The RBL-5500.000-2012-W-001 from Raltron is a Balun with Frequency 3 to 8 GHz, Amplitude Balance ±2.5 dB, Phase Balance ±20 Degree, Phase_Shift 180 Degree, Insertion Loss 1.5 to 1.7 dB. Tags: Surface Mount, Unbalanced to Balanced. More details for RBL-5500.000-2012-W-001 can be seen below.