The D408 from Clear Microwave, Inc is a Power Divider with Frequency DC to 8 GHz, Insertion Loss 0.8 to 1 dB, Input Power 2 W, Amplitude Balance 0.08 to 0.15 dB, Phase Balance 0.7 to 1.5 Degree. Tags: Module with Connectors, Through Hole, Resistive Power Divider. More details for D408 can be seen below.
