#208: Visualizing RF Standing Waves on Transmission Lines
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange users point people to it when they want to see standing waves on a line, whether for antenna feedline questions, building a measurement setup, or understanding transmission line effects.
Recommended by 0 people across 0 different months, 2018 to 2022.
What it is
A 10-minute bench demonstration by Alan Wolke (w2aew) showing how RF standing waves form on a transmission line from the sum of the forward wave and the wave reflected by a mismatched termination. He uses an oscilloscope and an RF detector probe to show the waveforms and the voltage pattern along the line.
What people said
Cites I.Omar · 2018-04 · Electrical Engineering Stack Exchange · on “Transmission line voltage measurement(visualizing standing wave)”
I want to measure voltage across a T-line to visualize standing waves on the line. something like this video min 6:53 [this video] and this experiment Measuring Standing Waves on a Microstrip Transmission Line [LINK] I have purchased this VCO [LINK] to generate RF source signal.It's 5mW. I am using 12V 5A power supply [LINK] . This is my circuit (T-line is open as I want to meassure open, short, and, matched) [LINK] Then I used a voltage multiplier circuit to detect the RF signal(also tried half wave rectifier) and connected it's output to my analog voltameter with 0.5V, 0.25V, 100uA scale, but I didn't get any reading. I used 1n34a [LINK] diodes with ceramic 10nF caps. Questions: Why doesn't vol
Cites Hart22 · 2019-03 · Electrical Engineering Stack Exchange · on “Standing waves feedline length and dipole antenna feedline”
so I have a question regarding reflections/characteristic impedance and there relation with a quarter wave transformer and its feed line. Now I have found this video very useful for visualising what is happening with standing waves [this video] coupled with the the recommended wiki link from this video. [LINK] I have two questions which can be applied to the following picture [LINK] 1. For a quarter wave transformer it is (relatively) easy to calculate the length of the quarter wave transformer to allow for the voltage or current to be at their maximum or minimum, BUT what happens if the length of the feedline to this quarter wavelength transformer starts with the RF wave being not at a perfect d
Cites Jim Fischer · 2022-01 · Electrical Engineering Stack Exchange · on “Reference Potential in AC circuits”
If the frequency is very high and the wires are long enough, we need to consider transmission line effect. When working with high frequency signals, transmission line effects should be analyzed for any length of conductor, not only "long" lines. The potential at different points on the same wire on each side of the resistor will have different potentials V.... Isn't it a problem when we try to select the reference point with 0 V in that case? Don't forget that voltage is nothing more than the difference of two potentials, $$ V = P_2 - P_1 $$ where \$P_1\$ is the reference potential, and the reference potential can be any potential \$P_x\$ . And of course, each time you chose a different refe