The ZUDC10-02183-S+ from Mini-Circuits is a directional coupler that operates from 2 to 8 GHz. It has a coupling value of 10 dB, directivity of over 15 dB and an insertion loss of 0.3 dB. The coupler can handle up to 20 watts of power. It is available in a module with SMA female connectors and is ideal for cellular, military and lab testing applications.