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How would you test VSWR from DC to 18GHZ when most network analyzers bottom out in the MHz?

Question asked by rwith121 on Oct 23, 2020
Latest reply on Nov 16, 2020 by drkirkby

I have an Agilent 8720ES that tests from 50MHz to 18GHz but my customer requires VSWR and Insertion Loss from DC to 18GHz.  I looked for rental equipment to do the testing, but I'm getting quotes for equipment that has tests 1MHz to 20GHz.  So how do I test DC to 18GHz on modern network analyzers?