1. Low Cost, Compact Microwave Reflectometer for Non-Destructive Testing
Matthew Rangen and Keith Bruno
March 3, 2005
Bradley University
Department of Electrical and Computer Engineering

2. Overview Objective Background Block Diagram Tasks & Schedule
Current Results
MATLAB
Network Analyzer
Future Work

3. Objective
The objective of the project is to determine the reflection coefficient of an unknown load by the use of a six-port network analyzer integrated with a workstation.

4. Background
The reflection coefficient can be found by knowing a reference signal and sampling selected power outputs in a micro-strip circuit. With these known quantities and using a specific algorithm, the reflection coefficient can be calculated.

5. Detailed Block Diagram
Explain Inputs for RF block and software block

6. Tasks & Schedule (previous)
Final Exams
6 to11
May
Final Report due, Presentation & Final Exams
29 to 5
April/May
Final Report & Presentation Preparation
22 to 28
Verify Operation
15 to 21
8 to 14
System Integration & Testing
1 to 7
April
25 to 31
Test 6-Port
18 to 24
Spring Break
11 to 17
Test Programming Code
4 to 10
March
Fabricate 6-Port
Integrate MATLAB & A/D
25 to 3
Feb/March
Design & Simulate Interface
Test Equations
Implement Equations in MATLAB
Design & Simulate 6-Port
February
Purchase: Detectors & USB A/D
Simulate & Test 90º Hybrid
28 to 3
Jan/Feb
Design 90º Hybrid
Develop Calibration
& Measuring Equations
21 to 27
January
Keith Bruno
Matthew Rangen

7. MATLAB Work
Overall
Calibration
Flowchart
Calibration Mode

8. Calibration Work
Calibration
Flow
Equations
Measure Mode

9. Calibration Work
Calibration
Flow
Equations
Part 2
Measure Mode

10. Calibration Work
Calibration
Flow
Equations
Part 3
Measure Mode

11. MATLAB Work
Measure
Flowchart
Measure Mode

12. Measurement Work
Measurement
Equations
Measure Mode

13. 6-Port Network Analyzer

14. } 90° Hybrid Input Port Output Port 90° phase-shift difference
Isolated Port
Output Port

15. 90° Hybrid

16. 90° Hybrid Results

17. 90° Hybrid Results

18. Lange Coupler
Isolated Port
Through Port
Input Port
Coupled Port

19. Lange Coupler

20. Lange Coupler Results

21. Future Work MATLAB Work
Finish MATLAB code and test with arbitrary values
Determine the procedure of operating the oscilloscope through remote access
Implement oscilloscope readings into MATLAB code
Stream-line code

22. Future Work Six-Port Network Analyzer
Determine power measurements in ADS at the four output ports
Design loads used for calibration
Simulate six-port network in ADS
Fabricate network analyzer

23. Tasks & Schedule (current)

24. Overview Objective Background Block Diagram Tasks & Schedule
Current Results
MATLAB
Network Analyzer
Future Work

25. Questions? Check us out at:
cegt201.bradley.edu/projects/proj2005/sixpna