The APTDC-20-00502000-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 0.5 to 20 GHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Frequency Sensitivity ±0.6 to ±1.8 dB, Directivity 11 to 17 dB. Tags: Module with Connectors. More details for APTDC-20-00502000-SMA can be seen below.