I have been working to create a model of a coupler in FDTD but I am having trouble with the ports and S-Parameter sweep. The coupler is built using the setup script in the file.
The issue is that the S-Parameter results do not match expected results. The coupler is symmetric around the y axis, yet the S-Parameters do not reflect that. To my knowledge of S-Parameters, S24 should equal S42 in this case but it doesn’t.
Also the passivity and reciprocity throwing errors.
Any help is appreciated. I’d like to know what I’m doing wrong.
coupler.fsp (6.5 MB)
Some additional information:
The goal here is to practice creating a compact model to be used in Interconnect using aya_zaki’s method in his post titled “Steps of Creating a Compact model for a Taper Waveguide.” So far the method and scripting hasn’t been a problem, it’s just the S-Parameter results that is the issue.