The SMC-071D250S from Scientific Microwave Corporation is a Waveguide Coupler with Frequency 2.50 to 7.50 GHz, Coupling 30 dB, 40 dB, 50 dB, 60 dB, Directivity 14 dB. Tags: Double Ridged Coupler, Loop Coupler. More details for SMC-071D250S can be seen below.