The BD2239N5050AHF from TTM Technologies is a Balun with Frequency 2.2 to 4.2 GHz, Amplitude Balance ±0.5 to 1.4 dB, Phase Balance 3.4 to 9 Degrees, Insertion Loss 0.7 to 1.8 dB, Power 0.75 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD2239N5050AHF can be seen below.