The BD4859N50150AHF from Anaren Inc is a Balun with Frequency 4.8 to 5.9 GHz, Amplitude Balance ± 1.4 dB, Phase Balance 10 Degree, Insertion Loss 0.6 dB, Power 1 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD4859N50150AHF can be seen below.