https://www.electronicdesign.com/news/products/article/21766991/network-analyzers-feature-three-channels-and-internal-vswr
Claiming to provide enhanced functionality and speed compared to the company's previous generation of network analyzers, the R376XG series from Advantest...
network analyzerselectronic designfeaturethreechannels
https://www.mathworks.com/help/antenna/ref/cavity.vswr.html
This MATLAB function calculates and plots the VSWR of an antenna or an array element, over specified frequency range, and a reference impedance of z0 ohms.
standing wave ratiovswrcalculateplotvoltage