The RBL-2012-E0-TR from Raltron is a Balun with Frequency 1.5 to 3.1 GHz, Amplitude Balance ±2 dB, Phase Balance ±10 Degree, Phase_Shift 180 Degree, Insertion Loss 1 dB. Tags: Surface Mount, Unbalanced to Balanced. More details for RBL-2012-E0-TR can be seen below.