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ONGOING DEVELOPMENT OF A MODERN RADIO-FREQUENCY (RF) AND MICROWAVE
ENGINEERING LABORATORY
B. D. Braaten*D. A. RogersR. M. Nelson
North Dakota State University: Applied Electromagnetics Lab
Topics
Introduction and History Experiments in the Early Years Metallic Waveguide Experiments Freire-Diniz Model Pozar’s Model Budget-Priced Instruments CAD in a Microwave Engineering Lab A Modern Microwave Lab Conclusion
North Dakota State University: Applied Electromagnetics Lab
Introduction and History Upgrade of the RF and microwave laboratory at
NDSU. This lab has a long history - began in 1958 Originally, the experiments involved the slotted line,
General Radio equipment, the slotted waveguide and HP equipment.
The new lab updated this equipment and introduced software simulation.
North Dakota State University: Applied Electromagnetics Lab
Early Experiments Labs in the 70’s included the following experiments
Artificial transmission lines. Time delay reflectometers with artificial and real
transmission lines. Modeling capacitors with conductive paper. Stub tuning
These experiments demonstrated phase velocity, line attenuation, char. impedance, reflection coef., material properties and tuning to the student
North Dakota State University: Applied Electromagnetics Lab
Metallic Waveguides Labs in the 80’s started to include
waveguide experiments in the X-band (~7 GHz -11 GHz) Slotted lines Slotted waveguides
These experiments demonstrated different waveguide configurations (tees, dielectric filled waveguides, isolators) standing waves, attenuation, power and complex impedance values to the student
North Dakota State University: Applied Electromagnetics Lab
Freire-Diniz Model In the 1973, Dr. Freire and Dr. Diniz published a textbook
in Portuguese on EM laboratory experiments. Based on American and European Universities. Required modest investments from departments. These experiments included
Various measurements of transmission line parameters
Impedance matching techniques Various waveguide measurements Antenna pattern measurements
North Dakota State University: Applied Electromagnetics LabWeinschel Associates
Pozar’s Model Today, Dr. Pozar’s Microwave Engineering Laboratory
stands as a model for other labs. Associated with a second course on electromagnetics. These experiments included
The slotted line The vector network analyzer Active devices Impedance matching and tuning Cavity resonators Directional couplers
North Dakota State University: Applied Electromagnetics LabAgilent Technologies
Budget-Priced Instruments MJF Enterprises antenna analyzer ($500) PC-based RF spectrum and network analyzer
($1000)
North Dakota State University: Applied Electromagnetics Labwww.signalhoud.com www.mjfenterprises.com
CAD in a Microwave Engineering Lab Advanced Design System (ADS) High Frequency Structure Simulator (HFSS) IE3D CST
North Dakota State University: Applied Electromagnetics Lab
www.zeland.com
A Modern LabBefore:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabWork in progress:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabMULTIPURPOSE SPACE!
North Dakota State University: Applied Electromagnetics Lab
A Modern LabCross-talk experiment:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabDiscrete components:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabNetwork analyzer:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabSpectrum analyzer:
North Dakota State University: Applied Electromagnetics Lab
A Modern LabOther spaces:
North Dakota State University: Applied Electromagnetics Lab
Other LabsAnechoic chamber:
North Dakota State University: Applied Electromagnetics Lab
Conclusion
North Dakota State University: Applied Electromagnetics Lab
Early Years Metallic Waveguide Experiments Freire-Diniz and Pozar’s Model Budget-Priced Instruments CAD in a Lab A Modern Microwave Lab
Questions
Thank you for listening!
North Dakota State University: Applied Electromagnetics Lab
