The RFXF4513 from MiniRF is a Balun with Frequency 5 MHz to 1 GHz, Amplitude Balance ± 0.3 to 0.5 dB, Phase Balance 3 to 5 Degree, Insertion Loss Less than 1.5 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for RFXF4513 can be seen below.