The BL-28S from MCLI is a 90 Degree Hybrid Coupler with Frequency 800 MHz to 3 GHz, Average Power 20 W, Insertion Loss 0.5 to 1 Db, Isolation 13 to 18 dB, Amplitude Balance ±0.7 to 1.5 dB. Tags: Surface Mount. More details for BL-28S can be seen below.