RF Coupler – Model C8188 – Uni-Directional Coupler is a Low Power design. The unit operates with 20 dB Coupling, covers the full 30-3000 MHz band rated at 20 W CW. RF Coupler – Model C8188 supports military and commercial applications and operates with less than 2.4 dB of Insertion Loss and better than ± 1.0 dB of Coupling Flatness. The unit is available with a variety of mainline and coupled port connectors. Werlatone Directional Couplers are broadband Dual, Uni, and Bi-Directional. Above all, our high power designs tolerate the most harsh operating conditions associated with military and EMC testing environments.