The QSDC-6000-18000-K35-40-D650S from Qualwave is a Waveguide Coupler with Frequency 6 to 18 GHz, Coupling 40 dB, Directivity 12 dB, Insertion Loss 0.3 dB, Power 350 W. Tags: Directional Coupler. More details for QSDC-6000-18000-K35-40-D650S can be seen below.