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Cost-Effective Antenna Positioning System for RF and Microwave Measurements

Learn about the development of a cost-effective antenna measurement system and its components at North Dakota State University's Applied Electromagnetics Lab. Explore the motivation behind the project, the topology of the system, measurement steps, and cost considerations, including initial results.

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Cost-Effective Antenna Positioning System for RF and Microwave Measurements

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  1. A COST-EFFECTIVE ANTENNA POSITIONING SYSTEM FOR MODERN RADIO-FREQUENCY (RF) AND MICROWAVE ANTENNA MEASUREMENTS J. T. Anderson M.R. Weisz J. A. Meyer D. L. Hanson B. D. Braaten* D. A. Rogers North Dakota State University: Applied Electromagnetics Lab

  2. Topics • Introduction and Background • Motivation • Topology of the Measurement System • Measurement Steps and Cost North Dakota State University: Applied Electromagnetics Lab

  3. Introduction and Background • Started with an upgrade to the microwave laboratory at NDSU. • An Agilent E5071C 8.5 GHz ENA Network Analyzer was purchased. • This required the development of an antenna measurement system (AMS). • A design team was assembled to develop the AMS system. • The AMS is about 10% the cost of commercially available systems. North Dakota State University: Applied Electromagnetics Lab

  4. Motivation • Education • Senior design project – controls and wireless • Antenna course • Microwave engineering course • Computational electromagnetics • Research – Radiation pattern • Wireless communications • Printed antennas and arrays North Dakota State University: Applied Electromagnetics Lab

  5. Topology Three main components Antenna positioner Network analyzer Computer North Dakota State University: Applied Electromagnetics Lab

  6. Topology Antenna Positioner : Hardware (control belt) (servo and collar) North Dakota State University: Applied Electromagnetics Lab

  7. Topology Network Analyzer : Hardware (anechoic chamber) North Dakota State University: Applied Electromagnetics Lab

  8. Topology Computer : Hardware (receiver) (transmitter) (IR boards) Data from PC to positioner North Dakota State University: Applied Electromagnetics Lab

  9. Topology Computer : Software North Dakota State University: Applied Electromagnetics Lab

  10. Comments Some initial results: North Dakota State University: Applied Electromagnetics Lab

  11. Measurements and Cost • Budget : $750 • Measurement steps: • Power-up and record values from analyzer • Rotate positioner • Wait and record value from analyzer • Rotate positioner • Wait and record value from analyzer…etc. • When finished, display results North Dakota State University: Applied Electromagnetics Lab

  12. Questions Thank you for listening! North Dakota State University: Applied Electromagnetics Lab

  13. Appendix Transmitter schematic North Dakota State University: Applied Electromagnetics Lab

  14. Appendix Receiver schematic North Dakota State University: Applied Electromagnetics Lab

  15. Appendix Transmitter circuit contains the following components: (2) LED indicators (7) 4.77µF capacitors (4) 1kΩ resistors (2) push button (1) MC33063A voltage regulator (1) MCP2120 IrDA driver (1) 10kΩ TrimPot (1) 100kΩ TrimPot (1) PIC18F242-I (2) 40MHz Crystals North Dakota State University: Applied Electromagnetics Lab

  16. Appendix Receiver circuit contains the following components: (2) LED indicators (14) 4.77µF capacitors (4) 1kΩ resistors (2) 10kΩ resistors (1) 100kΩ resistor (4) push button (1) MC33063A voltage regulator (1) MCP2120 IrDA driver (1) 10kΩ TrimPot (1) 100kΩ TrimPot (1) Pololu Micro-Controler SSC03A (1) MAX232A RS-232 driver (1) PIC18F242-I (2) 32.768kHz Crystals North Dakota State University: Applied Electromagnetics Lab

  17. Appendix IR board schematic Parts: (2) 1kΩ resistors (2) 4.7µF capacitors (2) TFDU4101 Vishay Infrared Transceivers (1) 4 pin header to connect to transmitter or receiver North Dakota State University: Applied Electromagnetics Lab

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