The 4428C-2 from Narda-MITEQ is a Power Divider with Frequency 10 to 45 GHz, Insertion Loss 0.6 to 1.9 dB, Isolation 13 to 20 dB, Input Power 1 to 20 W, Amplitude Balance 0.3 to 0.5 dB. Tags: Module with Connectors, Reactive Power Divider, Multi-Octave Power Divider. More details for 4428C-2 can be seen below.
