The SMC-071D350 from Scientific Microwave Corporation is a Waveguide Coupler with Frequency 3.50 to 8.20 GHz, Coupling 30 dB, 40 dB, 50 dB, 60 dB, Directivity 14 dB. Tags: Double Ridged Coupler, Loop Coupler. More details for SMC-071D350 can be seen below.