The BC-100A-20B from UMCC is a Bi-Directional Coupler with Frequency 20 MHz to 1 GHz, Coupling 20 dB, Coupling Variation ± 1 dB, Average Power 2 W, Insertion Loss 1 to 1.6 dB. Tags: Module with Connectors. More details for BC-100A-20B can be seen below.