The C753-20 from Spectrum Control is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 20 ± 1 dB, Coupling Variation ±1 dB, Amplitude Flatness ± 0.75 dB, Directivity 22 dB. Tags: Module with Connectors. More details for C753-20 can be seen below.