The SMC-194D200 from Scientific Microwave Corporation is a Waveguide Coupler with Frequency 2 to 4.80 GHz, Coupling 30 dB, 40 dB, 50 dB, 60 dB, Directivity 20 dB. Tags: Double Ridged Coupler, Broadwall Coupler. More details for SMC-194D200 can be seen below.