The R&S®ZC75 from Rohde & Schwarz is a Vector Network Analyzer Extender with Extended Frequency 50 to 75 GHz, Input Frequency 12.5 to 18.750 GHz, LO Frequency 8.287 to 12.454 GHz, Output Power 10 to 12 dBm, Input Power 20 dBm(Damage Level). More details for R&S®ZC75 can be seen below.