The BD3150L50100AHF from TTM Technologies is a Balun with Frequency 3.1 to 5 GHz, Amplitude Balance ±0.3 to 0.9 dB, Phase Balance 3 to 9 Degree, Insertion Loss 0.7 to 1.1 dB, Power 2 W. Tags: Surface Mount, Balanced to Unbalanced. More details for BD3150L50100AHF can be seen below.