The CFM0404X420 from Cernex Inc is a Frequency Multiplier with Input Frequency 4.37 to 4.88 GHz, Output Frequency 17.48 to 19.52 GHz, Input Power 10 dBm, Output Power 20 dBm, Harmonics 20 dBc. Tags: Module with Connectors, Active, Passive. More details for CFM0404X420 can be seen below.