The X4C20J1-20G from TTM Technologies is a Directional Coupler with Frequency 1.4 to 2.89 GHz, Coupling 21 to 21.5 dB, Coupling Variation ±1.5 dB, Frequency Sensitivity ±0.3 to ±1.5 dB, Directivity 18 dB. Tags: Surface Mount. More details for X4C20J1-20G can be seen below.