The X4C30K1-04S from TTM Technologies is a Directional Coupler with Frequency 2.5 to 3.8 GHz, Coupling 3.8 dB, Coupling Variation ±0.30 dB, Average Power 10 W, Insertion Loss 0.2 dB. Tags: Surface Mount. More details for X4C30K1-04S can be seen below.