The QDDLC-2600-3950 from Qualwave is a Waveguide Coupler with Frequency 2.6 to 3.95 GHz, Coupling 40 to 50 dB, Directivity 20 to 30 dB, Insertion Loss 0.1 dB, Power 3500000 W. Tags: Dual Directional Coupler, Loop Coupler. More details for QDDLC-2600-3950 can be seen below.