The BD4859N50100AHF from TTM Technologies is a Balun with Frequency 4.8 to 5.9 GHz, Amplitude Balance ±0.9 to 1.5 dB, Phase Balance 3 to 8 Degree, Insertion Loss 0.6 to 0.8 dB, Power 1 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD4859N50100AHF can be seen below.