The ERZ-HPA-4000-4500-28-E from ERZIA is a RF Amplifier with Frequency 40 to 45 GHz, Gain 23 to 25 dB, Output Power 27 to 29 dBm, Output Power 0.5 to 0.79 W, P1dB 27 to 29 dBm. Tags: Power Amplifier. More details for ERZ-HPA-4000-4500-28-E can be seen below.