The DC-18A721A2-1820 from ITS Electronics is a Low Noise Block with RF/Input Frequency 18.7 to 19.6 GHz / 19.5 to 20.4 GHz / 20.3 to 21.2 GHz, Output Frequency 1 to 1.9 GHz, Output Power 18 dBm, P1dB 18 dBm, IP3 22 dBm. More details for DC-18A721A2-1820 can be seen below.