The RFWA284B9CFA-L from RF-Lambda is a Waveguide to Coax Adapter with Frequency 2.60 to 3.95 GHz, Power 50 W, Insertion Loss 0.2 dB, Operating Temperature -45 to 85 Degree C, Storage Temperature -55 to 125 Degree C. More details for RFWA284B9CFA-L can be seen below.