The BL2450K06031T from Frontier Electronics is a Balun with Frequency 2.4 to 2.5 GHz, Amplitude Balance ± 2 dB, Phase Balance 10 Degree, Insertion Loss 1.2 dB, Return Loss 9.5 dB. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for BL2450K06031T can be seen below.