The APTDC-20-00501850-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 5 to 18500 MHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Frequency Sensitivity ±0.8 to ±1.5 dB, Directivity 11 to 16 dB. Tags: Module with Connectors. More details for APTDC-20-00501850-SMA can be seen below.