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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
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Overview Objective Background Block Diagram Tasks & Schedule
Current Results MATLAB Network Analyzer Future Work
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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.
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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.
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Detailed Block Diagram
Explain Inputs for RF block and software block
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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
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MATLAB Work Overall Calibration Flowchart Calibration Mode
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Calibration Work Calibration Flow Equations Measure Mode
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Calibration Work Calibration Flow Equations Part 2 Measure Mode
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Calibration Work Calibration Flow Equations Part 3 Measure Mode
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MATLAB Work Measure Flowchart Measure Mode
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Measurement Work Measurement Equations Measure Mode
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6-Port Network Analyzer
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} 90° Hybrid Input Port Output Port 90° phase-shift difference
Isolated Port Output Port
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90° Hybrid
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90° Hybrid Results
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90° Hybrid Results
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Lange Coupler Isolated Port Through Port Input Port Coupled Port
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Lange Coupler
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Lange Coupler Results
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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
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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
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Tasks & Schedule (current)
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Overview Objective Background Block Diagram Tasks & Schedule
Current Results MATLAB Network Analyzer Future Work
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Questions? Check us out at:
cegt201.bradley.edu/projects/proj2005/sixpna
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