The APTDC-20-00500200-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 500 to 2000 MHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.50 to ±0.75 dB, Directivity 23 to 26 dB. Tags: Module with Connectors. More details for APTDC-20-00500200-SMA can be seen below.