The STO-05203-U6 from ERAVANT is a Vector Network Analyzer Extender with Extended Frequency 140 to 220 GHz, Input Frequency 11.66 to 18.34 GHz, LO Frequency 11.66 to 18.34 GHz, Input Power 0 to 6 dBm, Dynamic Range 100 dB. More details for STO-05203-U6 can be seen below.