The BD2130J5050AHF from TTM Technologies is a Balun with Frequency 2.1 to 3 GHz, Amplitude Balance ±0.45 to 1 dB, Phase Balance 2 to 5 Degree, Insertion Loss 0.75 to 1.2 dB, Power 1.2 to 2 W. Tags: Surface Mount, Balanced to Unbalanced. More details for BD2130J5050AHF can be seen below.