The QSDBC-3500-8200 from Qualwave is a Waveguide Coupler with Frequency 3.5 to 8.2 GHz, Coupling 60 dB, Directivity 20 dB, Power 2000 W. Tags: Broadwall Coupler, Directional Coupler, Double Ridged Coupler. More details for QSDBC-3500-8200 can be seen below.