Problem with Multiline TRL Code [TRLML.m]

[ImtiazShuvo]

I am confused about "fb" in function. It need to compare for choosing line1 and line2. Can you please help me to understand this.

[CornellvanNiekerk]

The fb parameter is the frequency where the calibration starts using a different line standard. TRL calibration uses line standards with a 20 degree to 160 degree phase, which gives you a 1:8 frequency range. To calibrate over a wider frequency range, you need to use multiple line standards.

Note that this code is not an implementation of the multi-line calibration from NIST.