The 5400BL14B100 from Johanson Technology is a Balun with Frequency 4.9 to 5.875 GHz, Amplitude Balance 1.5 dB, Phase Balance 10 Degree, Insertion Loss 1.0 dB, Power 0.5 W. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 5400BL14B100 can be seen below.