The APTDC-10-00501850-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 5 to 18500 MHz, Coupling 10 dB, Coupling Variation ±1.0 dB, Frequency Sensitivity ±0.5 to ±1.5 dB, Directivity 12 to 16 dB. Tags: Module with Connectors. More details for APTDC-10-00501850-SMA can be seen below.