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

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Presentation on theme: "Antenna Test Range CSU ECE Senior Design Project 2009 Professor Branislav Notaros Ryan Koenig, Aaron Kim, Michael Turner."— Presentation transcript:

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

2 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 2

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

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 4

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

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

7 Example System ANTENNA TEST RANGE 2009 7

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

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

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

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

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

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

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

15 Antenna Test Software - Code ANTENNA TEST RANGE 2009 15 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

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 16

17 Antenna Test Software - Code ANTENNA TEST RANGE 2009 17 “Run Measurement” Sub-VI 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 ANTENNA TEST RANGE 2009 18 “Array to Listbox” state

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 19

20 ATRCamApp Program Flow ANTENNA TEST RANGE 2009 20

21 XY Planar Scanner with Polarization ANTENNA TEST RANGE 2009 21

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) Structural Material: Machined Delrin low friction coefficient excellent dimensional stability excellent insulator ANTENNA TEST RANGE 2009 22

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

24 PWM & Microstepping Quarter Increment Microstepping Atmel ATMega168 Microprocessor Allegro A3979 Microstepper Pulse Width Modulation (PWM) USB to FT232RMotor ANTENNA TEST RANGE 2009 24

25 Budget Estimates ANTENNA TEST RANGE 2009 25

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 26

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

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