The AKC-180400-20 from Atlantic Microwave is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 20 dB, Coupling Variation ± 1 dB, Amplitude Flatness 1 dB, Directivity 10 dB. Tags: Module with Connectors. More details for AKC-180400-20 can be seen below.