The APTDC-20-00300800-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 300 to 8000 MHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Frequency Sensitivity ±0.6 to 1.2 dB, Directivity 16 to 25 dB. Tags: Module with Connectors. More details for APTDC-20-00300800-SMA can be seen below.