The APTDC-20-02000800-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 2 to 8 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.50 to ±1.25 dB, Directivity 18 dB. Tags: Module with Connectors. More details for APTDC-20-02000800-SMA can be seen below.