The X4C20K1-04S from TTM Technologies is a Directional Coupler with Frequency 1.7 to 2.3 GHz, Coupling 4.15 dB, Coupling Variation ±0.35 dB, Average Power 10 W, Insertion Loss 0.3 dB. Tags: Surface Mount. More details for X4C20K1-04S can be seen below.