The PDM-21-3.8G SQ from Crane Aerospace & Electronics is a Power Divider with Frequency 3.4 to 4.2 GHz, Insertion Loss 0.4 dB, Isolation 20 dB, Input Power 10 W, Amplitude Balance ±0.3 dB. Tags: Module with Connectors, Stripline Power Divider. More details for PDM-21-3.8G SQ can be seen below.