The APTDC-30-02001800-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 30 dB, Coupling Variation ±2.5 dB, Frequency Sensitivity ±0.55 to ±1.5 dB, Directivity 11 to 17 dB. Tags: Module with Connectors. More details for APTDC-30-02001800-SMA can be seen below.