The ATX21-420 from Wright Technologies is a Frequency Multiplier with Input Frequency 4.62 to 5.13 GHz, Output Frequency 18.48 to 20.52 GHz, Input Power 10 dBm, Output Power 20 dBm (Sat), Harmonics -20 dBc. Tags: Module with Connectors. More details for ATX21-420 can be seen below.