The X4C20K1-20S from TTM Technologies is a Directional Coupler with Frequency 1.4 to 2.7 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.2 to ±0.5 dB, Directivity 20 dB. Tags: Surface Mount. More details for X4C20K1-20S can be seen below.