2023 BFY4 Abstract Detail Page
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| Abstract Title: |
W02: Laboratory Investigation of Distributed Electronic Circuits: Coaxial Transmission Lines |
| Abstract: |
Laboratory investigation of the phenomena and physics of signals propagating in coaxial transmission lines is a useful and relatively simple pathway for introducing intermediate level physics students, students who to that point in the curriculum may have largely considered and worked with only lumped electronic circuit models and systems, to the broader phenomena of distributed electronic/electromagnetic systems. In this workshop, participants will have the opportunity to work through a short laboratory exercise that we apply in that context. The response of coaxial transmission lines to signal pulses is measured and related to the physics governing their behavior. Using a function generator and a high pass RC filter, electronic pulses are applied to one terminal of a coaxial transmission line for which the other terminal can be subject to different electronic conditions. The length of the transmission line is sufficient so that multiple reflections of the pulse from the terminals can be resolved on an oscilloscope, and this condition places the behavior of the system in the realm of distributed electronic circuits. The primary activity for students is developing an experimental method to accurately measure the effective impedance of the coaxial transmission line by understanding and then exploiting the relationship between signal amplitudes measured at both terminals and the impedance properties of the components of the system (i.e., not simply using the impedance matching condition). These measurements can be compared to results from electromagnetic theory and component specs. Beyond this primary activity, there are additional experimental activities that can be performed with the apparatus associated with electromagnetic signal propagation and component impedance. |
| Abstract Type: |
Workshop
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Author/Organizer Information |
| Primary Contact: |
Michael Braunstein
Central Washington University
Ellensburg, WA 98926
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Workshop Documents |
| Workshop Doc 1: |
Download the Workshop Doc 1
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| Workshop Doc 2: |
Download the Workshop Doc 2
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