The D4-42FS from Microlab is a Power Divider with Frequency 1.1 to 1.65 GHz, Insertion Loss 1.4 dB, Isolation 22 dB, Input Power 0.25W, Amplitude Balance 0.4 dB. Tags: Module with Connectors, Wilkinson Power Divider. More details for D4-42FS can be seen below.