The BDCA-16-30+ from Mini Circuits is a Bi-Directional Coupler with Frequency 1.8 to 4.2 GHz, Coupling 14.37 to 16.30 dB, Average Power 18 to 27 W, Power 18 to 27 W, Insertion Loss 0.41 to 0.84 dB. Tags: Surface Mount. More details for BDCA-16-30+ can be seen below.