The BD2040J50100AHF from TTM Technologies is a Balun with Frequency 2 to 4 GHz, Amplitude Balance ±0.6 to 1.48 dB, Phase Balance 8.2 to 16.5 Degrees, Insertion Loss 0.8 to 1.3 dB, Power 1.2 to 2 W. Tags: Surface Mount, Balanced to Unbalanced. More details for BD2040J50100AHF can be seen below.