The QDDBC-11900-18000 from Qualwave is a Waveguide Coupler with Frequency 11.9 to 18 GHz, Coupling 40 dB, Directivity 25 to 30 dB, Insertion Loss 0.2 dB, Power 180000 W. Tags: Dual Directional Coupler, Broadwall Coupler. More details for QDDBC-11900-18000 can be seen below.