The SDC360440-20 from Synergy Microwave Corporation is a Bi-Directional Coupler with Frequency 3.6 to 4.4 GHz, Coupling 19 dB, Coupling Variation ±0.25 to 0.6 dB (Flatness), Power 10 W, Insertion Loss 0.8 to 1.2 dB. Tags: Surface Mount. More details for SDC360440-20 can be seen below.