test Software - Code Program Flowchart Programming done with LabView 8.6 ANTENNA TEST RANGE 2009

  15. Antenna Test Software - Code • Queue driven state machine with events • States • Initialize • Open Error Log • About • Home • Motor Sweep • VNA Setup • Run Measurement • Array To Listbox • Update Graph • Export Data • Default • Clean Up • Exit ANTENNA TEST RANGE 2009

  16. Antenna Test Software - Code • Events • Timeout • “Exit”: Value Change • “Cancel”: Value Change • “Configure Measurement”: Value Change • “Start”: Value Change • “Next”: Value Change • “Export Data”: Value Change • “Multicolumn Listbox”: Double Click ANTENNA TEST RANGE 2009

  17. Antenna Test Software - Code “Run Measurement” Sub-VI ANTENNA TEST RANGE 2009 • This VI is located within the “Run Measurement” state of the main code • A state machine of its own, its responsible for performing the measurement • collecting the data from the VNA

  18. Antenna Test Software - Code “Array to Listbox” state ANTENNA TEST RANGE 2009

  19. Multiple Camera Capture Demand: Single Application that displays image capture from two identical webcams. Solution: ATRCamApp • Programmed in Microsoft Visual Studio • Written C++ .Net • Implements Microsoft DirectShow (API) • Tutorial and Example given at http://www.codeproject.com/KB/audio-video/Cpp_DShowNET_FrameCap.aspx ANTENNA TEST RANGE 2009

  20. ATRCamApp Program Flow ANTENNA TEST RANGE 2009

  21. XY Planar Scanner with Polarization ANTENNA TEST RANGE 2009

  22. XY Planar Scanner with Polarization • Three movements: • Horizontal: Belt drive • Vertical: Screw drive shaft powered by stepper motor • Polar: Linear actuator to arm and lever. (smaller) ANTENNA TEST RANGE 2009 • Structural Material: Machined Delrin • low friction coefficient • excellent dimensional stability • excellent insulator

  23. Bipolar Stepper Motor 1a  and 2a  2b and 2a  Clockwise Pulse Width Modulation ANTENNA TEST RANGE 2009

  24. PWM & Microstepping USB to FT232R Motor Atmel ATMega168 Microprocessor Allegro A3979 Microstepper ANTENNA TEST RANGE 2009 Pulse Width Modulation (PWM) Quarter Increment Microstepping

  25. Budget Estimates ANTENNA TEST RANGE 2009

  26. What’s Next • CAD Design and testing of the Planer Scanner • Modify LabView Application for Planar Scanner • Write Planar Scanner Microprocessor Code • Manufacture Planar Scanner and remaining Spherical Positioner parts • Create Cylindrical Scanner Concept ANTENNA TEST RANGE 2009

  27. Thank you for your time, any Questions? ANTENNA TEST RANGE 2009

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