The 4315-2 from Narda-MITEQ is a Power Divider with Frequency 8 to 12.4 GHz, Insertion Loss 0.5 dB, Isolation 20 dB, Input Power 1 to 30 W, Amplitude Balance 0.2 dB. Tags: Module with Connectors, Reactive Power Divider, Octave Power Divider. More details for 4315-2 can be seen below.
