The CFM2021X215 from Cernex Inc is a Frequency Multiplier with Input Frequency 20.5 to 21.5 GHz, Output Frequency 41 to 43 GHz, Output Power 15 dBm, VSWR 2.00:1, Frequnecy 20.5 to 21.5 GHz. Tags: Module with Connectors, Active, Passive. More details for CFM2021X215 can be seen below.