The APTDC-20-02001800-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 20 dB, Coupling Variation ±1.0 dB, Frequency Sensitivity ±0.45 to ±1 dB, Directivity 14 to 17 dB. Tags: Module with Connectors. More details for APTDC-20-02001800-SMA can be seen below.