Directional 6 dB SMA Coupler From 2 GHz to 18 GHz Rated to 4 Watts RF coupler 215-6 from is one of over 40, 000 RF components available for same day shipping worldwide. This RF coupler is directional and is manufactured with SMA ports. Our directional coupler design uses SMA ports that are female gender and 50 Ohm impedance. The directional coupler design is rated for a minimum frequency of 2 GHz and a maximum frequency of 18 GHz. Directional coupler 2215-6 is constructed with a coupling value of 6 dB and a coupler directivity of 12 dB. This female SMA directional coupler is built with a maximum insertion loss of 2 dB and a maximum input power of 25 watts.