The A3204-20 from Atlantic Microwave is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 20 dB, Coupling Variation ± 1.25 dB, Frequency Sensitivity ± 0.75 dB, Directivity 22 dB. Tags: Module with Connectors. More details for A3204-20 can be seen below.