The QSDBC-11900-18000 from Qualwave is a Waveguide Coupler with Frequency 11.9 to 18 GHz, Coupling 10 to 50 dB, Directivity 25 to 30 dB, Power 180000 W. Tags: Broadwall Coupler, Directional Coupler. More details for QSDBC-11900-18000 can be seen below.