The SYDC-18-23+ from Mini Circuits is a Bi-Directional Coupler with Frequency 10 MHz to 2 GHz, Coupling 17.8 dB, Average Power 1 to 2 W, Power 1 to 2 W, Insertion Loss 0.6 to 1.5 dB. Tags: Surface Mount. More details for SYDC-18-23+ can be seen below.