The SMC-071D180 from Scientific Microwave Corporation is a Waveguide Coupler with Frequency 18 to 40 GHz, Coupling 30 dB, 40 dB, 50 dB, 60 dB, Directivity 14 dB. Tags: Double Ridged Coupler, Loop Coupler. More details for SMC-071D180 can be seen below.