The TDC20-0.5G18S from Transcom is a Directional Coupler with Frequency 500 MHz to 18 GHz, Coupling 20 dB, Coupling Variation ±1.5 dB, Amplitude Flatness ±1.0 dB, Directivity 10 dB. Tags: Module with Connectors. More details for TDC20-0.5G18S can be seen below.