Phun Physics Toy, for those with Rectangular Horn, Courtesy of ChatGPT

[Stephen Arbogast]

Waveguide modes can be simulated in Python using analytical equations for hollow metallic structures.

I copied and pasted the Python  from ChatGPT  into a Jupyter Notebook, attached and  results.  Try  changing  m,n  in last line in the Python.....

[Stephen Arbogast]

If  you  don't want to deal with Jupyter Lab   here is  attached  python  code.   

You will need to load  numpy and matplotlib modules  into your  python  enviroment.....

pip install numpy matplotlib

I am running  on Ubuntu  26.04

[Stephen Arbogast]

And for circular wave guides...