Directional 6 dB SMA Coupler From 1 GHz to 4 GHz Rated to 50 Watts RF coupler part number 2200-20 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 500 MHz and a maximum frequency of 1, 000 MHz. Directional coupler 200-20 is constructed with a coupling value of 20 dB and a coupler directivity of 25 dB. This female SMA directional coupler is built with a maximum insertion loss of 0.2 dB and a maximum input power of 50 watts.